MYSQL处理字符串（x，y）格式（"123.00,456.00

单独对x或者y或者x和y进行处理

代码如下

DROP FUNCTION SPLIT_STR;

CREATE FUNCTION SPLIT_STR(

  x VARCHAR(255),

  delim VARCHAR(12),

  pos INT

)

RETURNS VARCHAR(255)

RETURN REPLACE(SUBSTRING(SUBSTRING_INDEX(x, delim, pos),

      LENGTH(SUBSTRING_INDEX(x, delim, pos -1)) + 1),

      delim, '');

-- 修改x 减少50

update base_map_widget  set points = replace(points,SPLIT_STR(points, ',', 1),SPLIT_STR(points, ',', 1)-50);

-- 修改y 减少50

update base_map_widget  set points = replace(points,SPLIT_STR(points, ',', 2),SPLIT_STR(points, ',', 2)-50);