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(*
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* Firebird Interface (fbintf). The fbintf components provide a set of
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* Pascal language bindings for the Firebird API. Although predominantly
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* a new development they include source code taken from IBX and may be
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* considered a derived product. This software thus also includes the copyright
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* notice and license conditions from IBX.
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*
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* Except for those parts dervied from IBX, contents of this file are subject
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* to the Initial Developer's Public License Version 1.0 (the "License"); you
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* may not use this file except in compliance with the License. You may obtain a
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* copy of the License here:
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*
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* http://www.firebirdsql.org/index.php?op=doc&id=idpl
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*
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* Software distributed under the License is distributed on an "AS
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* IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
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* implied. See the License for the specific language governing rights
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* and limitations under the License.
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*
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* The Initial Developer of the Original Code is Tony Whyman.
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*
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* The Original Code is (C) 2016 Tony Whyman, MWA Software
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* (http://www.mwasoftware.co.uk).
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*
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* All Rights Reserved.
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*
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* Contributor(s): ______________________________________.
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*
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*)
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{************************************************************************}
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{ }
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{ Borland Delphi Visual Component Library }
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{ InterBase Express core components }
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{ }
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{ Copyright (c) 1998-2000 Inprise Corporation }
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{ }
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{ InterBase Express is based in part on the product }
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{ Free IB Components, written by Gregory H. Deatz for }
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{ Hoagland, Longo, Moran, Dunst & Doukas Company. }
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{ Free IB Components is used under license. }
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{ }
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{ The contents of this file are subject to the InterBase }
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{ Public License Version 1.0 (the "License"); you may not }
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{ use this file except in compliance with the License. You }
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{ may obtain a copy of the License at http://www.Inprise.com/IPL.html }
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{ Software distributed under the License is distributed on }
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{ an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, either }
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{ express or implied. See the License for the specific language }
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{ governing rights and limitations under the License. }
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{ The Original Code was created by InterBase Software Corporation }
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{ and its successors. }
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{ Portions created by Inprise Corporation are Copyright (C) Inprise }
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{ Corporation. All Rights Reserved. }
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{ Contributor(s): Jeff Overcash }
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{ }
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{ IBX For Lazarus (Firebird Express) }
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{ Contributor: Tony Whyman, MWA Software http://www.mwasoftware.co.uk }
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{ Portions created by MWA Software are copyright McCallum Whyman }
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{ Associates Ltd 2011 - 2015 }
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{ }
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{************************************************************************}
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unit FB25Statement;
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{$IFDEF MSWINDOWS}
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{$DEFINE WINDOWS}
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{$ENDIF}
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{$IFDEF FPC}
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{$mode delphi}
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{$codepage UTF8}
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{$interfaces COM}
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{$ENDIF}
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{This unit is hacked from IBSQL and contains the code for managing an XSQLDA and
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SQLVars, along with statement preparation, execution and cursor management.
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Most of the SQLVar code has been moved to unit FBSQLData. Client access is
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provided through interface rather than direct access to the XSQLDA and XSQLVar
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objects.}
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{
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Note on reference counted interfaces.
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------------------------------------
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TFB25Statement manages both an input and an output SQLDA through the TIBXINPUTSQLDA
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and TIBXOUTPUTSQLDA objects. As pure objects, these are explicitly destroyed
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when the statement is destroyed.
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However, IResultSet is an interface and is returned when a cursor is opened and
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has a reference for the TIBXOUTPUTSQLDA. The user may discard their reference
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to the IStatement while still using the IResultSet. This would be a problem if t
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he underlying TFB25Statement object and its TIBXOUTPUTSQLDA is destroyed while
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still leaving the TIBXResultSet object in place. Calls to (e.g.) FetchNext would fail.
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To avoid this problem, TResultsSet objects have a reference to the IStatement
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interface of the TFB25Statement object. Thus, as long as these "copies" exist,
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the owning statement is not destroyed even if the user discards their reference
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to the statement. Note: the TFB25Statement does not have a reference to the TIBXResultSet
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interface. This way circular references are avoided.
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To avoid an IResultSet interface being kept too long and no longer synchronised
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with the query, each statement includes a prepare sequence number, incremented
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each time the query is prepared. When the IResultSet interface is created, it
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noted the current prepare sequence number. Whe an IResult interface is accessed
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it checks this number against the statement's current prepare sequence number.
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If not the same, an error is raised.
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A similar strategy is used for the IMetaData, IResults and ISQLParams interfaces.
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}
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interface
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uses
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Classes, SysUtils, IB, FBClientAPI, FB25ClientAPI, FB25Transaction, FB25Attachment,
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IBHeader, IBExternals, FBSQLData, FBOutputBlock, FBStatement, FBActivityMonitor;
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type
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TFB25Statement = class;
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TIBXSQLDA = class;
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{ TIBXSQLVAR }
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TIBXSQLVAR = class(TSQLVarData)
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private
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FStatement: TFB25Statement;
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FBlob: IBlob; {Cache references}
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FArray: IArray;
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FNullIndicator: short;
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FOwnsSQLData: boolean;
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FBlobMetaData: IBlobMetaData;
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FArrayMetaData: IArrayMetaData;
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FXSQLVAR: PXSQLVAR; { Points to the PXSQLVAR in the owner object }
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protected
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function GetSQLType: cardinal; override;
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function GetSubtype: integer; override;
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function GetAliasName: AnsiString; override;
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function GetFieldName: AnsiString; override;
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function GetOwnerName: AnsiString; override;
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function GetRelationName: AnsiString; override;
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function GetScale: integer; override;
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function GetCharSetID: cardinal; override;
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function GetCodePage: TSystemCodePage; override;
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function GetIsNull: Boolean; override;
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function GetIsNullable: boolean; override;
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function GetSQLData: PByte; override;
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function GetDataLength: cardinal; override;
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procedure SetIsNull(Value: Boolean); override;
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procedure SetIsNullable(Value: Boolean); override;
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procedure SetSQLData(AValue: PByte; len: cardinal); override;
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procedure SetScale(aValue: integer); override;
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procedure SetDataLength(len: cardinal); override;
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procedure SetSQLType(aValue: cardinal); override;
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procedure SetCharSetID(aValue: cardinal); override;
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public
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constructor Create(aParent: TIBXSQLDA; aIndex: integer);
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procedure FreeSQLData;
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procedure RowChange; override;
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function GetAsArray(Array_ID: TISC_QUAD): IArray; override;
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function GetAsBlob(Blob_ID: TISC_QUAD; BPB: IBPB): IBlob; override;
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function GetArrayMetaData: IArrayMetaData; override;
