本文整理汇总了C#中System.Data.OleDb.OleDbDataReader.InitializeIRowset方法的典型用法代码示例。如果您正苦于以下问题：C# OleDbDataReader.InitializeIRowset方法的具体用法？C# OleDbDataReader.InitializeIRowset怎么用？C# OleDbDataReader.InitializeIRowset使用的例子？那么恭喜您, 这里精选的方法代码示例或许可以为您提供帮助。您也可以进一步了解该方法所在类System.Data.OleDb.OleDbDataReader的用法示例。
在下文中一共展示了OleDbDataReader.InitializeIRowset方法的11个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于系统推荐出更棒的C#代码示例。
示例1: GetEnumeratorReader
static private OleDbDataReader GetEnumeratorReader(object value) {
NativeMethods.ISourcesRowset srcrowset = null;
try {
srcrowset = (NativeMethods.ISourcesRowset) value;
}
catch(InvalidCastException) {
throw ODB.ISourcesRowsetNotSupported();
}
if (null == srcrowset) {
throw ODB.ISourcesRowsetNotSupported();
}
value = null; // still held by ISourcesRowset, reused for IRowset
int propCount = 0;
IntPtr propSets = ADP.PtrZero;
Bid.Trace("<oledb.ISourcesRowset.GetSourcesRowset|API|OLEDB> IID_IRowset\n");
OleDbHResult hr = srcrowset.GetSourcesRowset(ADP.PtrZero, ODB.IID_IRowset, propCount, propSets, out value);
Bid.Trace("<oledb.ISourcesRowset.GetSourcesRowset|API|OLEDB|RET> %08X{HRESULT}\n", hr);
Exception f = OleDbConnection.ProcessResults(hr, null, null);
if (null != f) {
throw f;
}
OleDbDataReader dataReader = new OleDbDataReader(null, null, 0, CommandBehavior.Default);
dataReader.InitializeIRowset(value, ChapterHandle.DB_NULL_HCHAPTER, ADP.RecordsUnaffected);
dataReader.BuildMetaInfo();
dataReader.HasRowsRead();
return dataReader;
}示例2: GetEnumeratorReader
private static OleDbDataReader GetEnumeratorReader(object value)
{
System.Data.Common.NativeMethods.ISourcesRowset rowset = null;
try
{
rowset = (System.Data.Common.NativeMethods.ISourcesRowset) value;
}
catch (InvalidCastException)
{
throw ODB.ISourcesRowsetNotSupported();
}
if (rowset == null)
{
throw ODB.ISourcesRowsetNotSupported();
}
value = null;
int cPropertySets = 0;
IntPtr ptrZero = ADP.PtrZero;
Bid.Trace("<oledb.ISourcesRowset.GetSourcesRowset|API|OLEDB> IID_IRowset\n");
OleDbHResult result = rowset.GetSourcesRowset(ADP.PtrZero, ODB.IID_IRowset, cPropertySets, ptrZero, out value);
Bid.Trace("<oledb.ISourcesRowset.GetSourcesRowset|API|OLEDB|RET> %08X{HRESULT}\n", result);
Exception exception = OleDbConnection.ProcessResults(result, null, null);
if (exception != null)
{
throw exception;
}
OleDbDataReader reader = new OleDbDataReader(null, null, 0, CommandBehavior.Default);
reader.InitializeIRowset(value, ChapterHandle.DB_NULL_HCHAPTER, ADP.RecordsUnaffected);
reader.BuildMetaInfo();
reader.HasRowsRead();
return reader;
}示例3: ExecuteReaderInternal
private OleDbDataReader ExecuteReaderInternal(CommandBehavior behavior, string method) {
OleDbDataReader dataReader = null;
OleDbException nextResultsFailure = null;
int state = ODB.InternalStateClosed;
try {
ValidateConnectionAndTransaction(method);
if (0 != (CommandBehavior.SingleRow & behavior)) {
// CommandBehavior.SingleRow implies CommandBehavior.SingleResult
behavior |= CommandBehavior.SingleResult;
}
object executeResult;
int resultType;
switch(CommandType) {
case 0: // uninitialized CommandType.Text
case CommandType.Text:
case CommandType.StoredProcedure:
resultType = ExecuteCommand(behavior, out executeResult);
break;
case CommandType.TableDirect:
resultType = ExecuteTableDirect(behavior, out executeResult);
break;
default:
throw ADP.InvalidCommandType(CommandType);
}
if (_executeQuery) {
try {
dataReader = new OleDbDataReader(_connection, this, 0, this.commandBehavior);
switch(resultType) {
case ODB.ExecutedIMultipleResults:
dataReader.InitializeIMultipleResults(executeResult);
dataReader.NextResult();
break;
case ODB.ExecutedIRowset:
dataReader.InitializeIRowset(executeResult, ChapterHandle.DB_NULL_HCHAPTER, _recordsAffected);
dataReader.BuildMetaInfo();
dataReader.HasRowsRead();
