mysql 5 7 5 6 以下解析json字串

因專案需要編寫包含解析json字串語句的mysql函式，只能將5.6公升級到了5.7，本以為就此完事，但誰知後來業務需要用到中文字串key型別的json，這下5.7就歇菜了，因為原生函式不支援中文字串作為key的解析，網上找了很多網友自定**析json的函式，發現支援度都有不少問題，於是自己寫了個最土的實現（如下），有需要的朋友拿去用吧

delimiter $$

drop function if exists `json_extract_c`$$
create function `json_extract_c`(
details text,
required_field varchar (255)
) returns text charset utf8
begin
declare scount int(3) default 0;
set scount = length(details)-length(replace(details,'
set scount = length(details)-length(replace(details,'}',''));
set details = substring_index(details, "}", scount); -- "a":"a","b":"b","c":"c"
set required_field = concat('"',substring_index(required_field,'$.', -1),'":');
set details = trim(substring_index(details, required_field, -1)); -- "b","c":"c"
if locate('
return details;
elseif locate('"', details) <> 1 then -- b,"c":"c"或b
if locate(',', details) > 1 then
set details = substring_index(details, ',', 1);
end if;
return trim(details);
end if;
set scount = length(details)-length(replace(details,'"',''));
set details = substring_index(details, '"', 0 - scount); -- :"b","c":"c"}
set details = substring_index(details, '"', 1); -- b
return details;
end$$
delimiter ;

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