public override DbValue[] Fetch()
{
DbValue[] row = null;
if (this.state == StatementState.Deallocated)
{
throw new InvalidOperationException("Statment is not correctly created.");
}
if (this.statementType != DbStatementType.Select &&
this.statementType != DbStatementType.SelectForUpdate)
{
return(null);
}
lock (this.db)
{
if (!this.allRowsFetched)
{
// Marshal structures to pointer
XsqldaMarshaler marshaler = XsqldaMarshaler.GetInstance();
// Reset actual field values
this.fields.ResetValues();
IntPtr sqlda = marshaler.MarshalManagedToNative(this.db.Charset, fields);
int[] statusVector = FesConnection.GetNewStatusVector();
int stmtHandle = this.handle;
int status = FbClient.isc_dsql_fetch(
statusVector,
ref stmtHandle,
IscCodes.SQLDA_VERSION1,
sqlda);
// Obtain values
Descriptor rowDesc = marshaler.MarshalNativeToManaged(this.db.Charset, sqlda);
if (this.fields.Count == rowDesc.Count)
{
// Try to preserve Array Handle information
for (int i = 0; i < this.fields.Count; i++)
{
if (this.fields[i].IsArray() &&
this.fields[i].ArrayHandle != null)
{
rowDesc[i].ArrayHandle = this.fields[i].ArrayHandle;
}
}
}
this.fields = rowDesc;
// Free memory
marshaler.CleanUpNativeData(ref sqlda);
// Parse status vector
this.db.ParseStatusVector(statusVector);
if (status == 100)
{
this.allRowsFetched = true;
}
else
{
// Set row values
row = new DbValue[this.fields.ActualCount];
for (int i = 0; i < row.Length; i++)
{
row[i] = new DbValue(this, this.fields[i]);
}
}
}
}
return(row);
}