break;
case ODB.ExecutedIRow:
dataReader.InitializeIRow(executeResult, _recordsAffected);
dataReader.BuildMetaInfo();
break;
case ODB.PrepareICommandText:
if (!_isPrepared) {
PrepareCommandText(2);
}
OleDbDataReader.GenerateSchemaTable(dataReader, _icommandText, behavior);
break;
default:
Debug.Assert(false, "ExecuteReaderInternal: unknown result type");
break;
}
executeResult = null;
_hasDataReader = true;
_connection.AddWeakReference(dataReader, OleDbReferenceCollection.DataReaderTag);
// command stays in the executing state until the connection
// has a datareader to track for it being closed
state = ODB.InternalStateOpen; // MDAC 72655
}
finally {
if (ODB.InternalStateOpen != state) {
this.canceling = true;
if (null != dataReader) {
((IDisposable) dataReader).Dispose();
dataReader = null;
}
}
}
Debug.Assert(null != dataReader, "ExecuteReader should never return a null DataReader");
}
else { // optimized code path for ExecuteNonQuery to not create a OleDbDataReader object
try {
if (ODB.ExecutedIMultipleResults == resultType) {
UnsafeNativeMethods.IMultipleResults multipleResults = (UnsafeNativeMethods.IMultipleResults) executeResult;
// may cause a Connection.ResetState which closes connection
nextResultsFailure = OleDbDataReader.NextResults(multipleResults, _connection, this, out _recordsAffected);
}
}
finally {
try {
if (null != executeResult) {
Marshal.ReleaseComObject(executeResult);
executeResult = null;
}
CloseFromDataReader(ParameterBindings);
}
catch(Exception e) {
//
if (!ADP.IsCatchableExceptionType(e)) {
throw;
}
if (null != nextResultsFailure) {
//.........这里部分代码省略.........
示例4: GetDataForReader
private OleDbDataReader GetDataForReader(IntPtr ordinal, RowBinding rowbinding, int valueOffset) {
UnsafeNativeMethods.IRowsetInfo rowsetInfo = IRowsetInfo();
UnsafeNativeMethods.IRowset result;
OleDbHResult hr;
Bid.Trace("<oledb.IRowsetInfo.GetReferencedRowset|API|OLEDB> %d#, ColumnOrdinal=%Id\n", ObjectID, ordinal);
hr = rowsetInfo.GetReferencedRowset((IntPtr)ordinal, ref ODB.IID_IRowset, out result);
Bid.Trace("<oledb.IRowsetInfo.GetReferencedRowset|API|OLEDB|RET> %08X{HRESULT}\n", hr);
ProcessResults(hr);
OleDbDataReader reader = null;
if (null != result) {
// only when the first datareader is closed will the connection close
ChapterHandle chapterHandle = ChapterHandle.CreateChapterHandle(result, rowbinding, valueOffset);
reader = new OleDbDataReader(_connection, _command, 1+Depth, _commandBehavior & ~CommandBehavior.CloseConnection);
reader.InitializeIRowset(result, chapterHandle, ADP.RecordsUnaffected);
reader.BuildMetaInfo();
reader.HasRowsRead();
if (null != _connection) {
// connection tracks all readers to prevent cmd from executing
// until all readers (including nested) are closed
_connection.AddWeakReference(reader, OleDbReferenceCollection.DataReaderTag);
}
}
return reader;
}示例5: DumpToSchemaTable
internal void DumpToSchemaTable(UnsafeNativeMethods.IRowset rowset) {
List<MetaData> metainfo = new List<MetaData>();
object hiddenColumns = null;
using (OleDbDataReader dataReader = new OleDbDataReader(_connection, _command, Int32.MinValue, 0)) {
dataReader.InitializeIRowset(rowset, ChapterHandle.DB_NULL_HCHAPTER, IntPtr.Zero);
dataReader.BuildSchemaTableInfo(rowset, true, false);
hiddenColumns = GetPropertyValue(ODB.DBPROP_HIDDENCOLUMNS); // MDAC 55611, 72106
if (0 == dataReader.FieldCount) {
return;
}
Debug.Assert(null == dataReader._fieldNameLookup, "lookup already exists");
FieldNameLookup lookup = new FieldNameLookup(dataReader, -1);
dataReader._fieldNameLookup = lookup;
// This column, together with the DBCOLUMN_GUID and DBCOLUMN_PROPID
// columns, forms the ID of the column. One or more (but not all) of these columns
// will be NULL, depending on which elements of the DBID structure the provider uses.
