读取Firebird存储过程的返回值

时间:2012-12-19 09:54:28

标签: c++ stored-procedures firebird c++builder

我有这个Firebird存储过程:

SET TERM ^ ;
CREATE PROCEDURE MYSP ( FIRSTPARAM Varchar(3) )
    RETURNS ( ERROR Varchar(128) )
AS BEGIN
    /* a lot of things, including setting a value to ERROR */
    suspend;
END^
SET TERM ; ^

我需要在C ++ Builder XE2中执行此过程,最后读取它的返回值(ERROR)以查看它是否成功。过程只返回一行。

我试过这种方式:

TIBQuery* q = DMH->ordQuery;
q->Close( );
q->SQL->Clear( );
q->SQL->Text = "EXECUTE PROCEDURE MYSP(:P1)";

if ( !DMH->ordTrans->InTransaction )
{
    MakeCommit = true;
    DMH->ordTrans->StartTransaction( );
}
if ( !q->Prepared )
    q->Prepare( );

q->Params->ParamByName( "P1" )->Value = "abc";
q->Open();

//success if error field contains NULL
TField* errorField = q->FieldByName( "ERROR" );
bool success = errorField->IsNull;

if ( MakeCommit )
    DMH->ordTrans->Commit( );

它在errorField上给了我访问权限,因为它找不到这样的字段。

1 个答案:

答案 0 :(得分:0)

我不得不改变声明:

SELECT ERROR
FROM MYSP(:P1)