659 lines
20 KiB
C#
659 lines
20 KiB
C#
//
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// System.Data.Common.DataAdapter
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//
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// Author:
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// Rodrigo Moya (rodrigo@ximian.com)
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// Tim Coleman (tim@timcoleman.com)
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//
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// (C) Ximian, Inc
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// Copyright (C) Tim Coleman, 2002-2003
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//
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//
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// Copyright (C) 2004 Novell, Inc (http://www.novell.com)
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//
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// Permission is hereby granted, free of charge, to any person obtaining
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// a copy of this software and associated documentation files (the
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// "Software"), to deal in the Software without restriction, including
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// without limitation the rights to use, copy, modify, merge, publish,
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// distribute, sublicense, and/or sell copies of the Software, and to
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// permit persons to whom the Software is furnished to do so, subject to
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// the following conditions:
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//
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// The above copyright notice and this permission notice shall be
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// included in all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
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// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
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// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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//
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using System;
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using System.Data;
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using System.Collections;
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using System.ComponentModel;
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namespace System.Data.Common
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{
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/// <summary>
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/// Represents a set of data commands and a database connection that are used to fill the DataSet and update the data source.
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/// </summary>
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public
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#if ONLY_1_1
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abstract
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#endif
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class DataAdapter : Component, IDataAdapter
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{
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#region Fields
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private bool acceptChangesDuringFill;
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private bool continueUpdateOnError;
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private MissingMappingAction missingMappingAction;
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private MissingSchemaAction missingSchemaAction;
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private DataTableMappingCollection tableMappings;
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private const string DefaultSourceTableName = "Table";
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private const string DefaultSourceColumnName = "Column";
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#if NET_2_0
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private bool acceptChangesDuringUpdate;
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private LoadOption fillLoadOption;
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private bool returnProviderSpecificTypes;
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#endif
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#endregion
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#region Constructors
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protected DataAdapter ()
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{
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acceptChangesDuringFill = true;
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continueUpdateOnError = false;
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missingMappingAction = MissingMappingAction.Passthrough;
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missingSchemaAction = MissingSchemaAction.Add;
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tableMappings = new DataTableMappingCollection ();
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#if NET_2_0
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acceptChangesDuringUpdate = true;
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fillLoadOption = LoadOption.OverwriteChanges;
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returnProviderSpecificTypes = false;
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#endif
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}
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protected DataAdapter (DataAdapter from)
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{
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AcceptChangesDuringFill = from.AcceptChangesDuringFill;
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ContinueUpdateOnError = from.ContinueUpdateOnError;
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MissingMappingAction = from.MissingMappingAction;
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MissingSchemaAction = from.MissingSchemaAction;
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if (from.tableMappings != null)
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foreach (ICloneable cloneable in from.TableMappings)
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TableMappings.Add (cloneable.Clone ());
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#if NET_2_0
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acceptChangesDuringUpdate = from.AcceptChangesDuringUpdate;
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fillLoadOption = from.FillLoadOption;
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returnProviderSpecificTypes = from.ReturnProviderSpecificTypes;
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#endif
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}
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#endregion
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#region Properties
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[DataCategory ("Fill")]
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#if !NET_2_0
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[DataSysDescription ("Whether or not Fill will call DataRow.AcceptChanges.")]
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#endif
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[DefaultValue (true)]
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public bool AcceptChangesDuringFill {
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get { return acceptChangesDuringFill; }
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set { acceptChangesDuringFill = value; }
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}
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#if NET_2_0
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[DefaultValue (true)]
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public bool AcceptChangesDuringUpdate {
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get { return acceptChangesDuringUpdate; }
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set { acceptChangesDuringUpdate = value; }
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}
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#endif
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[DataCategory ("Update")]
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#if !NET_2_0
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[DataSysDescription ("Whether or not to continue to the next DataRow when the Update events, RowUpdating and RowUpdated, Status is UpdateStatus.ErrorsOccurred.")]
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#endif
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[DefaultValue (false)]
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public bool ContinueUpdateOnError {
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get { return continueUpdateOnError; }
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set { continueUpdateOnError = value; }
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}
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#if NET_2_0
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[RefreshProperties (RefreshProperties.All)]
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public LoadOption FillLoadOption {
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get { return fillLoadOption; }
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set {
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ExceptionHelper.CheckEnumValue (typeof (LoadOption), value);
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fillLoadOption = value;
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}
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}
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#endif
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ITableMappingCollection IDataAdapter.TableMappings {
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get { return TableMappings; }
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}
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[DataCategory ("Mapping")]
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#if !NET_2_0
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[DataSysDescription ("The action taken when a table or column in the TableMappings is missing.")]
