public override void DescribeParameters()
{
lock (this.db)
{
// Marshal structures to pointer
XsqldaMarshaler marshaler = XsqldaMarshaler.Instance;
this.parameters = new Descriptor(1);
IntPtr sqlda = marshaler.MarshalManagedToNative(this.db.Charset, parameters);
int[] statusVector = ExtConnection.GetNewStatusVector();
int stmtHandle = this.handle;
SafeNativeMethods.isc_dsql_describe_bind(
statusVector,
ref stmtHandle,
IscCodes.SQLDA_VERSION1,
sqlda);
Descriptor descriptor = marshaler.MarshalNativeToManaged(this.db.Charset, sqlda);
// Parse status vector
this.db.ParseStatusVector(statusVector);
if (descriptor.ActualCount != 0 && descriptor.Count != descriptor.ActualCount)
{
short n = descriptor.ActualCount;
descriptor = new Descriptor(n);
// Fre memory
marshaler.CleanUpNativeData(ref sqlda);
// Marshal new structure
sqlda = marshaler.MarshalManagedToNative(this.db.Charset, descriptor);
SafeNativeMethods.isc_dsql_describe_bind(
statusVector,
ref stmtHandle,
IscCodes.SQLDA_VERSION1,
sqlda);
descriptor = marshaler.MarshalNativeToManaged(this.db.Charset, sqlda);
// Free memory
marshaler.CleanUpNativeData(ref sqlda);
// Parse status vector
this.db.ParseStatusVector(statusVector);
}
else
{
if (descriptor.ActualCount == 0)
{
descriptor = new Descriptor(0);
}
}
// Free memory
if (sqlda != IntPtr.Zero)
{
marshaler.CleanUpNativeData(ref sqlda);
}
// Update parameter descriptor
this.parameters = descriptor;
}
}
public override void Execute()
{
if (this.state == StatementState.Deallocated)
{
throw new InvalidOperationException("Statment is not correctly created.");
}
lock (this.db)
{
// Marshal structures to pointer
XsqldaMarshaler marshaler = XsqldaMarshaler.Instance;
IntPtr inSqlda = IntPtr.Zero;
IntPtr outSqlda = IntPtr.Zero;
if (this.parameters != null)
{
inSqlda = marshaler.MarshalManagedToNative(this.db.Charset, this.parameters);
}
if (this.statementType == DbStatementType.StoredProcedure)
{
this.Fields.ResetValues();
outSqlda = marshaler.MarshalManagedToNative(this.db.Charset, this.fields);
}
int[] statusVector = ExtConnection.GetNewStatusVector();
int trHandle = this.transaction.Handle;
int stmtHandle = this.handle;
SafeNativeMethods.isc_dsql_execute2(
statusVector,
ref trHandle,
ref stmtHandle,
IscCodes.SQLDA_VERSION1,
inSqlda,
outSqlda);
if (outSqlda != IntPtr.Zero)
{
Descriptor descriptor = marshaler.MarshalNativeToManaged(this.db.Charset, outSqlda);
// This would be an Execute procedure
DbValue[] values = new DbValue[descriptor.Count];
for (int i = 0; i < values.Length; i++)
{
values[i] = new DbValue(this, descriptor[i]);
}
this.outputParams.Enqueue(values);
}
// Free memory
marshaler.CleanUpNativeData(ref inSqlda);
marshaler.CleanUpNativeData(ref outSqlda);
this.db.ParseStatusVector(statusVector);
this.UpdateRecordsAffected();
this.state = StatementState.Executed;
}
}
public override DbValue[] Fetch()
{
DbValue[] row = null;
if (this.state == StatementState.Deallocated)
{
throw new InvalidOperationException("Statement is not correctly created.");
}
if (this.statementType != DbStatementType.Select &&
this.statementType != DbStatementType.SelectForUpdate)
{
return(null);
}
lock (this.db)
{
if (!this.allRowsFetched)
{
// Get the XSQLDA Marshaler
XsqldaMarshaler marshaler = XsqldaMarshaler.Instance;
// Reset actual field values
this.fields.ResetValues();
// Marshal structures to pointer
IntPtr sqlda = marshaler.MarshalManagedToNative(this.db.Charset, fields);
// Creta a new status vector
int[] statusVector = ExtConnection.GetNewStatusVector();
// Statement handle to be passed to the fetch method
int stmtHandle = this.handle;
// Fetch data
int status = SafeNativeMethods.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);
}
public override void Prepare(string commandText)
{
// Clear data
this.ClearAll();
lock (this.db)
{
if (this.state == StatementState.Deallocated)
{
// Allocate statement
this.Allocate();
}
// Marshal structures to pointer
XsqldaMarshaler marshaler = XsqldaMarshaler.Instance;
// Setup fields structure
this.fields = new Descriptor(1);
IntPtr sqlda = marshaler.MarshalManagedToNative(this.db.Charset, this.fields);
int[] statusVector = ExtConnection.GetNewStatusVector();
int trHandle = this.transaction.Handle;
int stmtHandle = this.handle;
byte[] buffer = this.db.Charset.GetBytes(commandText);
SafeNativeMethods.isc_dsql_prepare(
statusVector,
ref trHandle,
ref stmtHandle,
(short)buffer.Length,
buffer,
this.db.Dialect,
sqlda);
// Marshal Pointer
Descriptor descriptor = marshaler.MarshalNativeToManaged(this.db.Charset, sqlda);
// Free memory
marshaler.CleanUpNativeData(ref sqlda);
// Parse status vector
this.db.ParseStatusVector(statusVector);
// Describe fields
this.fields = descriptor;
if (this.fields.ActualCount > 0 && this.fields.ActualCount != this.fields.Count)
{
this.Describe();
}
else
{
if (this.fields.ActualCount == 0)
{
this.fields = new Descriptor(0);
}
}
// Reset actual field values
this.fields.ResetValues();
// Get Statement type
this.statementType = this.GetStatementType();
// Update state
this.state = StatementState.Prepared;
}
}