MetaData columnidname = dataReader.FindMetaData(ODB.DBCOLUMN_IDNAME);
MetaData columnguid = dataReader.FindMetaData(ODB.DBCOLUMN_GUID);
MetaData columnpropid = dataReader.FindMetaData(ODB.DBCOLUMN_PROPID);
MetaData columnname = dataReader.FindMetaData(ODB.DBCOLUMN_NAME);
MetaData columnordinal = dataReader.FindMetaData(ODB.DBCOLUMN_NUMBER);
MetaData dbtype = dataReader.FindMetaData(ODB.DBCOLUMN_TYPE);
MetaData columnsize = dataReader.FindMetaData(ODB.DBCOLUMN_COLUMNSIZE);
MetaData numericprecision = dataReader.FindMetaData(ODB.DBCOLUMN_PRECISION);
MetaData numericscale = dataReader.FindMetaData(ODB.DBCOLUMN_SCALE);
MetaData columnflags = dataReader.FindMetaData(ODB.DBCOLUMN_FLAGS);
MetaData baseschemaname = dataReader.FindMetaData(ODB.DBCOLUMN_BASESCHEMANAME);
MetaData basecatalogname = dataReader.FindMetaData(ODB.DBCOLUMN_BASECATALOGNAME);
MetaData basetablename = dataReader.FindMetaData(ODB.DBCOLUMN_BASETABLENAME);
MetaData basecolumnname = dataReader.FindMetaData(ODB.DBCOLUMN_BASECOLUMNNAME);
MetaData isautoincrement = dataReader.FindMetaData(ODB.DBCOLUMN_ISAUTOINCREMENT);
MetaData isunique = dataReader.FindMetaData(ODB.DBCOLUMN_ISUNIQUE);
MetaData iskeycolumn = dataReader.FindMetaData(ODB.DBCOLUMN_KEYCOLUMN);
// @devnote: because we want to use the DBACCESSOR_OPTIMIZED bit,
// we are required to create the accessor before fetching any rows
dataReader.CreateAccessors(false);
ColumnBinding binding;
while (dataReader.ReadRowset()) {
dataReader.GetRowDataFromHandle();
MetaData info = new MetaData();
binding = columnidname.columnBinding; // MDAC 72627
if (!binding.IsValueNull()) {
info.idname = (string)binding.Value();
info.kind = ODB.DBKIND_NAME;
}
binding = columnguid.columnBinding;
if (!binding.IsValueNull()) {
info.guid = binding.Value_GUID();
info.kind = ((ODB.DBKIND_NAME == info.kind) ? ODB.DBKIND_GUID_NAME : ODB.DBKIND_GUID);
}
binding = columnpropid.columnBinding;
if (!binding.IsValueNull()) {
info.propid = new IntPtr(binding.Value_UI4());
info.kind = ((ODB.DBKIND_GUID == info.kind) ? ODB.DBKIND_GUID_PROPID : ODB.DBKIND_PROPID);
}
binding = columnname.columnBinding;
if (!binding.IsValueNull()) {
info.columnName = (string)binding.Value();
}
else {
info.columnName = "";
}
if (4 == ADP.PtrSize) {
info.ordinal = (IntPtr)columnordinal.columnBinding.Value_UI4();
}
else {
info.ordinal = (IntPtr)columnordinal.columnBinding.Value_UI8();
}
short wType = unchecked((short) dbtype.columnBinding.Value_UI2());
if (4 == ADP.PtrSize) {
info.size = unchecked((int) columnsize.columnBinding.Value_UI4()); // WebData 99298
}
else {
info.size = ADP.IntPtrToInt32((IntPtr)unchecked((long)columnsize.columnBinding.Value_UI8()));
}
binding = numericprecision.columnBinding;
if (!binding.IsValueNull()) {
info.precision = (byte)binding.Value_UI2();
}
binding = numericscale.columnBinding;
if (!binding.IsValueNull()) {
info.scale = (byte)binding.Value_I2();
}
//.........这里部分代码省略.........
