mysql(5.6及以下)解析json

#json解析函数DELIMITER $$DROP FUNCTION IF EXISTS `json_extract_c`$$CREATE FUNCTION `json_extract_c`(details TEXT,required_field VARCHAR (255)) RETURNS TEXT CHARSET latin1BEGINSET details = SUBSTRING_INDEX(details, "{", -1);SET details = SUBSTRING_INDEX(details, "}", 1);RETURN TRIM(BOTH '"' FROM SUBSTRING_INDEX(SUBSTRING_INDEX(SUBSTRING_INDEX(details,CONCAT('"',SUBSTRING_INDEX(required_field,'$.', -1),'":'),-1),',"',1),':',-1)) ;END$$DELIMITER ;example：select json_extract_c(json, "$.totalDays"), json from item limit 100;

自测

CREATE TABLE `json_test` ( `id` int(11) DEFAULT NULL, `person_desc` text COLLATE utf8mb4_unicode_ci) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;insert INTO json_test values(2,'{"firstName":"Sergei","lastName":"Rachmaninoff","instrument":"piano"}');SELECT id,json_extract_c(person_desc,'$.lastName') as "keys" FROM json_test;

改进，再找不到key，返回''值，之前的是在找不到的情况下，查找到第一的值。

CREATE DEFINER=`zhangfen`@`%` FUNCTION `json_extract_c`(details TEXT,required_field VARCHAR (255)) RETURNS text CHARSET latin1BEGINSET details = SUBSTRING_INDEX(details, "{", -1);SET details = SUBSTRING_INDEX(details, "}", 1);RETURN TRIM(BOTH '"' FROM SUBSTRING_INDEX(SUBSTRING_INDEX(SUBSTRING_INDEX(CONCAT('"":"",',details),CONCAT('"',SUBSTRING_INDEX(required_field,'$.', -1),'":'),-1),',"',1),':',-1)) ;END

总结

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