internal DataTable GetSchemaRowset(Guid schema, object[] restrictions)
{
DataTable table2;
IntPtr ptr;
Bid.ScopeEnter(out ptr, "<oledb.OleDbConnectionInternal.GetSchemaRowset|INFO> %d#, schema=%ls, restrictions\n", base.ObjectID, schema);
try
{
if (restrictions == null)
{
restrictions = new object[0];
}
DataTable table = null;
using (IDBSchemaRowsetWrapper wrapper = this.IDBSchemaRowset())
{
System.Data.Common.UnsafeNativeMethods.IDBSchemaRowset rowset2 = wrapper.Value;
if (rowset2 == null)
{
throw ODB.SchemaRowsetsNotSupported(this.Provider);
}
System.Data.Common.UnsafeNativeMethods.IRowset ppRowset = null;
Bid.Trace("<oledb.IDBSchemaRowset.GetRowset|API|OLEDB> %d#\n", base.ObjectID);
OleDbHResult result = rowset2.GetRowset(ADP.PtrZero, ref schema, restrictions.Length, restrictions, ref ODB.IID_IRowset, 0, ADP.PtrZero, out ppRowset);
Bid.Trace("<oledb.IDBSchemaRowset.GetRowset|API|OLEDB|RET> %08X{HRESULT}\n", result);
if (result < OleDbHResult.S_OK)
{
this.ProcessResults(result);
}
if (ppRowset != null)
{
using (OleDbDataReader reader = new OleDbDataReader(this.Connection, null, 0, CommandBehavior.Default))
{
reader.InitializeIRowset(ppRowset, ChapterHandle.DB_NULL_HCHAPTER, IntPtr.Zero);
reader.BuildMetaInfo();
reader.HasRowsRead();
table = new DataTable {
Locale = CultureInfo.InvariantCulture,
TableName = OleDbSchemaGuid.GetTextFromValue(schema)
};
OleDbDataAdapter.FillDataTable(reader, new DataTable[] { table });
}
}
return(table);
}
}
finally
{
Bid.ScopeLeave(ref ptr);
}
return(table2);
}
internal SchemaSupport[] GetSchemaRowsetInformation()
{
OleDbConnectionString connectionString = this.ConnectionString;
SchemaSupport[] schemaSupport = connectionString.SchemaSupport;
if (schemaSupport != null)
{
return(schemaSupport);
}
using (IDBSchemaRowsetWrapper wrapper = this.IDBSchemaRowset())
{
OleDbHResult result;
System.Data.Common.UnsafeNativeMethods.IDBSchemaRowset dbSchemaRowset = wrapper.Value;
if (dbSchemaRowset == null)
{
return(null);
}
int schemaCount = 0;
IntPtr ptrZero = ADP.PtrZero;
IntPtr schemaRestrictions = ADP.PtrZero;
using (new DualCoTaskMem(dbSchemaRowset, out schemaCount, out ptrZero, out schemaRestrictions, out result))
{
dbSchemaRowset = null;
if (result < OleDbHResult.S_OK)
{
this.ProcessResults(result);
}
schemaSupport = new SchemaSupport[schemaCount];
if (ADP.PtrZero != ptrZero)
{
int index = 0;
for (int i = 0; index < schemaSupport.Length; i += ODB.SizeOf_Guid)
{
IntPtr ptr = ADP.IntPtrOffset(ptrZero, index * ODB.SizeOf_Guid);
schemaSupport[index]._schemaRowset = (Guid)Marshal.PtrToStructure(ptr, typeof(Guid));
index++;
}
}
if (ADP.PtrZero != schemaRestrictions)
{
for (int j = 0; j < schemaSupport.Length; j++)
{
schemaSupport[j]._restrictions = Marshal.ReadInt32(schemaRestrictions, j * 4);
}
}
}
connectionString.SchemaSupport = schemaSupport;
return(schemaSupport);
}
}