示例6: FillFromRecordset
//override protected int Fill(DataTable dataTable, IDataReader dataReader) { // MDAC 65506
// return base.Fill(dataTable, dataReader);
//}
private int FillFromRecordset(Object data, UnsafeNativeMethods.ADORecordsetConstruction recordset, string srcTable, out bool incrementResultCount) {
incrementResultCount = false;
IntPtr chapter; /*ODB.DB_NULL_HCHAPTER*/
object result = null;
try {
Bid.Trace("<oledb.ADORecordsetConstruction.get_Rowset|API|ADODB>\n");
result = recordset.get_Rowset(); // MDAC 83342
Bid.Trace("<oledb.ADORecordsetConstruction.get_Rowset|API|ADODB|RET> %08X{HRESULT}\n", 0);
Bid.Trace("<oledb.ADORecordsetConstruction.get_Chapter|API|ADODB>\n");
chapter = recordset.get_Chapter(); // MDAC 83342
Bid.Trace("<oledb.ADORecordsetConstruction.get_Chapter|API|ADODB|RET> %08X{HRESULT}\n", 0);
}
catch (Exception e) {
//
if (!ADP.IsCatchableExceptionType(e)) {
throw;
}
throw ODB.Fill_EmptyRecordSet("ADODBRecordSet", e);
}
if (null != result) {
CommandBehavior behavior = (MissingSchemaAction.AddWithKey != MissingSchemaAction) ? 0 : CommandBehavior.KeyInfo;
behavior |= CommandBehavior.SequentialAccess;
OleDbDataReader dataReader = null;
try {
// intialized with chapter only since we don't want ReleaseChapter called for this chapter handle
ChapterHandle chapterHandle = ChapterHandle.CreateChapterHandle(chapter);
dataReader = new OleDbDataReader(null, null, 0, behavior);
dataReader.InitializeIRowset(result, chapterHandle, ADP.RecordsUnaffected);
dataReader.BuildMetaInfo();
incrementResultCount = (0 < dataReader.FieldCount); // MDAC 59632
if (incrementResultCount) {
if (data is DataTable) {
return base.Fill((DataTable) data, dataReader); // MDAC 65506
}
else {
return base.Fill((DataSet) data, srcTable, dataReader, 0, 0);
}
}
}
finally {
if (null != dataReader) {
dataReader.Close();
}
}
}
return 0;
}示例7: DumpToSchemaTable
internal void DumpToSchemaTable(System.Data.Common.UnsafeNativeMethods.IRowset rowset)
{
List<System.Data.OleDb.MetaData> list = new List<System.Data.OleDb.MetaData>();
object propertyValue = null;
using (OleDbDataReader reader = new OleDbDataReader(this._connection, this._command, -2147483648, CommandBehavior.Default))
{
reader.InitializeIRowset(rowset, ChapterHandle.DB_NULL_HCHAPTER, IntPtr.Zero);
reader.BuildSchemaTableInfo(rowset, true, false);
propertyValue = this.GetPropertyValue(0x102);
if (reader.FieldCount == 0)
{
return;
}
FieldNameLookup lookup = new FieldNameLookup(reader, -1);
reader._fieldNameLookup = lookup;
System.Data.OleDb.MetaData data20 = reader.FindMetaData("DBCOLUMN_IDNAME");
System.Data.OleDb.MetaData data19 = reader.FindMetaData("DBCOLUMN_GUID");
System.Data.OleDb.MetaData data18 = reader.FindMetaData("DBCOLUMN_PROPID");
System.Data.OleDb.MetaData data17 = reader.FindMetaData("DBCOLUMN_NAME");