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function GetBlobMetaData: IBlobMetaData; override;
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function CreateBlob: IBlob; override;
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procedure Initialize; override;
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property Statement: TFB25Statement read FStatement;
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end;
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TIBXINPUTSQLDA = class;
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{ TIBXSQLDA }
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TIBXSQLDA = class(TSQLDataArea)
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private
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FCount: Integer; {Columns in use - may be less than inherited columns}
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FSize: Integer; {Number of TIBXSQLVARs in column list}
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FXSQLDA: PXSQLDA;
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FTransactionSeqNo: integer;
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function GetRecordSize: Integer;
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function GetXSQLDA: PXSQLDA;
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protected
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FStatement: TFB25Statement;
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function GetTransactionSeqNo: integer; override;
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procedure FreeXSQLDA;
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function GetStatement: IStatement; override;
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function GetPrepareSeqNo: integer; override;
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procedure SetCount(Value: Integer); override;
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public
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constructor Create(aStatement: TFB25Statement);
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destructor Destroy; override;
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function CheckStatementStatus(Request: TStatementStatus): boolean; override;
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function ColumnsInUseCount: integer; override;
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function GetTransaction: TFB25Transaction; virtual;
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procedure Initialize; override;
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function StateChanged(var ChangeSeqNo: integer): boolean; override;
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property AsXSQLDA: PXSQLDA read GetXSQLDA;
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property Count: Integer read FCount write SetCount;
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property RecordSize: Integer read GetRecordSize;
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property Statement: TFB25Statement read FStatement;
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end;
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{ TIBXINPUTSQLDA }
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TIBXINPUTSQLDA = class(TIBXSQLDA)
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public
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procedure Bind;
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function IsInputDataArea: boolean; override;
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end;
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{ TIBXOUTPUTSQLDA }
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TIBXOUTPUTSQLDA = class(TIBXSQLDA)
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private
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FTransaction: TFB25Transaction; {transaction used to execute the statement}
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public
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procedure Bind;
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function GetTransaction: TFB25Transaction; override;
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procedure GetData(index: integer; var aIsNull: boolean; var len: short;
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var data: PByte); override;
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function IsInputDataArea: boolean; override;
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end;
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{ TResultSet }
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TResultSet = class(TResults,IResultSet)
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private
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FResults: TIBXOUTPUTSQLDA;
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FCursorSeqNo: integer;
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public
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constructor Create(aResults: TIBXOUTPUTSQLDA);
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destructor Destroy; override;
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{IResultSet}
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function FetchNext: boolean;
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function GetCursorName: AnsiString;
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function GetTransaction: ITransaction; override;
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function IsEof: boolean;
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procedure Close;
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end;
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{ TFB25Statement }
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TFB25Statement = class(TFBStatement,IStatement)
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private
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FDBHandle: TISC_DB_HANDLE;
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FHandle: TISC_STMT_HANDLE;
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FSQLParams: TIBXINPUTSQLDA;
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FSQLRecord: TIBXOUTPUTSQLDA;
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FCursor: AnsiString; { Cursor name...}
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FCursorSeqNo: integer;
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procedure GetPerfCounters(var counters: TPerfStatistics);
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protected
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procedure CheckHandle; override;
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procedure GetDsqlInfo(info_request: byte; buffer: ISQLInfoResults); override;
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procedure InternalPrepare; override;
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function InternalExecute(aTransaction: ITransaction): IResults; override;
