Question

在运行Select查询时，返回Pl Pgsql中的所有列用函数编写在传递参数错误时显示。

CREATE OR REPLACE FUNCTION myfunc(ENROLL VARCHAR(50)) RETURNS  SETOF RECORD AS $$
DECLARE CALTYPE VARCHAR(50);
BEGIN
SELECT COMPLETED INTO 
CALTYPE FROM TEMPDATA WHERE
ROLL=ENROLL;
    IF CALTYPE='FALSE' THEN
        RETURN QUERY
        SELECT * FROM SEM8
        WHERE ROLL=ENROLL;
    ELSE
        RETURN QUERY
        SELECT * FROM TEMPDATA
        WHERE ROLL=ENROLL;
    END IF;
END;
$$ LANGUAGE plpgsql;

SELECT * FROM myfunc('123');

Answer 1

返回SETOF RECORD的函数需要列定义。您可以在运行时定义它，如下所示：

SELECT * FROM myfunc('123') mf(columnA TEXT, columnB INTEGER);

或者您可以将函数的返回类型更改为TABLE并在其中定义它，如下所示：

CREATE OR REPLACE FUNCTION myfunc(ENROLL VARCHAR(50)) 
RETURNS  TABLE (
    columnA TEXT,
    columnB INTEGER
) AS $$
DECLARE CALTYPE VARCHAR(50);
BEGIN
SELECT COMPLETED INTO 
CALTYPE FROM TEMPDATA WHERE
ROLL=ENROLL;
    IF CALTYPE='FALSE' THEN
        RETURN QUERY
        SELECT * FROM SEM8
        WHERE ROLL=ENROLL;
    ELSE
        RETURN QUERY
        SELECT * FROM TEMPDATA
        WHERE ROLL=ENROLL;
    END IF;
END;
$$ LANGUAGE plpgsql;

如何在pl pgsql中返回选择查询

1 个答案: