MySQL处理JSON常见函数的使用

程序员文章站 2022-04-01 08:39:45

官方文档：json functions name description json_append() append data...

name	description
json_append()	append data to json document
json_array()	create json array
json_array_append()	append data to json document
json_array_insert()	insert into json array
	return value from json column after evaluating path; equivalent to json_extract().
json_contains()	whether json document contains specific object at path
json_contains_path()	whether json document contains any data at path
json_depth()	maximum depth of json document
json_extract()	return data from json document
	return value from json column after evaluating path and unquoting the result; equivalent to json_unquote(json_extract()).
json_insert()	insert data into json document
json_keys()	array of keys from json document
json_length()	number of elements in json document
json_merge()	merge json documents
json_object()	create json object
json_quote()	quote json document
json_remove()	remove data from json document
json_replace()	replace values in json document
json_search()	path to value within json document
json_set()	insert data into json document
json_type()	type of json value
json_unquote()	unquote json value
json_valid()	whether json value is valid

1. 概述

mysql里的json分为json array和json object。 $表示整个json对象，在索引数据时用下标(对于json array，从0开始)或键值(对于json object，含有特殊字符的key要用"括起来，比如$."my name")。

例如：[3, {"a": [5, 6], "b": 10}, [99, 100]]，那么：

$[0]：3

$[1]： {"a": [5, 6], "b": 10}

$[2] ：[99, 100]

$[3] ： null

$[1].a：[5, 6]

$[1].a[1]：6

$[1].b：10

$[2][0]：99

2. 比较规则

json中的数据可以用 =, <, <=, >, >=, <>, !=, and <=> 进行比较。但json里的数据类型可以是多样的，那么在不同类型之间进行比较时，就有优先级了，高优先级的要大于低优先级的（可以用json_type()函数查看类型）。优先级从高到低如下：

blob
bit
opaque
datetime
time
date
boolean
array
object
string
integer, double
null　

3. 常用函数

3.1 创建函数

3.1.1 json_array

json_array(val1,val2,val3...)

生成一个包含指定元素的json数组。

mysql> select json_array(1, "abc", null, true, curtime());
+---------------------------------------------+
| json_array(1, "abc", null, true, curtime()) |
+---------------------------------------------+
| [1, "abc", null, true, "11:30:24.000000"]  |
+---------------------------------------------+

3.1.2 json_object

json_object(key1,val1,key2,val2...)

生成一个包含指定k-v对的json object。如果有key为null或参数个数为奇数，则抛错。

mysql> select json_object('id', 87, 'name', 'carrot');
+-----------------------------------------+
| json_object('id', 87, 'name', 'carrot') |
+-----------------------------------------+
| {"id": 87, "name": "carrot"}      |
+-----------------------------------------+

3.1.3 json_quote

json_quote(json_val)

将json_val用"号括起来。

mysql> select json_quote('null'), json_quote('"null"');
+--------------------+----------------------+
| json_quote('null') | json_quote('"null"') |
+--------------------+----------------------+
| "null"       | "\"null\""      |
+--------------------+----------------------+
mysql> select json_quote('[1, 2, 3]');
+-------------------------+
| json_quote('[1, 2, 3]') |
+-------------------------+
| "[1, 2, 3]"       |
+-------------------------+

3.1.4 convert

convert(json_string,json)

mysql> select convert('{"mail": "amy@gmail.com", "name": "amy"}',json);
+----------------------------------------------------------+
| convert('{"mail": "amy@gmail.com", "name": "amy"}',json) |
+----------------------------------------------------------+
| {"mail": "amy@gmail.com", "name": "amy"}         |
+----------------------------------------------------------+

3.2 查询函数　　

3.2.1 json_contains

json_contains(json_doc, val[, path])

查询json文档是否在指定path包含指定的数据，包含则返回1，否则返回0。如果有参数为null或path不存在，则返回null。

mysql> set @j = '{"a": 1, "b": 2, "c": {"d": 4}}';
mysql> set @j2 = '1';
mysql> select json_contains(@j, @j2, '$.a');
+-------------------------------+
| json_contains(@j, @j2, '$.a') |
+-------------------------------+
|               1 |
+-------------------------------+
mysql> select json_contains(@j, @j2, '$.b');
+-------------------------------+
| json_contains(@j, @j2, '$.b') |
+-------------------------------+
|               0 |
+-------------------------------+
 
mysql> set @j2 = '{"d": 4}';
mysql> select json_contains(@j, @j2, '$.a');
+-------------------------------+
| json_contains(@j, @j2, '$.a') |
+-------------------------------+
|               0 |
+-------------------------------+
mysql> select json_contains(@j, @j2, '$.c');
+-------------------------------+
| json_contains(@j, @j2, '$.c') |
+-------------------------------+
|               1 |
+-------------------------------+

3.2.2 json_contains_path

json_contains_path(json_doc, one_or_all, path[, path] ...)

查询是否存在指定路径，存在则返回1，否则返回0。如果有参数为null，则返回null。

one_or_all只能取值"one"或"all"，one表示只要有一个存在即可；all表示所有的都存在才行。

mysql> set @j = '{"a": 1, "b": 2, "c": {"d": 4}}';
mysql> select json_contains_path(@j, 'one', '$.a', '$.e');
+---------------------------------------------+
| json_contains_path(@j, 'one', '$.a', '$.e') |
+---------------------------------------------+
|                      1 |
+---------------------------------------------+
mysql> select json_contains_path(@j, 'all', '$.a', '$.e');
+---------------------------------------------+
| json_contains_path(@j, 'all', '$.a', '$.e') |
+---------------------------------------------+
|                      0 |
+---------------------------------------------+
mysql> select json_contains_path(@j, 'one', '$.c.d');
+----------------------------------------+
| json_contains_path(@j, 'one', '$.c.d') |
+----------------------------------------+
|                   1 |
+----------------------------------------+
mysql> select json_contains_path(@j, 'one', '$.a.d');
+----------------------------------------+
| json_contains_path(@j, 'one', '$.a.d') |
+----------------------------------------+
|                   0 |
+----------------------------------------+

3.2.3 json_extract

json_extract(json_doc, path[, path] ...)

从json文档里抽取数据。如果有参数有null或path不存在，则返回null。如果抽取出多个path，则返回的数据封闭在一个json array里。

mysql> select json_extract('[10, 20, [30, 40]]', '$[1]');
+--------------------------------------------+
| json_extract('[10, 20, [30, 40]]', '$[1]') |
+--------------------------------------------+
| 20                     |
+--------------------------------------------+
mysql> select json_extract('[10, 20, [30, 40]]', '$[1]', '$[0]');
+----------------------------------------------------+
| json_extract('[10, 20, [30, 40]]', '$[1]', '$[0]') |
+----------------------------------------------------+
| [20, 10]                      |
+----------------------------------------------------+
mysql> select json_extract('[10, 20, [30, 40]]', '$[2][*]');
+-----------------------------------------------+
| json_extract('[10, 20, [30, 40]]', '$[2][*]') |
+-----------------------------------------------+
| [30, 40]                   |
+-----------------------------------------------+

在mysql 5.7.9+里可以用"->"替代。

mysql> select c, json_extract(c, "$.id"), g
   > from jemp
   > where json_extract(c, "$.id") > 1
   > order by json_extract(c, "$.name");
+-------------------------------+-----------+------+
| c               | c->"$.id" | g  |
+-------------------------------+-----------+------+
| {"id": "3", "name": "barney"} | "3"    |  3 |
| {"id": "4", "name": "betty"} | "4"    |  4 |
| {"id": "2", "name": "wilma"} | "2"    |  2 |
+-------------------------------+-----------+------+
3 rows in set (0.00 sec)
 
mysql> select c, c->"$.id", g
   > from jemp
   > where c->"$.id" > 1
   > order by c->"$.name";
+-------------------------------+-----------+------+
| c               | c->"$.id" | g  |
+-------------------------------+-----------+------+
| {"id": "3", "name": "barney"} | "3"    |  3 |
| {"id": "4", "name": "betty"} | "4"    |  4 |
| {"id": "2", "name": "wilma"} | "2"    |  2 |
+-------------------------------+-----------+------+
3 rows in set (0.00 sec)

