一、 建立实体类（以user为例）

  • enitity包下------>>> User.java
import com.baomidou.mybatisplus.annotation.IdType;
import com.baomidou.mybatisplus.annotation.TableId;
import com.baomidou.mybatisplus.annotation.TableName;
import lombok.Data;

import java.io.Serializable;

@Data
@TableName("S_USER")//和数据库的's_user'表关联
public class User implements Serializable {
    private static final long serialVersionUID = -6665306065936529132L;
    @TableId(type = IdType.AUTO)
    private Long id;
    private String username;
    private String password;

    public static long getSerialVersionUID() {
        return serialVersionUID;
    }

    public Long getId() {
        return id;
    }

    public void setId(Long id) {
        this.id = id;
    }

    public String getUsername() {
        return username;
    }

    public void setUsername(String username) {
        this.username = username;
    }

    public String getPassword() {
        return password;
    }

    public void setPassword(String password) {
        this.password = password;
    }
}

二、 创建Mapper

  • mapper包下------->> UserMapper.iterface
import com.baomidou.mybatisplus.core.mapper.BaseMapper;
import com.entity.User;

public interface UserMapper extends BaseMapper<User> {

}

三、 创建Service

  • service包下------->> UserService.interface
import com.baomidou.mybatisplus.extension.service.IService;
import com.entity.User;

public interface UserService extends IService<User> {
}

四、 通过Service建立ServiceImpl

Alt+Enter---> implements interface

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