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function InternalOpenCursor(aTransaction: ITransaction): IResultSet; override;
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procedure FreeHandle; override;
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procedure InternalClose(Force: boolean); override;
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public
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constructor Create(Attachment: TFB25Attachment; Transaction: ITransaction;
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sql: AnsiString; aSQLDialect: integer);
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constructor CreateWithParameterNames(Attachment: TFB25Attachment;
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Transaction: ITransaction; sql: AnsiString; aSQLDialect: integer; GenerateParamNames: boolean);
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destructor Destroy; override;
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function FetchNext: boolean;
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public
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{IStatement}
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function GetSQLParams: ISQLParams; override;
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function GetMetaData: IMetaData; override;
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function GetPlan: AnsiString;
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function IsPrepared: boolean;
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function CreateBlob(column: TColumnMetaData): IBlob; override;
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function CreateArray(column: TColumnMetaData): IArray; override;
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procedure SetRetainInterfaces(aValue: boolean); override;
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property Handle: TISC_STMT_HANDLE read FHandle;
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end;
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implementation
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uses IBUtils, FBMessages, FBBlob, FB25Blob, variants, IBErrorCodes, FBArray, FB25Array
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{$IFDEF UNIX}, BaseUnix {$ENDIF};
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283 |
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{ TIBXSQLVAR }
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function TIBXSQLVAR.GetSQLType: cardinal;
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begin
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result := FXSQLVAR^.sqltype and (not 1);
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end;
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function TIBXSQLVAR.GetSubtype: integer;
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begin
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if GetSQLType = SQL_BLOB then
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result := FXSQLVAR^.sqlsubtype
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else
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result := 0;
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end;
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function TIBXSQLVAR.GetAliasName: AnsiString;
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begin
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result := strpas(FXSQLVAR^.aliasname);
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end;
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function TIBXSQLVAR.GetFieldName: AnsiString;
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begin
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result := strpas(FXSQLVAR^.sqlname);
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end;
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function TIBXSQLVAR.GetOwnerName: AnsiString;
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begin
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result := strpas(FXSQLVAR^.ownname);
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end;
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313 |
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function TIBXSQLVAR.GetRelationName: AnsiString;
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begin
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result := strpas(FXSQLVAR^.relname);
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end;
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318 |
|
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function TIBXSQLVAR.GetScale: integer;
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begin
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if GetSQLType = SQL_BLOB then
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result := 0
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else
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result := FXSQLVAR^.sqlscale;
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end;
|
326 |
|
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function TIBXSQLVAR.GetCharSetID: cardinal;
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328 |
begin
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329 |
result := 0;
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330 |
case SQLType of
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SQL_VARYING, SQL_TEXT:
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332 |
{see http://firebirdsql.org/rlsnotesh/rlsnotes210.html}
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result := FXSQLVAR^.sqlsubtype and $FF;
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334 |
|
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SQL_BLOB:
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336 |
if (SQLSubType = 1) then
|
337 |
{see http://firebirdsql.org/rlsnotesh/rlsnotes210.html}
|
338 |
result := FXSQLVAR^.sqlscale and $FF;
|
339 |
|
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SQL_ARRAY:
|
341 |
if (GetRelationName <> '') and (GetFieldName <> '') then
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result := GetArrayMetaData.GetCharSetID;
|
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end;
|
344 |
end;
|
345 |
|
346 |
function TIBXSQLVAR.GetCodePage: TSystemCodePage;
|
347 |
begin
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348 |
result := CP_NONE;
|
349 |
with Statement.GetAttachment do
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CharSetID2CodePage(GetCharSetID,result);
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end;
|
352 |
|
353 |
function TIBXSQLVAR.GetIsNull: Boolean;
|
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begin
|
355 |
result := IsNullable and (FNullIndicator = -1);
|
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end;
|
357 |
|
358 |
function TIBXSQLVAR.GetIsNullable: boolean;
|
359 |
begin
|
360 |
result := (FXSQLVAR^.sqltype and 1 = 1);
