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//------------------------------------------------------------------------------
// <copyright file="OleDbDataReader.cs" company="Microsoft">
// Copyright (c) Microsoft Corporation. All rights reserved.
// </copyright>
// <owner current="true" primary="true">Microsoft</owner>
// <owner current="true" primary="false">Microsoft</owner>
//------------------------------------------------------------------------------
namespace System.Data.OleDb {
using System;
using System.Collections;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Data.Common;
using System.Data.ProviderBase;
using System.Diagnostics;
using System.Globalization;
using System.IO;
using System.Runtime.CompilerServices;
using System.Runtime.InteropServices;
using System.Text;
public sealed class OleDbDataReader : DbDataReader {
private CommandBehavior _commandBehavior;
private static int _objectTypeCount; // Bid counter
internal readonly int ObjectID = System.Threading.Interlocked.Increment(ref _objectTypeCount);
// object model interaction
private OleDbConnection _connection;
private OleDbCommand _command;
// DataReader owns the parameter bindings until CloseDataReader
// this allows OleDbCommand.Dispose to not require OleDbDataReader.Dispose
private Bindings _parameterBindings;
// OLEDB interfaces
private UnsafeNativeMethods.IMultipleResults _imultipleResults;
private UnsafeNativeMethods.IRowset _irowset;
private UnsafeNativeMethods.IRow _irow;
private ChapterHandle _chapterHandle = ChapterHandle.DB_NULL_HCHAPTER;
private int _depth;
private bool _isClosed, _isRead, _hasRows, _hasRowsReadCheck;
long _sequentialBytesRead;
int _sequentialOrdinal;
private Bindings[] _bindings; // _metdata contains the ColumnBinding
// do we need to jump to the next accessor
private int _nextAccessorForRetrieval;
// must increment the counter before retrieving value so that
// if an exception is thrown, user can continue without erroring again
private int _nextValueForRetrieval;
// record affected for the current dataset
private IntPtr _recordsAffected = ADP.RecordsUnaffected;
private bool _useIColumnsRowset;
private bool _sequentialAccess;
private bool _singleRow;
// cached information for Reading (rowhandles/status)
private IntPtr _rowHandleFetchCount; // MDAC 60111 (>1 fails against jet)
private RowHandleBuffer _rowHandleNativeBuffer;
private IntPtr _rowFetchedCount;
private int _currentRow;
private DataTable _dbSchemaTable;
private int _visibleFieldCount;
private MetaData[] _metadata;
private FieldNameLookup _fieldNameLookup;
// ctor for an ICommandText, IMultipleResults, IRowset, IRow
// ctor for an ADODB.Recordset, ADODB.Record or Hierarchial resultset
internal OleDbDataReader(OleDbConnection connection, OleDbCommand command, int depth, CommandBehavior commandBehavior) {
OleDbConnection.VerifyExecutePermission();
_connection = connection;
_command = command;
_commandBehavior = commandBehavior;
if ((null != command) && (0 == _depth)) {
_parameterBindings = command.TakeBindingOwnerShip();
}
_depth = depth;
}
private void Initialize() {
CommandBehavior behavior = _commandBehavior;
_useIColumnsRowset = (0 != (CommandBehavior.KeyInfo & behavior));
_sequentialAccess = (0 != (CommandBehavior.SequentialAccess & behavior)); // MDAC 60296
if (0 == _depth) { // MDAC 70886
_singleRow = (0 != (CommandBehavior.SingleRow & behavior));
}
}
internal void InitializeIMultipleResults(object result) {
Initialize();
_imultipleResults = (UnsafeNativeMethods.IMultipleResults) result; // maybe null if no results
}
internal void InitializeIRowset(object result, ChapterHandle chapterHandle, IntPtr recordsAffected) {
// if from ADODB, connection will be null
if ((null == _connection) || (ChapterHandle.DB_NULL_HCHAPTER != chapterHandle)) { // MDAC 59629
_rowHandleFetchCount = new IntPtr(1);
}
Initialize();
_recordsAffected = recordsAffected;
_irowset = (UnsafeNativeMethods.IRowset) result; // maybe null if no results
_chapterHandle = chapterHandle;
}
internal void InitializeIRow(object result, IntPtr recordsAffected) {
Initialize();
Debug.Assert(_singleRow, "SingleRow not already set");
_singleRow = true;
_recordsAffected = recordsAffected;
_irow = (UnsafeNativeMethods.IRow) result; // maybe null if no results
_hasRows = (null != _irow);
}
internal OleDbCommand Command {
get {
return _command;
}
}
override public int Depth {
get {
Bid.Trace("<oledb.OleDbDataReader.get_Depth|API> %d#\n", ObjectID);
if (IsClosed) { // MDAC 63669
throw ADP.DataReaderClosed("Depth");
}
return _depth;
}
}
override public Int32 FieldCount {
get {
Bid.Trace("<oledb.OleDbDataReader.get_FieldCount|API> %d#\n", ObjectID);
if (IsClosed) { // MDAC 63669
throw ADP.DataReaderClosed("FieldCount");
}
MetaData[] metadata = MetaData;
return ((null != metadata) ? metadata.Length : 0);
}
}
override public bool HasRows { // MDAC 78405
get {
Bid.Trace("<oledb.OleDbDataReader.get_HasRows|API> %d#\n", ObjectID);
if (IsClosed) { // MDAC 63669
throw ADP.DataReaderClosed("HasRows");
}
return _hasRows;
}
}
override public Boolean IsClosed {
get { // if we have a rowset or multipleresults, we may have more to read
Bid.Trace("<oledb.OleDbDataReader.get_IsClosed|API> %d#\n", ObjectID);
Debug.Assert((_singleRow && !_isClosed && !_isRead && (null == _irow) && (null == _irowset)) ||
_isClosed == ((null == _irow) && (null == _irowset) && (null == _imultipleResults)
&& (null == _dbSchemaTable) && (null == _connection) && (null == _command)), // MDAC 59536
"IsClosed mismatch");
return _isClosed;
}
}
private MetaData[] MetaData {
get { return _metadata; }
}
override public int RecordsAffected {
get {
Bid.Trace("<oledb.OleDbDataReader.get_RecordsAffected|API> %d#\n", ObjectID);
return ADP.IntPtrToInt32(_recordsAffected);
}
}
/*
internal long RecordsAffectedLong {
get {
return (long)_recordsAffected;
}
}*/
override public object this[Int32 index] {
get {
return GetValue(index);
}
}
override public object this[String name] {
get {
int ordinal = GetOrdinal(name);
return GetValue(ordinal);
}
}
// grouping the native OLE DB casts togther by required interfaces and optional interfaces
// want these to be methods, not properties otherwise they appear in VS7 managed debugger which attempts to evaluate them
// required interface, safe cast
private UnsafeNativeMethods.IAccessor IAccessor() {
Bid.Trace("<oledb.IUnknown.QueryInterface|API|OLEDB|rowset> %d#, IAccessor\n", ObjectID);
return (UnsafeNativeMethods.IAccessor) IRowset();
}
// required interface, safe cast
private UnsafeNativeMethods.IRowsetInfo IRowsetInfo() {
Bid.Trace("<oledb.IUnknown.QueryInterface|API|OLEDB|rowset> %d#, IRowsetInfo\n", ObjectID);
return (UnsafeNativeMethods.IRowsetInfo) IRowset();
}
private UnsafeNativeMethods.IRowset IRowset() {
UnsafeNativeMethods.IRowset irowset = _irowset;
if (null == irowset) {
Debug.Assert(false, "object is disposed");
throw new ObjectDisposedException(GetType().Name);
}
return irowset;
}
private UnsafeNativeMethods.IRow IRow() {
UnsafeNativeMethods.IRow irow = _irow;
if (null == irow) {
Debug.Assert(false, "object is disposed");
throw new ObjectDisposedException(GetType().Name);
}
return irow;
}
override public DataTable GetSchemaTable() {
IntPtr hscp;
Bid.ScopeEnter(out hscp, "<oledb.OleDbDataReader.GetSchemaTable|API> %d#\n", ObjectID);
try {
DataTable schemaTable = _dbSchemaTable;
if (null == schemaTable) {
MetaData[] metadata = MetaData;
if ((null != metadata) && (0 < metadata.Length)) {
if ((0 < metadata.Length) && _useIColumnsRowset && (null != _connection)) {
AppendSchemaInfo();
}
schemaTable = BuildSchemaTable(metadata);
}
else if (IsClosed) { // MDAC 68331
throw ADP.DataReaderClosed("GetSchemaTable");
}
//GetSchemaTable() is defined to return null after NextResult returns false
//throw ADP.DataReaderNoData();
}
return schemaTable;
}
finally {
Bid.ScopeLeave(ref hscp);
}
}
internal void BuildMetaInfo() {
Debug.Assert(null == _metadata, "BuildMetaInfo: already built, by _metadata");
if (null != _irowset) {
if (_useIColumnsRowset) {
BuildSchemaTableRowset(_irowset);
}
else {
BuildSchemaTableInfo(_irowset, false, false);
}
if (null != _metadata && 0 < _metadata.Length) {
// @devnote: because we want to use the DBACCESSOR_OPTIMIZED bit,
// we are required to create the accessor before fetching any rows
CreateAccessors(true);
Debug.Assert(null != _bindings, "unexpected dbBindings");
}
}
else if (null != _irow) {
BuildSchemaTableInfo(_irow, false, false);
if (null != _metadata && 0 < _metadata.Length) {
CreateBindingsFromMetaData(true);
}
}
if (null == _metadata) {
_hasRows = false;
_visibleFieldCount = 0;
_metadata = new MetaData[0];
}
}
private DataTable BuildSchemaTable(MetaData[] metadata) {
Debug.Assert(null == _dbSchemaTable, "BuildSchemaTable: schema table already exists");
