MySQL 8.0 可以操作 JSON 了

//使用JSON_ARRAY方法定义JSON数组；
SELECT JSON_ARRAY(1, "abc", NULL, TRUE, CURTIME())
//结果：[1, "abc", null, true, "11:30:24.000000"]  

//JSON_OBJECT 方法定义JSON对象
SELECT JSON_OBJECT('id', 87, 'name', 'carrot')
//结果{"id": 87, "name": "carrot"}

//数组 与 对象嵌套的场景；
[99, {"id": "HK500", "cost": 75.99}, ["hot", "cold"]] {"k1": "value", "k2": [10, 20]}

//日期/时间类型定义
["12:18:29.000000", "2015-07-29", "2015-07-29 12:18:29.000000"]

 //JSON_QUOTE 将JSON对象转义成String, 就是将内部的符  号进行转义，并整体包裹上双引号；
JSON_QUOTE(' "null" ')
//结果 "\"null\""

//将JSON内容美化并输出；
JSON_PRETTY()

//可以将JSON/JSON内部的元素转化为其他数据类型;
//如下将JSON jdoc 中的id元素，转化为 unsigned int;
[https://dev.mysql.com/doc/refman/8.0/en/json.html#json-converting-between-types]    (https://dev.mysql.com/doc/refman/8.0/en/json.html#json-converting-between-types)
ORDER BY CAST(JSON_EXTRACT(jdoc, '$.id') AS   UNSIGNED);

// {"mascot": "Our mascot is a dolphin named \"Sakila\"."}
mysql> SELECT col->"$.mascot" FROM qtest;
//结果：| "Our mascot is a dolphin named \"Sakila\"." |
SELECT sentence->>"$.mascot" FROM facts;
// 结果： | Our mascot is a dolphin named "Sakila". |

 [3, {"a": [5, 6], "b": 10}, [99, 100]]
 $[0] = 3 ;
 $[1] = {"a": [5, 6], "b": 10};
 $[2] = [99, 100];

$[1].a = [5,6]
$[1].a[1] = 6
$[1].b = 10;
$[2][0] = 99;

 $[ 1 to 2] = [{"a": [5, 6], "b": 10}, [99, 100]]
 $[last-2 to last-1] = [3, {"a": [5, 6], "b": 10}]

//如上, 应该可以用-->语法取代;
mysql> SELECT JSON_EXTRACT('{"a": 1, "b": 2, "c": [3, 4, 5]}', '$.*');
//[1, 2, [3, 4, 5]]  
SELECT JSON_EXTRACT('{"a": 1, "b": 2, "c": [3, 4, 5]}', '$.c[*]')
//[3, 4, 5]
SELECT JSON_EXTRACT('{"a": {"b": 1}, "c": {"b": 2}}', '$**.b');
//[1, 2]
SELECT JSON_EXTRACT('[1, 2, 3, 4, 5]', '$[1 to 3]');
//[2, 3, 4]

//JSON_SET JSON_INSERT JSON_REPLACE JSON_REMOVE
SET @j = '["a", {"b": [true, false]}, [10, 20]]';
SELECT JSON_SET(@j, '$[1].b[0]', 1, '$[2][2]', 2);
//| ["a", {"b": [1, false]}, [10, 20, 2]]    

SELECT JSON_INSERT(@j, '$[1].b[0]', 1, '$[2][2]', 2);
//["a", {"b": [true, false]}, [10, 20, 2]]

JSON_REPLACE(@j, '$[1].b[0]', 1, '$[2][2]', 2)
//["a", {"b": [1, false]}, [10, 20]]

SELECT JSON_REMOVE(@j, '$[2]', '$[1].b[1]', '$[1].b[1]');
//["a", {"b": [true]}]

SELECT *  FROM JSON_TABLE(   '[{"a":"3"},{"a":2},{"b":1},{"a":0},{"a":[1,2]}]',
  ->     "$[*]"
  ->     COLUMNS(
  ->       rowid FOR ORDINALITY,
  ->       ac VARCHAR(100) PATH "$.a" DEFAULT '111' ON EMPTY DEFAULT '999' ON ERROR,
  ->       aj JSON PATH "$.a" DEFAULT '{"x": 333}' ON EMPTY,
  ->       bx INT EXISTS PATH "$.b"
  ->     )
  ->   ) AS tt;