847 lines
33 KiB
C#
847 lines
33 KiB
C#
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//------------------------------------------------------------------------------
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// <copyright file="DataTableReader.cs" company="Microsoft">
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// Copyright (c) Microsoft Corporation. All rights reserved.
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// </copyright>
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// <owner current="true" primary="true">[....]</owner>
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// <owner current="true" primary="false">[....]</owner>
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// <owner current="false" primary="false">[....]</owner>
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//------------------------------------------------------------------------------
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namespace System.Data {
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using System;
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using System.Data.Common;
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using System.Data.SqlTypes;
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using System.Collections;
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using System.ComponentModel;
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public sealed class DataTableReader : DbDataReader {
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private readonly DataTable[] tables = null;
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private bool isOpen = true;
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private DataTable schemaTable = null;
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private int tableCounter = -1;
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private int rowCounter = -1;
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private DataTable currentDataTable = null;
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private DataRow currentDataRow = null;
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private bool hasRows= true;
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private bool reachEORows = false;
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private bool currentRowRemoved = false;
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private bool schemaIsChanged = false;
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private bool started = false;
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private bool readerIsInvalid = false;
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private DataTableReaderListener listener = null;
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private bool tableCleared = false;
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public DataTableReader(DataTable dataTable) {
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if (dataTable == null)
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throw ExceptionBuilder.ArgumentNull("DataTable");
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tables = new DataTable[1] {dataTable};
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init();
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// schemaTable = GetSchemaTableFromDataTable(currentDataTable);
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}
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public DataTableReader(DataTable [] dataTables) {
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if (dataTables == null)
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throw ExceptionBuilder.ArgumentNull("DataTable");
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if (dataTables.Length == 0)
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throw ExceptionBuilder.DataTableReaderArgumentIsEmpty();
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tables = new DataTable[dataTables.Length];
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for (int i = 0; i < dataTables.Length ; i++) {
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if (dataTables[i] == null)
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throw ExceptionBuilder.ArgumentNull("DataTable");
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tables[i] = dataTables[i];
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}
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init();
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// schemaTable = GetSchemaTableFromDataTable(currentDataTable);
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}
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private bool ReaderIsInvalid {
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get {
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return readerIsInvalid;
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}
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set {
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if (readerIsInvalid == value)
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return;
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readerIsInvalid = value;
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if (readerIsInvalid && listener != null) {
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listener.CleanUp();
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}
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}
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}
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private bool IsSchemaChanged {
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get {
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return schemaIsChanged;
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}
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set {
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if (!value || schemaIsChanged == value) //once it is set to false; should not change unless in init() or NextResult()
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return;
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schemaIsChanged = value;
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if (listener != null) {
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listener.CleanUp();
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}
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}
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}
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internal DataTable CurrentDataTable {
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get {
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return currentDataTable;
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}
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}
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private void init() {
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tableCounter = 0;
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reachEORows = false;
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schemaIsChanged = false;
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currentDataTable = tables[tableCounter];
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hasRows = (currentDataTable.Rows.Count > 0);
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ReaderIsInvalid = false;
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// we need to listen to current tables event so create a listener, it will listen to events and call us back.
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listener = new DataTableReaderListener(this);
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}
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override public void Close() {
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if (!isOpen)
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return;
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// no need to listen to events after close
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if (listener != null)
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listener.CleanUp();
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listener = null;
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schemaTable = null;
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isOpen = false;
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}
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override public DataTable GetSchemaTable(){
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ValidateOpen("GetSchemaTable");
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ValidateReader();
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// each time, we just get schema table of current table for once, no need to recreate each time, if schema is changed, reader is already
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// is invalid
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if (schemaTable == null)
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schemaTable = GetSchemaTableFromDataTable(currentDataTable);
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return schemaTable;
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}
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override public bool NextResult() {
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// next result set; reset everything
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ValidateOpen("NextResult");
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if ((tableCounter == tables.Length -1))
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return false;
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currentDataTable = tables[++tableCounter];
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if (listener != null)
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listener.UpdataTable(currentDataTable); // it will unsubscribe from preveous tables events and subscribe to new table's events
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schemaTable = null;
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rowCounter = -1;
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currentRowRemoved = false;
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reachEORows = false;
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schemaIsChanged = false;
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started = false;
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ReaderIsInvalid = false;
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tableCleared = false;
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hasRows = (currentDataTable.Rows.Count > 0);
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return true;
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}
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override public bool Read() {
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/* else if (tableCleared) {
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return false;
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throw ExceptionBuilder.EmptyDataTableReader(currentDataTable.TableName);
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}
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*/
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if (!started) {
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started = true;
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}
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/*else {
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ValidateRow(rowCounter);
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}*/
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ValidateOpen("Read");
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ValidateReader();
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if(reachEORows) {
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return false;
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}
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if (rowCounter >= currentDataTable.Rows.Count -1 ) {
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reachEORows = true;
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if (listener != null)
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listener.CleanUp();
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return false;
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}
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rowCounter ++;
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ValidateRow(rowCounter);
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currentDataRow = currentDataTable.Rows[rowCounter];
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while (currentDataRow.RowState == DataRowState.Deleted) {
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rowCounter++;
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if (rowCounter == currentDataTable.Rows.Count) {
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reachEORows = true;
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if (listener != null)
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listener.CleanUp();
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return false;
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}
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ValidateRow(rowCounter);
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currentDataRow = currentDataTable.Rows[rowCounter];
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}
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if (currentRowRemoved)
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currentRowRemoved = false;
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return true;
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}
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override public int Depth {
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get {
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ValidateOpen("Depth");
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ValidateReader();
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return 0;
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}
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}
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override public bool IsClosed {
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get {
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return (!isOpen);
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}
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}
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override public int RecordsAffected {
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get {
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ValidateReader();
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return 0;
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}
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}
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override public bool HasRows {
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get {
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ValidateOpen("HasRows");
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ValidateReader();
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return hasRows;
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}
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}
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override public object this[int ordinal] {
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get {
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ValidateOpen("Item");
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ValidateReader();
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if ((currentDataRow == null) || (currentDataRow.RowState == DataRowState.Deleted)) {
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ReaderIsInvalid = true;
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throw ExceptionBuilder.InvalidDataTableReader(currentDataTable.TableName);
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}
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try {
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return currentDataRow[ordinal];
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}
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catch(IndexOutOfRangeException e) { // thrown by DataColumnCollection
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ExceptionBuilder.TraceExceptionWithoutRethrow(e);
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throw ExceptionBuilder.ArgumentOutOfRange("ordinal");
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}
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}
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}
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override public object this[string name] {
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get {
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ValidateOpen("Item");
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ValidateReader();
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if ((currentDataRow == null) || (currentDataRow.RowState == DataRowState.Deleted)) {
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ReaderIsInvalid = true;
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throw ExceptionBuilder.InvalidDataTableReader(currentDataTable.TableName);
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}
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return currentDataRow[name];
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}
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}
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override public Int32 FieldCount {
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get {
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ValidateOpen("FieldCount");
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ValidateReader();
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return currentDataTable.Columns.Count;
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}
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}
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override public Type GetProviderSpecificFieldType(int ordinal) {