Debug.Assert(null != metadata, "BuildSchemaTable: no _metadata");
DataTable schemaTable = new DataTable("SchemaTable");
schemaTable.Locale = CultureInfo.InvariantCulture;
schemaTable.MinimumCapacity = metadata.Length;
DataColumn name = new DataColumn("ColumnName", typeof(System.String));
DataColumn ordinal = new DataColumn("ColumnOrdinal", typeof(System.Int32));
DataColumn size = new DataColumn("ColumnSize", typeof(System.Int32));
DataColumn precision = new DataColumn("NumericPrecision", typeof(System.Int16));
DataColumn scale = new DataColumn("NumericScale", typeof(System.Int16));
DataColumn dataType = new DataColumn("DataType", typeof(System.Type));
DataColumn providerType = new DataColumn("ProviderType", typeof(System.Int32));
DataColumn isLong = new DataColumn("IsLong", typeof(System.Boolean));
DataColumn allowDBNull = new DataColumn("AllowDBNull", typeof(System.Boolean));
DataColumn isReadOnly = new DataColumn("IsReadOnly", typeof(System.Boolean));
DataColumn isRowVersion = new DataColumn("IsRowVersion", typeof(System.Boolean));
DataColumn isUnique = new DataColumn("IsUnique", typeof(System.Boolean));
DataColumn isKey = new DataColumn("IsKey", typeof(System.Boolean));
DataColumn isAutoIncrement = new DataColumn("IsAutoIncrement", typeof(System.Boolean));
DataColumn isHidden = new DataColumn("IsHidden", typeof(System.Boolean));
DataColumn baseSchemaName = new DataColumn("BaseSchemaName", typeof(System.String));
DataColumn baseCatalogName = new DataColumn("BaseCatalogName", typeof(System.String));
DataColumn baseTableName = new DataColumn("BaseTableName", typeof(System.String));
DataColumn baseColumnName = new DataColumn("BaseColumnName", typeof(System.String));
ordinal.DefaultValue = 0;
isLong.DefaultValue = false;
DataColumnCollection columns = schemaTable.Columns;
columns.Add(name);
columns.Add(ordinal);
columns.Add(size);
columns.Add(precision);
columns.Add(scale);
columns.Add(dataType);
columns.Add(providerType);
columns.Add(isLong);
columns.Add(allowDBNull);
columns.Add(isReadOnly);
columns.Add(isRowVersion);
columns.Add(isUnique);
columns.Add(isKey);
columns.Add(isAutoIncrement);
if (_visibleFieldCount < metadata.Length) {
columns.Add(isHidden);
}
columns.Add(baseSchemaName);
columns.Add(baseCatalogName);
columns.Add(baseTableName);
columns.Add(baseColumnName);
for (int i = 0; i < metadata.Length; ++i) {
MetaData info = metadata[i];
DataRow newRow = schemaTable.NewRow();
newRow[name] = info.columnName;
newRow[ordinal] = i; // MDAC 68319
// @devnote: size is count of characters for WSTR or STR, bytes otherwise
// @devnote: see OLEDB spec under IColumnsInfo::GetColumnInfo
newRow[size] = ((info.type.enumOleDbType != OleDbType.BSTR) ? info.size : -1); // MDAC 72653
newRow[precision] = info.precision; // MDAC 72800
newRow[scale] = info.scale;
newRow[dataType] = info.type.dataType;
newRow[providerType] = info.type.enumOleDbType;
newRow[isLong] = OleDbDataReader.IsLong(info.flags);
if (info.isKeyColumn) {
newRow[allowDBNull] = OleDbDataReader.AllowDBNull(info.flags);
}
else {
newRow[allowDBNull] = OleDbDataReader.AllowDBNullMaybeNull(info.flags);
}
newRow[isReadOnly] = OleDbDataReader.IsReadOnly(info.flags);
newRow[isRowVersion] = OleDbDataReader.IsRowVersion(info.flags);
newRow[isUnique] = info.isUnique;
newRow[isKey] = info.isKeyColumn;
newRow[isAutoIncrement] = info.isAutoIncrement;
if (_visibleFieldCount < metadata.Length) {
newRow[isHidden] = info.isHidden;
}
if (null != info.baseSchemaName) {
newRow[baseSchemaName] = info.baseSchemaName;
}
if (null != info.baseCatalogName) {
newRow[baseCatalogName] = info.baseCatalogName;
}
if (null != info.baseTableName) {
newRow[baseTableName] = info.baseTableName;
}
if (null != info.baseColumnName) {
newRow[baseColumnName] = info.baseColumnName;
}
schemaTable.Rows.Add(newRow);
newRow.AcceptChanges();
}
// mark all columns as readonly
int count = columns.Count;
for (int i=0; i < count; i++) {
columns[i].ReadOnly = true; // MDAC 70943
}
_dbSchemaTable = schemaTable;
return schemaTable;
}
private void BuildSchemaTableInfo(object handle, bool filterITypeInfo, bool filterChapters) {
Debug.Assert(null == _dbSchemaTable, "non-null SchemaTable");
Debug.Assert(null == _metadata, "non-null metadata");
Debug.Assert(null != handle, "unexpected null rowset");
Bid.Trace("<oledb.IUnknown.QueryInterface|API|OLEDB|rowset_row> %d#, IColumnsInfo\n", ObjectID);
UnsafeNativeMethods.IColumnsInfo icolumnsInfo = (handle as UnsafeNativeMethods.IColumnsInfo);
if (null == icolumnsInfo) {
Bid.Trace("<oledb.IUnknown.QueryInterface|API|OLEDB|RET> %08X{HRESULT}\n", OleDbHResult.E_NOINTERFACE);
_dbSchemaTable = null;
#if DEBUG
if (handle is UnsafeNativeMethods.IRow) {
Debug.Assert(false, "bad IRow - IColumnsInfo not available");
}
else {
Debug.Assert(handle is UnsafeNativeMethods.IRowset, "bad IRowset - IColumnsInfo not available");
}
#endif
return;
}
OleDbHResult hr;
IntPtr columnCount = ADP.PtrZero; // column count
IntPtr columnInfos = ADP.PtrZero; // ptr to byvalue tagDBCOLUMNINFO[]
using(DualCoTaskMem safehandle = new DualCoTaskMem(icolumnsInfo, out columnCount, out columnInfos, out hr)) {
if (hr < 0) {
ProcessResults(hr);
}
if (0 < (int)columnCount) {
BuildSchemaTableInfoTable(columnCount.ToInt32(), columnInfos, filterITypeInfo, filterChapters);
}
}
}
// create DataColumns
// add DataColumns to DataTable
// add schema information to DataTable
// generate unique column names
private void BuildSchemaTableInfoTable(int columnCount, IntPtr columnInfos, bool filterITypeInfo, bool filterChapters) {
Debug.Assert(0 < columnCount, "BuildSchemaTableInfoTable - no column");
int rowCount = 0;
MetaData[] metainfo = new MetaData[columnCount];
// for every column, build an equivalent to tagDBCOLUMNINFO
tagDBCOLUMNINFO dbColumnInfo = new tagDBCOLUMNINFO();
for (int i = 0, offset = 0; i < columnCount; ++i, offset += ODB.SizeOf_tagDBCOLUMNINFO) {
Marshal.PtrToStructure(ADP.IntPtrOffset(columnInfos, offset), dbColumnInfo);
#if WIN32
if (0 >= (int) dbColumnInfo.iOrdinal) {
#else
if (0 >= (long) dbColumnInfo.iOrdinal) {
#endif
continue;
}
if (OleDbDataReader.DoColumnDropFilter(dbColumnInfo.dwFlags)) {
continue;
}
if (null == dbColumnInfo.pwszName) {
dbColumnInfo.pwszName = "";
}
if (filterITypeInfo && (ODB.DBCOLUMN_TYPEINFO == dbColumnInfo.pwszName)) { // MDAC 65306
continue;
}
if (filterChapters && (NativeDBType.HCHAPTER == dbColumnInfo.wType)) {
continue; // filter chapters in IRowset from IDBSchemaRowset for DumpToTable
}
bool islong = OleDbDataReader.IsLong(dbColumnInfo.dwFlags);
bool isfixed = OleDbDataReader.IsFixed(dbColumnInfo.dwFlags);
NativeDBType dbType = NativeDBType.FromDBType(dbColumnInfo.wType, islong, isfixed);
MetaData info = new MetaData();
info.columnName = dbColumnInfo.pwszName;
info.type = dbType;
info.ordinal = dbColumnInfo.iOrdinal;
#if WIN32
info.size = (int)dbColumnInfo.ulColumnSize;
#else
long maxsize = (long) dbColumnInfo.ulColumnSize;
info.size = (((maxsize < 0) || (Int32.MaxValue < maxsize)) ? Int32.MaxValue : (int)maxsize);
#endif
info.flags = dbColumnInfo.dwFlags;
info.precision = dbColumnInfo.bPrecision;
info.scale = dbColumnInfo.bScale;
info.kind = dbColumnInfo.columnid.eKind;
switch(dbColumnInfo.columnid.eKind) {
case ODB.DBKIND_GUID_NAME:
case ODB.DBKIND_GUID_PROPID:
case ODB.DBKIND_GUID:
info.guid = dbColumnInfo.columnid.uGuid;
break;
default:
Debug.Assert(ODB.DBKIND_PGUID_NAME != dbColumnInfo.columnid.eKind, "OLE DB providers never return pGuid-style bindings.");
Debug.Assert(ODB.DBKIND_PGUID_PROPID != dbColumnInfo.columnid.eKind, "OLE DB providers never return pGuid-style bindings.");
info.guid = Guid.Empty;
break;
}
switch(dbColumnInfo.columnid.eKind) {
case ODB.DBKIND_GUID_PROPID:
case ODB.DBKIND_PROPID:
info.propid = dbColumnInfo.columnid.ulPropid;
break;
case ODB.DBKIND_GUID_NAME:
case ODB.DBKIND_NAME:
if (ADP.PtrZero != dbColumnInfo.columnid.ulPropid) {
info.idname = Marshal.PtrToStringUni(dbColumnInfo.columnid.ulPropid);
}
else {
info.idname = null;
}
break;
default:
info.propid = ADP.PtrZero;
break;
}
metainfo[rowCount] = info;
#if DEBUG
if (AdapterSwitches.DataSchema.TraceVerbose) {
Debug.WriteLine("OleDbDataReader[" + info.ordinal.ToInt64().ToString(CultureInfo.InvariantCulture) + ", " + dbColumnInfo.pwszName + "]=" + dbType.enumOleDbType.ToString() + "," + dbType.dataSourceType + ", " + dbType.wType);
}
#endif
rowCount++;
}
if (rowCount < columnCount) { // shorten names array appropriately
MetaData[] tmpinfo = new MetaData[rowCount];
for (int i = 0; i < rowCount; ++i) {
tmpinfo[i] = metainfo[i];
}
metainfo = tmpinfo;
}
_visibleFieldCount = rowCount;
_metadata = metainfo;
}
private void BuildSchemaTableRowset(object handle) {
Debug.Assert(null == _dbSchemaTable, "BuildSchemaTableRowset - non-null SchemaTable");