System.Data.OleDb.MetaData data12 = reader.FindMetaData("DBCOLUMN_NUMBER");
System.Data.OleDb.MetaData data16 = reader.FindMetaData("DBCOLUMN_TYPE");
System.Data.OleDb.MetaData data11 = reader.FindMetaData("DBCOLUMN_COLUMNSIZE");
System.Data.OleDb.MetaData data15 = reader.FindMetaData("DBCOLUMN_PRECISION");
System.Data.OleDb.MetaData data14 = reader.FindMetaData("DBCOLUMN_SCALE");
System.Data.OleDb.MetaData data13 = reader.FindMetaData("DBCOLUMN_FLAGS");
System.Data.OleDb.MetaData data10 = reader.FindMetaData("DBCOLUMN_BASESCHEMANAME");
System.Data.OleDb.MetaData data9 = reader.FindMetaData("DBCOLUMN_BASECATALOGNAME");
System.Data.OleDb.MetaData data8 = reader.FindMetaData("DBCOLUMN_BASETABLENAME");
System.Data.OleDb.MetaData data7 = reader.FindMetaData("DBCOLUMN_BASECOLUMNNAME");
System.Data.OleDb.MetaData data6 = reader.FindMetaData("DBCOLUMN_ISAUTOINCREMENT");
System.Data.OleDb.MetaData data5 = reader.FindMetaData("DBCOLUMN_ISUNIQUE");
System.Data.OleDb.MetaData data4 = reader.FindMetaData("DBCOLUMN_KEYCOLUMN");
reader.CreateAccessors(false);
while (reader.ReadRowset())
{
reader.GetRowDataFromHandle();
System.Data.OleDb.MetaData item = new System.Data.OleDb.MetaData();
ColumnBinding columnBinding = data20.columnBinding;
if (!columnBinding.IsValueNull())
{
item.idname = (string) columnBinding.Value();
item.kind = 2;
}
columnBinding = data19.columnBinding;
if (!columnBinding.IsValueNull())
{
item.guid = columnBinding.Value_GUID();
item.kind = (2 == item.kind) ? 0 : 6;
}
columnBinding = data18.columnBinding;
if (!columnBinding.IsValueNull())
{
item.propid = new IntPtr((long) columnBinding.Value_UI4());
item.kind = (6 == item.kind) ? 1 : 5;
}
columnBinding = data17.columnBinding;
if (!columnBinding.IsValueNull())
{
item.columnName = (string) columnBinding.Value();
}
else
{
item.columnName = "";
}
if (4 == ADP.PtrSize)
{
item.ordinal = (IntPtr) data12.columnBinding.Value_UI4();
}
else
{
item.ordinal = (IntPtr) data12.columnBinding.Value_UI8();
}
short dbType = (short) data16.columnBinding.Value_UI2();
if (4 == ADP.PtrSize)
{
item.size = (int) data11.columnBinding.Value_UI4();
}
else
{
item.size = ADP.IntPtrToInt32((IntPtr) data11.columnBinding.Value_UI8());
}
columnBinding = data15.columnBinding;
if (!columnBinding.IsValueNull())
{
item.precision = (byte) columnBinding.Value_UI2();
}
columnBinding = data14.columnBinding;
if (!columnBinding.IsValueNull())
{
item.scale = (byte) columnBinding.Value_I2();
}
item.flags = (int) data13.columnBinding.Value_UI4();
bool isLong = IsLong(item.flags);
bool isFixed = IsFixed(item.flags);
NativeDBType type = NativeDBType.FromDBType(dbType, isLong, isFixed);
item.type = type;
if (data6 != null)
{
columnBinding = data6.columnBinding;
if (!columnBinding.IsValueNull())
//.........这里部分代码省略.........
