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mysql用戶自定義函數實例與部分問題解決方法

   一、查看創建函數的功能是否開啟:

  mysql> show variables like '%func%';

  +-----------------------------------------+-------+

  | Variable_name | Value |

  +-----------------------------------------+-------+

  | log_bin_trust_function_creators | ON |

  +-----------------------------------------+-------+

  1 row in set (0.02 sec)

  二、如果Value處值為OFF,則需將其開啟。

  mysql> set global log_bin_trust_function_creators=1;

  use app02

  delimiter //

  mysql>DROP FUNCTION IF EXISTS `testhanshu`;

  CREATE FUNCTION `testhanshu`(`tustate` int)

  RETURNS varchar(2000)

  BEGIN

  declare oneAddr varchar(200) default '';

  declare allAddr varchar(2000) default '';

  DECLARE done INT DEFAULT FALSE;

  declare curl CURSOR for select utruename from tsys_user where ustate = tustate;

  DECLARE CONTINUE HANDLER FOR NOT FOUND SET done = 1;

  open curl;

  REPEAT

  FETCH curl INTO oneAddr;

  IF NOT done THEN

  set oneAddr = CONCAT(oneAddr, ';');

  set allAddr = CONCAT(allAddr, oneAddr);

  END IF;

  UNTIL done END REPEAT;

  close curl;

  RETURN allAddr;

  END;

  mysql>select testhanshu(1);

  在使用MySql自己定義的函數時,出現錯誤java.sql.SQLException: This function has none of DETERMINISTIC, NO SQL, or READS SQL DATA in its declaration and binary logging is enabled (you *might* want to use the less safe log_bin_trust_function_creators variable)

  解決辦法有三種:

  1. 登錄MySql客戶端,執行: SET GLOBAL log_bin_trust_function_creators = 1;

  2.在登錄MySQL服務器是,在服務啟動時加上 “--log-bin-trust-function-creators=1 ”參數並設置為1。

  3.在my.ini(my.cnf)中的[mysqld]區段中加上 log-bin-trust-function-creators=1。

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