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#endif
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[DefaultValue (MissingMappingAction.Passthrough)]
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public MissingMappingAction MissingMappingAction {
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get { return missingMappingAction; }
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set {
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ExceptionHelper.CheckEnumValue (typeof (MissingMappingAction), value);
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missingMappingAction = value;
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}
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}
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[DataCategory ("Mapping")]
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#if !NET_2_0
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[DataSysDescription ("The action taken when a table or column in the DataSet is missing.")]
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#endif
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[DefaultValue (MissingSchemaAction.Add)]
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public MissingSchemaAction MissingSchemaAction {
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get { return missingSchemaAction; }
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set {
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ExceptionHelper.CheckEnumValue (typeof (MissingSchemaAction), value);
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missingSchemaAction = value;
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}
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}
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#if NET_2_0
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[DefaultValue (false)]
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public virtual bool ReturnProviderSpecificTypes {
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get { return returnProviderSpecificTypes; }
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set { returnProviderSpecificTypes = value; }
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}
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#endif
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[DataCategory ("Mapping")]
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#if !NET_2_0
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[DataSysDescription ("How to map source table to DataSet table.")]
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#endif
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[DesignerSerializationVisibility (DesignerSerializationVisibility.Content)]
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public DataTableMappingCollection TableMappings {
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get { return tableMappings; }
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}
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#endregion
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#region Events
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#if NET_2_0
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public event FillErrorEventHandler FillError;
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#endif
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#endregion
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#region Methods
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[Obsolete ("Use the protected constructor instead")]
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[MonoTODO]
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protected virtual DataAdapter CloneInternals ()
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{
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throw new NotImplementedException ();
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}
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protected virtual DataTableMappingCollection CreateTableMappings ()
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{
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return new DataTableMappingCollection ();
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}
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[MonoTODO]
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protected override void Dispose (bool disposing)
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{
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}
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protected virtual bool ShouldSerializeTableMappings ()
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{
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return true;
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}
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internal int FillInternal (DataTable dataTable, IDataReader dataReader)
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{
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if (dataReader.FieldCount == 0) {
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dataReader.Close ();
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return 0;
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}
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int count = 0;
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try {
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string tableName = SetupSchema (SchemaType.Mapped, dataTable.TableName);
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if (tableName != null) {
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dataTable.TableName = tableName;
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FillTable (dataTable, dataReader, 0, 0, ref count);
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}
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} finally {
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dataReader.Close ();
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}
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return count;
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}
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// this method builds the schema for a given datatable. it returns a int array with
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// "array[ordinal of datatable column] == index of source column in data reader".
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// each column in the datatable has a mapping to a specific column in the datareader,
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// the int array represents this match.
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internal int[] BuildSchema (IDataReader reader, DataTable table, SchemaType schemaType)
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{
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return BuildSchema (reader, table, schemaType, MissingSchemaAction,
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MissingMappingAction, TableMappings);
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}
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/// <summary>
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/// Creates or Modifies the schema of the given DataTable based on the schema of
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/// the reader and the arguments passed.
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/// </summary>
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internal static int[] BuildSchema (IDataReader reader, DataTable table,
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SchemaType schemaType,
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MissingSchemaAction missingSchAction,
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MissingMappingAction missingMapAction,
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DataTableMappingCollection dtMapping
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)
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{
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int readerIndex = 0;
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// FIXME : this fails if query has fewer columns than a table
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int[] mapping = new int[table.Columns.Count]; // mapping the reader indexes to the datatable indexes
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for(int i=0; i < mapping.Length; i++) {
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mapping[i] = -1;
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}
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ArrayList primaryKey = new ArrayList ();
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ArrayList sourceColumns = new ArrayList ();
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bool createPrimaryKey = true;
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DataTable schemaTable = reader.GetSchemaTable ();
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DataColumn ColumnNameCol = schemaTable.Columns["ColumnName"];
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DataColumn DataTypeCol = schemaTable.Columns["DataType"];
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DataColumn IsAutoIncrementCol = schemaTable.Columns["IsAutoIncrement"];
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DataColumn AllowDBNullCol = schemaTable.Columns["AllowDBNull"];
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DataColumn IsReadOnlyCol = schemaTable.Columns["IsReadOnly"];
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DataColumn IsKeyCol = schemaTable.Columns["IsKey"];
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DataColumn IsUniqueCol = schemaTable.Columns["IsUnique"];
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DataColumn ColumnSizeCol = schemaTable.Columns["ColumnSize"];
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foreach (DataRow schemaRow in schemaTable.Rows) {
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// generate a unique column name in the source table.