|
361 |
end;
|
362 |
|
363 |
function TIBXSQLVAR.GetSQLData: PByte;
|
364 |
begin
|
365 |
Result := FXSQLVAR^.sqldata;
|
366 |
end;
|
367 |
|
368 |
function TIBXSQLVAR.GetDataLength: cardinal;
|
369 |
begin
|
370 |
Result := FXSQLVAR^.sqllen;
|
371 |
end;
|
372 |
|
373 |
function TIBXSQLVAR.GetArrayMetaData: IArrayMetaData;
|
374 |
begin
|
375 |
if GetSQLType <> SQL_ARRAY then
|
376 |
IBError(ibxeInvalidDataConversion,[nil]);
|
377 |
|
378 |
if FArrayMetaData = nil then
|
379 |
FArrayMetaData := TFB25ArrayMetaData.Create(FStatement.GetAttachment as TFB25Attachment,
|
380 |
FStatement.GetTransaction as TFB25Transaction,
|
381 |
GetRelationName,GetFieldName);
|
382 |
Result := FArrayMetaData;
|
383 |
end;
|
384 |
|
385 |
function TIBXSQLVAR.GetBlobMetaData: IBlobMetaData;
|
386 |
begin
|
387 |
if GetSQLType <> SQL_BLOB then
|
388 |
IBError(ibxeInvalidDataConversion,[nil]);
|
389 |
|
390 |
if FBlobMetaData = nil then
|
391 |
FBlobMetaData := TFB25BlobMetaData.Create(FStatement.GetAttachment as TFB25Attachment,
|
392 |
FStatement.GetTransaction as TFB25Transaction,
|
393 |
GetRelationName,GetFieldName,GetSubType);
|
394 |
(FBlobMetaData as TFBBlobMetaData).SetCharSetID(GetCharSetID);
|
395 |
Result := FBlobMetaData;
|
396 |
end;
|
397 |
|
398 |
function TIBXSQLVAR.GetAsArray(Array_ID: TISC_QUAD): IArray;
|
399 |
begin
|
400 |
if SQLType <> SQL_ARRAY then
|
401 |
IBError(ibxeInvalidDataConversion,[nil]);
|
402 |
|
403 |
if IsNull then
|
404 |
Result := nil
|
405 |
else
|
406 |
begin
|
407 |
if FArray = nil then
|
408 |
FArray := TFB25Array.Create(FStatement.GetAttachment as TFB25Attachment,
|
409 |
TIBXSQLDA(Parent).GetTransaction,
|
410 |
GetArrayMetaData,Array_ID);
|
411 |
Result := FArray;
|
412 |
end;
|
413 |
end;
|
414 |
|
415 |
function TIBXSQLVAR.GetAsBlob(Blob_ID: TISC_QUAD; BPB: IBPB): IBlob;
|
416 |
begin
|
417 |
if FBlob <> nil then
|
418 |
Result := FBlob
|
419 |
else
|
420 |
begin
|
421 |
if SQLType <> SQL_BLOB then
|
422 |
IBError(ibxeInvalidDataConversion, [nil]);
|
423 |
if IsNull then
|
424 |
Result := nil
|
425 |
else
|
426 |
Result := TFB25Blob.Create(FStatement.GetAttachment as TFB25Attachment,
|
427 |
TIBXSQLDA(Parent).GetTransaction,
|
428 |
GetBlobMetaData,
|
429 |
Blob_ID,BPB);
|
430 |
FBlob := Result;
|
431 |
end;
|
432 |
end;
|
433 |
|
434 |
function TIBXSQLVAR.CreateBlob: IBlob;
|
435 |
begin
|
436 |
Result := TFB25Blob.Create(FStatement.GetAttachment as TFB25Attachment,
|
437 |
FStatement.GetTransaction as TFB25Transaction,GetSubType,GetCharSetID,nil);
|
438 |
end;
|
439 |
|
440 |
procedure TIBXSQLVAR.Initialize;
|
441 |
begin
|
442 |
inherited Initialize;
|
443 |
FOwnsSQLData := true;
|
444 |
with FirebirdClientAPI, FXSQLVar^ do
|
445 |
begin
|
446 |
case sqltype and (not 1) of
|
447 |
SQL_TEXT, SQL_TYPE_DATE, SQL_TYPE_TIME, SQL_TIMESTAMP,
|
448 |
SQL_BLOB, SQL_ARRAY, SQL_QUAD, SQL_SHORT, SQL_BOOLEAN,
|
449 |
SQL_LONG, SQL_INT64, SQL_DOUBLE, SQL_FLOAT, SQL_D_FLOAT: begin
|
450 |
if (sqllen = 0) then
|
451 |
{ Make sure you get a valid pointer anyway
|
452 |
select '' from foo }
|
453 |
IBAlloc(sqldata, 0, 1)
|
454 |
else
|
455 |
IBAlloc(sqldata, 0, sqllen)
|
456 |
end;
|
457 |
SQL_VARYING: begin
|
458 |
IBAlloc(sqldata, 0, sqllen + 2);
|
459 |
end;
|
460 |
else
|
461 |
IBError(ibxeUnknownSQLDataType, [sqltype and (not 1)])
|
462 |
end;
|
463 |
if (sqltype and 1 = 1) then
|
464 |
begin
|
465 |
sqlInd := @FNullIndicator;
|
466 |
FNullIndicator := -1;
|
467 |
end
|
468 |
else
|
469 |
sqlInd := nil;
|
470 |
end;
|
471 |
end;
|
472 |
|
473 |
procedure TIBXSQLVAR.SetIsNull(Value: Boolean);
|
474 |
begin
|
475 |
if Value then
|
476 |
begin
|
477 |
IsNullable := true;
|
478 |
FNullIndicator := -1;
|
479 |
Changed;
|
480 |
end
|
481 |
else
|
482 |
if ((not Value) and IsNullable) then
|
483 |
begin
|
484 |
FNullIndicator := 0;
|
485 |
Changed;
|
486 |
end;
|
487 |
end;
|
488 |
|
489 |
procedure TIBXSQLVAR.SetIsNullable(Value: Boolean);
|
490 |
begin
|
491 |
if (Value <> IsNullable) then
|
492 |
begin
|
493 |
if Value then
|
494 |
begin
|
495 |
FXSQLVAR^.sqltype := FXSQLVAR^.sqltype or 1;
|
496 |
FNullIndicator := 0;
|
497 |
FXSQLVAR^.sqlInd := @FNullIndicator;
|
498 |
end
|
499 |
else
|
500 |
begin
|
501 |
FXSQLVAR^.sqltype := FXSQLVAR^.sqltype and (not 1);
|
502 |
FXSQLVAR^.sqlind := nil;
|
503 |
end;
|
504 |
end;
|
505 |
Changed;
|
506 |
end;
|
507 |
|
508 |
procedure TIBXSQLVAR.SetSQLData(AValue: PByte; len: cardinal);
|
509 |
begin
|
510 |
if FOwnsSQLData then
|
511 |
FreeMem(FXSQLVAR^.sqldata);
|
512 |
FXSQLVAR^.sqldata := AValue;
|
513 |
FXSQLVAR^.sqllen := len;
|
514 |
FOwnsSQLData := false;
|
515 |
Changed;
|
516 |
end;
|
517 |
|
518 |
procedure TIBXSQLVAR.SetScale(aValue: integer);
|
519 |
begin
|
520 |
FXSQLVAR^.sqlscale := aValue;
|
521 |
Changed;
|
522 |
end;
|
523 |
|
524 |
procedure TIBXSQLVAR.SetDataLength(len: cardinal);
|
525 |
begin
|
526 |
if not FOwnsSQLData then
|
527 |
FXSQLVAR^.sqldata := nil;
|
528 |
FXSQLVAR^.sqllen := len;
|
529 |
with FirebirdClientAPI do
|
530 |
IBAlloc(FXSQLVAR^.sqldata, 0, FXSQLVAR^.sqllen);
|
531 |
FOwnsSQLData := true;
|
532 |
Changed;
|
533 |
end;
|
534 |
|
535 |
procedure TIBXSQLVAR.SetSQLType(aValue: cardinal);
|
536 |
begin
|
537 |
FXSQLVAR^.sqltype := aValue or (FXSQLVAR^.sqltype and 1);
|
538 |
Changed;
|
539 |
end;
|
540 |
|
541 |
procedure TIBXSQLVAR.SetCharSetID(aValue: cardinal);
|
542 |
begin
|
543 |
if aValue <> GetCharSetID then
|
544 |
begin
|
545 |
case SQLType of
|
546 |
SQL_VARYING, SQL_TEXT:
|
547 |
FXSQLVAR^.sqlsubtype := (aValue and $FF) or (FXSQLVAR^.sqlsubtype and not $FF);
|
548 |
|
549 |
SQL_BLOB,
|
550 |
SQL_ARRAY:
|
551 |
IBError(ibxeInvalidDataConversion,[nil]);
|
552 |
end;
|
553 |
Changed;
|
554 |
end;
|
555 |
end;
|
556 |
|
557 |
constructor TIBXSQLVAR.Create(aParent: TIBXSQLDA; aIndex: integer);
|
558 |
begin
|
559 |
inherited Create(aParent,aIndex);
|
560 |
FStatement := aParent.Statement;
|
561 |
end;
|
562 |
|
563 |
procedure TIBXSQLVAR.FreeSQLData;
|
564 |
begin
|
565 |
if FOwnsSQLData then
|
566 |
FreeMem(FXSQLVAR^.sqldata);
|
567 |
FXSQLVAR^.sqldata := nil;
|
568 |
FOwnsSQLData := true;
|
569 |
end;
|
570 |
|
571 |
procedure TIBXSQLVAR.RowChange;
|
572 |
begin
|
573 |
inherited RowChange;
|
574 |
FBlob := nil;
|
575 |
FArray := nil;
|
576 |
end;
|
577 |
|
578 |
|
579 |
{ TResultSet }
|
580 |
|
581 |
constructor TResultSet.Create(aResults: TIBXOUTPUTSQLDA);
|
582 |
begin
|
583 |
inherited Create(aResults);
|
584 |
FResults := aResults;
|
585 |
FCursorSeqNo := aResults.FStatement.FCursorSeqNo;
|
586 |
end;
|
587 |
|
588 |
destructor TResultSet.Destroy;
|
589 |
begin
|
590 |
Close;
|
591 |
inherited Destroy;
|
592 |
end;
|
593 |
|
594 |
function TResultSet.FetchNext: boolean;
|
595 |
var i: integer;
|
596 |
begin
|
597 |
CheckActive;
|
598 |
Result := FResults.FStatement.FetchNext;
|
599 |
if Result then
|
600 |
for i := 0 to getCount - 1 do
|
601 |
FResults.Column[i].RowChange;
|
602 |
end;
|
603 |
|
604 |
function TResultSet.GetCursorName: AnsiString;
|
605 |
begin
|
606 |
Result := FResults.FStatement.FCursor;
|
607 |
end;
|
608 |
|
609 |
function TResultSet.GetTransaction: ITransaction;
|
610 |
begin
|
611 |
Result := FResults.GetTransaction;
|
612 |
end;
|
613 |
|
614 |
function TResultSet.IsEof: boolean;
|
615 |
begin
|
616 |
Result := FResults.FStatement.FEof;
|
617 |
end;
|
618 |
|
619 |
procedure TResultSet.Close;
|
620 |
begin
|
621 |
if FCursorSeqNo = FResults.FStatement.FCursorSeqNo then
|
622 |
FResults.FStatement.Close;
|
623 |
end;
|
624 |
|
625 |
{ TIBXINPUTSQLDA }
|
626 |
|
627 |
procedure TIBXINPUTSQLDA.Bind;
|
628 |
begin
|
629 |
if Count = 0 then
|
630 |
Count := 1;
|
631 |
with Firebird25ClientAPI do
|
632 |
begin
|
633 |
if (FXSQLDA <> nil) then
|
634 |
if isc_dsql_describe_bind(StatusVector, @(FStatement.Handle), FStatement.SQLDialect,
|
635 |
FXSQLDA) > 0 then
|
636 |
IBDataBaseError;
|
637 |
|
638 |
if FXSQLDA^.sqld > FXSQLDA^.sqln then
|
639 |
begin
|
640 |
Count := FXSQLDA^.sqld;
|
641 |
if isc_dsql_describe_bind(StatusVector, @(FStatement.Handle), FStatement.SQLDialect,
|
642 |
FXSQLDA) > 0 then
|
643 |
IBDataBaseError;
|
644 |
end
|
645 |
else
|
646 |
if FXSQLDA^.sqld = 0 then
|
647 |
Count := 0;
|
648 |
end;
|
649 |
Initialize;
|
650 |
end;
|
651 |
|
652 |
function TIBXINPUTSQLDA.IsInputDataArea: boolean;
|
653 |
begin
|
654 |
Result := true;
|
655 |
end;
|
656 |
|
657 |
{ TIBXOUTPUTSQLDA }
|
658 |
|
659 |
procedure TIBXOUTPUTSQLDA.Bind;
|
660 |
begin
|
661 |
{ Allocate an initial output descriptor (with one column) }
|
662 |
Count := 1;
|
663 |
with Firebird25ClientAPI do
|
664 |
begin
|
665 |
{ Using isc_dsql_describe, get the right size for the columns... }
|
666 |
if isc_dsql_describe(StatusVector, @(FStatement.Handle), FStatement.SQLDialect, FXSQLDA) > 0 then
|
667 |
IBDataBaseError;
|
668 |
|
669 |
if FXSQLDA^.sqld > FXSQLDA^.sqln then
|
670 |
begin
|
671 |
Count := FXSQLDA^.sqld;
|
672 |
if isc_dsql_describe(StatusVector, @(FStatement.Handle), FStatement.SQLDialect, FXSQLDA) > 0 then
|
673 |
IBDataBaseError;
|
674 |
end
|
675 |
else
|
676 |
if FXSQLDA^.sqld = 0 then
|
677 |
Count := 0;
|
678 |
end;
|
679 |
Initialize;
|
680 |
SetUniqueRelationName;
|
681 |
end;
|
682 |
|
683 |
function TIBXOUTPUTSQLDA.GetTransaction: TFB25Transaction;
|
684 |
begin
|
685 |
Result := FTransaction;
|
686 |
end;
|
687 |
|
688 |
procedure TIBXOUTPUTSQLDA.GetData(index: integer; var aIsNull:boolean; var len: short;
|
689 |
var data: PByte);
|
690 |
begin
|
691 |
with TIBXSQLVAR(Column[index]), FXSQLVAR^ do
|
692 |
begin
|
693 |
aIsNull := (sqltype and 1 = 1) and (FNullIndicator = -1);
|
694 |
data := sqldata;
|
695 |
len := sqllen;
|
696 |
if not IsNull and ((sqltype and (not 1)) = SQL_VARYING) then
|
697 |
begin
|
698 |
with FirebirdClientAPI do
|
699 |
len := DecodeInteger(data,2);
|
700 |
Inc(data,2);
|
701 |
end;
|
702 |
end;
|
703 |
end;
|
704 |
|
705 |
function TIBXOUTPUTSQLDA.IsInputDataArea: boolean;
|
706 |
begin
|
707 |
Result := false;
|
708 |
end;
|
709 |
|
710 |
{ TIBXSQLDA }
|
711 |
constructor TIBXSQLDA.Create(aStatement: TFB25Statement);
|
712 |
begin
|
713 |
inherited Create;
|
714 |
FStatement := aStatement;
|
715 |
FSize := 0;
|
716 |
// writeln('Creating ',ClassName);
|
717 |
end;
|
718 |
|
719 |
destructor TIBXSQLDA.Destroy;
|
720 |
begin
|
721 |
FreeXSQLDA;
|
722 |
// writeln('Destroying ',ClassName);
|
723 |
inherited Destroy;
|
724 |
end;
|
725 |
|
726 |
function TIBXSQLDA.CheckStatementStatus(Request: TStatementStatus): boolean;
|
727 |
begin
|
728 |
Result := false;
|
729 |
case Request of
|
730 |
ssPrepared:
|
731 |
Result := FStatement.IsPrepared;
|
732 |
|
733 |
ssExecuteResults:
|
734 |
Result :=FStatement.FSingleResults;
|
735 |
|
736 |
ssCursorOpen:
|
737 |
Result := FStatement.FOpen;
|
738 |
|
739 |
ssBOF:
|
740 |
Result := FStatement.FBOF;
|
741 |
|
742 |
ssEOF:
|
743 |
Result := FStatement.FEOF;
|
744 |
end;
|
745 |
end;
|
746 |
|
747 |
function TIBXSQLDA.ColumnsInUseCount: integer;
|
748 |
begin
|
749 |
Result := FCount;
|
750 |
end;
|
751 |
|
752 |
function TIBXSQLDA.GetRecordSize: Integer;
|
753 |
begin
|
754 |
result := SizeOf(TIBXSQLDA) + XSQLDA_LENGTH(FSize);
|
755 |
end;
|
756 |
|
757 |
function TIBXSQLDA.GetXSQLDA: PXSQLDA;
|
758 |
begin
|
759 |
result := FXSQLDA;
|
760 |
end;
|
761 |
|
762 |
function TIBXSQLDA.GetTransactionSeqNo: integer;
|
763 |
begin
|
764 |
Result := FTransactionSeqNo;
|
765 |
end;
|
766 |
|
767 |
procedure TIBXSQLDA.Initialize;
|
768 |
begin
|
769 |
if FXSQLDA <> nil then
|
770 |
inherited Initialize;
|
771 |
end;
|
772 |
|
773 |
function TIBXSQLDA.StateChanged(var ChangeSeqNo: integer): boolean;
|
774 |
begin
|
775 |
Result := FStatement.ChangeSeqNo <> ChangeSeqNo;
|
776 |
if Result then
|
777 |
ChangeSeqNo := FStatement.ChangeSeqNo;
|
778 |
end;
|
779 |
|
780 |
function TIBXSQLDA.GetTransaction: TFB25Transaction;
|
781 |
begin
|
782 |
Result := FStatement.GetTransaction as TFB25Transaction;
|
783 |
end;
|
784 |
|
785 |
procedure TIBXSQLDA.SetCount(Value: Integer);
|
786 |
var
|
787 |
i, OldSize: Integer;
|
788 |
p : PXSQLVAR;
|
789 |
begin
|
790 |
FCount := Value;
|
791 |
if FCount = 0 then
|
792 |
FUniqueRelationName := ''
|
793 |
else
|
794 |
begin
|
795 |
if FSize > 0 then
|
796 |
OldSize := XSQLDA_LENGTH(FSize)
|
797 |
else
|
798 |
OldSize := 0;
|
799 |
if Count > FSize then
|
800 |
begin
|
801 |
Firebird25ClientAPI.IBAlloc(FXSQLDA, OldSize, XSQLDA_LENGTH(Count));
|
802 |
SetLength(FColumnList, FCount);
|
803 |
FXSQLDA^.version := SQLDA_VERSION1;
|
804 |
p := @FXSQLDA^.sqlvar[0];
|
805 |
for i := 0 to Count - 1 do
|
806 |
begin
|
807 |
if i >= FSize then
|
808 |
FColumnList[i] := TIBXSQLVAR.Create(self,i);
|
809 |
TIBXSQLVAR(Column[i]).FXSQLVAR := p;
|
810 |
p := Pointer(PAnsiChar(p) + sizeof(FXSQLDA^.sqlvar));
|
811 |
end;
|
812 |
FSize := inherited Count;
|
813 |
end;
|
814 |
if FSize > 0 then
|
815 |
begin
|
816 |
FXSQLDA^.sqln := Value;
|
817 |
FXSQLDA^.sqld := Value;
|
818 |
end;
|
819 |
end;
|
820 |
end;
|
821 |
|
822 |
procedure TIBXSQLDA.FreeXSQLDA;
|
823 |
var i: integer;
|
824 |
begin
|
825 |
if FXSQLDA <> nil then
|
826 |
begin
|
827 |
// writeln('SQLDA Cleanup');
|
828 |
for i := 0 to Count - 1 do
|
829 |
TIBXSQLVAR(Column[i]).FreeSQLData;
|
830 |
FreeMem(FXSQLDA);
|
831 |
FXSQLDA := nil;
|
832 |
end;
|
833 |
for i := 0 to FSize - 1 do
|
834 |
TIBXSQLVAR(Column[i]).Free;
|
835 |
SetLength(FColumnList,0);
|
836 |
FSize := 0;
|
837 |
end;
|
838 |
|
839 |
function TIBXSQLDA.GetStatement: IStatement;
|
840 |
begin
|
841 |
Result := FStatement;
|
842 |
end;
|
843 |
|
844 |
function TIBXSQLDA.GetPrepareSeqNo: integer;
|
845 |
begin
|
846 |
Result := FStatement.FPrepareSeqNo;
|
847 |
end;
|
848 |
|
849 |
{ TFB25Statement }
|
850 |
|
851 |
procedure TFB25Statement.GetPerfCounters(var counters: TPerfStatistics);
|
852 |
var DBInfo: IDBInformation;
|
853 |
i: integer;
|
854 |
{$IFDEF UNIX}
|
855 |
times: tms;
|
856 |
{$ENDIF}
|
857 |
begin
|
858 |
{$IFDEF UNIX}
|
859 |
FpTimes(times);
|
860 |
counters[psUserTime] := times.tms_utime;
|
861 |
{$ELSE}
|
862 |
counters[psUserTime] := 0;
|
863 |
{$ENDIF}
|
864 |
