import tk.mybatis.mapper.common.Mapper;需要什么依赖

需要引入MyBatis通用Mapper的依赖，如下所示：

<dependency>
    <groupId>tk.mybatis</groupId>
    <artifactId>mapper</artifactId>
    <version>4.1.5</version>
</dependency>

相关问题

import tk.mybatis.mapper.common.Mapper;

As an AI language model, I don't have the ability to provide an explanation of the code snippet you provided. However, I can tell you that `tk.mybatis.mapper.common.Mapper` is a Java interface that provides common database operations for MyBatis-based applications. It defines methods for CRUD (create, read, update, delete) operations, as well as other database-related operations. The interface is typically implemented by MyBatis mappers, which are Java classes that map database tables to Java objects.

使用代码案例详解tk.mybatis的使用

当使用tk.mybatis时，可以按照以下步骤进行操作：

1. 首先，在你的项目中添加tk.mybatis的依赖。可以在pom.xml文件中添加以下代码：

<dependency>
    <groupId>tk.mybatis</groupId>
    <artifactId>mapper-spring-boot-starter</artifactId>
    <version>版本号</version>
</dependency>

2. 创建一个实体类，该实体类对应数据库中的一张表。例如，创建一个名为User的实体类：

import javax.persistence.*;

@Table(name = "user")
public class User {
    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private Integer id;

    private String username;

    private String password;

    // getters and setters
}

3. 创建一个Mapper接口，继承tk.mybatis.mapper.common.Mapper接口。例如，创建一个名为UserMapper的接口：

import tk.mybatis.mapper.common.Mapper;

public interface UserMapper extends Mapper<User> {
}

4. 在配置文件中配置Mapper扫描路径和数据库连接信息。例如，在application.properties文件中添加以下代码：

# 数据库连接信息
spring.datasource.url=jdbc:mysql://localhost:3306/db_name?useUnicode=true&characterEncoding=utf-8&useSSL=false
spring.datasource.username=root
spring.datasource.password=root

# Mapper扫描路径
mapper.scan-package=com.example.mapper

5. 在Service层中使用UserMapper进行数据库操作。例如，在UserService中注入UserMapper，并调用相应的方法：

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import tk.mybatis.mapper.entity.Example;

import java.util.List;

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

    public List<User> getAllUsers() {
        return userMapper.selectAll();
    }

    public User getUserById(Integer id) {
        return userMapper.selectByPrimaryKey(id);
    }

    public void addUser(User user) {
        userMapper.insertSelective(user);
    }

    public void updateUser(User user) {
        userMapper.updateByPrimaryKeySelective(user);
    }

    public void deleteUser(Integer id) {
        userMapper.deleteByPrimaryKey(id);
    }
}

以上就是使用tk.mybatis的基本操作步骤，通过继承Mapper接口，可以实现常见的数据库操作方法。你可以根据具体的需求进行扩展和定制。希望可以帮到你！