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string sourceColumnName;
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string realSourceColumnName ;
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if (ColumnNameCol == null || schemaRow.IsNull(ColumnNameCol) ||
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(string)schemaRow [ColumnNameCol] == String.Empty) {
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sourceColumnName = DefaultSourceColumnName;
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realSourceColumnName = DefaultSourceColumnName + "1";
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} else {
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sourceColumnName = (string) schemaRow [ColumnNameCol];
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realSourceColumnName = sourceColumnName;
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}
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for (int i = 1; sourceColumns.Contains (realSourceColumnName); i += 1)
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realSourceColumnName = String.Format ("{0}{1}", sourceColumnName, i);
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sourceColumns.Add(realSourceColumnName);
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// generate DataSetColumnName from DataTableMapping, if any
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DataTableMapping tableMapping = null;
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//FIXME : The sourcetable name shud get passed as a parameter..
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int index = dtMapping.IndexOfDataSetTable (table.TableName);
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string srcTable = (index != -1 ? dtMapping[index].SourceTable : table.TableName);
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tableMapping = DataTableMappingCollection.GetTableMappingBySchemaAction (dtMapping, srcTable, table.TableName, missingMapAction);
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if (tableMapping != null) {
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table.TableName = tableMapping.DataSetTable;
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// check to see if the column mapping exists
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DataColumnMapping columnMapping = DataColumnMappingCollection.GetColumnMappingBySchemaAction(tableMapping.ColumnMappings, realSourceColumnName, missingMapAction);
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if (columnMapping != null) {
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Type columnType = schemaRow[DataTypeCol] as Type;
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DataColumn col = columnType != null ? columnMapping.GetDataColumnBySchemaAction(
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table ,
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columnType,
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missingSchAction) : null;
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if (col != null) {
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// if the column is not in the table - add it.
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if (table.Columns.IndexOf(col) == -1) {
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if (missingSchAction == MissingSchemaAction.Add
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|| missingSchAction == MissingSchemaAction.AddWithKey)
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table.Columns.Add(col);
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int[] tmp = new int[mapping.Length + 1];
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Array.Copy(mapping,0,tmp,0,col.Ordinal);
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Array.Copy(mapping,col.Ordinal,tmp,col.Ordinal + 1,mapping.Length - col.Ordinal);
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mapping = tmp;
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}
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if (missingSchAction == MissingSchemaAction.AddWithKey) {
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object value = (AllowDBNullCol != null) ? schemaRow[AllowDBNullCol] : null;
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bool allowDBNull = value is bool ? (bool)value : true;
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value = (IsKeyCol != null) ? schemaRow[IsKeyCol] : null;
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bool isKey = value is bool ? (bool)value : false;
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value = (IsAutoIncrementCol != null) ? schemaRow[IsAutoIncrementCol] : null;
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bool isAutoIncrement = value is bool ? (bool)value : false;
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value = (IsReadOnlyCol != null) ? schemaRow[IsReadOnlyCol] : null;
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bool isReadOnly = value is bool ? (bool)value : false;
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value = (IsUniqueCol != null) ? schemaRow[IsUniqueCol] : null;
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bool isUnique = value is bool ? (bool)value : false;
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col.AllowDBNull = allowDBNull;
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// fill woth key info
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if (isAutoIncrement && DataColumn.CanAutoIncrement(columnType)) {
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col.AutoIncrement = true;
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if (!allowDBNull)
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col.AllowDBNull = false;
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}
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if (columnType == DbTypes.TypeOfString) {
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col.MaxLength = (ColumnSizeCol != null) ? (int)schemaRow[ColumnSizeCol] : 0;
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}
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if (isReadOnly)
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col.ReadOnly = true;
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if (!allowDBNull && (!isReadOnly || isKey))
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col.AllowDBNull = false;
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if (isUnique && !isKey && !columnType.IsArray) {
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col.Unique = true;
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if (!allowDBNull)
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col.AllowDBNull = false;
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}
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// This might not be set by all DataProviders
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bool isHidden = false;
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if (schemaTable.Columns.Contains ("IsHidden")) {
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value = schemaRow["IsHidden"];
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isHidden = ((value is bool) ? (bool)value : false);
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}
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if (isKey && !isHidden) {
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primaryKey.Add (col);
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if (allowDBNull)
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createPrimaryKey = false;
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}
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}
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// add the ordinal of the column as a key and the index of the column in the datareader as a value.