示例8: GetDataForReader
private OleDbDataReader GetDataForReader(IntPtr ordinal, RowBinding rowbinding, int valueOffset)
{
System.Data.Common.UnsafeNativeMethods.IRowset rowset;
System.Data.Common.UnsafeNativeMethods.IRowsetInfo info = this.IRowsetInfo();
Bid.Trace("<oledb.IRowsetInfo.GetReferencedRowset|API|OLEDB> %d#, ColumnOrdinal=%Id\n", this.ObjectID, ordinal);
OleDbHResult result = info.GetReferencedRowset(ordinal, ref ODB.IID_IRowset, out rowset);
Bid.Trace("<oledb.IRowsetInfo.GetReferencedRowset|API|OLEDB|RET> %08X{HRESULT}\n", result);
this.ProcessResults(result);
OleDbDataReader reader = null;
if (rowset != null)
{
ChapterHandle chapterHandle = ChapterHandle.CreateChapterHandle(rowset, rowbinding, valueOffset);
reader = new OleDbDataReader(this._connection, this._command, 1 + this.Depth, this._commandBehavior & ~CommandBehavior.CloseConnection);
reader.InitializeIRowset(rowset, chapterHandle, ADP.RecordsUnaffected);
reader.BuildMetaInfo();
reader.HasRowsRead();
if (this._connection != null)
{
this._connection.AddWeakReference(reader, 2);
}
}
return reader;
}示例9: GetSchemaRowset
internal DataTable GetSchemaRowset(Guid schema, object[] restrictions) {
IntPtr hscp;
Bid.ScopeEnter(out hscp, "<oledb.OleDbConnectionInternal.GetSchemaRowset|INFO> %d#, schema=%ls, restrictions\n", ObjectID, schema);
try {
if (null == restrictions) { // MDAC 62243
restrictions = new object[0];
}
DataTable dataTable = null;
using(IDBSchemaRowsetWrapper wrapper = IDBSchemaRowset()) {
UnsafeNativeMethods.IDBSchemaRowset dbSchemaRowset = wrapper.Value;
if (null == dbSchemaRowset) {
throw ODB.SchemaRowsetsNotSupported(Provider);
}
UnsafeNativeMethods.IRowset rowset = null;
OleDbHResult hr;
Bid.Trace("<oledb.IDBSchemaRowset.GetRowset|API|OLEDB> %d#\n", ObjectID);
hr = dbSchemaRowset.GetRowset(ADP.PtrZero, ref schema, restrictions.Length, restrictions, ref ODB.IID_IRowset, 0, ADP.PtrZero, out rowset);
Bid.Trace("<oledb.IDBSchemaRowset.GetRowset|API|OLEDB|RET> %08X{HRESULT}\n", hr);
if (hr < 0) { // ignore infomsg
ProcessResults(hr);
}
if (null != rowset) {
using(OleDbDataReader dataReader = new OleDbDataReader(Connection, null, 0, CommandBehavior.Default)) {
dataReader.InitializeIRowset(rowset, ChapterHandle.DB_NULL_HCHAPTER, IntPtr.Zero);
dataReader.BuildMetaInfo();
dataReader.HasRowsRead();
dataTable = new DataTable();
dataTable.Locale = CultureInfo.InvariantCulture;
dataTable.TableName = OleDbSchemaGuid.GetTextFromValue(schema);
OleDbDataAdapter.FillDataTable(dataReader, dataTable);
}
}
return dataTable;
}
}
finally {
Bid.ScopeLeave(ref hscp);
}
}示例10: FillFromRecordset
private int FillFromRecordset(object data, System.Data.Common.UnsafeNativeMethods.ADORecordsetConstruction recordset, string srcTable, out bool incrementResultCount)
{
IntPtr ptr;
incrementResultCount = false;
object result = null;
try
{
Bid.Trace("<oledb.ADORecordsetConstruction.get_Rowset|API|ADODB>\n");
result = recordset.get_Rowset();
Bid.Trace("<oledb.ADORecordsetConstruction.get_Rowset|API|ADODB|RET> %08X{HRESULT}\n", 0);
Bid.Trace("<oledb.ADORecordsetConstruction.get_Chapter|API|ADODB>\n");
