如何将Oracle引用游标提取到表变量中？

Question

我试图将参考光标中的数据加载到表变量(或数组)中,如果表变量基于现有的%Rowtype但参考光标通过连接多个表来加载,则参考光标可以工作,所以让我试着演示一个例子我想做什么,有些人可以帮助我

--created table
create table SAM_TEMP(
    col1 number null,
    col2 varchar(100) null
);

--created procedure which outputs results from that table

CREATE OR REPLACE
PROCEDURE SP_OUT_RefCur_PARAM(
    C_RESULT OUT SYS_REFCURSOR
) IS
BEGIN
    OPEN C_RESULT FOR 
        SELECT COL1,COL2
        FROM SAM_TEMP;
END SP_OUT_RefCur_PARAM;

--seeing the output works like this
DECLARE 
    REFCUR SYS_REFCURSOR;   
    outtable SAM_TEMP%rowtype ;  
BEGIN 
    SP_OUT_RefCur_PARAM(REFCUR);
    LOOP
        FETCH REFCUR INTO outtable;
        EXIT WHEN REFCUR%NOTFOUND;
        dbms_output.put_line(outtable.col1);
    END LOOP;
    CLOSE REFCUR;
END;


--but when i try to run below script it is giving error,i think i am missing something
DECLARE 
    REFCUR SYS_REFCURSOR;   
    TYPE REFTABLETYPE IS RECORD (COL1 NUMBER, COL2  VARCHAR(100));
    TYPE TABLETYPE IS TABLE OF REFTABLETYPE;
    outtable TABLETYPE; 
BEGIN 
    SP_OUT_RefCur_PARAM(REFCUR);
    LOOP
        FETCH REFCUR INTO outtable;
        EXIT WHEN REFCUR%NOTFOUND;
        dbms_output.put_line(outtable.col1);
    END LOOP;
    CLOSE REFCUR;
END;

错误报告:

ORA-06550 line 9, column 21:
PLS-00597 expression 'OUTTABLE' in the INTO list is of wrong type
ORA-06550 line 9, column 3:
PL/SQL SQL Statement ignored
ORA-06550 line 11, column 32:
PLS-00302 component 'COL1' must be declared

不确定我错过了什么,在此先感谢您的帮助

Answer 1

上面代码中的变量名称误导了你.您的变量outtable是table类型.无法将记录数据提取到记录表中,但您可以将其提取到记录本身.

DECLARE 
    REFCUR SYS_REFCURSOR;   
    TYPE RECORDTYPE IS RECORD (COL1 NUMBER, COL2  VARCHAR(100));
    outtable RECORDTYPE; 
BEGIN 
    SP_OUT_RefCur_PARAM(REFCUR);
    LOOP
        FETCH REFCUR INTO outtable;
        EXIT WHEN REFCUR%NOTFOUND;
        dbms_output.put_line(outtable.col1);
    END LOOP;
    CLOSE REFCUR;
END;

更新:如果要获取所有数据以获得更好的性能,您需要使用BULK COLLECT语句:

DECLARE 
    REFCUR SYS_REFCURSOR;   
    TYPE RECORDTYPE IS
        RECORD (COL1 NUMBER, COL2  VARCHAR(100));
    TYPE TABLETYPE IS
        TABLE OF REFTABLETYPE
        INDEX BY PLS_INTEGER;
    outtable TABLETYPE; 
BEGIN 
    SP_OUT_RefCur_PARAM(REFCUR);
    LOOP
        FETCH REFCUR INTO BULK COLLECT outtable;
        EXIT WHEN outtable.COUNT = 0;

        FOR indx IN 1 .. outtable.COUNT 
        LOOP
            dbms_output.put_line(outtable(indx).col1);;
        END LOOP;
    END LOOP;
    CLOSE REFCUR;
END;

注意:使用BULK语句的内存消耗远远超过没有.

当您了解并开始利用BULK COLLECT等功能时,最重要的是要记住,没有免费的午餐.几乎总是需要在某处进行权衡.与许多其他性能增强功能一样,与BULK COLLECT的权衡是"运行速度更快但消耗更多内存".(Oracle杂志)

但是,如果您只是获取和处理行 - 一次一行,BULK语句中没有需要,只需使用光标即可FOR LOOP.(问汤姆)