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mapping[col.Ordinal] = readerIndex++;
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}
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}
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}
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}
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if (primaryKey.Count > 0) {
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DataColumn[] colKey = (DataColumn[])(primaryKey.ToArray(typeof (DataColumn)));
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if (createPrimaryKey)
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table.PrimaryKey = colKey;
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else {
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UniqueConstraint uConstraint = new UniqueConstraint(colKey);
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for (int i = 0; i < table.Constraints.Count; i++) {
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if (table.Constraints[i].Equals(uConstraint)) {
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uConstraint = null;
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break;
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}
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}
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if (uConstraint != null)
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table.Constraints.Add(uConstraint);
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}
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}
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return mapping;
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}
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internal bool FillTable (DataTable dataTable, IDataReader dataReader, int startRecord, int maxRecords, ref int counter)
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{
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if (dataReader.FieldCount == 0)
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return false;
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int counterStart = counter;
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int[] mapping = BuildSchema (dataReader, dataTable, SchemaType.Mapped);
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int [] sortedMapping = new int [mapping.Length];
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int length = sortedMapping.Length;
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for (int i = 0; i < sortedMapping.Length; i++) {
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if (mapping [i] >= 0)
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sortedMapping [mapping [i]] = i;
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else
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sortedMapping [--length] = i;
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}
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for (int i = 0; i < startRecord; i++) {
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dataReader.Read ();
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}
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dataTable.BeginLoadData ();
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while (dataReader.Read () && (maxRecords == 0 || (counter - counterStart) < maxRecords)) {
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try {
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dataTable.LoadDataRow (dataReader, sortedMapping, length, AcceptChangesDuringFill);
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counter++;
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}
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catch (Exception e) {
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object[] readerArray = new object [dataReader.FieldCount];
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object[] tableArray = new object [mapping.Length];
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// we get the values from the datareader
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dataReader.GetValues (readerArray);
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// copy from datareader columns to table columns according to given mapping
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for (int i = 0; i < mapping.Length; i++) {
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if (mapping [i] >= 0) {
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tableArray [i] = readerArray [mapping [i]];
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}
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}
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FillErrorEventArgs args = CreateFillErrorEvent (dataTable, tableArray, e);
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OnFillErrorInternal (args);
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// if args.Continue is not set to true or if a handler is not set, rethrow the error..
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if(!args.Continue)
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throw e;
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}
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}
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dataTable.EndLoadData ();
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return true;
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}
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internal virtual void OnFillErrorInternal (FillErrorEventArgs value)
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{
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#if NET_2_0
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OnFillError (value);
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#endif
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}
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internal FillErrorEventArgs CreateFillErrorEvent (DataTable dataTable, object[] values, Exception e)
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{
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FillErrorEventArgs args = new FillErrorEventArgs (dataTable, values);
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args.Errors = e;
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args.Continue = false;
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return args;
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}
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internal string SetupSchema (SchemaType schemaType, string sourceTableName)
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{
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DataTableMapping tableMapping = null;
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if (schemaType == SchemaType.Mapped) {
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tableMapping = DataTableMappingCollection.GetTableMappingBySchemaAction (TableMappings, sourceTableName, sourceTableName, MissingMappingAction);
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if (tableMapping != null)
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return tableMapping.DataSetTable;
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return null;
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} else
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return sourceTableName;
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}
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internal int FillInternal (DataSet dataSet, string srcTable, IDataReader dataReader, int startRecord, int maxRecords)
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{
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if (dataSet == null)
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throw new ArgumentNullException ("DataSet");
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if (startRecord < 0)
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throw new ArgumentException ("The startRecord parameter was less than 0.");
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if (maxRecords < 0)
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throw new ArgumentException ("The maxRecords parameter was less than 0.");
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DataTable dataTable = null;
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int resultIndex = 0;
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int count = 0;
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try {
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string tableName = srcTable;
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do {
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// Non-resultset queries like insert, delete or update aren't processed.