在mysql 5.7.13+，还可以用"->>"表示去掉抽取结果的"号，下面三种效果是一样的：

json_unquote( json_extract(column, path) )
json_unquote(column -> path)
column->>path

mysql> select * from jemp where g > 2;
+-------------------------------+------+
| c               | g  |
+-------------------------------+------+
| {"id": "3", "name": "barney"} |  3 |
| {"id": "4", "name": "betty"} |  4 |
+-------------------------------+------+
2 rows in set (0.01 sec)
 
mysql> select c->'$.name' as name  
  ->   from jemp where g > 2;
+----------+
| name   |
+----------+
| "barney" |
| "betty" |
+----------+
2 rows in set (0.00 sec)
 
mysql> select json_unquote(c->'$.name') as name
  ->   from jemp where g > 2;
+--------+
| name  |
+--------+
| barney |
| betty |
+--------+
2 rows in set (0.00 sec)
 
mysql> select c->>'$.name' as name
  ->   from jemp where g > 2;
+--------+
| name  |
+--------+
| barney |
| betty |
+--------+
2 rows in set (0.00 sec)

3.2.4 json_keys

json_keys(json_doc[, path])

获取json文档在指定路径下的所有键值，返回一个json array。如果有参数为null或path不存在，则返回null。

mysql> select json_keys('{"a": 1, "b": {"c": 30}}');
+---------------------------------------+
| json_keys('{"a": 1, "b": {"c": 30}}') |
+---------------------------------------+
| ["a", "b"]              |
+---------------------------------------+
mysql> select json_keys('{"a": 1, "b": {"c": 30}}', '$.b');
+----------------------------------------------+
| json_keys('{"a": 1, "b": {"c": 30}}', '$.b') |
+----------------------------------------------+
| ["c"]                    |
+----------------------------------------------+

3.2.5 json_search

json_search(json_doc, one_or_all, search_str[, escape_char[, path] ...])

查询包含指定字符串的paths，并作为一个json array返回。如果有参数为nul或path不存在，则返回null。

one_or_all："one"表示查询到一个即返回；"all"表示查询所有。
search_str：要查询的字符串。可以用like里的'%'或‘_'匹配。
path：在指定path下查。

mysql> set @j = '["abc", [{"k": "10"}, "def"], {"x":"abc"}, {"y":"bcd"}]';
 
mysql> select json_search(@j, 'one', 'abc');
+-------------------------------+
| json_search(@j, 'one', 'abc') |
+-------------------------------+
| "$[0]"            |
+-------------------------------+
 
mysql> select json_search(@j, 'all', 'abc');
+-------------------------------+
| json_search(@j, 'all', 'abc') |
+-------------------------------+
| ["$[0]", "$[2].x"]      |
+-------------------------------+
 
mysql> select json_search(@j, 'all', 'ghi');
+-------------------------------+
| json_search(@j, 'all', 'ghi') |
+-------------------------------+
| null             |
+-------------------------------+
 
mysql> select json_search(@j, 'all', '10');
+------------------------------+
| json_search(@j, 'all', '10') |
+------------------------------+
| "$[1][0].k"         |
+------------------------------+
 
mysql> select json_search(@j, 'all', '10', null, '$');
+-----------------------------------------+
| json_search(@j, 'all', '10', null, '$') |
+-----------------------------------------+
| "$[1][0].k"               |
+-----------------------------------------+
 
mysql> select json_search(@j, 'all', '10', null, '$[*]');
+--------------------------------------------+
| json_search(@j, 'all', '10', null, '$[*]') |
+--------------------------------------------+
| "$[1][0].k"                |
+--------------------------------------------+
 
mysql> select json_search(@j, 'all', '10', null, '$**.k');
+---------------------------------------------+
| json_search(@j, 'all', '10', null, '$**.k') |
+---------------------------------------------+
| "$[1][0].k"                 |
+---------------------------------------------+
 
mysql> select json_search(@j, 'all', '10', null, '$[*][0].k');
+-------------------------------------------------+
| json_search(@j, 'all', '10', null, '$[*][0].k') |
+-------------------------------------------------+
| "$[1][0].k"                   |
+-------------------------------------------------+
 
mysql> select json_search(@j, 'all', '10', null, '$[1]');
+--------------------------------------------+
| json_search(@j, 'all', '10', null, '$[1]') |
+--------------------------------------------+
| "$[1][0].k"                |
+--------------------------------------------+
 
mysql> select json_search(@j, 'all', '10', null, '$[1][0]');
+-----------------------------------------------+
| json_search(@j, 'all', '10', null, '$[1][0]') |
+-----------------------------------------------+
| "$[1][0].k"                  |
+-----------------------------------------------+
 
