mybatis mapper模糊查询

在 MyBatis 中进行模糊查询，你可以使用 SQL 的 LIKE 关键字配合通配符来实现。在 Mapper XML 文件中，你可以使用以下方式进行模糊查询：

<select id="searchUsers" parameterType="String" resultType="User">
  SELECT * FROM users WHERE username LIKE CONCAT('%', #{keyword}, '%')
</select>

上述示例中，`searchUsers` 是查询语句的唯一标识符，`parameterType` 是传递给查询语句的参数类型，`resultType` 是查询结果的返回类型。在查询语句中，我们使用了 `LIKE CONCAT('%', #{keyword}, '%')` 来进行模糊查询，其中 `#{keyword}` 是传递的参数。`%` 是通配符，表示匹配任意字符。

你可以根据自己的需求修改表名、字段名和参数名等信息来适配你的实际情况。希望这能帮到你！如有更多疑问，请继续提问。

相关问题

springboot mybatis做模糊查询mapper的配置

好的，关于springboot mybatis做模糊查询mapper的配置，你可以参考以下步骤：

1.在mapper.xml文件中编写模糊查询语句，如：

<select id="findUserByUsernameLike" resultType="User">
    select * from user where username like '%${username}%'
</select>

2.在mapper接口中定义方法，如：

List<User> findUserByUsernameLike(String username);

3.在service中调用mapper中的方法，如：

public List<User> findUserByUsernameLike(String username) {
    return userDao.findUserByUsernameLike(username);
}

4.在controller中调用service中的方法，如：

@GetMapping("/user/like")
public List<User> findUserByUsernameLike(@RequestParam String username) {
    return userService.findUserByUsernameLike(username);
}

这样就完成了springboot mybatis做模糊查询mapper的配置。希望可以帮到你。

mybatis like 模糊查询

MyBatis provides a way to perform like or fuzzy queries using the `LIKE` operator in SQL. To implement a like query in MyBatis, you need to use the `#{}` notation to pass the search pattern as a parameter.

Here's an example of how you can perform a like query using MyBatis:

<select id="searchUsers" resultType="User">
  SELECT * FROM users WHERE username LIKE #{searchTerm}
</select>

In this example, the `searchTerm` is the parameter that you can pass from your Java code. You can use wildcards such as `%` and `_` in the search pattern to match any characters or a single character, respectively.

To execute this query and retrieve the results, you can use the MyBatis `SqlSession` object:

String searchTerm = "%john%"; // The search pattern
List<User> users = sqlSession.selectList("searchUsers", searchTerm);

In this code snippet, `searchUsers` is the id of the SQL query defined in the XML mapper file, and `searchTerm` is the value that will be substituted into the `LIKE` clause.

Remember to properly handle any input parameters to avoid SQL injection vulnerabilities. You can use prepared statements or other mechanisms provided by MyBatis or your database to ensure safe parameter handling.