MEMBER OF

描述

如果被检索的元素和 JSON 数组中的任意一个元素相同，则该函数返回 1，否则返回 0。

语法

value MEMBER OF(json_array)

说明

如果 value 是 json_array 的元素，则返回 1，否则返回 0。

value 必须是标量或 JSON 文档；如果它是标量，则运算符会将其视为 JSON 数组的元素。

示例

SELECT 45 MEMBER OF('[123, "abc", 45, "ab", 10]');
+--------------------------------------------+
| 45 MEMBER OF('[123, "abc", 45, "ab", 10]') |
+--------------------------------------------+
|                                          1 |
+--------------------------------------------+
1 row in set (0.001 sec)

SELECT 'cd' MEMBER OF('[23, "abc", 17, "cd", 10]');
+---------------------------------------------+
| 'cd' MEMBER OF('[23, "abc", 17, "cd", 10]') |
+---------------------------------------------+
|                                           1 |
+---------------------------------------------+
1 row in set (0.001 sec)

SELECT 5 MEMBER OF('[123, "abc", 45, "ab", 10]');
+-------------------------------------------+
| 5 MEMBER OF('[123, "abc", 45, "ab", 10]') |
+-------------------------------------------+
|                                         0 |
+-------------------------------------------+
1 row in set (0.001 sec)

SELECT
       45 MEMBER OF('[23, "abc", "45", "ab", 10]'),
      "45" MEMBER OF('[23, "abc", 45, "ab", 10]')\G
*************************** 1. row ***************************
45 MEMBER OF('[23, "abc", "45", "ab", 10]'): 0
"45" MEMBER OF('[23, "abc", 45, "ab", 10]'): 0
1 row in set (0.001 sec)

SELECT CAST('[4,5]' AS JSON) MEMBER OF('[[3,2],[4,5]]');
+--------------------------------------------------+
| CAST('[4,5]' AS JSON) MEMBER OF('[[3,2],[4,5]]') |
+--------------------------------------------------+
|                                                1 |
+--------------------------------------------------+
1 row in set (0.001 sec)

SELECT JSON_ARRAY(4,5) MEMBER OF('[[3,2],[4,5]]');
+--------------------------------------------+
| JSON_ARRAY(4,5) MEMBER OF('[[3,2],[4,5]]') |
+--------------------------------------------+
|                                          1 |
+--------------------------------------------+
1 row in set (0.001 sec)