mysql> select json_search(@j, 'all', 'abc', null, '$[2]');
+---------------------------------------------+
| json_search(@j, 'all', 'abc', null, '$[2]') |
+---------------------------------------------+
| "$[2].x"                  |
+---------------------------------------------+
 
mysql> select json_search(@j, 'all', '%a%');
+-------------------------------+
| json_search(@j, 'all', '%a%') |
+-------------------------------+
| ["$[0]", "$[2].x"]      |
+-------------------------------+
 
mysql> select json_search(@j, 'all', '%b%');
+-------------------------------+
| json_search(@j, 'all', '%b%') |
+-------------------------------+
| ["$[0]", "$[2].x", "$[3].y"] |
+-------------------------------+
 
mysql> select json_search(@j, 'all', '%b%', null, '$[0]');
+---------------------------------------------+
| json_search(@j, 'all', '%b%', null, '$[0]') |
+---------------------------------------------+
| "$[0]"                   |
+---------------------------------------------+
 
mysql> select json_search(@j, 'all', '%b%', null, '$[2]');
+---------------------------------------------+
| json_search(@j, 'all', '%b%', null, '$[2]') |
+---------------------------------------------+
| "$[2].x"                  |
+---------------------------------------------+
 
mysql> select json_search(@j, 'all', '%b%', null, '$[1]');
+---------------------------------------------+
| json_search(@j, 'all', '%b%', null, '$[1]') |
+---------------------------------------------+
| null                    |
+---------------------------------------------+
 
mysql> select json_search(@j, 'all', '%b%', '', '$[1]');
+-------------------------------------------+
| json_search(@j, 'all', '%b%', '', '$[1]') |
+-------------------------------------------+
| null                   |
+-------------------------------------------+
 
mysql> select json_search(@j, 'all', '%b%', '', '$[3]');
+-------------------------------------------+
| json_search(@j, 'all', '%b%', '', '$[3]') |
+-------------------------------------------+
| "$[3].y"                 |
+-------------------------------------------+

3.3 修改函数

3.3.1 json_append/json_array_append

json_array_append(json_doc, path, val[, path, val] ...)

在指定path的json array尾部追加val。如果指定path是一个json object，则将其封装成一个json array再追加。如果有参数为null，则返回null。

mysql> set @j = '["a", ["b", "c"], "d"]';
mysql> select json_array_append(@j, '$[1]', 1);
+----------------------------------+
| json_array_append(@j, '$[1]', 1) |
+----------------------------------+
| ["a", ["b", "c", 1], "d"]    |
+----------------------------------+
mysql> select json_array_append(@j, '$[0]', 2);
+----------------------------------+
| json_array_append(@j, '$[0]', 2) |
+----------------------------------+
| [["a", 2], ["b", "c"], "d"]   |
+----------------------------------+
mysql> select json_array_append(@j, '$[1][0]', 3);
+-------------------------------------+
| json_array_append(@j, '$[1][0]', 3) |
+-------------------------------------+
| ["a", [["b", 3], "c"], "d"]     |
+-------------------------------------+
 
mysql> set @j = '{"a": 1, "b": [2, 3], "c": 4}';
mysql> select json_array_append(@j, '$.b', 'x');
+------------------------------------+
| json_array_append(@j, '$.b', 'x') |
+------------------------------------+
| {"a": 1, "b": [2, 3, "x"], "c": 4} |
+------------------------------------+
mysql> select json_array_append(@j, '$.c', 'y');
+--------------------------------------+
| json_array_append(@j, '$.c', 'y')  |
+--------------------------------------+
| {"a": 1, "b": [2, 3], "c": [4, "y"]} |
+--------------------------------------+
 
mysql> set @j = '{"a": 1}';
mysql> select json_array_append(@j, '$', 'z');
+---------------------------------+
| json_array_append(@j, '$', 'z') |
+---------------------------------+
| [{"a": 1}, "z"]         |
+---------------------------------+

3.3.2 json_array_insert

json_array_insert(json_doc, path, val[, path, val] ...)

