|
//------------------------------------------------------------------------------
// <copyright file="Merger.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 {
using System;
using System.Collections;
using System.Collections.Generic;
using System.ComponentModel;
using System.Diagnostics;
/// <devdoc>
/// Merge Utilities.
/// </devdoc>
internal sealed class Merger {
private DataSet dataSet = null;
private DataTable dataTable = null;
private bool preserveChanges;
private MissingSchemaAction missingSchemaAction;
private bool isStandAlonetable = false;
private bool _IgnoreNSforTableLookup = false; // Everett Behavior : SQL BU DT 370850
internal Merger(DataSet dataSet, bool preserveChanges, MissingSchemaAction missingSchemaAction) {
this.dataSet = dataSet;
this.preserveChanges = preserveChanges;
// map AddWithKey -> Add
if (missingSchemaAction == MissingSchemaAction.AddWithKey)
this.missingSchemaAction = MissingSchemaAction.Add;
else
this.missingSchemaAction = missingSchemaAction;
}
internal Merger(DataTable dataTable, bool preserveChanges, MissingSchemaAction missingSchemaAction) {
isStandAlonetable = true;
this.dataTable = dataTable;
this.preserveChanges = preserveChanges;
// map AddWithKey -> Add
if (missingSchemaAction == MissingSchemaAction.AddWithKey)
this.missingSchemaAction = MissingSchemaAction.Add;
else
this.missingSchemaAction = missingSchemaAction;
}
internal void MergeDataSet(DataSet source) {
if (source == dataSet) return; //somebody is doing an 'automerge'
bool fEnforce = dataSet.EnforceConstraints;
dataSet.EnforceConstraints = false;
_IgnoreNSforTableLookup = (dataSet.namespaceURI != source.namespaceURI); // if two DataSets have different
// Namespaces, ignore NS for table lookups as we wont be able to find the right tables which inherits its NS
List<DataColumn> existingColumns = null;// need to cache existing columns
if (MissingSchemaAction.Add == missingSchemaAction) {
existingColumns = new List<DataColumn>(); // need to cache existing columns
foreach(DataTable dt in dataSet.Tables) {
foreach(DataColumn dc in dt.Columns) {
existingColumns.Add(dc);
}
}
}
for (int i = 0; i < source.Tables.Count; i++) {
MergeTableData(source.Tables[i]); // since column expression might have dependency on relation, we do not set
//column expression at this point. We need to set it after adding relations
}
if (MissingSchemaAction.Ignore != missingSchemaAction) {
// Add all independent constraints
MergeConstraints(source);
// Add all relationships
for (int i = 0; i < source.Relations.Count; i++) {
MergeRelation(source.Relations[i]);
}
}
// WebData 88234
if (MissingSchemaAction.Add == missingSchemaAction) { // for which other options we should add expressions also?
foreach (DataTable sourceTable in source.Tables) {
DataTable targetTable;
if (_IgnoreNSforTableLookup) {
targetTable = dataSet.Tables[sourceTable.TableName];
}
else {
targetTable = dataSet.Tables[sourceTable.TableName, sourceTable.Namespace];// we know that target table wont be null since MissingSchemaAction is Add , we have already added it!
