将所有行中的第一个字母大写 MySQL

Question

我需要运行一个脚本来更新“given_name”列并将所有首字母更改为大写..

我目前有这个代码..没有任何反应..

DROP PROCEDURE IF EXISTS CAPITALIZE;
DELIMITER $$

CREATE PROCEDURE CAPITALIZE()
BEGIN
DECLARE n INT DEFAULT 0;
DECLARE i INT DEFAULT 1;
SELECT COUNT(*) INTO n FROM users;
-- SET n = (SELECT COUNT(*) FROM users);
SET i=0;
WHILE (i<=n) DO 
  UPDATE users SET given_name = CONCAT( UPPER(SUBSTR(given_name,1,1)), SUBSTR(given_name,2)) WHERE user_id = n;
  UPDATE users SET last_name = CONCAT( UPPER(SUBSTR(last_name,1,1)), SUBSTR(last_name,2)) WHERE user_id = n;

  SET i = (i + 1);
END WHILE;
END $$
DELIMITER ;

Answer 1

正如@Drew 提到的，您最好只为整个users 表做一个毯子UPDATE 语句：

UPDATE users
SET given_name = CONCAT( UPPER(SUBSTR(given_name,1,1)), LOWER(SUBSTR(given_name,2))),
    last_name = CONCAT( UPPER(SUBSTR(last_name,1,1)), LOWER(SUBSTR(last_name,2)))

要关闭阻止上述查询工作的安全更新模式，请输入：

SET SQL_SAFE_UPDATES = 0;

这是一个演示上述查询的工作小提琴：

SQLFiddle