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if (dataReader.FieldCount != -1) {
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tableName = SetupSchema (SchemaType.Mapped, tableName);
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if (tableName != null) {
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// check if the table exists in the dataset
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if (dataSet.Tables.Contains (tableName))
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// get the table from the dataset
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dataTable = dataSet.Tables [tableName];
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else {
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// Do not create schema if MissingSchemAction is set to Ignore
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if (this.MissingSchemaAction == MissingSchemaAction.Ignore)
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continue;
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dataTable = dataSet.Tables.Add (tableName);
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}
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if (!FillTable (dataTable, dataReader, startRecord, maxRecords, ref count))
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continue;
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tableName = String.Format ("{0}{1}", srcTable, ++resultIndex);
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startRecord = 0;
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maxRecords = 0;
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}
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}
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} while (dataReader.NextResult ());
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} finally {
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dataReader.Close ();
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}
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return count;
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}
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#if NET_2_0
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public virtual int Fill (DataSet dataSet)
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{
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throw new NotSupportedException();
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}
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protected virtual int Fill (DataTable dataTable, IDataReader dataReader)
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{
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return FillInternal (dataTable, dataReader);
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}
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protected virtual int Fill (DataTable[] dataTables, IDataReader dataReader, int startRecord, int maxRecords)
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{
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int count = 0;
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if (dataReader.IsClosed)
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return 0;
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if (startRecord < 0)
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throw new ArgumentException ("The startRecord parameter was less than 0.");
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if (maxRecords < 0)
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throw new ArgumentException ("The maxRecords parameter was less than 0.");
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try {
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foreach (DataTable dataTable in dataTables) {
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string tableName = SetupSchema (SchemaType.Mapped, dataTable.TableName);
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if (tableName != null) {
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dataTable.TableName = tableName;
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FillTable (dataTable, dataReader, 0, 0, ref count);
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}
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}
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} finally {
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dataReader.Close ();
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}
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return count;
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}
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protected virtual int Fill (DataSet dataSet, string srcTable, IDataReader dataReader, int startRecord, int maxRecords)
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{
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return FillInternal (dataSet, srcTable, dataReader, startRecord, maxRecords);
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}
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[MonoTODO]
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protected virtual DataTable FillSchema (DataTable dataTable, SchemaType schemaType, IDataReader dataReader)
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{
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throw new NotImplementedException ();
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}
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[MonoTODO]
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protected virtual DataTable[] FillSchema (DataSet dataSet, SchemaType schemaType, string srcTable, IDataReader dataReader)
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{
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throw new NotImplementedException ();
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}
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public virtual DataTable[] FillSchema (DataSet dataSet, SchemaType schemaType)
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{
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throw new NotSupportedException ();
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}
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[MonoTODO]
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[EditorBrowsable (EditorBrowsableState.Advanced)]
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public virtual IDataParameter[] GetFillParameters ()
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{
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throw new NotImplementedException ();
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}
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protected bool HasTableMappings ()
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{
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return (TableMappings.Count != 0);
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}
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protected virtual void OnFillError (FillErrorEventArgs value)
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{
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if (FillError != null)
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FillError (this, value);
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}
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[EditorBrowsable (EditorBrowsableState.Never)]
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public void ResetFillLoadOption ()
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{
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//FIXME: what else ??
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FillLoadOption = LoadOption.OverwriteChanges;
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}
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[EditorBrowsable (EditorBrowsableState.Never)]
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public virtual bool ShouldSerializeAcceptChangesDuringFill ()
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{
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return true;
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}
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[EditorBrowsable (EditorBrowsableState.Never)]
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public virtual bool ShouldSerializeFillLoadOption ()
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{
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return false;
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}
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[MonoTODO]
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public virtual int Update (DataSet dataSet)
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{
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throw new NotImplementedException ();
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}
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#else
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public abstract int Fill (DataSet dataSet);
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public abstract DataTable[] FillSchema (DataSet dataSet, SchemaType schemaType);
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public abstract IDataParameter[] GetFillParameters ();
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public abstract int Update (DataSet dataSet);
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#endif
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#endregion
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}
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}
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