Debug.Assert(null != handle, "BuildSchemaTableRowset(object) - unexpected null handle");
Bid.Trace("<oledb.IUnknown.QueryInterface|API|OLEDB|rowset_row> %d, IColumnsRowset\n", ObjectID);
UnsafeNativeMethods.IColumnsRowset icolumnsRowset = (handle as UnsafeNativeMethods.IColumnsRowset);
if (null != icolumnsRowset) {
UnsafeNativeMethods.IRowset rowset = null;
IntPtr cOptColumns;
OleDbHResult hr;
using(DualCoTaskMem prgOptColumns = new DualCoTaskMem(icolumnsRowset, out cOptColumns, out hr)) {
Debug.Assert((0 == hr) || prgOptColumns.IsInvalid, "GetAvailableCOlumns: unexpected return");
Bid.Trace("<oledb.IColumnsRowset.GetColumnsRowset|API|OLEDB> %d#, IID_IRowset\n", ObjectID);
hr = icolumnsRowset.GetColumnsRowset(ADP.PtrZero, cOptColumns, prgOptColumns, ref ODB.IID_IRowset, 0, ADP.PtrZero, out rowset);
Bid.Trace("<oledb.IColumnsRowset.GetColumnsRowset|API|OLEDB|RET> %08X{HRESULT}\n", hr);
}
Debug.Assert((0 <= hr) || (null == rowset), "if GetColumnsRowset failed, rowset should be null");
if (hr < 0) {
ProcessResults(hr);
}
DumpToSchemaTable(rowset);
// VSTFDEVDIV 479576: release the rowset to avoid race condition between the GC and the user code causing
// "Connection is busy with results for another command" exception
if (null != rowset) {
Marshal.ReleaseComObject(rowset);
}
}
else {
Bid.Trace("<oledb.IUnknown.QueryInterface|API|OLEDB|RET> %08X{HRESULT}\n", OleDbHResult.E_NOINTERFACE);
_useIColumnsRowset = false; // MDAC 72653
BuildSchemaTableInfo(handle, false, false);
}
}
override public void Close() {
IntPtr hscp;
Bid.ScopeEnter(out hscp, "<oledb.OleDbDataReader.Close|API> %d#\n", ObjectID);
try {
OleDbConnection con = _connection;
OleDbCommand cmd = _command;
Bindings bindings = _parameterBindings;
_connection = null;
_command = null;
_parameterBindings = null;
_isClosed = true;
DisposeOpenResults();
_hasRows = false;
if ((null != cmd) && cmd.canceling) { // MDAC 68964
DisposeNativeMultipleResults();
if (null != bindings) {
bindings.CloseFromConnection();
bindings = null;
}
}
else {
UnsafeNativeMethods.IMultipleResults multipleResults = _imultipleResults;
_imultipleResults = null;
if (null != multipleResults) {
// if we don't have a cmd, same as a cancel (don't call NextResults) which is ADODB behavior
try {
// tricky code path is an exception is thrown
// causing connection to do a ResetState and connection.Close
// resulting in OleDbCommand.CloseFromConnection
if ((null != cmd) && !cmd.canceling) { // MDAC 71435
IntPtr affected = IntPtr.Zero;
OleDbException nextResultsFailure = NextResults(multipleResults, null, cmd, out affected);
_recordsAffected = AddRecordsAffected(_recordsAffected, affected);
if (null != nextResultsFailure) {
throw nextResultsFailure;
}
}
}
finally {
if (null != multipleResults) {
Marshal.ReleaseComObject(multipleResults);
}
}
}
}
if ((null != cmd) && (0 == _depth)) {
// return bindings back to the cmd after closure of root DataReader
cmd.CloseFromDataReader(bindings); // MDAC 52283
}
if (null != con) {
con.RemoveWeakReference(this);
// if the DataReader is Finalized it will not close the connection
if (IsCommandBehavior(CommandBehavior.CloseConnection)) {
con.Close();
}
}
// release unmanaged objects
RowHandleBuffer rowHandleNativeBuffer = _rowHandleNativeBuffer;
_rowHandleNativeBuffer = null;
if (null != rowHandleNativeBuffer) {
rowHandleNativeBuffer.Dispose();
}
}
finally {
Bid.ScopeLeave(ref hscp);
}
}
internal void CloseReaderFromConnection(bool canceling) {
// being called from the connection, we will have a command. that command
// may be Disposed, but it doesn't matter since another command can't execute
// until all DataReader are closed
if (null != _command) { //
_command.canceling = canceling;
}
// called from the connection which will remove this from its ReferenceCollection
// we want the NextResult behavior, but no errors
_connection = null;
Close();
}
private void DisposeManagedRowset() {
//not cleared after last rowset
//_hasRows = false;
_isRead = false;
_hasRowsReadCheck = false;
_nextAccessorForRetrieval = 0;
_nextValueForRetrieval = 0;
Bindings[] bindings = _bindings;
_bindings = null;
if (null != bindings) {
for (int i = 0; i < bindings.Length; ++i) {
if (null != bindings[i]) { // MDAC 77007
bindings[i].Dispose();
}
}
}
_currentRow = 0;
_rowFetchedCount = IntPtr.Zero;
_dbSchemaTable = null;
_visibleFieldCount = 0;
_metadata = null;
_fieldNameLookup = null;
}
private void DisposeNativeMultipleResults() {
UnsafeNativeMethods.IMultipleResults imultipleResults = _imultipleResults;
_imultipleResults = null;
if (null != imultipleResults) {
Marshal.ReleaseComObject(imultipleResults);
}
}
private void DisposeNativeRowset() {
UnsafeNativeMethods.IRowset irowset = _irowset;
_irowset = null;
ChapterHandle chapter = _chapterHandle;
_chapterHandle = ChapterHandle.DB_NULL_HCHAPTER;
if (ChapterHandle.DB_NULL_HCHAPTER != chapter) { // MDAC 81441
chapter.Dispose();
}
if (null != irowset) {
Marshal.ReleaseComObject(irowset);
}
}
private void DisposeNativeRow() {
UnsafeNativeMethods.IRow irow = _irow;
_irow = null;
if (null != irow) {
Marshal.ReleaseComObject(irow);
}
}
private void DisposeOpenResults() {
DisposeManagedRowset();
DisposeNativeRow();
DisposeNativeRowset();
}
override public Boolean GetBoolean(int ordinal) {
ColumnBinding binding = GetColumnBinding(ordinal);
return binding.ValueBoolean();
}
override public Byte GetByte(int ordinal) {
ColumnBinding binding = GetColumnBinding(ordinal);
return binding.ValueByte();
}
private ColumnBinding DoSequentialCheck(int ordinal, Int64 dataIndex, string method) {
ColumnBinding binding = GetColumnBinding(ordinal);
if (dataIndex > Int32.MaxValue) {
throw ADP.InvalidSourceBufferIndex(0, dataIndex, "dataIndex");
}
if (_sequentialOrdinal != ordinal) {
_sequentialOrdinal = ordinal;
_sequentialBytesRead = 0;
}
else if (_sequentialAccess && (_sequentialBytesRead < dataIndex)) {
throw ADP.NonSeqByteAccess(dataIndex, _sequentialBytesRead, method);
}
// getting the value doesn't really belong, but it's common to both
// callers GetBytes and GetChars so we might as well have the code here
return binding;
}
override public Int64 GetBytes(int ordinal, Int64 dataIndex, byte[] buffer, Int32 bufferIndex, Int32 length) {
ColumnBinding binding = DoSequentialCheck(ordinal, dataIndex, ADP.GetBytes);
byte[] value = binding.ValueByteArray();
if (null == buffer) {
return value.Length;
}
int srcIndex = (int) dataIndex;
int byteCount = Math.Min(value.Length - srcIndex, length);
if (srcIndex < 0) { // MDAC 72830
throw ADP.InvalidSourceBufferIndex(value.Length, srcIndex, "dataIndex");
}
else if ((bufferIndex < 0) || (bufferIndex >= buffer.Length)) { // MDAC 71013
throw ADP.InvalidDestinationBufferIndex(buffer.Length, bufferIndex, "bufferIndex");
}
if (0 < byteCount) {
// @usernote: user may encounter ArgumentException from Buffer.BlockCopy
Buffer.BlockCopy(value, srcIndex, buffer, bufferIndex, byteCount);
_sequentialBytesRead = srcIndex + byteCount; // MDAC 71013
}
else if (length < 0) { // MDAC 71007
throw ADP.InvalidDataLength(length);
}
else {
byteCount = 0;
}
return byteCount;
}
override public Int64 GetChars(int ordinal, Int64 dataIndex, char[] buffer, Int32 bufferIndex, Int32 length) {
ColumnBinding binding = DoSequentialCheck(ordinal, dataIndex, ADP.GetChars);
string value = binding.ValueString();
if (null == buffer) {
return value.Length;
}
int srcIndex = (int) dataIndex;
int charCount = Math.Min(value.Length - srcIndex, length);
if (srcIndex < 0) { // MDAC 72830
throw ADP.InvalidSourceBufferIndex(value.Length, srcIndex, "dataIndex");
}
else if ((bufferIndex < 0) || (bufferIndex >= buffer.Length)) { // MDAC 71013
throw ADP.InvalidDestinationBufferIndex(buffer.Length, bufferIndex, "bufferIndex");
}
if (0 < charCount) {
// @usernote: user may encounter ArgumentException from String.CopyTo
value.CopyTo(srcIndex, buffer, bufferIndex, charCount);
_sequentialBytesRead = srcIndex + charCount; // MDAC 71013
}
else if (length < 0) { // MDAC 71007
throw ADP.InvalidDataLength(length);
}
else {
charCount = 0;
}
return charCount;
}
[ EditorBrowsableAttribute(EditorBrowsableState.Never) ] // MDAC 69508
override public Char GetChar(int ordinal) {
throw ADP.NotSupported();
}
[ EditorBrowsableAttribute(EditorBrowsableState.Advanced) ]
new public OleDbDataReader GetData(int ordinal) {
ColumnBinding binding = GetColumnBinding(ordinal);
return binding.ValueChapter();
}
override protected DbDataReader GetDbDataReader(int ordinal) {
return GetData(ordinal);
}
internal OleDbDataReader ResetChapter(int bindingIndex, int index, RowBinding rowbinding, int valueOffset) {
return GetDataForReader(_metadata[bindingIndex + index].ordinal, rowbinding, valueOffset);
}
private OleDbDataReader GetDataForReader(IntPtr ordinal, RowBinding rowbinding, int valueOffset) {
