mysql 查询json

------------------------ 数组 ------------------------

> 数组提取

-- ------------------------------ 提取 JSON_EXTRACT ------------------------------
-- 定义数组
SET @mapJSON = '[{"id":"10000004555096","name":"1.docx","format":"docx","type":0},{"id":"10000004555098","name":"2.doc","format":"doc","type":0},{"id":"10000004555097","name":"3.html","format":"html","type":1}]';

-- 提取数组下标为 0 的元素
SELECT JSON_EXTRACT(@mapJSON, "$[0]") AS result;
-- {"id": "10000004555096", "name": "1.docx", "type": 0, "format": "docx"}

-- 提取数组每个元素的字段 name
SELECT JSON_EXTRACT(@mapJSON, "$[*].name") AS result;
-- ["1.docx", "2.doc", "3.html"]

-- 提取数组下标为 1 的元素的字段 name
SELECT JSON_EXTRACT(@mapJSON, "$[1].name") AS result;
-- "2.doc"

-- 提取数组下标为 2 的元素的字段 type
SELECT JSON_EXTRACT(@mapJSON, "$[2].type") AS result;
-- 1

> 数组查找

-- ------------------------------ 查找 JSON_CONTAINS ------------------------------
-- 定义数组
SET @mapJSON = '[{"id":"10000004555096","name":"1.docx","format":"docx","type":0},{"id":"10000004555098","name":"2.doc","format":"doc","type":0},{"id":"10000004555097","name":"3.html","format":"html","type":1}]';

-- 示例1：查找 id 等于 10000004555096 的元素
SELECT JSON_CONTAINS(JSON_EXTRACT(@mapJSON, "$[*]"), JSON_OBJECT('id', '10000004555096')) AS result;
-- 1

-- 示例1：查找 name 等于 3.htm1 的元素
SELECT JSON_CONTAINS(JSON_EXTRACT(@mapJSON, "$[*].name"), '"3.html"') AS result;
-- 1
SELECT JSON_CONTAINS(JSON_EXTRACT(@mapJSON, "$[*].name"), '"3.HTML"') AS result;
-- 0