mysql 解析JSON串

DELIMITER $$  

DROP FUNCTION IF EXISTS fn_parseJson$$  

CREATE FUNCTION fn_parseJson(p_jsonstr VARCHAR(255) character set utf8, p_key VARCHAR(255)) RETURNS VARCHAR(255)

BEGIN  
DECLARE rtnVal VARCHAR(255) DEFAULT '';  

  DECLARE v_key VARCHAR(255);

  SET v_key = CONCAT('"', p_key, '":');

  SET @v_flag = p_jsonstr REGEXP v_key;

IF(@v_flag = 0) THEN 
SET rtnVal = '';
ELSE
SELECT val INTO rtnVal FROM (
SELECT @start_pos := locate(v_key, p_jsonstr), 
@end_pos := @start_pos + length(v_key), 
@tail_pos := if(locate(",", p_jsonstr, @end_pos) = 0, locate("}", p_jsonstr, @end_pos), locate(",", p_jsonstr, @end_pos)), 
substring(p_jsonstr, @end_pos + 1, @tail_pos - @end_pos - 2) as val) as t;   

  END IF;

  RETURN rtnVal;  

END $$  
DELIMITER;

使用样例：

SELECT fn_parseJson('{"name":"Intel Pentium III Xeon 处理器","count":"1","Manufacturer":"GenuineIntel"}', 'count') rtnVal

结果：