UnsafeNativeMethods.IRowsetInfo rowsetInfo = IRowsetInfo();
UnsafeNativeMethods.IRowset result;
OleDbHResult hr;
Bid.Trace("<oledb.IRowsetInfo.GetReferencedRowset|API|OLEDB> %d#, ColumnOrdinal=%Id\n", ObjectID, ordinal);
hr = rowsetInfo.GetReferencedRowset((IntPtr)ordinal, ref ODB.IID_IRowset, out result);
Bid.Trace("<oledb.IRowsetInfo.GetReferencedRowset|API|OLEDB|RET> %08X{HRESULT}\n", hr);
ProcessResults(hr);
OleDbDataReader reader = null;
if (null != result) {
// only when the first datareader is closed will the connection close
ChapterHandle chapterHandle = ChapterHandle.CreateChapterHandle(result, rowbinding, valueOffset);
reader = new OleDbDataReader(_connection, _command, 1+Depth, _commandBehavior & ~CommandBehavior.CloseConnection);
reader.InitializeIRowset(result, chapterHandle, ADP.RecordsUnaffected);
reader.BuildMetaInfo();
reader.HasRowsRead();
if (null != _connection) {
// connection tracks all readers to prevent cmd from executing
// until all readers (including nested) are closed
_connection.AddWeakReference(reader, OleDbReferenceCollection.DataReaderTag);
}
}
return reader;
}
override public String GetDataTypeName(int index) {
if (null != _metadata) {
return _metadata[index].type.dataSourceType;
}
throw ADP.DataReaderNoData();
}
override public DateTime GetDateTime(int ordinal) {
ColumnBinding binding = GetColumnBinding(ordinal);
return binding.ValueDateTime();
}
override public Decimal GetDecimal(int ordinal) {
ColumnBinding binding = GetColumnBinding(ordinal);
return binding.ValueDecimal();
}
override public Double GetDouble(int ordinal) {
ColumnBinding binding = GetColumnBinding(ordinal);
return binding.ValueDouble();
}
override public IEnumerator GetEnumerator() {
return new DbEnumerator((IDataReader)this, IsCommandBehavior(CommandBehavior.CloseConnection));
}
override public Type GetFieldType(int index) {
if (null != _metadata) {
return _metadata[index].type.dataType;
}
throw ADP.DataReaderNoData();
}
override public Single GetFloat(int ordinal) {
ColumnBinding binding = GetColumnBinding(ordinal);
return binding.ValueSingle();
}
override public Guid GetGuid(int ordinal) {
ColumnBinding binding = GetColumnBinding(ordinal);
return binding.ValueGuid();
}
override public Int16 GetInt16(int ordinal) {
ColumnBinding binding = GetColumnBinding(ordinal);
return binding.ValueInt16();
}
override public Int32 GetInt32(int ordinal) {
ColumnBinding binding = GetColumnBinding(ordinal);
return binding.ValueInt32();
}
override public Int64 GetInt64(int ordinal) {
ColumnBinding binding = GetColumnBinding(ordinal);
return binding.ValueInt64();
}
override public String GetName(int index) {
if (null != _metadata) {
Debug.Assert(null != _metadata[index].columnName, "MDAC 66681");
return _metadata[index].columnName;
}
throw ADP.DataReaderNoData();
}
override public Int32 GetOrdinal(String name) {
if (null == _fieldNameLookup) {
if (null == _metadata) {
throw ADP.DataReaderNoData();
}
_fieldNameLookup = new FieldNameLookup(this, -1);
}
return _fieldNameLookup.GetOrdinal(name); // MDAC 71470
}
override public String GetString(int ordinal) {
ColumnBinding binding = GetColumnBinding(ordinal);
return binding.ValueString();
}
public TimeSpan GetTimeSpan(int ordinal) {
return (TimeSpan) GetValue(ordinal);
}
private MetaData DoValueCheck(int ordinal) {
if (!_isRead) {
// Read hasn't been called yet or no more data
throw ADP.DataReaderNoData();
}
else if (_sequentialAccess && (ordinal < _nextValueForRetrieval)) {
throw ADP.NonSequentialColumnAccess(ordinal, _nextValueForRetrieval);
}
// @usernote: user may encounter the IndexOutOfRangeException
MetaData info = _metadata[ordinal];
return info;
}
private ColumnBinding GetColumnBinding(int ordinal) {
MetaData info = DoValueCheck(ordinal);
return GetValueBinding(info);
}
private ColumnBinding GetValueBinding(MetaData info) {
ColumnBinding binding = info.columnBinding;
Debug.Assert(null != binding, "null binding");
// do we need to jump to the next accessor
for (int i = _nextAccessorForRetrieval; i <= binding.IndexForAccessor; ++i) {
Debug.Assert(_nextAccessorForRetrieval <= binding.IndexForAccessor, "backwards index for accessor");
Debug.Assert(_nextAccessorForRetrieval == i, "failed to increment");
if (_sequentialAccess) {
if (_nextValueForRetrieval != binding.Index) { // release old value
_metadata[_nextValueForRetrieval].columnBinding.ResetValue();
}
_nextAccessorForRetrieval = binding.IndexForAccessor;
}
if (null != _irowset) {
GetRowDataFromHandle(); // will increment _nextAccessorForRetrieval
}
else if (null != _irow) {
GetRowValue(); // will increment _nextAccessorForRetrieval
}
else {
throw ADP.DataReaderNoData();
}
}
// to enforce sequential access
_nextValueForRetrieval = binding.Index;
return binding;
}
override public object GetValue(int ordinal) {
ColumnBinding binding = GetColumnBinding(ordinal);
object value = binding.Value();
return value;
}
override public Int32 GetValues(object[] values) {
if (null == values) {
throw ADP.ArgumentNull("values");
}
MetaData info = DoValueCheck(0);
int count = Math.Min(values.Length, _visibleFieldCount);
for (int i = 0; (i < _metadata.Length) && (i < count); ++i) {
ColumnBinding binding = GetValueBinding(_metadata[i]);
values[i] = binding.Value();
}
return count;
}
private bool IsCommandBehavior(CommandBehavior condition) {
return (condition == (condition & _commandBehavior));
}
override public Boolean IsDBNull(int ordinal) {
ColumnBinding binding = GetColumnBinding(ordinal);
return binding.IsValueNull();
}
private void ProcessResults(OleDbHResult hr) {
Exception e;
if (null != _command) {
e = OleDbConnection.ProcessResults(hr, _connection, _command);
}
else {
e = OleDbConnection.ProcessResults(hr, _connection, _connection);
}
if (null != e) { throw e; }
}
static private IntPtr AddRecordsAffected(IntPtr recordsAffected, IntPtr affected) { // MDAC 65374
#if WIN32
if (0 <= (int)affected) {
if (0 <= (int)recordsAffected) {
return (IntPtr)((int)recordsAffected + (int)affected);
#else
if (0 <= (long)affected) {
if (0 <= (long)recordsAffected) {
return (IntPtr)((long)recordsAffected + (long)affected);
#endif
}
return affected;
}
return recordsAffected;
}
override public int VisibleFieldCount {
get {
Bid.Trace("<oledb.OleDbDataReader.get_VisibleFieldCount|API> %d#\n", ObjectID);
if (IsClosed) {
throw ADP.DataReaderClosed("VisibleFieldCount");
}
return _visibleFieldCount;
}
}
internal void HasRowsRead() { // MDAC 78405
Debug.Assert(!_hasRowsReadCheck, "_hasRowsReadCheck not reset");
bool flag = Read();
_hasRows = flag;
_hasRowsReadCheck = true;
_isRead = false;
}
static internal OleDbException NextResults(UnsafeNativeMethods.IMultipleResults imultipleResults, OleDbConnection connection, OleDbCommand command, out IntPtr recordsAffected) {
recordsAffected = ADP.RecordsUnaffected;
List<OleDbException> exceptions = null; // WebData 104564
if (null != imultipleResults) {
object result;
IntPtr affected;
OleDbHResult hr;
// MSOLAP provider doesn't move onto the next result when calling GetResult with IID_NULL, but does return S_OK with 0 affected records.
// we want to break out of that infinite loop for ExecuteNonQuery and the multiple result Close scenarios
for (int loop = 0;; ++loop) {
if ((null != command) && command.canceling) { // MDAC 68964
break;
}
Bid.Trace("<oledb.IMultipleResults.GetResult|API|OLEDB> DBRESULTFLAG_DEFAULT, IID_NULL\n");
hr = imultipleResults.GetResult(ADP.PtrZero, ODB.DBRESULTFLAG_DEFAULT, ref ODB.IID_NULL, out affected, out result);
Bid.Trace("<oledb.IMultipleResults.GetResult|API|OLEDB|RET> %08X{HRESULT}, RecordAffected=%Id\n", hr, affected);
// If a provider doesn't support IID_NULL and returns E_NOINTERFACE we want to break out
// of the loop without throwing an exception. Our behavior will match ADODB in that scenario
// where Recordset.Close just releases the interfaces without proccessing remaining results
if ((OleDbHResult.DB_S_NORESULT == hr) || (OleDbHResult.E_NOINTERFACE == hr)) { // MDAC 70874
break;
}
if (null != connection) {
Exception e = OleDbConnection.ProcessResults(hr, connection, command);
if (null != e) {
OleDbException excep = (e as OleDbException);
if (null != excep) {
if (null == exceptions) {
exceptions = new List<OleDbException>();
}
exceptions.Add(excep);
}
else {
Debug.Assert(OleDbHResult.DB_E_OBJECTOPEN == hr, "unexpected");
throw e; // we don't expect to be here, but it could happen
}
}
}
else if (hr < 0) {
SafeNativeMethods.Wrapper.ClearErrorInfo();
break; // MDAC 72694
}
recordsAffected = AddRecordsAffected(recordsAffected, affected);
if (0 != (int)affected) {
loop = 0;
}
else if (2000 <= loop) { // MDAC 72126 (reason for more than 1000 iterations)
NextResultsInfinite(); // MDAC 72738
break;
}
}
}
if (null != exceptions) {
return OleDbException.CombineExceptions(exceptions);
}