在path指定的json array元素插入val，原位置及以右的元素顺次右移。如果path指定的数据非json array元素，则略过此val；如果指定的元素下标超过json array的长度，则插入尾部。

mysql> set @j = '["a", {"b": [1, 2]}, [3, 4]]';
mysql> select json_array_insert(@j, '$[1]', 'x');
+------------------------------------+
| json_array_insert(@j, '$[1]', 'x') |
+------------------------------------+
| ["a", "x", {"b": [1, 2]}, [3, 4]] |
+------------------------------------+
mysql> select json_array_insert(@j, '$[100]', 'x');
+--------------------------------------+
| json_array_insert(@j, '$[100]', 'x') |
+--------------------------------------+
| ["a", {"b": [1, 2]}, [3, 4], "x"]  |
+--------------------------------------+
mysql> select json_array_insert(@j, '$[1].b[0]', 'x');
+-----------------------------------------+
| json_array_insert(@j, '$[1].b[0]', 'x') |
+-----------------------------------------+
| ["a", {"b": ["x", 1, 2]}, [3, 4]]    |
+-----------------------------------------+
mysql> select json_array_insert(@j, '$[2][1]', 'y');
+---------------------------------------+
| json_array_insert(@j, '$[2][1]', 'y') |
+---------------------------------------+
| ["a", {"b": [1, 2]}, [3, "y", 4]]   |
+---------------------------------------+
mysql> select json_array_insert(@j, '$[0]', 'x', '$[2][1]', 'y');
+----------------------------------------------------+
| json_array_insert(@j, '$[0]', 'x', '$[2][1]', 'y') |
+----------------------------------------------------+
| ["x", "a", {"b": [1, 2]}, [3, 4]]         |
+----------------------------------------------------+

3.3.3 json_insert/json_replace/json_set

json_insert(json_doc, path, val[, path, val] ...)

在指定path下插入数据，如果path已存在，则忽略此val（不存在才插入）。

mysql> set @j = '{ "a": 1, "b": [2, 3]}';
mysql> select json_insert(@j, '$.a', 10, '$.c', '[true, false]');
+----------------------------------------------------+
| json_insert(@j, '$.a', 10, '$.c', '[true, false]') |
+----------------------------------------------------+
| {"a": 1, "b": [2, 3], "c": "[true, false]"}    |
+----------------------------------------------------+

json_replace(json_doc, path, val[, path, val] ...)

替换指定路径的数据，如果某个路径不存在则略过（存在才替换）。如果有参数为null，则返回null。

mysql> set @j = '{ "a": 1, "b": [2, 3]}';
mysql> select json_replace(@j, '$.a', 10, '$.c', '[true, false]');
+-----------------------------------------------------+
| json_replace(@j, '$.a', 10, '$.c', '[true, false]') |
+-----------------------------------------------------+
| {"a": 10, "b": [2, 3]}               |
+-----------------------------------------------------+

json_set(json_doc, path, val[, path, val] ...)

设置指定路径的数据（不管是否存在）。如果有参数为null，则返回null。

mysql> set @j = '{ "a": 1, "b": [2, 3]}';
mysql> select json_set(@j, '$.a', 10, '$.c', '[true, false]');
+-------------------------------------------------+
| json_set(@j, '$.a', 10, '$.c', '[true, false]') |
+-------------------------------------------------+
| {"a": 10, "b": [2, 3], "c": "[true, false]"}  |
+-------------------------------------------------+
mysql> select json_insert(@j, '$.a', 10, '$.c', '[true, false]');
+----------------------------------------------------+
| json_insert(@j, '$.a', 10, '$.c', '[true, false]') |
+----------------------------------------------------+
| {"a": 1, "b": [2, 3], "c": "[true, false]"}    |
+----------------------------------------------------+
mysql> select json_replace(@j, '$.a', 10, '$.c', '[true, false]');
+-----------------------------------------------------+
| json_replace(@j, '$.a', 10, '$.c', '[true, false]') |
+-----------------------------------------------------+
| {"a": 10, "b": [2, 3]}               |
+-----------------------------------------------------+

3.3.4 json_merge

json_merge(json_doc, json_doc[, json_doc] ...)

