mybatis更新in
时间: 2023-12-07 10:40:03 浏览: 25
以下是使用MyBatis进行更新in操作的示例代码:
```xml
<update id="updateBatch" parameterType="java.util.List">
update user set name = #{name} where id in
<foreach collection="list" item="id" open="(" separator="," close=")">
#{id}
</foreach>
</update>
```
这个示例中,我们使用了`<foreach>`标签来遍历传入的id列表,并将其拼接成SQL语句中的in条件。这样,我们就可以批量更新符合条件的记录了。
需要注意的是,这里的`parameterType`必须为`java.util.List`,因为我们要传入一个id列表。
相关问题
mybatis not in
MyBatis is a popular Java-based persistence framework that provides support for mapping SQL queries to Java objects. The "NOT IN" clause is a feature of SQL, not directly related to MyBatis.
To use the "NOT IN" clause in your MyBatis query, you can utilize the `<foreach>` tag in combination with the SQL fragment. Here's an example:
```xml
<select id="getUsers" resultType="User">
SELECT * FROM users
WHERE id NOT IN
<foreach item="item" collection="idList" open="(" separator="," close=")">
#{item}
</foreach>
</select>
```
In this example, `idList` is a parameter passed to the query containing the list of IDs to exclude from the result. The `<foreach>` tag iterates over the `idList` and constructs the "NOT IN" clause dynamically.
You can customize this example based on your specific requirements and adjust the query accordingly. Remember to define the `idList` parameter in your mapper interface or XML file.
I hope this helps! Let me know if you have any further questions.
mybatis plus in
Mybatis plus中的in查询是指在查询时使用in关键字,查询某个字段的值是否在一个给定的列表中。在Mybatis plus中,可以使用LambdaQueryWrapper或者QueryWrapper的in方法来实现in查询。其中,LambdaQueryWrapper是Mybatis plus中的一个查询构造器,可以通过Lambda表达式来构造查询条件,而QueryWrapper则是Mybatis plus中另一个查询构造器,可以通过链式调用的方式来构造查询条件。使用LambdaQueryWrapper或者QueryWrapper的in方法,可以方便地实现in查询。