return null;
}
static private void NextResultsInfinite() { // MDAC 72738
Bid.Trace("<oledb.OleDbDataReader.NextResultsInfinite|INFO> System.Data.OleDb.OleDbDataReader: 2000 IMultipleResult.GetResult(NULL, DBRESULTFLAG_DEFAULT, IID_NULL, NULL, NULL) iterations with 0 records affected. Stopping suspect infinite loop. To work-around try using ExecuteReader() and iterating through results with NextResult().\n");
// Microsoft's suggestion is that we debug assert so that users will learn of MSOLAP's misbehavior and not call ExecuteNonQuery
Debug.Assert(false, "<oledb.OleDbDataReader.NextResultsInfinite|INFO> System.Data.OleDb.OleDbDataReader: 2000 IMultipleResult.GetResult(NULL, DBRESULTFLAG_DEFAULT, IID_NULL, NULL, NULL) iterations with 0 records affected. Stopping suspect infinite loop. To work-around try using ExecuteReader() and iterating through results with NextResult().\n");
}
override public bool NextResult() {
IntPtr hscp;
Bid.ScopeEnter(out hscp, "<oledb.OleDbDataReader.NextResult|API> %d#\n", ObjectID);
try {
bool retflag = false;
if (IsClosed) {
throw ADP.DataReaderClosed("NextResult");
}
_fieldNameLookup = null;
OleDbCommand command = _command;
UnsafeNativeMethods.IMultipleResults imultipleResults = _imultipleResults;
if (null != imultipleResults) {
DisposeOpenResults();
_hasRows = false;
for (;;) {
Debug.Assert(null == _irow, "NextResult: row loop check");
Debug.Assert(null == _irowset, "NextResult: rowset loop check");
object result = null;
OleDbHResult hr;
IntPtr affected;
if ((null != command) && command.canceling) { // MDAC 69986
Close();
break;
}
Bid.Trace("<oledb.IMultipleResults.GetResult|API|OLEDB> %d#, IID_IRowset\n", ObjectID);
hr = imultipleResults.GetResult(ADP.PtrZero, ODB.DBRESULTFLAG_DEFAULT, ref ODB.IID_IRowset, out affected, out result);
Bid.Trace("<oledb.IMultipleResults.GetResult|API|OLEDB|RET> %08X{HRESULT}, RecordAffected=%Id\n", hr, affected);
if ((0 <= hr) && (null != result)) {
Bid.Trace("<oledb.IUnknown.QueryInterface|API|OLEDB|RowSet> %d#, IRowset\n", ObjectID);
_irowset = (UnsafeNativeMethods.IRowset) result;
}
_recordsAffected = AddRecordsAffected(_recordsAffected, affected);
if (OleDbHResult.DB_S_NORESULT == hr) {
DisposeNativeMultipleResults();
break;
}
// @devnote: infomessage events may be fired from here
ProcessResults(hr);
if (null != _irowset) {
BuildMetaInfo();
HasRowsRead();
retflag = true;
break;
}
}
}
else {
DisposeOpenResults(); // MDAC 70934
_hasRows = false; // MDAC 85850
}
return retflag;
}
finally {
Bid.ScopeLeave(ref hscp);
}
}
override public bool Read() {
IntPtr hscp;
Bid.ScopeEnter(out hscp, "<oledb.OleDbDataReader.Read|API> %d#\n", ObjectID);
try {
bool retflag = false;
OleDbCommand command = _command;
if ((null != command) && command.canceling) { // MDAC 69986
DisposeOpenResults();
}
else if (null != _irowset) {
if (_hasRowsReadCheck) {
_isRead = retflag = _hasRows;
_hasRowsReadCheck = false;
}
else if (_singleRow && _isRead) {
DisposeOpenResults(); // MDAC 66109
}
else {
retflag = ReadRowset();
}
}
else if (null != _irow) {
retflag = ReadRow();
}
else if (IsClosed) {
throw ADP.DataReaderClosed("Read");
}
return retflag;
}
finally {
Bid.ScopeLeave(ref hscp);
}
}
private bool ReadRow() {
if (_isRead) {
_isRead = false; // for DoValueCheck
DisposeNativeRow();
_sequentialOrdinal = -1; // sequentialBytesRead will reset when used
}
else {
_isRead = true;
return (0 < _metadata.Length);
}
return false;
}
private bool ReadRowset() {
Debug.Assert(null != _irowset, "ReadRow: null IRowset");
Debug.Assert(0 <= _metadata.Length, "incorrect state for fieldCount");
// releases bindings as necessary
// bumps current row, else resets it back to initial state
ReleaseCurrentRow();
_sequentialOrdinal = -1; // sequentialBytesRead will reset when used
// making the check if (null != irowset) unnecessary
// if necessary, get next group of row handles
if (IntPtr.Zero == _rowFetchedCount) { // starts at (-1 <= 0)
Debug.Assert(0 == _currentRow, "incorrect state for _currentRow");
Debug.Assert(0 <= _metadata.Length, "incorrect state for fieldCount");
Debug.Assert(0 == _nextAccessorForRetrieval, "incorrect state for nextAccessorForRetrieval");
Debug.Assert(0 == _nextValueForRetrieval, "incorrect state for nextValueForRetrieval");
// @devnote: releasing row handles occurs next time user calls read, skip, or close
GetRowHandles(/*skipCount*/);
}
return ((_currentRow <= (int)_rowFetchedCount) && _isRead);
}
private void ReleaseCurrentRow() {
Debug.Assert(null != _irowset, "ReleaseCurrentRow: no rowset");
if (0 < (int)_rowFetchedCount) {
// release the data in the current row
Bindings[] bindings = _bindings;
Debug.Assert(null != bindings, "ReleaseCurrentRow: null dbBindings");
for (int i = 0; (i < bindings.Length) && (i < _nextAccessorForRetrieval); ++i) {
bindings[i].CleanupBindings();
}
_nextAccessorForRetrieval = 0;
_nextValueForRetrieval = 0;
_currentRow++;
if (_currentRow == (int)_rowFetchedCount) {
ReleaseRowHandles();
}
}
}
private void CreateAccessors(bool allowMultipleAccessor) {
Debug.Assert(null == _bindings, "CreateAccessor: dbBindings already exists");
Debug.Assert(null != _irowset, "CreateAccessor: no IRowset available");
Debug.Assert(null != _metadata && 0 < _metadata.Length, "no columns");
Bindings[] dbBindings = CreateBindingsFromMetaData(allowMultipleAccessor);
UnsafeNativeMethods.IAccessor iaccessor = IAccessor();
for (int i = 0; i < dbBindings.Length; ++i) {
OleDbHResult hr = dbBindings[i].CreateAccessor(iaccessor, ODB.DBACCESSOR_ROWDATA);
if (hr < 0) {
ProcessResults(hr);
}
}
if (IntPtr.Zero == _rowHandleFetchCount) {
_rowHandleFetchCount = new IntPtr(1);
object maxRows = GetPropertyValue(ODB.DBPROP_MAXROWS);
if (maxRows is Int32) {
_rowHandleFetchCount = new IntPtr((int) maxRows);
if ((ADP.PtrZero == _rowHandleFetchCount) || (20 <= (int)_rowHandleFetchCount)) {
_rowHandleFetchCount = new IntPtr(20);
}
}
else if (maxRows is Int64) {
_rowHandleFetchCount = new IntPtr((long) maxRows);
if ((ADP.PtrZero == _rowHandleFetchCount) || (20 <= (long)_rowHandleFetchCount)) {
_rowHandleFetchCount = new IntPtr(20);
}
}
}
if (null == _rowHandleNativeBuffer) {
_rowHandleNativeBuffer = new RowHandleBuffer(_rowHandleFetchCount);
}
}
private Bindings[] CreateBindingsFromMetaData(bool allowMultipleAccessor) {
int bindingCount = 0;
int currentBindingIndex = 0;
MetaData[] metadata = _metadata;
int[] indexToBinding = new int[metadata.Length];
int[] indexWithinBinding = new int[metadata.Length];
// walk through the schemaRows to determine the number of binding groups
if (allowMultipleAccessor) {
if (null != _irowset) {
for (int i = 0; i < indexToBinding.Length; ++i) {
indexToBinding[i] = bindingCount;
indexWithinBinding[i] = currentBindingIndex;
#if false
// @denote: single/multiple Accessors
if ((bindingCount < 2) && IsLong(metadata[i].flags)) {
bindingCount++;
currentBindingIndex = 0;
}
else {
currentBindingIndex++;
}
#elif false
// @devnote: one accessor per column option
bindingCount++;
currentBindingIndex = 0;
#else
// @devnote: one accessor only for IRowset
currentBindingIndex++;
#endif
}
if (0 < currentBindingIndex) { // when blob is not the last column
bindingCount++;
}
}
else if (null != _irow) {
for (int i = 0; i < indexToBinding.Length; ++i) {
indexToBinding[i] = i;
indexWithinBinding[i] = 0;
}
bindingCount = metadata.Length;
}
}
else {
for (int i = 0; i < indexToBinding.Length; ++i) {
indexToBinding[i] = 0;
indexWithinBinding[i] = i;
}
bindingCount = 1;
}
Bindings bindings;
Bindings[] dbbindings = new Bindings[bindingCount];
bindingCount = 0;
// for every column, build tagDBBinding info
for (int index = 0; index < metadata.Length; ++index) {
Debug.Assert(indexToBinding[index] < dbbindings.Length, "bad indexToAccessor");
bindings = dbbindings[indexToBinding[index]];
if (null == bindings) {
bindingCount = 0;
for (int i = index; (i < metadata.Length) && (bindingCount == indexWithinBinding[i]); ++i) {
bindingCount++;
}
dbbindings[indexToBinding[index]] = bindings = new Bindings((OleDbDataReader)this, (null != _irowset), bindingCount);
// runningTotal is buffered to start values on 16-byte boundary
// the first columnCount * 8 bytes are for the length and status fields
//bindings.DataBufferSize = (bindingCount + (bindingCount % 2)) * sizeof_int64;
}
MetaData info = metadata[index];
int maxLen = info.type.fixlen;
short getType = info.type.wType;
Debug.Assert(NativeDBType.STR != getType, "Should have bound as WSTR");
Debug.Assert(!NativeDBType.HasHighBit(getType), "CreateAccessor - unexpected high bits on datatype");
if (-1 != info.size) {
if (info.type.islong) {
maxLen = ADP.PtrSize;
getType = (short)((ushort) getType | (ushort) NativeDBType.BYREF);
}
else if (-1 == maxLen) {
// @devnote: not using provider owned memory for PDC, no one really supports it anyway.