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ValidateOpen("GetProviderSpecificFieldType");
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ValidateReader();
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return GetFieldType(ordinal);
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}
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override public Object GetProviderSpecificValue(int ordinal) {
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ValidateOpen("GetProviderSpecificValue");
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ValidateReader();
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return GetValue(ordinal);
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}
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override public int GetProviderSpecificValues(object[] values) {
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ValidateOpen("GetProviderSpecificValues");
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ValidateReader();
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return GetValues(values);
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}
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override public bool GetBoolean (int ordinal) {
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ValidateState("GetBoolean");
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ValidateReader();
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try {
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return (bool) currentDataRow[ordinal];
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}
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catch(IndexOutOfRangeException e) { // thrown by DataColumnCollection
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ExceptionBuilder.TraceExceptionWithoutRethrow(e);
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throw ExceptionBuilder.ArgumentOutOfRange("ordinal");
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}
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}
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override public byte GetByte (int ordinal) {
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ValidateState("GetByte");
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ValidateReader();
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try {
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return (byte) currentDataRow[ordinal];
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}
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catch(IndexOutOfRangeException e) { // thrown by DataColumnCollection
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ExceptionBuilder.TraceExceptionWithoutRethrow(e);
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throw ExceptionBuilder.ArgumentOutOfRange("ordinal");
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}
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}
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override public long GetBytes(int ordinal, long dataIndex, byte[] buffer, int bufferIndex, int length) {
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ValidateState("GetBytes");
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ValidateReader();
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byte[] tempBuffer;
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try {
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tempBuffer = (byte[]) currentDataRow[ordinal];
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}
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catch(IndexOutOfRangeException e) { // thrown by DataColumnCollection
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ExceptionBuilder.TraceExceptionWithoutRethrow(e);
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throw ExceptionBuilder.ArgumentOutOfRange("ordinal");
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}
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if (buffer == null) {
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return tempBuffer.Length;
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}
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int srcIndex = (int) dataIndex;
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int byteCount = Math.Min(tempBuffer.Length - srcIndex, length);
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if (srcIndex < 0) {
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throw ADP.InvalidSourceBufferIndex(tempBuffer.Length, srcIndex, "dataIndex");
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}
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else if ((bufferIndex < 0) || (bufferIndex > 0 && bufferIndex >= buffer.Length)) {
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throw ADP.InvalidDestinationBufferIndex(buffer.Length, bufferIndex, "bufferIndex");
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}
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if (0 < byteCount) {
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Array.Copy(tempBuffer, dataIndex, buffer, bufferIndex, byteCount);
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}
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else if (length < 0) {
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throw ADP.InvalidDataLength(length);
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}
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else {
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byteCount = 0;
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}
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return byteCount;
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}
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override public char GetChar (int ordinal) {
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ValidateState("GetChar");
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ValidateReader();
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try {
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return (char) currentDataRow[ordinal];
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}
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catch(IndexOutOfRangeException e) { // thrown by DataColumnCollection
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ExceptionBuilder.TraceExceptionWithoutRethrow(e);
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throw ExceptionBuilder.ArgumentOutOfRange("ordinal");
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}
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}
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override public long GetChars(int ordinal, long dataIndex, char[] buffer, int bufferIndex, int length) {
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ValidateState("GetChars");
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ValidateReader();
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char[] tempBuffer;
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try {
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tempBuffer = (char[]) currentDataRow[ordinal];
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}
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catch(IndexOutOfRangeException e) { // thrown by DataColumnCollection
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ExceptionBuilder.TraceExceptionWithoutRethrow(e);
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throw ExceptionBuilder.ArgumentOutOfRange("ordinal");
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}
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if (buffer == null) {
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return tempBuffer.Length;
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}
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int srcIndex = (int) dataIndex;
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int charCount = Math.Min(tempBuffer.Length - srcIndex, length);
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if (srcIndex < 0) {
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throw ADP.InvalidSourceBufferIndex(tempBuffer.Length, srcIndex, "dataIndex");
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}
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else if ((bufferIndex < 0) || (bufferIndex > 0 && bufferIndex >= buffer.Length)) {
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throw ADP.InvalidDestinationBufferIndex(buffer.Length, bufferIndex, "bufferIndex");
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}
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if (0 < charCount) {
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Array.Copy(tempBuffer, dataIndex, buffer, bufferIndex, charCount);
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}
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else if (length < 0) {
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throw ADP.InvalidDataLength(length);
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}
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else {
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charCount = 0;
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}
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return charCount;
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}
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override public String GetDataTypeName (int ordinal) {
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ValidateOpen("GetDataTypeName");
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ValidateReader();
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return ((Type)GetFieldType(ordinal)).Name;
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}
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override public DateTime GetDateTime (int ordinal) {
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ValidateState("GetDateTime");
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ValidateReader();
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try {
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return (DateTime) currentDataRow[ordinal];
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}
|
||
|
|
catch(IndexOutOfRangeException e) { // thrown by DataColumnCollection
|
||
|
|
ExceptionBuilder.TraceExceptionWithoutRethrow(e);
|
||
|
|
throw ExceptionBuilder.ArgumentOutOfRange("ordinal");
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
override public Decimal GetDecimal (int ordinal) {
|
||
|
|
ValidateState("GetDecimal");
|
||
|
|
ValidateReader();
|
||
|
|
try {
|
||
|
|
return (Decimal) currentDataRow[ordinal];
|
||
|
|
}
|
||
|
|
catch(IndexOutOfRangeException e) { // thrown by DataColumnCollection
|
||
|
|
ExceptionBuilder.TraceExceptionWithoutRethrow(e);
|
||
|
|
throw ExceptionBuilder.ArgumentOutOfRange("ordinal");
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
override public Double GetDouble (int ordinal) {
|
||
|
|
ValidateState("GetDouble");
|
||
|
|
ValidateReader();
|
||
|
|
try {
|
||
|
|
return (double) currentDataRow[ordinal];
|
||
|
|
}
|
||
|
|
catch(IndexOutOfRangeException e) { // thrown by DataColumnCollection
|
||
|
|
ExceptionBuilder.TraceExceptionWithoutRethrow(e);
|
||
|
|
throw ExceptionBuilder.ArgumentOutOfRange("ordinal");
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
override public Type GetFieldType (int ordinal) {
|
||
|
|
ValidateOpen("GetFieldType");
|
||
|
|
ValidateReader();
|
||
|
|
try {
|
||
|
|
return (currentDataTable.Columns[ordinal].DataType);
|
||
|
|
}
|
||
|
|
catch(IndexOutOfRangeException e) { // thrown by DataColumnCollection
|
||
|
|
ExceptionBuilder.TraceExceptionWithoutRethrow(e);
|
||
|
|
throw ExceptionBuilder.ArgumentOutOfRange("ordinal");
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
override public Single GetFloat (int ordinal) {
|
||
|
|
ValidateState("GetFloat");
|
||
|
|
ValidateReader();
|
||
|
|
try {
|
||
|
|
return (Single) currentDataRow[ordinal];
|
||
|
|
}
|
||
|
|
catch(IndexOutOfRangeException e) { // thrown by DataColumnCollection
|
||
|
|
ExceptionBuilder.TraceExceptionWithoutRethrow(e);
|
||
|
|
throw ExceptionBuilder.ArgumentOutOfRange("ordinal");
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
override public Guid GetGuid (int ordinal) {
|
||
|
|
ValidateState("GetGuid");
|
||
|
|
ValidateReader();
|
||
|
|
try {
|
||
|
|
return (Guid) currentDataRow[ordinal];
|
||
|
|
}
|
||
|
|
catch(IndexOutOfRangeException e) { // thrown by DataColumnCollection
|
||
|
|
ExceptionBuilder.TraceExceptionWithoutRethrow(e);
|
||
|
|
throw ExceptionBuilder.ArgumentOutOfRange("ordinal");
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
override public Int16 GetInt16 (int ordinal) {
|
||
|
|
ValidateState("GetInt16");
|
||
|
|
ValidateReader();
|
||
|
|
try {
|
||
|
|
return (Int16) currentDataRow[ordinal];
|
||
|
|
}
|
||
|
|
catch(IndexOutOfRangeException e) { // thrown by DataColumnCollection
|
||
|
|
ExceptionBuilder.TraceExceptionWithoutRethrow(e);
|
||
|
|
throw ExceptionBuilder.ArgumentOutOfRange("ordinal");
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
override public Int32 GetInt32 (int ordinal) {
|
||
|
|
ValidateState("GetInt32");
|
||
|
|
ValidateReader();
|
||
|
|
try {
|
||
|
|
return (Int32) currentDataRow[ordinal];
|
||
|
|
}
|
||
|
|
catch(IndexOutOfRangeException e) { // thrown by DataColumnCollection
|
||
|
|
ExceptionBuilder.TraceExceptionWithoutRethrow(e);
|
||
|
|
throw ExceptionBuilder.ArgumentOutOfRange("ordinal");
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
override public Int64 GetInt64 (int ordinal) {
|
||
|
|
ValidateState("GetInt64");
|
||
|
|
ValidateReader();
|
||
|
|
try {
|
||
|
|
return (Int64) currentDataRow[ordinal];
|
||
|
|
}
|
||
|
|
catch(IndexOutOfRangeException e) { // thrown by DataColumnCollection
|
||
|
|
ExceptionBuilder.TraceExceptionWithoutRethrow(e);
|
||
|
|
throw ExceptionBuilder.ArgumentOutOfRange("ordinal");
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
override public String GetName (int ordinal) {
|
||
|
|
ValidateOpen("GetName");
|
||
|
|
ValidateReader();
|
||
|
|
try {
|
||
|
|
return (currentDataTable.Columns[ordinal].ColumnName);
|
||
|
|
}
|
||
|
|
catch(IndexOutOfRangeException e) { // thrown by DataColumnCollection
|
||
|
|
ExceptionBuilder.TraceExceptionWithoutRethrow(e);
|
||
|
|
throw ExceptionBuilder.ArgumentOutOfRange("ordinal");
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
override public Int32 GetOrdinal (string name) {
|
||
|
|
ValidateOpen("GetOrdinal");
|
||
|
|
ValidateReader();
|
||
|
|
DataColumn dc = currentDataTable.Columns[name];
|
||
|
|
|
||
|
|
if (dc != null) {
|
||
|
|
return dc.Ordinal;// WebData 113248
|
||
|
|
}
|
||
|
|
else{
|
||
|
|
throw ExceptionBuilder.ColumnNotInTheTable(name, currentDataTable.TableName);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
override public string GetString (int ordinal) {
|
||
|
|
ValidateState("GetString");
|
||
|
|
ValidateReader();
|
||
|
|
try {
|
||
|
|
return (string) currentDataRow[ordinal];
|
||
|
|
}
|
||
|
|
catch(IndexOutOfRangeException e) { // thrown by DataColumnCollection
|
||
|
|
ExceptionBuilder.TraceExceptionWithoutRethrow(e);
|
||
|
|
throw ExceptionBuilder.ArgumentOutOfRange("ordinal");
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
override public object GetValue (int ordinal) {
|
||
|
|
ValidateState("GetValue");
|
||
|
|
ValidateReader();
|
||
|
|
try {
|
||
|
|
return currentDataRow[ordinal];
|
||
|
|
}
|
||
|
|
catch(IndexOutOfRangeException e) { // thrown by DataColumnCollection
|
||
|
|
ExceptionBuilder.TraceExceptionWithoutRethrow(e);
|
||
|
|
throw ExceptionBuilder.ArgumentOutOfRange("ordinal");
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
override public Int32 GetValues (object[] values) {
|
||
|
|
ValidateState("GetValues");
|
||
|
|
ValidateReader();
|
||
|
|
|
||
|
|
if (values ==null)
|
||
|
|
throw ExceptionBuilder.ArgumentNull("values");
|
||
|
|
|
||
|
|
Array.Copy(currentDataRow.ItemArray, values, currentDataRow.ItemArray.Length > values.Length ? values.Length : currentDataRow.ItemArray.Length);
|
||
|
|
return (currentDataRow.ItemArray.Length > values.Length ? values.Length : currentDataRow.ItemArray.Length);
|
||
|
|
}
|
||
|
|
override public bool IsDBNull (int ordinal) {
|
||
|
|
ValidateState("IsDBNull");
|
||
|
|
ValidateReader();
|
||
|
|
try {
|
||
|
|
return (currentDataRow.IsNull(ordinal));
|
||
|
|
}
|
||
|
|
catch(IndexOutOfRangeException e) { // thrown by DataColumnCollection
|
||
|
|
ExceptionBuilder.TraceExceptionWithoutRethrow(e);
|
||
|
|
throw ExceptionBuilder.ArgumentOutOfRange("ordinal");
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
// IEnumerable
|
||
|
|
override public IEnumerator GetEnumerator() {
|
||
|
|
ValidateOpen("GetEnumerator");
|
||
|
|
return new DbEnumerator((IDataReader)this);
|
||
|
|
}
|
||
|
|
|
||
|
|
static internal DataTable GetSchemaTableFromDataTable(DataTable table) {
|
||
|
|
if (table == null) {
|
||
|
|
throw ExceptionBuilder.ArgumentNull("DataTable");
|
||
|
|
}
|
||
|
|
|
||
|
|
DataTable tempSchemaTable = new DataTable("SchemaTable");
|
||
|
|
tempSchemaTable.Locale = System.Globalization.CultureInfo.InvariantCulture;
|
||
|
|
|
||
|
|
DataColumn ColumnName = new DataColumn(SchemaTableColumn.ColumnName, typeof(System.String));
|
||
|
|
DataColumn ColumnOrdinal = new DataColumn(SchemaTableColumn.ColumnOrdinal, typeof(System.Int32));
|
||
|
|
DataColumn ColumnSize = new DataColumn(SchemaTableColumn.ColumnSize, typeof(System.Int32));
|
||
|
|
DataColumn NumericPrecision = new DataColumn(SchemaTableColumn.NumericPrecision, typeof(System.Int16));
|
||
|
|
DataColumn NumericScale = new DataColumn(SchemaTableColumn.NumericScale, typeof(System.Int16));
|
||
|
|
DataColumn DataType = new DataColumn(SchemaTableColumn.DataType, typeof(System.Type));
|
||
|
|
DataColumn ProviderType = new DataColumn(SchemaTableColumn.ProviderType, typeof(System.Int32));
|
||
|
|
DataColumn IsLong = new DataColumn(SchemaTableColumn.IsLong, typeof(System.Boolean));
|
||
|
|
DataColumn AllowDBNull = new DataColumn(SchemaTableColumn.AllowDBNull, typeof(System.Boolean));
|
||
|
|
DataColumn IsReadOnly = new DataColumn(SchemaTableOptionalColumn.IsReadOnly, typeof(System.Boolean));
|
||
|
|
DataColumn IsRowVersion = new DataColumn(SchemaTableOptionalColumn.IsRowVersion, typeof(System.Boolean));
|
||
|
|
DataColumn IsUnique = new DataColumn(SchemaTableColumn.IsUnique, typeof(System.Boolean));
