mybatis-plus中mapper-location

在MyBatis-Plus中，`mapper-location`是用来指定Mapper接口映射文件的位置。Mapper接口映射文件是通过MyBatis-Plus生成的，包含了一些SQL语句和映射配置。通过`mapper-location`属性，我们可以告诉MyBatis-Plus框架Mapper接口映射文件的存放路径。

下面是一个示例配置：

mybatis-plus.mapper-locations=classpath:mapper/*.xml

这个配置表示Mapper接口映射文件存放在`classpath:mapper/`目录下，且文件类型为XML。

相关问题

mybatis-plus. mapper-locations

MyBatis-Plus is an enhanced version of MyBatis, which is a popular Java persistence framework for working with SQL databases. It provides additional features and simplifies the development process.

The `mapper-locations` property in MyBatis-Plus is used to specify the XML mapper files location. These XML files contain the SQL statements and mapping configurations for MyBatis to interact with the database.

You can specify multiple locations using comma-separated values or use wildcards to scan for XML files in a directory. For example:

mybatis-plus.mapper-locations=classpath*:mapper/**/*.xml

This configuration will search for XML files in the `mapper` directory and its subdirectories on the classpath.

You can also specify file paths using the `file:` prefix. For example:

mybatis-plus.mapper-locations=file:/path/to/mapper/*.xml

This configuration will look for XML files in the specified directory on the file system.

Make sure to provide the correct location(s) of your mapper XML files so that MyBatis-Plus can find and parse them correctly.

mybatis-plus配置

MyBatis-Plus 是 MyBatis 的增强工具，在使用 MyBatis-Plus 之前需要先集成 MyBatis。以下是 MyBatis-Plus 的配置步骤：

1. 引入 MyBatis-Plus 依赖

<dependency>
    <groupId>com.baomidou</groupId>
    <artifactId>mybatis-plus-boot-starter</artifactId>
    <version>3.4.3.1</version>
</dependency>

2. 配置 MyBatis-Plus

在 Spring Boot 的配置文件 application.yml 中添加以下配置：

mybatis-plus:
  # 实体类扫描包路径
  typeAliasesPackage: com.example.entity
  # mybatis 配置文件路径
  config-location: classpath:mybatis-config.xml
  # 是否开启驼峰命名规则（默认 true）
  configuration:
    map-underscore-to-camel-case: true

3. 编写实体类

MyBatis-Plus 会自动将实体类与数据库表进行映射，因此需要编写实体类，并在类上添加注解 @TableName，指定对应的数据库表名。

@Data
@TableName("user")
public class User {
    private Long id;
    private String name;
    private Integer age;
    private String email;
}

4. 编写 Mapper 接口

MyBatis-Plus 提供了 BaseMapper 接口，可以通过继承该接口来快速编写 Mapper 接口。

public interface UserMapper extends BaseMapper<User> {
}

5. 使用 MyBatis-Plus 进行数据库操作

@Service
public class UserService {
    @Autowired
    private UserMapper userMapper;

    public User getById(Long id) {
        return userMapper.selectById(id);
    }

    public List<User> getByName(String name) {
        QueryWrapper<User> wrapper = new QueryWrapper<>();
        wrapper.eq("name", name);
        return userMapper.selectList(wrapper);
    }

    public int save(User user) {
        return userMapper.insert(user);
    }

    public int updateById(User user) {
        return userMapper.updateById(user);
    }

    public int deleteById(Long id) {
        return userMapper.deleteById(id);
    }
}

以上就是 MyBatis-Plus 的配置步骤和使用示例。