mysql 从数组中提取json元素答案

【问题标题】：mysql Extract json element from arraymysql 从数组中提取json元素
【发布时间】：2018-03-02 06:12:56
【问题描述】：

我需要按索引提取 JSON 元素，例如

SELECT JSON_EXTRACT('[{"featureId":"a","read":1,"write":1,"delete":1},{"featureId":"2","read":1,"write":0,"delete":1}]', '$[0].*');

但它只是提取我想要提取的部分的值是这样的：

{
    "featureId": "a",
    "read": 1,
    "write": 1,
    "delete": 1
}

【问题讨论】：

你可以使用select JSON_OBJECT('[{"featureId":"a","read":1,"write":1,"delete":1},{"featureId":"2","read":1,"write":0,"delete":1}]', '$[0].*');
它不起作用。它返回完整的 json

标签： mysql json

【解决方案1】：

试试：

SELECT JSON_EXTRACT('
  [
    {"featureId":"a","read":1,"write":1,"delete":1},
    {"featureId":"2","read":1,"write":0,"delete":1}
  ]
', '$[0]');

【讨论】：