|
||
|
|
DataColumn IsKeyColumn = new DataColumn(SchemaTableColumn.IsKey, typeof(System.Boolean));
|
||
|
|
DataColumn IsAutoIncrement = new DataColumn(SchemaTableOptionalColumn.IsAutoIncrement, typeof(System.Boolean));
|
||
|
|
DataColumn BaseSchemaName = new DataColumn(SchemaTableColumn.BaseSchemaName, typeof(System.String));
|
||
|
|
DataColumn BaseCatalogName = new DataColumn(SchemaTableOptionalColumn.BaseCatalogName, typeof(System.String));
|
||
|
|
DataColumn BaseTableName = new DataColumn(SchemaTableColumn.BaseTableName, typeof(System.String));
|
||
|
|
DataColumn BaseColumnName = new DataColumn(SchemaTableColumn.BaseColumnName, typeof(System.String));
|
||
|
|
DataColumn AutoIncrementSeed = new DataColumn(SchemaTableOptionalColumn.AutoIncrementSeed, typeof(System.Int64));
|
||
|
|
DataColumn AutoIncrementStep = new DataColumn(SchemaTableOptionalColumn.AutoIncrementStep, typeof(System.Int64));
|
||
|
|
DataColumn DefaultValue = new DataColumn(SchemaTableOptionalColumn.DefaultValue, typeof(System.Object));
|
||
|
|
DataColumn Expression = new DataColumn(SchemaTableOptionalColumn.Expression, typeof(System.String));
|
||
|
|
DataColumn ColumnMapping = new DataColumn(SchemaTableOptionalColumn.ColumnMapping, typeof(System.Data.MappingType));
|
||
|
|
DataColumn BaseTableNamespace = new DataColumn(SchemaTableOptionalColumn.BaseTableNamespace, typeof(System.String));
|
||
|
|
DataColumn BaseColumnNamespace = new DataColumn(SchemaTableOptionalColumn.BaseColumnNamespace, typeof(System.String));
|
||
|
|
|
||
|
|
ColumnSize.DefaultValue = -1;
|
||
|
|
|
||
|
|
if (table.DataSet != null)
|
||
|
|
BaseCatalogName.DefaultValue = table.DataSet.DataSetName;
|
||
|
|
|
||
|
|
BaseTableName.DefaultValue = table.TableName;
|
||
|
|
BaseTableNamespace.DefaultValue = table.Namespace;
|
||
|
|
IsRowVersion.DefaultValue = false;
|
||
|
|
IsLong.DefaultValue = false;
|
||
|
|
IsReadOnly.DefaultValue = false;
|
||
|
|
IsKeyColumn.DefaultValue = false;
|
||
|
|
IsAutoIncrement.DefaultValue = false;
|
||
|
|
AutoIncrementSeed.DefaultValue = 0;
|
||
|
|
AutoIncrementStep.DefaultValue = 1;
|
||
|
|
|
||
|
|
|
||
|
|
tempSchemaTable.Columns.Add(ColumnName);
|
||
|
|
tempSchemaTable.Columns.Add(ColumnOrdinal);
|
||
|
|
tempSchemaTable.Columns.Add(ColumnSize);
|
||
|
|
tempSchemaTable.Columns.Add(NumericPrecision);
|
||
|
|
tempSchemaTable.Columns.Add(NumericScale);
|
||
|
|
tempSchemaTable.Columns.Add(DataType);
|
||
|
|
tempSchemaTable.Columns.Add(ProviderType);
|
||
|
|
tempSchemaTable.Columns.Add(IsLong);
|
||
|
|
tempSchemaTable.Columns.Add(AllowDBNull);
|
||
|
|
tempSchemaTable.Columns.Add(IsReadOnly);
|
||
|
|
tempSchemaTable.Columns.Add(IsRowVersion);
|
||
|
|
tempSchemaTable.Columns.Add(IsUnique);
|
||
|
|
tempSchemaTable.Columns.Add(IsKeyColumn);
|
||
|
|
tempSchemaTable.Columns.Add(IsAutoIncrement);
|
||
|
|
tempSchemaTable.Columns.Add(BaseCatalogName);
|
||
|
|
tempSchemaTable.Columns.Add(BaseSchemaName);
|
||
|
|
// specific to datatablereader
|
||
|
|
tempSchemaTable.Columns.Add(BaseTableName);
|
||
|
|
tempSchemaTable.Columns.Add(BaseColumnName);
|
||
|
|
tempSchemaTable.Columns.Add(AutoIncrementSeed);
|
||
|
|
tempSchemaTable.Columns.Add(AutoIncrementStep);
|
||
|
|
tempSchemaTable.Columns.Add(DefaultValue);
|
||
|
|
tempSchemaTable.Columns.Add(Expression);
|
||
|
|
tempSchemaTable.Columns.Add(ColumnMapping);
|
||
|
|
tempSchemaTable.Columns.Add(BaseTableNamespace);
|
||
|
|
tempSchemaTable.Columns.Add(BaseColumnNamespace);
|
||
|
|
|
||
|
|
foreach (DataColumn dc in table.Columns) {
|
||
|
|
DataRow dr = tempSchemaTable.NewRow();
|
||
|
|
|
||
|
|
dr[ColumnName] = dc.ColumnName;
|
||
|
|
dr[ColumnOrdinal] = dc.Ordinal;
|
||
|
|
dr[DataType] = dc.DataType;
|
||
|
|
|
||
|
|
if (dc.DataType == typeof(string)) {
|
||
|
|
dr[ColumnSize] = dc.MaxLength;
|
||
|
|
}
|
||
|
|
|
||
|
|
dr[AllowDBNull] = dc.AllowDBNull;
|
||
|
|
dr[IsReadOnly] = dc.ReadOnly;
|
||
|
|
dr[IsUnique] = dc.Unique;
|
||
|
|
|
||
|
|
if (dc.AutoIncrement) {
|
||
|
|
dr[IsAutoIncrement] = true;
|
||
|
|
dr[AutoIncrementSeed] = dc.AutoIncrementSeed;
|
||
|
|
dr[AutoIncrementStep] = dc.AutoIncrementStep;
|
||
|
|
}
|
||
|
|
|
||
|
|
if (dc.DefaultValue != DBNull.Value)
|
||
|
|
dr[DefaultValue] = dc.DefaultValue;
|
||
|
|
|
||
|
|
if (dc.Expression.Length != 0) {
|
||
|
|
bool hasExternalDependency = false;
|
||
|
|
DataColumn[] dependency = dc.DataExpression.GetDependency();
|
||
|
|
for (int j = 0; j < dependency.Length; j++) {
|
||
|
|
if (dependency[j].Table != table) {
|
||
|
|
hasExternalDependency = true;
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
if (!hasExternalDependency)
|
||
|
|
dr[Expression] = dc.Expression;
|
||
|
|
}
|
||
|
|
|
||
|
|
dr[ColumnMapping] = dc.ColumnMapping;
|
||
|
|
dr[BaseColumnName] = dc.ColumnName;
|
||
|
|
dr[BaseColumnNamespace] = dc.Namespace;
|
||
|
|
|
||
|
|
tempSchemaTable.Rows.Add(dr);
|
||
|
|
}
|
||
|
|
|
||
|
|
foreach(DataColumn key in table.PrimaryKey) {
|
||
|
|
tempSchemaTable.Rows[key.Ordinal][IsKeyColumn] = true;
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
tempSchemaTable.AcceptChanges();
|
||
|
|
|
||
|
|
return tempSchemaTable;
|
||
|
|
}
|
||
|
|
|
||
|
|
private void ValidateOpen(string caller) {
|
||
|
|
if (!isOpen)
|
||
|
|
throw ADP.DataReaderClosed(caller);
|
||
|
|
}
|
||
|
|
|
||
|
|
private void ValidateReader() {
|
||
|
|
if (ReaderIsInvalid)
|
||
|
|
throw ExceptionBuilder.InvalidDataTableReader(currentDataTable.TableName);
|
||
|
|
|
||
|
|
if (IsSchemaChanged) {
|
||
|
|
throw ExceptionBuilder.DataTableReaderSchemaIsInvalid(currentDataTable.TableName); // may be we can use better error message!
|
||
|
|
}
|
||
|
|
|
||
|
|
}
|
||
|
|
|
||
|
|
private void ValidateState(string caller) {
|
||
|
|
ValidateOpen(caller);
|
||
|
|
if (tableCleared) {
|
||
|
|
throw ExceptionBuilder.EmptyDataTableReader(currentDataTable.TableName);
|
||
|
|
}
|
||
|
|
// see if without any event raising, if our curent row has some changes!if so reader is invalid.
|
||
|
|
if ((currentDataRow == null) || (currentDataTable == null) ) {//|| (currentDataRow != currentDataTable.Rows[rowCounter])) do we need thios check!