}
foreach(DataColumn dc in sourceTable.Columns) { // Should we overwrite the previous expression column? No, refer to spec, if it is new column we need to add the schema
if (dc.Computed) {
DataColumn targetColumn = targetTable.Columns[dc.ColumnName];
if (!existingColumns.Contains(targetColumn)) {
targetColumn.Expression = dc.Expression;
}
}
}
}
}
MergeExtendedProperties(source.ExtendedProperties, dataSet.ExtendedProperties);
foreach(DataTable dt in dataSet.Tables)
dt.EvaluateExpressions();
dataSet.EnforceConstraints = fEnforce;
}
internal void MergeTable(DataTable src) {
bool fEnforce = false;
if (!isStandAlonetable) {
if (src.DataSet == dataSet) return; //somebody is doing an 'automerge'
fEnforce = dataSet.EnforceConstraints;
dataSet.EnforceConstraints = false;
}
else {
if (src == dataTable) return; //somebody is doing an 'automerge'
dataTable.SuspendEnforceConstraints = true;
}
if (this.dataSet != null) { // this is ds.Merge
// if source does not have a DS, or if NS of both DS does not match, ignore the NS
if (src.DataSet == null || src.DataSet.namespaceURI != this.dataSet.namespaceURI) {
_IgnoreNSforTableLookup = true;
}
}
else { // this is dt.Merge
if (this.dataTable.DataSet == null || src.DataSet == null ||
src.DataSet.namespaceURI != this.dataTable.DataSet.namespaceURI) {
_IgnoreNSforTableLookup = true;
}
}
MergeTableData(src);
DataTable dt = dataTable;
if (dt == null && dataSet != null) {
if (_IgnoreNSforTableLookup) {
dt = dataSet.Tables[src.TableName];
}
else {
dt = dataSet.Tables[src.TableName, src.Namespace];
}
}
if (dt != null) {
dt.EvaluateExpressions();
}
if (!isStandAlonetable) {
dataSet.EnforceConstraints = fEnforce;
}
else {
dataTable.SuspendEnforceConstraints = false;
try {
if (dataTable.EnforceConstraints) {
dataTable.EnableConstraints();
}
}
catch(ConstraintException) {
if (dataTable.DataSet != null) {
dataTable.DataSet.EnforceConstraints = false;
}
throw;
}
}
}
private void MergeTable(DataTable src, DataTable dst) {
int rowsCount = src.Rows.Count;
bool wasEmpty = dst.Rows.Count == 0;
if(0 < rowsCount) {
Index ndxSearch = null;
DataKey key = default(DataKey);
dst.SuspendIndexEvents();
try {
if(! wasEmpty && dst.primaryKey != null) {
key = GetSrcKey(src, dst);
if (key.HasValue)
ndxSearch = dst.primaryKey.Key.GetSortIndex(DataViewRowState.OriginalRows | DataViewRowState.Added );
}
// SQLBU 414992: Serious performance issue when calling Merge
// this improves performance by iterating over the rows instead of computing their position
foreach(DataRow sourceRow in src.Rows) {
DataRow targetRow = null;
if(ndxSearch != null) {
targetRow = dst.FindMergeTarget(sourceRow, key, ndxSearch);
}
dst.MergeRow(sourceRow, targetRow, preserveChanges, ndxSearch);
}
}
finally {
dst.RestoreIndexEvents(true);
}
}
MergeExtendedProperties(src.ExtendedProperties, dst.ExtendedProperties);
}
internal void MergeRows(DataRow[] rows) {
DataTable src = null;
DataTable dst = null;
DataKey key = default(DataKey);
Index ndxSearch = null;
bool fEnforce = dataSet.EnforceConstraints;
dataSet.EnforceConstraints = false;
for (int i = 0; i < rows.Length; i++) {
DataRow row = rows[i];
if (row == null) {
throw ExceptionBuilder.ArgumentNull("rows[" + i + "]");
}
if (row.Table == null) {
throw ExceptionBuilder.ArgumentNull("rows[" + i + "].Table");
}
//somebody is doing an 'automerge'
if (row.Table.DataSet == dataSet)
continue;
if (src != row.Table) { // row.Table changed from prev. row.
