Question

我从存储的函数中获取了一些变量。我想将它们作为存储过程中的游标返回。（原因是因为我想在Jasper报告中使用它们而Jasper只允许使用游标输出存储过程）

我的PL / SQL代码是：

procedure myprocedure (my_cursor OUT sys_refcursor) is
    output1 TABLE1.FIELD1%TYPE;
    output2 TABLE1.FIELD2%TYPE;
    output3 TABLE2.FIELD1%TYPE;
    output4 TABLE1.FIELD3%TYPE;
    begin
        IF NOT(package1.function1 (output1, output2, output3, output3))
        THEN                
            output1 := NULL;
            output2 := NULL;
            output3 := NULL;
            output4 := NULL;
        END IF;
    open my_cursor for
    select :output1 as myoutput1, :output2 as myoutput2, :output3 as myoutput3, :output4 as myoutput4
    from DUAL
end myprocedure;

我得到PLS-00049: bad bind variable 'output1'

如何在游标中返回函数的结果？

Answer 1

离开冒号（:)，因为@Ramblin'Man评论为我解决了这个问题。

select output1 as myoutput1, output2 as myoutput2, output3 as myoutput3, output4 as myoutput4 from DUAL

SQL中的冒号称为Bind Variable。

正如您在本文中所看到的， PL / SQL本身负责处理绑定变量的大部分问题

同样在PL / SQL示例的末尾：现在您可能认为必须用绑定变量替换p_empno。然而，好消息是对PL / SQL变量的每个引用实际上都是绑定变量。

感谢您的帮助。

Answer 2

CREATE TABLE test_tbl
(
    col1 VARCHAR(5)
,   col2 VARCHAR(5)
,   col3 VARCHAR(5)
);


DECLARE
    l_output1 test_tbl.col1%TYPE;
    l_output2 test_tbl.col2%TYPE;
    l_output3 test_tbl.col3%TYPE;

    l_select VARCHAR2(32767);
    l_cur    SYS_REFCURSOR;
BEGIN
    l_output1 := 'col1';
    l_output2 := 'col2';
  --l_output3

    l_select := 'SELECT '
                    || CASE WHEN l_output1 IS NOT NULL THEN '''' || l_output1 || ''' AS my_' || l_output1 ELSE 'NULL' END || CASE WHEN l_output2 IS NOT NULL THEN  ', ' ELSE NULL END
                    || CASE WHEN l_output2 IS NOT NULL THEN '''' || l_output2 || ''' AS my_' || l_output2 ELSE NULL   END || CASE WHEN l_output3 IS NOT NULL THEN  ', ' ELSE NULL END
                    || CASE WHEN l_output3 IS NOT NULL THEN '''' || l_output3 || ''' AS my_' || l_output3 ELSE NULL   END ||
                ' FROM DUAL';

    DBMS_OUTPUT.PUT_LINE(l_select);

    OPEN l_cur FOR l_select;

    IF l_cur%ISOPEN THEN
        DBMS_OUTPUT.PUT_LINE('l_cur IS OPEN');

        CLOSE l_cur;
    END IF;
END;
/*
Result:

SELECT 'col1' AS my_col1, 'col2' AS my_col2 FROM DUAL
l_cur IS OPEN
*/

PL / SQL - 如何将变量作为游标返回？

2 个答案: