文章目錄

• • • 1. 實體類
    • 2. 實戰

1. 實體類

原則：繼承Model

package com.gblfy.springboot.mybatisplus.entity;import com.baomidou.mybatisplus.annotation.TableField; import com.baomidou.mybatisplus.annotation.TableName; import com.baomidou.mybatisplus.extension.activerecord.Model; import lombok.AllArgsConstructor; import lombok.Builder; import lombok.Data; import lombok.NoArgsConstructor;import java.time.LocalDateTime;@Data @AllArgsConstructor @NoArgsConstructor @Builder @TableName("user") public class User extends Model<User> {private Long id;private String name;private Integer age;private String email;//數據庫沒有此字段 只為了封裝演示@TableField(exist = false)private String remark; }

2. 實戰

package com.gblfy.springboot.mybatisplus.mapper;import com.baomidou.mybatisplus.core.conditions.update.LambdaUpdateWrapper; import com.baomidou.mybatisplus.core.conditions.update.UpdateWrapper; import com.baomidou.mybatisplus.core.toolkit.Wrappers; import com.baomidou.mybatisplus.extension.conditions.update.LambdaUpdateChainWrapper; import com.gblfy.springboot.mybatisplus.entity.User; import lombok.extern.slf4j.Slf4j; import org.junit.Test; import org.junit.runner.RunWith; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.boot.test.context.SpringBootTest; import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;@RunWith(SpringJUnit4ClassRunner.class) @SpringBootTest @Slf4j public class UserARTest {@Testpublic void insertAR(){User user = new User();user.setName("劉華");user.setAge(20);user.setEmail("test@gblfy.com");boolean insert = user.insert();System.out.println(insert);}@Testpublic void selectByIdAR(){User user = new User();User user1 = user.selectById(111L);System.out.println(user == user1);System.out.println(user1);}@Testpublic void selectByIdAR2(){User user = new User();user.setId(11L);User user1 = user.selectById();System.out.println(user == user1);System.out.println(user1);}@Testpublic void updateByIdAR(){User user = new User();user.setId(11L);user.setName("你的納斯達克");boolean user1 = user.updateById();System.out.println(user1);}@Testpublic void delByIdAR(){User user = new User();user.setId(11L);boolean user1 = user.deleteById();System.out.println(user1);} }

總結

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