src = row.Table;
dst = MergeSchema(row.Table);
if (dst == null) {
Debug.Assert(MissingSchemaAction.Ignore == missingSchemaAction, "MergeSchema failed");
dataSet.EnforceConstraints = fEnforce;
return;
}
if(dst.primaryKey != null) {
key = GetSrcKey(src, dst);
}
if (key.HasValue) {
// Getting our own copy instead. ndxSearch = dst.primaryKey.Key.GetSortIndex();
// IMO, Better would be to reuse index
// ndxSearch = dst.primaryKey.Key.GetSortIndex(DataViewRowState.OriginalRows | DataViewRowState.Added );
if (null != ndxSearch) {
ndxSearch.RemoveRef();
ndxSearch = null;
}
ndxSearch = new Index(dst, dst.primaryKey.Key.GetIndexDesc(), DataViewRowState.OriginalRows | DataViewRowState.Added, (IFilter)null);
ndxSearch.AddRef(); // need to addref twice, otherwise it will be collected
ndxSearch.AddRef(); // in past first adref was done in const
}
}
if (row.newRecord == -1 && row.oldRecord == -1)
continue;
DataRow targetRow = null;
if(0 < dst.Rows.Count && ndxSearch != null) {
targetRow = dst.FindMergeTarget(row, key, ndxSearch);
}
targetRow = dst.MergeRow(row, targetRow, preserveChanges, ndxSearch);
if (targetRow.Table.dependentColumns != null && targetRow.Table.dependentColumns.Count > 0)
targetRow.Table.EvaluateExpressions(targetRow, DataRowAction.Change, null);
}
if (null != ndxSearch) {
ndxSearch.RemoveRef();
ndxSearch = null;
}
dataSet.EnforceConstraints = fEnforce;
}
private DataTable MergeSchema(DataTable table) {
DataTable targetTable = null;
if (!isStandAlonetable) {
if (dataSet.Tables.Contains(table.TableName, true))
if (_IgnoreNSforTableLookup) {
targetTable = dataSet.Tables[table.TableName];
}
else {
targetTable = dataSet.Tables[table.TableName, table.Namespace];
}
}
else {
targetTable = dataTable;
}
if (targetTable == null) { // in case of standalone table, we make sure that targetTable is not null, so if this check passes, it will be when it is called via detaset
if (MissingSchemaAction.Add == missingSchemaAction) {
targetTable = table.Clone(table.DataSet); // if we are here mainly we are called from DataSet.Merge at this point we don't set
//expression columns, since it might have refer to other columns via relation, so it wont find the table and we get exception;
// do it after adding relations.
dataSet.Tables.Add(targetTable);
}
else if (MissingSchemaAction.Error == missingSchemaAction) {
throw ExceptionBuilder.MergeMissingDefinition(table.TableName);
}
}
else {
if (MissingSchemaAction.Ignore != missingSchemaAction) {
// Do the columns
int oldCount = targetTable.Columns.Count;
for (int i = 0; i < table.Columns.Count; i++) {
DataColumn src = table.Columns[i];
DataColumn dest = (targetTable.Columns.Contains(src.ColumnName, true)) ? targetTable.Columns[src.ColumnName] : null;
if (dest == null) {
if (MissingSchemaAction.Add == missingSchemaAction) {
dest = src.Clone();
targetTable.Columns.Add(dest);
}
else {
if (!isStandAlonetable)
dataSet.RaiseMergeFailed(targetTable, Res.GetString(Res.DataMerge_MissingColumnDefinition, table.TableName, src.ColumnName), missingSchemaAction);
else
throw ExceptionBuilder.MergeFailed(Res.GetString(Res.DataMerge_MissingColumnDefinition, table.TableName, src.ColumnName));
}
}
else {
if (dest.DataType != src.DataType ||
((dest.DataType == typeof(DateTime)) && (dest.DateTimeMode != src.DateTimeMode) && ((dest.DateTimeMode & src.DateTimeMode) != DataSetDateTime.Unspecified))) {
if (!isStandAlonetable)