ptr = recordset.get_Chapter();
Bid.Trace("<oledb.ADORecordsetConstruction.get_Chapter|API|ADODB|RET> %08X{HRESULT}\n", 0);
}
catch (Exception exception)
{
if (!ADP.IsCatchableExceptionType(exception))
{
throw;
}
throw ODB.Fill_EmptyRecordSet("ADODBRecordSet", exception);
}
if (result != null)
{
CommandBehavior commandBehavior = (MissingSchemaAction.AddWithKey != base.MissingSchemaAction) ? CommandBehavior.Default : CommandBehavior.KeyInfo;
commandBehavior |= CommandBehavior.SequentialAccess;
OleDbDataReader dataReader = null;
try
{
ChapterHandle chapterHandle = ChapterHandle.CreateChapterHandle(ptr);
dataReader = new OleDbDataReader(null, null, 0, commandBehavior);
dataReader.InitializeIRowset(result, chapterHandle, ADP.RecordsUnaffected);
dataReader.BuildMetaInfo();
incrementResultCount = 0 < dataReader.FieldCount;
if (incrementResultCount)
{
if (data is DataTable)
{
return base.Fill((DataTable) data, dataReader);
}
return base.Fill((DataSet) data, srcTable, dataReader, 0, 0);
}
}
finally
{
if (dataReader != null)
{
dataReader.Close();
}
}
}
return 0;
}示例11: ExecuteReaderInternal
private OleDbDataReader ExecuteReaderInternal(CommandBehavior behavior, string method)
{
OleDbDataReader dataReader = null;
OleDbException previous = null;
int num2 = 0;
try
{
object obj2;
int num;
this.ValidateConnectionAndTransaction(method);
if ((CommandBehavior.SingleRow & behavior) != CommandBehavior.Default)
{
behavior |= CommandBehavior.SingleResult;
}
switch (this.CommandType)
{
case ((System.Data.CommandType) 0):
case System.Data.CommandType.Text:
case System.Data.CommandType.StoredProcedure:
num = this.ExecuteCommand(behavior, out obj2);
break;
case System.Data.CommandType.TableDirect:
num = this.ExecuteTableDirect(behavior, out obj2);
break;
default:
throw ADP.InvalidCommandType(this.CommandType);
}
if (this._executeQuery)
{
try
{
dataReader = new OleDbDataReader(this._connection, this, 0, this.commandBehavior);
switch (num)
{
case 0:
dataReader.InitializeIMultipleResults(obj2);
dataReader.NextResult();
break;
case 1:
dataReader.InitializeIRowset(obj2, ChapterHandle.DB_NULL_HCHAPTER, this._recordsAffected);
dataReader.BuildMetaInfo();
dataReader.HasRowsRead();
break;
case 2:
dataReader.InitializeIRow(obj2, this._recordsAffected);
dataReader.BuildMetaInfo();
break;
case 3:
if (!this._isPrepared)
{
this.PrepareCommandText(2);
}
OleDbDataReader.GenerateSchemaTable(dataReader, this._icommandText, behavior);
break;
}
obj2 = null;
this._hasDataReader = true;
this._connection.AddWeakReference(dataReader, 2);
num2 = 1;
return dataReader;
}
finally
{
if (1 != num2)
{
this.canceling = true;
if (dataReader != null)
{
dataReader.Dispose();
dataReader = null;
}
}
}
}
try
{
if (num == 0)
{
UnsafeNativeMethods.IMultipleResults imultipleResults = (UnsafeNativeMethods.IMultipleResults) obj2;
previous = OleDbDataReader.NextResults(imultipleResults, this._connection, this, out this._recordsAffected);
}
}
finally
{
try
{
if (obj2 != null)
{
Marshal.ReleaseComObject(obj2);
obj2 = null;
}
this.CloseFromDataReader(this.ParameterBindings);
}
catch (Exception exception3)
{
//.........这里部分代码省略.........