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mysql中实现相仿oracle的SYS_CONNECT_BY_PATH功能

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2016-06-07 16:25:112600browse

mysql中实现类似oracle的SYS_CONNECT_BY_PATH功能 oracle中的SYS_CONNECT_BY_PATH函数为开发带来了便利,mysql中如何实现类的功能呢? DELIMITER $$ CREATE FUNCTION `getParentList` (rootId VARCHAR (50)) RETURNS VARCHAR (1000) BEGIN DECLARE sParentLis

mysql中实现类似oracle的SYS_CONNECT_BY_PATH功能

   oracle中的SYS_CONNECT_BY_PATH函数为开发带来了便利,mysql中如何实现类似的功能呢?


DELIMITER $$

CREATE FUNCTION `getParentList` (rootId VARCHAR (50)) RETURNS VARCHAR (1000) 
BEGIN
  DECLARE sParentList VARCHAR (1000) ;
  DECLARE sParentTemp VARCHAR(1000); 
  SET sParentTemp =CAST(rootId AS CHAR); 
  WHILE sParentTemp IS NOT NULL DO 
  IF (sParentList IS NOT NULL) THEN 
  SET sParentList = CONCAT(sParentTemp,'/',sParentList); 
  ELSE 
  SET sParentList = CONCAT(sParentTemp); 
  END IF; 
SELECT GROUP_CONCAT(parent_module_id) INTO sParentTemp FROM TOP_SYS_MODULE WHERE FIND_IN_SET(module_id,sParentTemp)>0; 
END WHILE; 
RETURN sParentList; 
END$$
DELIMITER ;



SELECT module_id,parent_module_id,getParentList(module_id) FROM TOP_SYS_MODULE; 
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