|
||
|
|
ReaderIsInvalid = true;
|
||
|
|
throw ExceptionBuilder.InvalidDataTableReader(currentDataTable.TableName);
|
||
|
|
}
|
||
|
|
//See if without any event raing, if our rows are deleted, or removed! Reader is not invalid, user should be able to read and reach goo row WebData98325
|
||
|
|
if ((currentDataRow.RowState == DataRowState.Deleted) || (currentDataRow.RowState == DataRowState.Detached) ||currentRowRemoved)
|
||
|
|
throw ExceptionBuilder.InvalidCurrentRowInDataTableReader();
|
||
|
|
// user may have called clear (which removes the rows without raing event) or deleted part of rows without raising event!if so reader is invalid.
|
||
|
|
if (0 > rowCounter ||currentDataTable.Rows.Count <= rowCounter) {
|
||
|
|
ReaderIsInvalid = true;
|
||
|
|
throw ExceptionBuilder.InvalidDataTableReader(currentDataTable.TableName);
|
||
|
|
}
|
||
|
|
else {
|
||
|
|
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
private void ValidateRow(Int32 rowPosition) {
|
||
|
|
if (ReaderIsInvalid)
|
||
|
|
throw ExceptionBuilder.InvalidDataTableReader(currentDataTable.TableName);
|
||
|
|
|
||
|
|
if (0 > rowPosition ||currentDataTable.Rows.Count <= rowPosition) {
|
||
|
|
ReaderIsInvalid = true;
|
||
|
|
throw ExceptionBuilder.InvalidDataTableReader(currentDataTable.TableName);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
// Event Call backs from DataTableReaderListener, will invoke these methods
|
||
|
|
internal void SchemaChanged() {
|
||
|
|
IsSchemaChanged = true;
|
||
|
|
}
|
||
|
|
internal void DataTableCleared() {
|
||
|
|
if (!started)
|
||
|
|
return;
|
||
|
|
|
||
|
|
rowCounter = -1;
|
||
|
|
if (!reachEORows)
|
||
|
|
currentRowRemoved = true;
|
||
|
|
}
|
||
|
|
|
||
|
|
internal void DataChanged(DataRowChangeEventArgs args ) {
|
||
|
|
if ((!started) ||(rowCounter == -1 && !tableCleared))
|
||
|
|
return;
|
||
|
|
/* if (rowCounter == -1 && tableCleared && args.Action == DataRowAction.Add) {
|
||
|
|
tableCleared = false;
|
||
|
|
return;
|
||
|
|
}
|
||
|
|
*/
|
||
|
|
switch (args.Action) {
|
||
|
|
case DataRowAction.Add:
|
||
|
|
ValidateRow(rowCounter + 1);
|
||
|
|
/* if (tableCleared) {
|
||
|
|
tableCleared = false;
|
||
|
|
rowCounter++;
|
||
|
|
currentDataRow = currentDataTable.Rows[rowCounter];
|
||
|
|
currentRowRemoved = false;
|
||
|
|
}
|
||
|
|
else
|
||
|
|
*/
|
||
|
|
if (currentDataRow == currentDataTable.Rows[rowCounter + 1]) { // check if we moved one position up
|
||
|
|
rowCounter++; // if so, refresh the datarow and fix the counter
|
||
|
|
}
|
||
|
|
break;
|
||
|
|
case DataRowAction.Delete: // delete
|
||
|
|
case DataRowAction.Rollback:// rejectchanges
|
||
|
|
case DataRowAction.Commit: // acceptchanges
|
||
|
|
if ( args.Row.RowState == DataRowState.Detached ) {
|
||
|
|
if (args.Row != currentDataRow) {
|
||
|
|
if (rowCounter == 0) // if I am at first row and no previous row exist,NOOP
|
||
|
|
break;
|
||
|
|
ValidateRow(rowCounter -1);
|
||
|
|
if (currentDataRow == currentDataTable.Rows[rowCounter - 1]) { // one of previous rows is detached, collection size is changed!
|
||
|
|
rowCounter--;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
else { // we are proccessing current datarow
|
||
|
|
currentRowRemoved = true;
|
||
|
|
if (rowCounter > 0) { // go back one row, no matter what the state is
|
||
|
|
rowCounter--;
|
||
|
|
currentDataRow = currentDataTable.Rows[rowCounter];
|
||
|
|
}
|
||
|
|
else { // we are on 0th row, so reset data to initial state!
|
||
|
|
rowCounter = -1;
|
||
|
|
currentDataRow = null;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
break;
|
||
|
|
default:
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
}
|
||
|
|
}
|