/*if (((null != connection) && connection.PropertyGetProviderOwnedMemory())
|| ((null != command) && command.Connection.PropertyGetProviderOwnedMemory())) {
bindings.MemOwner = DBMemOwner.ProviderOwned;
bindings.MaxLen = ADP.PtrSize;
bindings.DbType = (short) (getType | DbType.BYREF);
}
else*/
if (ODB.LargeDataSize < info.size) {
maxLen = ADP.PtrSize;
getType = (short)((ushort) getType | (ushort)NativeDBType.BYREF);
}
else if ((NativeDBType.WSTR == getType) && (-1 != info.size)) { // WebData 99298
maxLen = info.size * 2 + 2;
}
else {
maxLen = info.size;
}
}
}
else if (maxLen < 0) {
// if variable length and no defined size we require this to be byref at this time
/*if (((null != connection) && connection.PropertyGetProviderOwnedMemory())
|| ((null != command) && command.Connection.PropertyGetProviderOwnedMemory())) {
bindings.MemOwner = DBMemOwner.ProviderOwned;
}*/
maxLen = ADP.PtrSize;
getType = (short)((ushort) getType | (ushort)NativeDBType.BYREF);
}
currentBindingIndex = indexWithinBinding[index];
bindings.CurrentIndex = currentBindingIndex;
bindings.Ordinal = info.ordinal;
bindings.Part = info.type.dbPart;
bindings.Precision = (byte) info.precision;
bindings.Scale = (byte) info.scale;
bindings.DbType = (short) getType;
bindings.MaxLen = maxLen; // also increments databuffer size (uses DbType)
//bindings.ValueOffset = // set via MaxLen
//bindings.LengthOffset = // set via MaxLen
//bindings.StatusOffset = // set via MaxLen
//bindings.TypeInfoPtr = 0;
//bindings.ObjectPtr = 0;
//bindings.BindExtPtr = 0;
//bindings.MemOwner = /*DBMEMOWNER_CLIENTOWNED*/0;
//bindings.ParamIO = ODB.DBPARAMIO_NOTPARAM;
//bindings.Flags = 0;
if (Bid.AdvancedOn) {
Bid.Trace("<oledb.struct.tagDBBINDING|INFO|ADV> index=%d, columnName='%ls'\n", index, info.columnName);//, bindings.bindings[index]);
}
}
int count = 0, indexStart = 0;
for (int i = 0; i < dbbindings.Length; ++i) {
indexStart = dbbindings[i].AllocateForAccessor(this, indexStart, i);
ColumnBinding[] columnBindings = dbbindings[i].ColumnBindings();
for (int k = 0; k < columnBindings.Length; ++k) {
Debug.Assert(count == columnBindings[k].Index, "column binding mismatch");
metadata[count].columnBinding = columnBindings[k];
metadata[count].bindings = dbbindings[i];
count++;
}
}
_bindings = dbbindings;
return dbbindings;
}
private void GetRowHandles(/*int skipCount*/) {
Debug.Assert(0 < (int)_rowHandleFetchCount, "GetRowHandles: bad _rowHandleFetchCount");
Debug.Assert(!_isRead, "GetRowHandles: _isRead");
OleDbHResult hr = 0;
RowHandleBuffer rowHandleBuffer = _rowHandleNativeBuffer;
bool mustRelease = false;
RuntimeHelpers.PrepareConstrainedRegions();
try {
rowHandleBuffer.DangerousAddRef(ref mustRelease);
IntPtr rowHandlesPtr = rowHandleBuffer.DangerousGetHandle();
UnsafeNativeMethods.IRowset irowset = IRowset();
try {
Bid.Trace("<oledb.IRowset.GetNextRows|API|OLEDB> %d#, Chapter=%Id, RowsRequested=%Id\n", ObjectID, _chapterHandle.HChapter, _rowHandleFetchCount);
hr = irowset.GetNextRows(_chapterHandle.HChapter, /*skipCount*/IntPtr.Zero, _rowHandleFetchCount, out _rowFetchedCount, ref rowHandlesPtr);
Bid.Trace("<oledb.IRowset.GetNextRows|API|OLEDB|RET> %08X{HRESULT}, RowsObtained=%Id\n", hr, _rowFetchedCount);
Debug.Assert(rowHandleBuffer.DangerousGetHandle() == rowHandlesPtr, "rowhandlebuffer changed");
}
catch(System.InvalidCastException e) { // MDAC 64320
throw ODB.ThreadApartmentState(e);
}
}
finally {
if (mustRelease) {
rowHandleBuffer.DangerousRelease();
}
}
//if (/*DB_S_ROWLIMITEXCEEDED*/0x00040EC0 == hr) {
// _rowHandleFetchCount = 1;
// _isRead = true;
//} else
if (hr < 0) {
// filter out the BadStartPosition due to the skipCount which
// maybe greater than the number of rows in the return rowset
//const int /*OLEDB_Error.*/DB_E_BADSTARTPOSITION = unchecked((int)0x80040E1E);
//if (DB_E_BADSTARTPOSITION != hr)
ProcessResults(hr);
}
_isRead = ((OleDbHResult.DB_S_ENDOFROWSET != hr) || (0 < (int)_rowFetchedCount)); // MDAC 59264
_rowFetchedCount = (IntPtr)Math.Max((int)_rowFetchedCount, 0);
}
private void GetRowDataFromHandle() {
Debug.Assert(null != _bindings, "GetRowDataFromHandle: null dbBindings");
Debug.Assert(null != _rowHandleNativeBuffer, "GetRowDataFromHandle: null dbBindings");
OleDbHResult hr = 0;
UnsafeNativeMethods.IRowset irowset = IRowset();
IntPtr rowHandle = _rowHandleNativeBuffer.GetRowHandle(_currentRow);
RowBinding rowBinding = _bindings[_nextAccessorForRetrieval].RowBinding();
IntPtr accessorHandle = rowBinding.DangerousGetAccessorHandle();
bool mustRelease = false;
RuntimeHelpers.PrepareConstrainedRegions();
try {
rowBinding.DangerousAddRef(ref mustRelease);
rowBinding.StartDataBlock();
IntPtr dataPtr = rowBinding.DangerousGetDataPtr();
Bid.Trace("<oledb.IRowset.GetData|API|OLEDB> %d#, RowHandle=%Id, AccessorHandle=%Id\n", ObjectID, rowHandle, accessorHandle);
hr = irowset.GetData(rowHandle, accessorHandle, dataPtr);
Bid.Trace("<oledb.IRowset.GetData|API|OLEDB|RET> %08X{HRESULT}\n", hr);
}
finally {
if (mustRelease) {
rowBinding.DangerousRelease();
}
}
//if (AdapterSwitches.DataError.TraceWarning) {
// DBBindings binding = _dbBindings[i];
// for (int k = 0; k < binding.Count; ++k) {
// binding.CurrentIndex = k;
// Debug.WriteLine("Status[" + k.ToString(CultureInfo.InvariantCulture) + "] = " + binding.StatusValue.ToString("G", CultureInfo.InvariantCulture));
// }
//}
_nextAccessorForRetrieval++;
if (hr < 0) {
ProcessResults(hr);
}
}
private void ReleaseRowHandles() {
Debug.Assert(0 < (int)_rowFetchedCount, "invalid _rowFetchedCount");
OleDbHResult hr;
UnsafeNativeMethods.IRowset irowset = IRowset();
Bid.Trace("<oledb.IRowset.ReleaseRows|API|OLEDB> %d#, Request=%Id\n", ObjectID, _rowFetchedCount);
hr = irowset.ReleaseRows(_rowFetchedCount, _rowHandleNativeBuffer, ADP.PtrZero, ADP.PtrZero, ADP.PtrZero);
Bid.Trace("<oledb.IRowset.ReleaseRows|API|OLEDB|RET> %08X{HRESULT}\n", hr);
if (hr < 0) {
//ProcessFailure(hr);
//ProcessFailure(hr);
SafeNativeMethods.Wrapper.ClearErrorInfo();
}
_rowFetchedCount = IntPtr.Zero;
_currentRow = 0;
_isRead = false; // MDAC 59264
}
private object GetPropertyValue(int propertyId) { // MDAC 72106
if (null != _irowset) {
return GetPropertyOnRowset(OleDbPropertySetGuid.Rowset, propertyId);
}
else if (null != _command) {
return _command.GetPropertyValue(OleDbPropertySetGuid.Rowset, propertyId);
}
return OleDbPropertyStatus.NotSupported;
}
private object GetPropertyOnRowset(Guid propertySet, int propertyID) {
OleDbHResult hr;
tagDBPROP[] dbprops;
UnsafeNativeMethods.IRowsetInfo irowsetinfo = IRowsetInfo();
using(PropertyIDSet propidset = new PropertyIDSet(propertySet, propertyID)) {
using(DBPropSet propset = new DBPropSet(irowsetinfo, propidset, out hr)) {
if (hr < 0) {
// VSDD 621427: OLEDB Data Reader masks provider specific errors by raising "Internal .Net Framework Data Provider error 30."
// DBPropSet c-tor will register the exception and it will be raised at GetPropertySet call in case of failure
SafeNativeMethods.Wrapper.ClearErrorInfo();
}
dbprops = propset.GetPropertySet(0, out propertySet);
}
}
if (OleDbPropertyStatus.Ok == dbprops[0].dwStatus) {
return dbprops[0].vValue;
}
return dbprops[0].dwStatus;
}
private void GetRowValue() {
Debug.Assert(null != _irow, "GetRowValue: null IRow");
Debug.Assert(null != _metadata, "GetRowValue: null MetaData");
Bindings bindings = _bindings[_nextAccessorForRetrieval];
ColumnBinding[] columnBindings = bindings.ColumnBindings();
RowBinding rowBinding = bindings.RowBinding();
Debug.Assert(_nextValueForRetrieval <= columnBindings[0].Index, "backwards retrieval");
bool mustReleaseBinding = false;
bool[] mustRelease = new bool[columnBindings.Length];
StringMemHandle[] sptr = new StringMemHandle[columnBindings.Length];
RuntimeHelpers.PrepareConstrainedRegions();
try {
for (int i = 0; i < columnBindings.Length; ++i) {
bindings.CurrentIndex = i;
sptr[i] = null;
MetaData info = _metadata[columnBindings[i].Index];
if ((ODB.DBKIND_GUID_NAME == info.kind) || (ODB.DBKIND_NAME == info.kind)) {
sptr[i] = new StringMemHandle(info.idname);
columnBindings[i]._sptr = sptr[i];
}
sptr[i].DangerousAddRef(ref mustRelease[i]);
IntPtr ulPropid = ((null != sptr[i]) ? sptr[i].DangerousGetHandle() : info.propid);
bindings.GuidKindName(info.guid, info.kind, ulPropid);
}
OleDbHResult hr;
tagDBCOLUMNACCESS[] access = bindings.DBColumnAccess;
rowBinding.DangerousAddRef(ref mustReleaseBinding);
rowBinding.StartDataBlock();
UnsafeNativeMethods.IRow irow = IRow();
Bid.Trace("<oledb.IRow.GetColumns|API|OLEDB> %d#\n", ObjectID);
hr = irow.GetColumns((IntPtr)access.Length, access);
Bid.Trace("<oledb.IRow.GetColumns|API|OLEDB|RET> %08X{HRESULT}\n", hr);
}
finally {
if (mustReleaseBinding) {
rowBinding.DangerousRelease();
}
for (int i = 0; i < mustRelease.Length; i++) {
if (mustRelease[i]) {
sptr[i].DangerousRelease();
}
}
}
_nextAccessorForRetrieval++;
}
private Int32 IndexOf(Hashtable hash, string name) { // MDAC 67385
// via case sensitive search, first match with lowest ordinal matches
object index = hash[name];
if (null != index) {
