[英]In MySQL: How to pass a table name as stored procedure and/or function argument?
[英]How to pass table name as argument in a stored procedure in mysql?
我正在尝试在存储过程中实现以下查询。
SELECT d.empno, d.fecthIdId, c.empno
FROM MyDatabase.myTable a
JOIN MyDatabase.myTable b ON a.id = b.xid
JOIN MyDatabase.Table2 c ON b.Id = cId
JOIN MyDatabase.Table3 d ON a.bid = d.cid AND d.empId = _empId
存储过程:
DELIMITER $$
CREATE PROCEDURE `TestSP`(_empId INT, _myTable VARCHAR(50))
BEGIN
SET @mysql.SQL
= CONCAT('SELECT d.empno, d.fecthIdId, c.empno
FROM MyDatabase.',_myTable,' a
JOIN MyDatabase.',_myTable,' b ON a.id = b.xid
JOIN MyDatabase.Table2 c ON b.Id = cId
JOIN MyDatabase.Table3 d ON a.bid = d.cid AND d.empId = _empId');
PREPARE dynamicQuery FROM @mysql.SQL;
EXECUTE dynamicQuery;
DEALLOCATE PREPARE dynamicQuery;
END$$
DELIMITER ;
程序调用:
call TestSP(10, 'myTable');
错误:
Error Code: 1113. A table must have at least 1 column
我不确定代码有什么问题。 谢谢你的帮助。
你会调试你的代码。
CREATE PROCEDURE `TestSP`(_empId INT, _myTable VARCHAR(50))
BEGIN
SET @mysql.SQL
= CONCAT('SELECT d.empno, d.fecthIdId, c.empno
FROM MyDatabase.',_myTable,' a
JOIN MyDatabase.',_myTable,' b ON a.id = b.xid
JOIN MyDatabase.Table2 c ON b.Id = cId
JOIN MyDatabase.Table3 d ON a.bid = d.cid AND d.empId = _empId');
/*
PREPARE dynamicQuery FROM @mysql.SQL;
EXECUTE dynamicQuery;
DEALLOCATE PREPARE dynamicQuery;
*/
SELECT @mysql.SQL `built SQL code`;
END
call TestSP(10, 'myTable');
内置 SQL 代码 |
---|
SELECT d.empno, d.fecthIdId, c.empno 来自 MyDatabase.myTable 在 a.id = b.xid 上加入 MyDatabase.myTable b 在 b.Id = cId 上加入 MyDatabase.Table2 c 在 a.bid = d.cid 和 d.empId = _empId 上加入 MyDatabase.Table3 d |
现在将此代码复制粘贴到您的 CLI 中并尝试执行它。
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