ORA-24338:未执行语句句柄

Question

我正在使用Delphi 7,Oracle 10和ODAC组件.

从LoadTrainResult方法我调用storedProc.

    procedure TfrmTrain.LoadTrainResult;  
    begin  
        StoredProc.StoredProcName :=  'PTRAIN.QTRAIN';    
        StoredProc.Prepare;  
    try        
        StoredProc.ParamByName('P_COURSE').AsString  := CurrentSearch.Course;  
        StoredProc.ParamByName('P_TOPIC').AsString   := CurrentSearch.Topic;  
        StoredProc.ParamByName('P_EMP').AsString     := CurrentSearch.Emp;  
        StoredProc.Open;  
    finally  
        StoredProc.Close;  
    end;  
    end; 

架构是

    Create or replace PACKAGE TRAIN.pTRAIN  IS 
    TYPE CursorType IS REF CURSOR;   
    PROCEDURE QTRAIN   (p_CursorVar OUT CursorType, p_Course in VarChar2, 
                            p_Topic  in out VarChar2, p_emp in Varchar 2 );  
    END TRAIN.pTRAIN;

    create or replace PACKAGE BODY  TRAIN.pTRAIN  IS  
    PROCEDURE QTRAIN   (p_CursorVar OUT CursorType, p_Course in VarChar2, 
                            p_Topic in out  VarChar2, p_emp in Varchar 2 ) 

    IS    
    BEGIN   
            if p_course is not null then  
            OPEN p_cursorvar for    
                    select * from train.course 
                    where course = p_Course;  
            elsif p_topic is not null then  
            OPEN p_cursorvar for  
                    select * 
                    from train.topic
                    where topic = p_topic;
    end if;         
    Exception
            WHEN OTHERS THEN
            p_TOPIC := '';  
    END QTRAIN;  
    END TRAIN.pTRAIN;

当我正在编译包时,我没有得到任何错误.我怎么运行应用程序我得到一个错误ORA-24338:语句句柄没有执行.我调试了我的应用程序,我发现错误发生在StoredProc.Prepare; 不是在StoredProc.ExecProc;

我读了很多关于ORA-24338的帖子,我无法找出我的代码有什么问题.

我发现当我在存储过程中添加一个else条件时我没有得到错误.

修改后的Proc是

    create or replace PACKAGE BODY  TRAIN.pTRAIN  IS  
    PROCEDURE QTRAIN   (p_CursorVar OUT CursorType, p_Course in VarChar2,
                             p_Topic in out  VarChar2, p_emp in Varchar 2 )  
    IS    
    BEGIN   
            if p_course is not null then  
            OPEN p_cursorvar for    
            select *    from train.course 
       where course = p_Course; 

            elsif p_topic is not null then
            OPEN p_cursorvar for
            select * from train.topic
       where topic = p_topic  

            else   
            OPEN p_cursorvar for  
            select * from emp whhere empid = p_emp; 

            end if;
            Exception
            WHEN OTHERS THEN
            p_TOPIC := '';  
            END QTRAIN;  
    END TRAIN.pTRAIN;

其实我不想要其他条件.有没有办法摆脱错误.

Answer 1

在我看来,问题是:在存储过程的第一个版本中,可能没有返回结果集,但在第二个版本中,您在最后一个中提供了结果集.

当我们通过查看完整的错误报告了解ORA-24338的含义时,我的怀疑甚至更强烈:

Error: ORA-24338
Text: statement handle not executed 
---------------------------------------------------------------------------
Cause: A fetch was attempted before executing a statement handle. 
Action: Execute a statement and then fetch the data.

尝试获取,但在某些情况下,没有任何结果集被提取,直到你提供了最后一个.

存储过程通过输出参数返回游标,因此您始终必须打开该游标.在代码的第一个版本中,您没有.