return (int) index; // match via case-insensitive or by chance lowercase
}
// via case insensitive search, first match with lowest ordinal matches
string tmp = name.ToLower(CultureInfo.InvariantCulture);
index = hash[tmp]; // match via lowercase
return ((null != index) ? (int) index : -1);
}
private void AppendSchemaInfo() {
Debug.Assert(null != _connection, "null connection");
Debug.Assert(null != _metadata, "no _metadata");
if (_metadata.Length <= 0) {
return;
}
int keyCount = 0;
for (int i = 0; i < _metadata.Length; ++i) {
if (_metadata[i].isKeyColumn && !_metadata[i].isHidden) { // MDAC 90411
keyCount++;
}
}
if (0 != keyCount) /*|| _connection.IsServer_msdaora || _connection.IsServer_Microsoft_SQL)*/ { // MDAC 60109
return;
}
string schemaName, catalogName; // enforce single table
string baseSchemaName = null, baseCatalogName = null, baseTableName = null;
for (int i = 0; i < _metadata.Length; ++i) {
MetaData info = _metadata[i];
if ((null != info.baseTableName) && (0 < info.baseTableName.Length)) {
catalogName = ((null != info.baseCatalogName) ? info.baseCatalogName : ""); // MDAC 67249
schemaName = ((null != info.baseSchemaName) ? info.baseSchemaName : "");
if (null == baseTableName) {
baseSchemaName = schemaName;
baseCatalogName = catalogName;
baseTableName = info.baseTableName;
}
else if ((0 != ADP.SrcCompare(baseTableName, info.baseTableName))
|| (0 != ADP.SrcCompare(baseCatalogName, catalogName))
|| (0 != ADP.SrcCompare(baseSchemaName, schemaName))) { // MDAC 71808
#if DEBUG
if (AdapterSwitches.DataSchema.TraceVerbose) {
Debug.WriteLine("Multiple BaseTableName detected:"
+" <"+baseCatalogName+"."+baseCatalogName+"."+baseTableName+">"
+" <"+info.baseCatalogName+"."+info.baseCatalogName+"."+info.baseTableName+">");
}
#endif
baseTableName = null;
break;
}
}
}
if (null == baseTableName) {
return;
}
baseCatalogName = ADP.IsEmpty(baseCatalogName) ? null : baseCatalogName;
baseSchemaName = ADP.IsEmpty(baseSchemaName) ? null : baseSchemaName;
if (null != _connection) { // MDAC 67394
if (ODB.DBPROPVAL_IC_SENSITIVE == _connection.QuotedIdentifierCase()) {
string p = null, s = null;
_connection.GetLiteralQuotes(ADP.GetSchemaTable, out s, out p);
if (null == s) {
s = "";
}
if (null == p) {
p = "";
}
baseTableName = s + baseTableName + p;
}
}
Hashtable baseColumnNames = new Hashtable(_metadata.Length * 2); // MDAC 67385
for (int i = _metadata.Length-1; 0 <= i; --i) {
string basecolumname = _metadata[i].baseColumnName;
if (!ADP.IsEmpty(basecolumname)) {
baseColumnNames[basecolumname] = i;
}
}
for (int i = 0; i < _metadata.Length; ++i) {
string basecolumname = _metadata[i].baseColumnName;
if (!ADP.IsEmpty(basecolumname)) {
basecolumname = basecolumname.ToLower(CultureInfo.InvariantCulture);
if (!baseColumnNames.Contains(basecolumname)) {
baseColumnNames[basecolumname] = i;
}
}
}
// look for primary keys in the table
if (_connection.SupportSchemaRowset(OleDbSchemaGuid.Primary_Keys)) {
Object[] restrictions = new Object[] { baseCatalogName, baseSchemaName, baseTableName };
keyCount = AppendSchemaPrimaryKey(baseColumnNames, restrictions);
}
if (0 != keyCount) {
return;
}
// look for a single unique contraint that can be upgraded
if (_connection.SupportSchemaRowset(OleDbSchemaGuid.Indexes)) {
Object[] restrictions = new Object[] { baseCatalogName, baseSchemaName, null, null, baseTableName };
AppendSchemaUniqueIndexAsKey(baseColumnNames, restrictions);
}
}
private int AppendSchemaPrimaryKey(Hashtable baseColumnNames, object[] restrictions) {
int keyCount = 0;
bool partialPrimaryKey = false;
DataTable table = null;
try {
table = _connection.GetSchemaRowset(OleDbSchemaGuid.Primary_Keys, restrictions);
}
catch(Exception e) {
//
if (!ADP.IsCatchableExceptionType(e)) {
throw;
}
ADP.TraceExceptionWithoutRethrow(e);
}
if (null != table) {
DataColumnCollection dataColumns = table.Columns;
int nameColumnIndex = dataColumns.IndexOf(ODB.COLUMN_NAME);
if (-1 != nameColumnIndex) {
DataColumn nameColumn = dataColumns[nameColumnIndex];
foreach(DataRow dataRow in table.Rows) {
string name = (string) dataRow[nameColumn, DataRowVersion.Default];
int metaindex = IndexOf(baseColumnNames, name); // MDAC 67385
if (0 <= metaindex) {
MetaData info = _metadata[metaindex];
info.isKeyColumn = true;
info.flags &= ~ODB.DBCOLUMNFLAGS_ISNULLABLE;
keyCount++;
}
else {
#if DEBUG
if (AdapterSwitches.DataSchema.TraceVerbose) {
Debug.WriteLine("PartialKeyColumn detected: <" + name + "> metaindex=" + metaindex);
}
#endif
partialPrimaryKey = true;
break;
}
}
}
}
if (partialPrimaryKey) { // partial primary key detected
for (int i = 0; i < _metadata.Length; ++i) {
_metadata[i].isKeyColumn = false;
}
return -1;
}
return keyCount;
}
private void AppendSchemaUniqueIndexAsKey(Hashtable baseColumnNames, object[] restrictions) {
bool partialPrimaryKey = false;
DataTable table = null;
try { // MDAC 66209
table = _connection.GetSchemaRowset(OleDbSchemaGuid.Indexes, restrictions);
}
catch(Exception e) {
//
if (!ADP.IsCatchableExceptionType(e)) {
throw;
}
ADP.TraceExceptionWithoutRethrow(e);
}
if (null != table) {
DataColumnCollection dataColumns = table.Columns;
int indxIndex = dataColumns.IndexOf(ODB.INDEX_NAME);
int pkeyIndex = dataColumns.IndexOf(ODB.PRIMARY_KEY);
int uniqIndex = dataColumns.IndexOf(ODB.UNIQUE);
int nameIndex = dataColumns.IndexOf(ODB.COLUMN_NAME);
int nullIndex = dataColumns.IndexOf(ODB.NULLS);
if ((-1 != indxIndex) && (-1 != pkeyIndex) && (-1 != uniqIndex) && (-1 != nameIndex)) {
DataColumn indxColumn = dataColumns[indxIndex];
DataColumn pkeyColumn = dataColumns[pkeyIndex];
DataColumn uniqCOlumn = dataColumns[uniqIndex];
DataColumn nameColumn = dataColumns[nameIndex];
DataColumn nulls = ((-1 != nullIndex) ? dataColumns[nullIndex] : null);
bool[] keys = new bool[_metadata.Length];
bool[] uniq = new bool[_metadata.Length];
string uniqueIndexName = null;
// match pkey name BaseColumnName
foreach(DataRow dataRow in table.Rows) {
bool isPKey = (!dataRow.IsNull(pkeyColumn, DataRowVersion.Default) && (bool)dataRow[pkeyColumn, DataRowVersion.Default]);
bool isUniq = (!dataRow.IsNull(uniqCOlumn, DataRowVersion.Default) && (bool)dataRow[uniqCOlumn, DataRowVersion.Default]);
bool nullsVal = (null != nulls) && (dataRow.IsNull(nulls, DataRowVersion.Default) || (ODB.DBPROPVAL_IN_ALLOWNULL == Convert.ToInt32(dataRow[nulls, DataRowVersion.Default], CultureInfo.InvariantCulture)));
if (isPKey || isUniq) {
string name = (string) dataRow[nameColumn, DataRowVersion.Default];
int metaindex = IndexOf(baseColumnNames, name); // MDAC 67385
if (0 <= metaindex) {
if (isPKey) {
keys[metaindex] = true;
}
if (isUniq && (null != uniq)) {
uniq[metaindex] = true;
string indexname = (string) dataRow[indxColumn, DataRowVersion.Default];
if (null == uniqueIndexName) {
uniqueIndexName = indexname;
}
else if (indexname != uniqueIndexName) {
#if DEBUG
if (AdapterSwitches.DataSchema.TraceVerbose) {
Debug.WriteLine("MultipleUniqueIndexes detected: <" + uniqueIndexName + "> <" + indexname + ">");
}
#endif
uniq = null;
}
}
}
else if (isPKey) {
#if DEBUG
if (AdapterSwitches.DataSchema.TraceVerbose) {
Debug.WriteLine("PartialKeyColumn detected: " + name);
}
#endif
partialPrimaryKey = true;
break;
}
else if (null != uniqueIndexName) {
string indexname = (string) dataRow[indxColumn, DataRowVersion.Default];
if (indexname != uniqueIndexName) {
#if DEBUG
if (AdapterSwitches.DataSchema.TraceVerbose) {
Debug.WriteLine("PartialUniqueIndexes detected: <" + uniqueIndexName + "> <" + indexname + ">");
}
#endif
uniq = null;
}
}
}
}
if (partialPrimaryKey) {
for (int i = 0; i < _metadata.Length; ++i) {
_metadata[i].isKeyColumn = false;
}
return;
}
else if (null != uniq) {
#if DEBUG
if (AdapterSwitches.DataSchema.TraceVerbose) {
Debug.WriteLine("upgrade single unique index to be a key: <" + uniqueIndexName + ">");
}
#endif
// upgrade single unique index to be a key
for (int i = 0; i < _metadata.Length; ++i) {
_metadata[i].isKeyColumn = uniq[i];
}
}
}
}
}
private MetaData FindMetaData(string name) {
int index = _fieldNameLookup.IndexOfName(name);
return ((-1 != index) ? _metadata[index] : null);
}
internal void DumpToSchemaTable(UnsafeNativeMethods.IRowset rowset) {
List<MetaData> metainfo = new List<MetaData>();
object hiddenColumns = null;
using (OleDbDataReader dataReader = new OleDbDataReader(_connection, _command, Int32.MinValue, 0)) {
dataReader.InitializeIRowset(rowset, ChapterHandle.DB_NULL_HCHAPTER, IntPtr.Zero);
dataReader.BuildSchemaTableInfo(rowset, true, false);
hiddenColumns = GetPropertyValue(ODB.DBPROP_HIDDENCOLUMNS); // MDAC 55611, 72106
if (0 == dataReader.FieldCount) {
return;
}
Debug.Assert(null == dataReader._fieldNameLookup, "lookup already exists");
FieldNameLookup lookup = new FieldNameLookup(dataReader, -1);
dataReader._fieldNameLookup = lookup;
// This column, together with the DBCOLUMN_GUID and DBCOLUMN_PROPID
// columns, forms the ID of the column. One or more (but not all) of these columns
// will be NULL, depending on which elements of the DBID structure the provider uses.
