mysql 字符串截取

http://blog.csdn.net/mycms5/article/details/52725877

实例：【可以直接执行，@jsonString是要截取的字段】

　　自定义变量jsonString，

　　substring_index(@jsonString, '"},"', 1),      是截取正数第1个"},"之前的全部字符；

　　substring_index(substring_index(@jsonString, '"},"', 1) , ':"', -1)，   是截取倒数数第1个"},"之后的全部字符；

set @jsonString= '[{"score":{"min":"0","max":"60"},"code":"差"},{"score":{"min":"60","max":"80"},"code":"中"},{"score":{"min":"80","max":"90"},"code":"良"},{"score":{"min":"90","max":"100"},"code":"优"}]';

SELECT

　　@jsonString,

　　substring_index(@jsonString, '"},"', 1),

　　substring_index(substring_index(@jsonString, '"},"', 1) , ':"', -1)