---
{
    "title": "get_json_int",
    "language": "zh-CN"
}
---

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# get_json_int
## description
### Syntax

`INT get_json_int(VARCHAR json_str, VARCHAR json_path)`


解析并获取 json 字符串内指定路径的整型内容。
其中 json_path 必须以 $ 符号作为开头，使用 . 作为路径分割符。如果路径中包含 . ，则可以使用双引号包围。
使用 [ ] 表示数组下标，从 0 开始。
path 的内容不能包含 ", [ 和 ]。
如果 json_string 格式不对，或 json_path 格式不对，或无法找到匹配项，则返回 NULL。

## example

1. 获取 key 为 "k1" 的 value

```
mysql> SELECT get_json_int('{"k1":1, "k2":"2"}', "$.k1");
+--------------------------------------------+
| get_json_int('{"k1":1, "k2":"2"}', '$.k1') |
+--------------------------------------------+
|                                          1 |
+--------------------------------------------+
```

2. 获取 key 为 "my.key" 的数组中第二个元素

```
mysql> SELECT get_json_int('{"k1":"v1", "my.key":[1, 2, 3]}', '$."my.key"[1]');
+------------------------------------------------------------------+
| get_json_int('{"k1":"v1", "my.key":[1, 2, 3]}', '$."my.key"[1]') |
+------------------------------------------------------------------+
|                                                                2 |
+------------------------------------------------------------------+
```

3. 获取二级路径为 k1.key -> k2 的数组中，第一个元素
```
mysql> SELECT get_json_int('{"k1.key":{"k2":[1, 2]}}', '$."k1.key".k2[0]');
+--------------------------------------------------------------+
| get_json_int('{"k1.key":{"k2":[1, 2]}}', '$."k1.key".k2[0]') |
+--------------------------------------------------------------+
|                                                            1 |
+--------------------------------------------------------------+
```
## keyword
GET_JSON_INT,GET,JSON,INT