MetaData columnidname = dataReader.FindMetaData(ODB.DBCOLUMN_IDNAME);
MetaData columnguid = dataReader.FindMetaData(ODB.DBCOLUMN_GUID);
MetaData columnpropid = dataReader.FindMetaData(ODB.DBCOLUMN_PROPID);
MetaData columnname = dataReader.FindMetaData(ODB.DBCOLUMN_NAME);
MetaData columnordinal = dataReader.FindMetaData(ODB.DBCOLUMN_NUMBER);
MetaData dbtype = dataReader.FindMetaData(ODB.DBCOLUMN_TYPE);
MetaData columnsize = dataReader.FindMetaData(ODB.DBCOLUMN_COLUMNSIZE);
MetaData numericprecision = dataReader.FindMetaData(ODB.DBCOLUMN_PRECISION);
MetaData numericscale = dataReader.FindMetaData(ODB.DBCOLUMN_SCALE);
MetaData columnflags = dataReader.FindMetaData(ODB.DBCOLUMN_FLAGS);
MetaData baseschemaname = dataReader.FindMetaData(ODB.DBCOLUMN_BASESCHEMANAME);
MetaData basecatalogname = dataReader.FindMetaData(ODB.DBCOLUMN_BASECATALOGNAME);
MetaData basetablename = dataReader.FindMetaData(ODB.DBCOLUMN_BASETABLENAME);
MetaData basecolumnname = dataReader.FindMetaData(ODB.DBCOLUMN_BASECOLUMNNAME);
MetaData isautoincrement = dataReader.FindMetaData(ODB.DBCOLUMN_ISAUTOINCREMENT);
MetaData isunique = dataReader.FindMetaData(ODB.DBCOLUMN_ISUNIQUE);
MetaData iskeycolumn = dataReader.FindMetaData(ODB.DBCOLUMN_KEYCOLUMN);
// @devnote: because we want to use the DBACCESSOR_OPTIMIZED bit,
// we are required to create the accessor before fetching any rows
dataReader.CreateAccessors(false);
ColumnBinding binding;
while (dataReader.ReadRowset()) {
dataReader.GetRowDataFromHandle();
MetaData info = new MetaData();
binding = columnidname.columnBinding; // MDAC 72627
if (!binding.IsValueNull()) {
info.idname = (string)binding.Value();
info.kind = ODB.DBKIND_NAME;
}
binding = columnguid.columnBinding;
if (!binding.IsValueNull()) {
info.guid = binding.Value_GUID();
info.kind = ((ODB.DBKIND_NAME == info.kind) ? ODB.DBKIND_GUID_NAME : ODB.DBKIND_GUID);
}
binding = columnpropid.columnBinding;
if (!binding.IsValueNull()) {
info.propid = new IntPtr(binding.Value_UI4());
info.kind = ((ODB.DBKIND_GUID == info.kind) ? ODB.DBKIND_GUID_PROPID : ODB.DBKIND_PROPID);
}
binding = columnname.columnBinding;
if (!binding.IsValueNull()) {
info.columnName = (string)binding.Value();
}
else {
info.columnName = "";
}
if (4 == ADP.PtrSize) {
info.ordinal = (IntPtr)columnordinal.columnBinding.Value_UI4();
}
else {
info.ordinal = (IntPtr)columnordinal.columnBinding.Value_UI8();
}
short wType = unchecked((short) dbtype.columnBinding.Value_UI2());
if (4 == ADP.PtrSize) {
info.size = unchecked((int) columnsize.columnBinding.Value_UI4()); // WebData 99298
}
else {
info.size = ADP.IntPtrToInt32((IntPtr)unchecked((long)columnsize.columnBinding.Value_UI8()));
}
binding = numericprecision.columnBinding;
if (!binding.IsValueNull()) {
info.precision = (byte)binding.Value_UI2();
}
binding = numericscale.columnBinding;
if (!binding.IsValueNull()) {
info.scale = (byte)binding.Value_I2();
}
info.flags = unchecked((int) columnflags.columnBinding.Value_UI4());
bool islong = OleDbDataReader.IsLong(info.flags);
bool isfixed = OleDbDataReader.IsFixed(info.flags);
NativeDBType dbType = NativeDBType.FromDBType(wType, islong, isfixed);
info.type = dbType;
if (null != isautoincrement) {
binding = isautoincrement.columnBinding;
if (!binding.IsValueNull()) {
info.isAutoIncrement = binding.Value_BOOL();
}
}
if (null != isunique) {
binding = isunique.columnBinding;
if (!binding.IsValueNull()) {
info.isUnique = binding.Value_BOOL();
}
}
if (null != iskeycolumn) {
binding = iskeycolumn.columnBinding;
if (!binding.IsValueNull()) {
info.isKeyColumn = binding.Value_BOOL();
}
}
if (null != baseschemaname) {
binding = baseschemaname.columnBinding;
if (!binding.IsValueNull()) {
info.baseSchemaName = binding.ValueString();
}
}
if (null != basecatalogname) {
binding = basecatalogname.columnBinding;
if (!binding.IsValueNull()) {
info.baseCatalogName = binding.ValueString();
}
}
if (null != basetablename) {
binding = basetablename.columnBinding;
if (!binding.IsValueNull()) {
info.baseTableName = binding.ValueString();
}
}
if (null != basecolumnname) {
binding = basecolumnname.columnBinding;
if (!binding.IsValueNull()) {
info.baseColumnName = binding.ValueString();
}
}
metainfo.Add(info);
}
}
int visibleCount = metainfo.Count;
if (hiddenColumns is Int32) {
visibleCount -= (int)hiddenColumns;
}
// VSTFDevDiv 479578:
// if one key column is invalidated, they all need to be invalidated. The SET is the key,
// and subsets likely are not accurate keys. Note the assumption that the two loops below
// will traverse the entire set of columns.
bool disallowKeyColumns = false;
for (int index = metainfo.Count - 1; visibleCount <= index; --index) {
MetaData info = metainfo[index];
info.isHidden = true;
if (disallowKeyColumns) {
info.isKeyColumn = false;
}
else if (info.guid.Equals(ODB.DBCOL_SPECIALCOL)) { // MDAC 90827
info.isKeyColumn = false;
// This is the first key column to be invalidated, scan back through the
// columns we already processed to make sure none of those are marked as keys.
disallowKeyColumns = true;
for (int index2 = metainfo.Count-1; index < index2; --index2) {
metainfo[index2].isKeyColumn = false;
}
}
}
for (int index = visibleCount - 1; 0 <= index; --index) {
MetaData info = metainfo[index];
if (disallowKeyColumns) {
info.isKeyColumn = false;
}
if (info.guid.Equals(ODB.DBCOL_SPECIALCOL)) { // MDAC 72390
#if DEBUG
if (AdapterSwitches.DataSchema.TraceVerbose) {
Debug.WriteLine("Filtered Column: DBCOLUMN_GUID=DBCOL_SPECIALCOL DBCOLUMN_NAME=" + info.columnName + " DBCOLUMN_KEYCOLUMN=" + info.isKeyColumn);
}
#endif
info.isHidden = true;
visibleCount--;
}
#if WIN32
else if (0 >= (int)info.ordinal) {
#else
else if (0 >= (long)info.ordinal) {
#endif
#if DEBUG
if (AdapterSwitches.DataSchema.TraceVerbose) {
Debug.WriteLine("Filtered Column: DBCOLUMN_NUMBER=" + info.ordinal.ToInt64().ToString(CultureInfo.InvariantCulture) + " DBCOLUMN_NAME=" + info.columnName);
}
#endif
info.isHidden = true;
visibleCount--;
}
else if (OleDbDataReader.DoColumnDropFilter(info.flags)) {
#if DEBUG
if (AdapterSwitches.DataSchema.TraceVerbose) {
Debug.WriteLine("Filtered Column: DBCOLUMN_FLAGS=" + info.flags.ToString("X8", (System.IFormatProvider)null) + " DBCOLUMN_NAME=" + info.columnName);
}
#endif
info.isHidden = true;
visibleCount--;
}
}
//
metainfo.Sort(); // MDAC 68319
_visibleFieldCount = visibleCount;
_metadata = metainfo.ToArray();
}
static internal void GenerateSchemaTable(OleDbDataReader dataReader, object handle, CommandBehavior behavior) {
if (0 != (CommandBehavior.KeyInfo & behavior)) {
dataReader.BuildSchemaTableRowset(handle); // tries IColumnsRowset first then IColumnsInfo
dataReader.AppendSchemaInfo();
}
else {
dataReader.BuildSchemaTableInfo(handle, false, false); // only tries IColumnsInfo
}
MetaData[] metadata = dataReader.MetaData;
if ((null != metadata) && (0 < metadata.Length)) {
dataReader.BuildSchemaTable(metadata);
}
}
static private bool DoColumnDropFilter(int flags) {
return (0 != (ODB.DBCOLUMNFLAGS_ISBOOKMARK & flags));
}
static private bool IsLong(int flags) {
return (0 != (ODB.DBCOLUMNFLAGS_ISLONG & flags));
}
static private bool IsFixed(int flags) {
return (0 != (ODB.DBCOLUMNFLAGS_ISFIXEDLENGTH & flags));
}
static private bool IsRowVersion(int flags) {
return (0 != (ODB.DBCOLUMNFLAGS_ISROWID_DBCOLUMNFLAGS_ISROWVER & flags));
}
static private bool AllowDBNull(int flags) {
return (0 != (ODB.DBCOLUMNFLAGS_ISNULLABLE & flags));
}
static private bool AllowDBNullMaybeNull(int flags) {
return (0 != (ODB.DBCOLUMNFLAGS_ISNULLABLE_DBCOLUMNFLAGS_MAYBENULL & flags));
}
static private bool IsReadOnly(int flags) {
return (0 == (ODB.DBCOLUMNFLAGS_WRITE_DBCOLUMNFLAGS_WRITEUNKNOWN & flags));
}
}
sealed internal class MetaData : IComparable {
internal Bindings bindings;
internal ColumnBinding columnBinding;
internal string columnName;
internal Guid guid; // MDAC 72627
internal int kind;
internal IntPtr propid;
internal string idname;
internal NativeDBType type;
internal IntPtr ordinal;
internal int size;
internal int flags;
internal byte precision;
internal byte scale;
internal bool isAutoIncrement;
internal bool isUnique;
internal bool isKeyColumn;
internal bool isHidden;
internal string baseSchemaName;
internal string baseCatalogName;
internal string baseTableName;
internal string baseColumnName;
int IComparable.CompareTo(object obj) { // MDAC 68319
if (isHidden == (obj as MetaData).isHidden) {
#if WIN32
return ((int)ordinal - (int)(obj as MetaData).ordinal);
#else
long v = ((long)ordinal - (long)(obj as MetaData).ordinal);
return ((0 < v) ? 1 : ((v < 0) ? -1 : 0));
#endif
}
return (isHidden) ? 1 : -1; // ensure that all hidden columns come after non-hidden columns
}
internal MetaData() {
}
}
}
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