dataSet.RaiseMergeFailed(targetTable, Res.GetString(Res.DataMerge_DataTypeMismatch, src.ColumnName), MissingSchemaAction.Error);
else
throw ExceptionBuilder.MergeFailed(Res.GetString(Res.DataMerge_DataTypeMismatch, src.ColumnName));
}
//
MergeExtendedProperties(src.ExtendedProperties, dest.ExtendedProperties);
}
}
// Set DataExpression
if (isStandAlonetable) {
for (int i = oldCount; i < targetTable.Columns.Count; i++) {
targetTable.Columns[i].Expression = table.Columns[targetTable.Columns[i].ColumnName].Expression;
}
}
// check the PrimaryKey
DataColumn[] targetPKey = targetTable.PrimaryKey;
DataColumn[] tablePKey = table.PrimaryKey;
if (targetPKey.Length != tablePKey.Length) {
// special case when the target table does not have the PrimaryKey
if (targetPKey.Length == 0) {
DataColumn[] key = new DataColumn[tablePKey.Length];
for (int i = 0; i < tablePKey.Length; i++) {
key[i] = targetTable.Columns[tablePKey[i].ColumnName];
}
targetTable.PrimaryKey = key;
}
else if (tablePKey.Length != 0) {
dataSet.RaiseMergeFailed(targetTable, Res.GetString(Res.DataMerge_PrimaryKeyMismatch), missingSchemaAction);
}
}
else {
for (int i = 0; i < targetPKey.Length; i++) {
if (String.Compare(targetPKey[i].ColumnName, tablePKey[i].ColumnName, false, targetTable.Locale) != 0) {
dataSet.RaiseMergeFailed(table,
Res.GetString(Res.DataMerge_PrimaryKeyColumnsMismatch, targetPKey[i].ColumnName, tablePKey[i].ColumnName),
missingSchemaAction
);
}
}
}
}
MergeExtendedProperties(table.ExtendedProperties, targetTable.ExtendedProperties);
}
return targetTable;
}
private void MergeTableData(DataTable src) {
DataTable dest = MergeSchema(src);
if (dest == null) return;
dest.MergingData = true;
try {
MergeTable(src, dest);
}
finally {
dest.MergingData = false;
}
}
private void MergeConstraints(DataSet source) {
for (int i = 0; i < source.Tables.Count; i ++) {
MergeConstraints(source.Tables[i]);
}
}
private void MergeConstraints(DataTable table) {
// Merge constraints
for (int i = 0; i < table.Constraints.Count; i++) {
Constraint src = table.Constraints[i];
Constraint dest = src.Clone(dataSet, _IgnoreNSforTableLookup);
if (dest == null) {
dataSet.RaiseMergeFailed(table,
Res.GetString(Res.DataMerge_MissingConstraint, src.GetType().FullName, src.ConstraintName),
missingSchemaAction
);
}
else {
Constraint cons = dest.Table.Constraints.FindConstraint(dest);
if (cons == null) {
if (MissingSchemaAction.Add == missingSchemaAction) {
try {
// try to keep the original name
dest.Table.Constraints.Add(dest);
}
catch (DuplicateNameException) {
// if fail, assume default name
dest.ConstraintName = "";
dest.Table.Constraints.Add(dest);
}
}
else if (MissingSchemaAction.Error == missingSchemaAction) {
dataSet.RaiseMergeFailed(table,
Res.GetString(Res.DataMerge_MissingConstraint, src.GetType().FullName, src.ConstraintName),
missingSchemaAction
);
}
}
else {
MergeExtendedProperties(src.ExtendedProperties, cons.ExtendedProperties);
}
}
}
}
private void MergeRelation(DataRelation relation) {
Debug.Assert(MissingSchemaAction.Error == missingSchemaAction ||
MissingSchemaAction.Add == missingSchemaAction,
"Unexpected value of MissingSchemaAction parameter : " + ((Enum) missingSchemaAction).ToString());
DataRelation destRelation = null;
// try to find given relation in this dataSet
int iDest = dataSet.Relations.InternalIndexOf(relation.RelationName);
if (iDest >= 0) {
// check the columns and Relation properties..