merge多个json文档。规则如下：

如果都是json array，则结果自动merge为一个json array；
如果都是json object，则结果自动merge为一个json object；
如果有多种类型，则将非json array的元素封装成json array再按照规则一进行mege。

mysql> select json_merge('[1, 2]', '[true, false]');
+---------------------------------------+
| json_merge('[1, 2]', '[true, false]') |
+---------------------------------------+
| [1, 2, true, false]          |
+---------------------------------------+
mysql> select json_merge('{"name": "x"}', '{"id": 47}');
+-------------------------------------------+
| json_merge('{"name": "x"}', '{"id": 47}') |
+-------------------------------------------+
| {"id": 47, "name": "x"}          |
+-------------------------------------------+
mysql> select json_merge('1', 'true');
+-------------------------+
| json_merge('1', 'true') |
+-------------------------+
| [1, true]        |
+-------------------------+
mysql> select json_merge('[1, 2]', '{"id": 47}');
+------------------------------------+
| json_merge('[1, 2]', '{"id": 47}') |
+------------------------------------+
| [1, 2, {"id": 47}]         |
+------------------------------------+

3.3.5 json_remove

json_remove(json_doc, path[, path] ...)

移除指定路径的数据，如果某个路径不存在则略过此路径。如果有参数为null，则返回null。

mysql> set @j = '["a", ["b", "c"], "d"]';
mysql> select json_remove(@j, '$[1]');
+-------------------------+
| json_remove(@j, '$[1]') |
+-------------------------+
| ["a", "d"]       |
+-------------------------+

3.3.6 json_unquote

json_unquote(val)

去掉val的引号。如果val为null，则返回null。

mysql> set @j = '"abc"';
mysql> select @j, json_unquote(@j);
+-------+------------------+
| @j  | json_unquote(@j) |
+-------+------------------+
| "abc" | abc       |
+-------+------------------+
mysql> set @j = '[1, 2, 3]';
mysql> select @j, json_unquote(@j);
+-----------+------------------+
| @j    | json_unquote(@j) |
+-----------+------------------+
| [1, 2, 3] | [1, 2, 3]    |
+-----------+------------------+

3.4 json特性查询

3.4.1 json_deepth

json_depth(json_doc)

获取json文档的深度。如果参数为null，则返回null。

空的json array、json object或标量的深度为1。

mysql> select json_depth('{}'), json_depth('[]'), json_depth('true');
+------------------+------------------+--------------------+
| json_depth('{}') | json_depth('[]') | json_depth('true') |
+------------------+------------------+--------------------+
|        1 |        1 |         1 |
+------------------+------------------+--------------------+
mysql> select json_depth('[10, 20]'), json_depth('[[], {}]');
+------------------------+------------------------+
| json_depth('[10, 20]') | json_depth('[[], {}]') |
+------------------------+------------------------+
|           2 |           2 |
+------------------------+------------------------+
mysql> select json_depth('[10, {"a": 20}]');
+-------------------------------+
| json_depth('[10, {"a": 20}]') |
+-------------------------------+
|               3 |
+-------------------------------+

3.4.2 json_length

json_length(json_doc[, path])

获取指定路径下的长度。如果参数为null，则返回null。　

长度的计算规则：

标量的长度为1；
json array的长度为元素的个数；
json object的长度为key的个数。

mysql> select json_length('[1, 2, {"a": 3}]');
+---------------------------------+
| json_length('[1, 2, {"a": 3}]') |
+---------------------------------+
|                3 |
+---------------------------------+
mysql> select json_length('{"a": 1, "b": {"c": 30}}');
+-----------------------------------------+
| json_length('{"a": 1, "b": {"c": 30}}') |
+-----------------------------------------+
|                    2 |
+-----------------------------------------+
mysql> select json_length('{"a": 1, "b": {"c": 30}}', '$.b');
+------------------------------------------------+
| json_length('{"a": 1, "b": {"c": 30}}', '$.b') |
+------------------------------------------------+
|                       1 |
+------------------------------------------------+

3.4.3 json_type

json_type(json_val)

获取json文档的具体类型。如果参数为null，则返回null。

3.4.4 json_valid

json_valid(val)

判断val是否为有效的json格式，是为1，不是为0。如果参数为nul，则返回null。

mysql> select json_valid('{"a": 1}');
+------------------------+
| json_valid('{"a": 1}') |
+------------------------+
|           1 |
+------------------------+
mysql> select json_valid('hello'), json_valid('"hello"');
+---------------------+-----------------------+
| json_valid('hello') | json_valid('"hello"') |
+---------------------+-----------------------+
|          0 |           1 |
+---------------------+-----------------------+

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MySQL处理JSON常见函数的使用

1. 概述

2. 比较规则

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3.3 修改函数

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