本文整理汇总了C#中System.Data.OleDb.OleDbDataReader.HasRowsRead方法的典型用法代码示例。如果您正苦于以下问题：C# OleDbDataReader.HasRowsRead方法的具体用法？C# OleDbDataReader.HasRowsRead怎么用？C# OleDbDataReader.HasRowsRead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.HasRowsRead方法的7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: 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6: 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7: 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.........