destRelation = dataSet.Relations[iDest];
if (relation.ParentKey.ColumnsReference.Length != destRelation.ParentKey.ColumnsReference.Length) {
dataSet.RaiseMergeFailed(null,
Res.GetString(Res.DataMerge_MissingDefinition, relation.RelationName),
missingSchemaAction
);
}
for (int i = 0; i < relation.ParentKey.ColumnsReference.Length; i++) {
DataColumn dest = destRelation.ParentKey.ColumnsReference[i];
DataColumn src = relation.ParentKey.ColumnsReference[i];
if (0 != string.Compare(dest.ColumnName, src.ColumnName, false, dest.Table.Locale)) {
dataSet.RaiseMergeFailed(null,
Res.GetString(Res.DataMerge_ReltionKeyColumnsMismatch, relation.RelationName),
missingSchemaAction
);
}
dest = destRelation.ChildKey.ColumnsReference[i];
src = relation.ChildKey.ColumnsReference[i];
if (0 != string.Compare(dest.ColumnName, src.ColumnName, false, dest.Table.Locale)) {
dataSet.RaiseMergeFailed(null,
Res.GetString(Res.DataMerge_ReltionKeyColumnsMismatch, relation.RelationName),
missingSchemaAction
);
}
}
}
else {
if (MissingSchemaAction.Add == missingSchemaAction) {
// create identical realtion in the current dataset
DataTable parent;
if (_IgnoreNSforTableLookup){
parent = dataSet.Tables[relation.ParentTable.TableName];
}
else {
parent = dataSet.Tables[relation.ParentTable.TableName, relation.ParentTable.Namespace];
}
DataTable child;
if (_IgnoreNSforTableLookup) {
child = dataSet.Tables[relation.ChildTable.TableName];
}
else {
child = dataSet.Tables[relation.ChildTable.TableName,relation.ChildTable.Namespace];
}
DataColumn[] parentColumns = new DataColumn[relation.ParentKey.ColumnsReference.Length];
DataColumn[] childColumns = new DataColumn[relation.ParentKey.ColumnsReference.Length];
for (int i = 0; i < relation.ParentKey.ColumnsReference.Length; i++) {
parentColumns[i] = parent.Columns[relation.ParentKey.ColumnsReference[i].ColumnName];
childColumns[i] = child.Columns[relation.ChildKey.ColumnsReference[i].ColumnName];
}
try {
destRelation = new DataRelation(relation.RelationName, parentColumns, childColumns, relation.createConstraints);
destRelation.Nested = relation.Nested;
dataSet.Relations.Add(destRelation);
}
catch (Exception e) {
//
if (!Common.ADP.IsCatchableExceptionType(e)) {
throw;
}
ExceptionBuilder.TraceExceptionForCapture(e);
dataSet.RaiseMergeFailed(null, e.Message, missingSchemaAction);
}
}
else {
Debug.Assert(MissingSchemaAction.Error == missingSchemaAction, "Unexpected value of MissingSchemaAction parameter : " + ((Enum) missingSchemaAction).ToString());
throw ExceptionBuilder.MergeMissingDefinition(relation.RelationName);
}
}
MergeExtendedProperties(relation.ExtendedProperties, destRelation.ExtendedProperties);
return;
}
private void MergeExtendedProperties(PropertyCollection src, PropertyCollection dst) {
if (MissingSchemaAction.Ignore == missingSchemaAction) {
return;
}
IDictionaryEnumerator srcDE = src.GetEnumerator();
while (srcDE.MoveNext()) {
if (!preserveChanges || dst[srcDE.Key] == null)
dst[srcDE.Key] = srcDE.Value;
}
}
private DataKey GetSrcKey(DataTable src, DataTable dst) {
if (src.primaryKey != null)
return src.primaryKey.Key;
DataKey key = default(DataKey);
if (dst.primaryKey != null) {
DataColumn[] dstColumns = dst.primaryKey.Key.ColumnsReference;
DataColumn[] srcColumns = new DataColumn[dstColumns.Length];
for (int j = 0; j < dstColumns.Length; j++) {
srcColumns[j] = src.Columns[dstColumns[j].ColumnName];
}
key = new DataKey(srcColumns, false); // DataKey will take ownership of srcColumns
}
return key;
}
}
}
|