counters[psRealTime] := TimeStampToMSecs(DateTimeToTimeStamp(Now));
|
865 |
|
866 |
DBInfo := GetAttachment.GetDBInformation([isc_info_reads,isc_info_writes,
|
867 |
isc_info_fetches, isc_info_num_buffers, isc_info_current_memory,
|
868 |
isc_info_max_memory]);
|
869 |
if DBInfo <> nil then
|
870 |
begin
|
871 |
for i := 0 to DBInfo.Count - 1 do
|
872 |
with DBInfo[i] do
|
873 |
case getItemType of
|
874 |
isc_info_reads:
|
875 |
counters[psReads] := AsInteger;
|
876 |
isc_info_writes:
|
877 |
counters[psWrites] := AsInteger;
|
878 |
isc_info_fetches:
|
879 |
counters[psFetches] := AsInteger;
|
880 |
isc_info_num_buffers:
|
881 |
counters[psBuffers] := AsInteger;
|
882 |
isc_info_current_memory:
|
883 |
counters[psCurrentMemory] := AsInteger;
|
884 |
isc_info_max_memory:
|
885 |
counters[psMaxMemory] := AsInteger;
|
886 |
end;
|
887 |
end;
|
888 |
end;
|
889 |
|
890 |
procedure TFB25Statement.CheckHandle;
|
891 |
begin
|
892 |
if FHandle = nil then
|
893 |
IBError(ibxeInvalidStatementHandle,[nil]);
|
894 |
end;
|
895 |
|
896 |
procedure TFB25Statement.GetDsqlInfo(info_request: byte; buffer: ISQLInfoResults
|
897 |
);
|
898 |
begin
|
899 |
with Firebird25ClientAPI, buffer as TSQLInfoResultsBuffer do
|
900 |
if isc_dsql_sql_info(StatusVector, @(FHandle), 1, @info_request,
|
901 |
GetBufSize, Buffer) > 0 then
|
902 |
IBDatabaseError;
|
903 |
end;
|
904 |
|
905 |
procedure TFB25Statement.InternalPrepare;
|
906 |
var
|
907 |
RB: ISQLInfoResults;
|
908 |
TRHandle: TISC_TR_HANDLE;
|
909 |
begin
|
910 |
if FPrepared then
|
911 |
Exit;
|
912 |
if (FSQL = '') then
|
913 |
IBError(ibxeEmptyQuery, [nil]);
|
914 |
try
|
915 |
CheckTransaction(FTransactionIntf);
|
916 |
with Firebird25ClientAPI do
|
917 |
begin
|
918 |
Call(isc_dsql_alloc_statement2(StatusVector, @(FDBHandle),
|
919 |
@FHandle), True);
|
920 |
TRHandle := (FTransactionIntf as TFB25Transaction).Handle;
|
921 |
if FHasParamNames then
|
922 |
begin
|
923 |
if FProcessedSQL = '' then
|
924 |
FSQLParams.PreprocessSQL(FSQL,FGenerateParamNames,FProcessedSQL);
|
925 |
Call(isc_dsql_prepare(StatusVector, @(TRHandle), @FHandle, 0,
|
926 |
PAnsiChar(FProcessedSQL), FSQLDialect, nil), True);
|
927 |
end
|
928 |
else
|
929 |
Call(isc_dsql_prepare(StatusVector, @(TRHandle), @FHandle, 0,
|
930 |
PAnsiChar(FSQL), FSQLDialect, nil), True);
|
931 |
end;
|
932 |
{ After preparing the statement, query the stmt type and possibly
|
933 |
create a FSQLRecord "holder" }
|
934 |
{ Get the type of the statement }
|
935 |
RB := GetDsqlInfo(isc_info_sql_stmt_type);
|
936 |
if RB.Count > 0 then
|
937 |
FSQLStatementType := TIBSQLStatementTypes(RB[0].GetAsInteger)
|
938 |
else
|
939 |
FSQLStatementType := SQLUnknown;
|
940 |
|
941 |
case FSQLStatementType of
|
942 |
SQLGetSegment,
|
943 |
SQLPutSegment,
|
944 |
SQLStartTransaction: begin
|
945 |
FreeHandle;
|
946 |
IBError(ibxeNotPermitted, [nil]);
|
947 |
end;
|
948 |
SQLCommit,
|
949 |
SQLRollback,
|
950 |
SQLDDL, SQLSetGenerator,
|
951 |
SQLInsert, SQLUpdate, SQLDelete, SQLSelect, SQLSelectForUpdate,
|
952 |
SQLExecProcedure:
|
953 |
begin
|
954 |
{set up input sqlda}
|
955 |
FSQLParams.Bind;
|
956 |
|
957 |
{setup output sqlda}
|
958 |
if FSQLStatementType in [SQLSelect, SQLSelectForUpdate,
|
959 |
SQLExecProcedure] then
|
960 |
FSQLRecord.Bind;
|
961 |
end;
|
962 |
end;
|
963 |
except
|
964 |
on E: Exception do begin
|
965 |
if (FHandle <> nil) then
|
966 |
FreeHandle;
|
967 |
if E is EIBInterBaseError then
|
968 |
raise EIBInterBaseError.Create(EIBInterBaseError(E).SQLCode,
|
969 |
EIBInterBaseError(E).IBErrorCode,
|
970 |
EIBInterBaseError(E).Message +
|
971 |
sSQLErrorSeparator + FSQL)
|
972 |
else
|
973 |
raise;
|
974 |
end;
|
975 |
end;
|
976 |
FPrepared := true;
|
977 |
FSingleResults := false;
|
978 |
if RetainInterfaces then
|
979 |
begin
|
980 |
SetRetainInterfaces(false);
|
981 |
SetRetainInterfaces(true);
|
982 |
end;
|
983 |
Inc(FPrepareSeqNo);
|
984 |
Inc(FChangeSeqNo);
|
985 |
with FTransactionIntf as TFB25Transaction do
|
986 |
begin
|
987 |
FSQLParams.FTransactionSeqNo := TransactionSeqNo;
|
988 |
FSQLRecord.FTransactionSeqNo := TransactionSeqNo;
|
989 |
end;
|
990 |
end;
|
991 |
|
992 |
function TFB25Statement.InternalExecute(aTransaction: ITransaction): IResults;
|
993 |
var TRHandle: TISC_TR_HANDLE;
|
994 |
begin
|
995 |
Result := nil;
|
996 |
FBOF := false;
|
997 |
FEOF := false;
|
998 |
FSingleResults := false;
|
999 |
CheckTransaction(aTransaction);
|
1000 |
if not FPrepared then
|
1001 |
InternalPrepare;
|
1002 |
CheckHandle;
|
1003 |
if aTransaction <> FTransactionIntf then
|
1004 |
AddMonitor(aTransaction as TFB25Transaction);
|
1005 |
if (FSQLParams.FTransactionSeqNo < (FTransactionIntf as TFB25transaction).TransactionSeqNo) then
|
1006 |
IBError(ibxeInterfaceOutofDate,[nil]);
|
1007 |
|
1008 |
try
|
1009 |
TRHandle := (aTransaction as TFB25Transaction).Handle;
|
1010 |
with Firebird25ClientAPI do
|
1011 |
begin
|
1012 |
if FCollectStatistics then
|
1013 |
GetPerfCounters(FBeforeStats);
|
1014 |
|
1015 |
case FSQLStatementType of
|
1016 |
SQLSelect:
|
1017 |
IBError(ibxeIsAExecuteProcedure,[]);
|
1018 |
|
1019 |
SQLExecProcedure:
|
1020 |
begin
|
1021 |
Call(isc_dsql_execute2(StatusVector,
|
1022 |
@(TRHandle),
|
1023 |
@FHandle,
|
1024 |
SQLDialect,
|
1025 |
FSQLParams.AsXSQLDA,
|
1026 |
FSQLRecord.AsXSQLDA), True);
|
1027 |
Result := TResults.Create(FSQLRecord);
|
1028 |
FSingleResults := true;
|
1029 |
end
|
1030 |
else
|
1031 |
Call(isc_dsql_execute(StatusVector,
|
1032 |
@(TRHandle),
|
1033 |
@FHandle,
|
1034 |
SQLDialect,
|
1035 |
FSQLParams.AsXSQLDA), True);
|
1036 |
|
1037 |
end;
|
1038 |
if FCollectStatistics then
|
1039 |
begin
|
1040 |
GetPerfCounters(FAfterStats);
|
1041 |
FStatisticsAvailable := true;
|
1042 |
end;
|
1043 |
end;
|
1044 |
finally
|
1045 |
if aTransaction <> FTransactionIntf then
|
1046 |
RemoveMonitor(aTransaction as TFB25Transaction);
|
1047 |
end;
|
1048 |
FExecTransactionIntf := aTransaction;
|
1049 |
FSQLRecord.FTransaction := aTransaction as TFB25Transaction;
|
1050 |
FSQLRecord.FTransactionSeqNo := FSQLRecord.FTransaction.TransactionSeqNo;
|
1051 |
Inc(FChangeSeqNo);
|
1052 |
end;
|
1053 |
|
1054 |
function TFB25Statement.InternalOpenCursor(aTransaction: ITransaction
|
1055 |
): IResultSet;
|
1056 |
var TRHandle: TISC_TR_HANDLE;
|
1057 |
GUID : TGUID;
|
1058 |
begin
|
1059 |
if FSQLStatementType <> SQLSelect then
|
1060 |
IBError(ibxeIsASelectStatement,[]);
|
1061 |
|
1062 |
CheckTransaction(aTransaction);
|
1063 |
if not FPrepared then
|
1064 |
InternalPrepare;
|
1065 |
CheckHandle;
|
1066 |
if aTransaction <> FTransactionIntf then
|
1067 |
AddMonitor(aTransaction as TFB25Transaction);
|
1068 |
if (FSQLParams.FTransactionSeqNo < (FTransactionIntf as TFB25transaction).TransactionSeqNo) then
|
1069 |
IBError(ibxeInterfaceOutofDate,[nil]);
|
1070 |
|
1071 |
with Firebird25ClientAPI do
|
1072 |
begin
|
1073 |
if FCollectStatistics then
|
1074 |
GetPerfCounters(FBeforeStats);
|
1075 |
|
1076 |
TRHandle := (aTransaction as TFB25Transaction).Handle;
|
1077 |
Call(isc_dsql_execute2(StatusVector,
|
1078 |
@(TRHandle),
|
1079 |
@FHandle,
|
1080 |
SQLDialect,
|
1081 |
FSQLParams.AsXSQLDA,
|
1082 |
nil), True);
|
1083 |
if FCursor = '' then
|
1084 |
begin
|
1085 |
CreateGuid(GUID);
|
1086 |
FCursor := GUIDToString(GUID);
|
1087 |
Call(
|
1088 |
isc_dsql_set_cursor_name(StatusVector, @FHandle, PAnsiChar(FCursor), 0),
|
1089 |
True);
|
1090 |
end;
|
1091 |
|
1092 |
if FCollectStatistics then
|
1093 |
begin
|
1094 |
GetPerfCounters(FAfterStats);
|
1095 |
FStatisticsAvailable := true;
|
1096 |
end;
|
1097 |
end;
|
1098 |
Inc(FCursorSeqNo);
|
1099 |
FSingleResults := false;
|
1100 |
FOpen := True;
|
1101 |
FExecTransactionIntf := aTransaction;
|
1102 |
FBOF := true;
|
1103 |
FEOF := false;
|
1104 |
FSQLRecord.FTransaction := aTransaction as TFB25Transaction;
|
1105 |
FSQLRecord.FTransactionSeqNo := FSQLRecord.FTransaction.TransactionSeqNo;
|
1106 |
Result := TResultSet.Create(FSQLRecord);
|
1107 |
Inc(FChangeSeqNo);
|
1108 |
end;
|
1109 |
|
1110 |
procedure TFB25Statement.FreeHandle;
|
1111 |
var
|
1112 |
isc_res: ISC_STATUS;
|
1113 |
begin
|
1114 |
Close;
|
1115 |
ReleaseInterfaces;
|
1116 |
try
|
1117 |
if FHandle <> nil then
|
1118 |
with Firebird25ClientAPI do
|
1119 |
begin
|
1120 |
isc_res :=
|
1121 |
Call(isc_dsql_free_statement(StatusVector, @FHandle, DSQL_drop), False);
|
1122 |
if (StatusVector^ = 1) and (isc_res > 0) and (isc_res <> isc_bad_stmt_handle) then
|
1123 |
IBDataBaseError;
|
1124 |
end;
|
1125 |
finally
|
1126 |
FHandle := nil;
|
1127 |
FCursor := '';
|
1128 |
FPrepared := false;
|
1129 |
end;
|
1130 |
end;
|
1131 |
|
1132 |
procedure TFB25Statement.InternalClose(Force: boolean);
|
1133 |
var
|
1134 |
isc_res: ISC_STATUS;
|
1135 |
begin
|
1136 |
if (FHandle <> nil) and (SQLStatementType = SQLSelect) and FOpen then
|
1137 |
try
|
1138 |
with Firebird25ClientAPI do
|
1139 |
begin
|
1140 |
isc_res := Call(
|
1141 |
isc_dsql_free_statement(StatusVector, @FHandle, DSQL_close),
|
1142 |
False);
|
1143 |
if not Force and (StatusVector^ = 1) and (isc_res > 0) and
|
1144 |
not getStatus.CheckStatusVector(
|
1145 |
[isc_bad_stmt_handle, isc_dsql_cursor_close_err]) then
|
1146 |
IBDatabaseError;
|
1147 |
end;
|
1148 |
finally
|
1149 |
if (FSQLRecord.FTransaction <> nil) and (FSQLRecord.FTransaction <> (FTransactionIntf as TFB25Transaction)) then
|
1150 |
RemoveMonitor(FSQLRecord.FTransaction);
|
1151 |
FOpen := False;
|
1152 |
FExecTransactionIntf := nil;
|
1153 |
FSQLRecord.FTransaction := nil;
|
1154 |
Inc(FChangeSeqNo);
|
1155 |
end;
|
1156 |
end;
|
1157 |
|
1158 |
constructor TFB25Statement.Create(Attachment: TFB25Attachment;
|
1159 |
Transaction: ITransaction; sql: AnsiString; aSQLDialect: integer);
|
1160 |
begin
|
1161 |
inherited Create(Attachment,Transaction,sql,aSQLDialect);
|
1162 |
FDBHandle := Attachment.Handle;
|
1163 |
FSQLParams := TIBXINPUTSQLDA.Create(self);
|
1164 |
FSQLRecord := TIBXOUTPUTSQLDA.Create(self);
|
1165 |
InternalPrepare;
|
1166 |
end;
|
1167 |
|
1168 |
constructor TFB25Statement.CreateWithParameterNames(Attachment: TFB25Attachment;
|
1169 |
Transaction: ITransaction; sql: AnsiString; aSQLDialect: integer;
|
1170 |
GenerateParamNames: boolean);
|
1171 |
begin
|
1172 |
inherited CreateWithParameterNames(Attachment,Transaction,sql,aSQLDialect,GenerateParamNames);
|
1173 |
FDBHandle := Attachment.Handle;
|
1174 |
FSQLParams := TIBXINPUTSQLDA.Create(self);
|
1175 |
FSQLRecord := TIBXOUTPUTSQLDA.Create(self);
|
1176 |
InternalPrepare;
|
1177 |
end;
|
1178 |
|
1179 |
destructor TFB25Statement.Destroy;
|
1180 |
begin
|
1181 |
inherited Destroy;
|
1182 |
if assigned(FSQLParams) then FSQLParams.Free;
|
1183 |
if assigned(FSQLRecord) then FSQLRecord.Free;
|
1184 |
end;
|
1185 |
|
1186 |
function TFB25Statement.FetchNext: boolean;
|
1187 |
var
|
1188 |
fetch_res: ISC_STATUS;
|
1189 |
begin
|
1190 |
result := false;
|
1191 |
if not FOpen then
|
1192 |
IBError(ibxeSQLClosed, [nil]);
|
1193 |
if FEOF then
|
1194 |
IBError(ibxeEOF,[nil]);
|
1195 |
|
1196 |
with Firebird25ClientAPI do
|
1197 |
begin
|
1198 |
{ Go to the next record... }
|
1199 |
fetch_res :=
|
1200 |
Call(isc_dsql_fetch(StatusVector, @FHandle, SQLDialect, FSQLRecord.AsXSQLDA), False);
|
1201 |
if (fetch_res = 100) or (getStatus.CheckStatusVector([isc_dsql_cursor_err])) then
|
1202 |
begin
|
1203 |
FBOF := false;
|
1204 |
FEOF := true;
|
1205 |
Exit; {End of File}
|
1206 |
end
|
1207 |
else
|
1208 |
if (fetch_res > 0) then
|
1209 |
begin
|
1210 |
try
|
1211 |
IBDataBaseError;
|
1212 |
except
|
1213 |
Close;
|
1214 |
raise;
|
1215 |
end;
|
1216 |
end
|
1217 |
else
|
1218 |
begin
|
1219 |
FBOF := false;
|
1220 |
result := true;
|
1221 |
end;
|
1222 |
end;
|
1223 |
FSQLRecord.RowChange;
|
1224 |
if FEOF then
|
1225 |
Inc(FChangeSeqNo);
|
1226 |
end;
|
1227 |
|
1228 |
function TFB25Statement.GetSQLParams: ISQLParams;
|
1229 |
begin
|
1230 |
CheckHandle;
|
1231 |
if not HasInterface(0) then
|
1232 |
AddInterface(0,TSQLParams.Create(FSQLParams));
|
1233 |
Result := TSQLParams(GetInterface(0));
|
1234 |
end;
|
1235 |
|
1236 |
function TFB25Statement.GetMetaData: IMetaData;
|
1237 |
begin
|
1238 |
CheckHandle;
|
1239 |
if not HasInterface(1) then
|
1240 |
AddInterface(1, TMetaData.Create(FSQLRecord));
|
1241 |
Result := TMetaData(GetInterface(1));
|
1242 |
end;
|
1243 |
|
1244 |
function TFB25Statement.GetPlan: AnsiString;
|
1245 |
var
|
1246 |
RB: ISQLInfoResults;
|
1247 |
begin
|
1248 |
if (not (FSQLStatementType in [SQLSelect, SQLSelectForUpdate,
|
1249 |
{TODO: SQLExecProcedure, }
|
1250 |
SQLUpdate, SQLDelete])) then
|
1251 |
result := ''
|
1252 |
else
|
1253 |
begin
|
1254 |
RB := TSQLInfoResultsBuffer.Create(4*4096);
|
1255 |
GetDsqlInfo(isc_info_sql_get_plan,RB);
|
1256 |
if RB.Count > 0 then
|
1257 |
Result := RB[0].GetAsString;
|
1258 |
end;
|
1259 |
end;
|
1260 |
|
1261 |
function TFB25Statement.CreateBlob(column: TColumnMetaData): IBlob;
|
1262 |
begin
|
1263 |
if assigned(column) and (column.SQLType <> SQL_Blob) then
|
1264 |
IBError(ibxeNotABlob,[nil]);
|
1265 |
Result := TFB25Blob.Create(GetAttachment as TFB25Attachment,FExecTransactionIntf as TFB25Transaction,
|
1266 |
column.GetBlobMetaData,nil);
|
1267 |
end;
|
1268 |
|
1269 |
function TFB25Statement.CreateArray(column: TColumnMetaData): IArray;
|
1270 |
begin
|
1271 |
if assigned(column) and (column.SQLType <> SQL_ARRAY) then
|
1272 |
IBError(ibxeNotAnArray,[nil]);
|
1273 |
Result := TFB25Array.Create(GetAttachment as TFB25Attachment,FExecTransactionIntf as TFB25Transaction,
|
1274 |
column.GetArrayMetaData);
|
1275 |
end;
|
1276 |
|
1277 |
procedure TFB25Statement.SetRetainInterfaces(aValue: boolean);
|
1278 |
begin
|
1279 |
inherited SetRetainInterfaces(aValue);
|
1280 |
if HasInterface(1) then
|
1281 |
TMetaData(GetInterface(1)).RetainInterfaces := aValue;
|
1282 |
if HasInterface(0) then
|
1283 |
TSQLParams(GetInterface(0)).RetainInterfaces := aValue;
|
1284 |
end;
|
1285 |
|
1286 |
function TFB25Statement.IsPrepared: boolean;
|
1287 |
begin
|
1288 |
Result := FHandle <> nil;
|
1289 |
end;
|
1290 |
|
1291 |
end.
|
1292 |
|