@Configuration
// 配置掃描mapper的路徑
@MapperScan("com.pingguo.mpdemo.mapper")
public class MpConfig {
    // 樂觀鎖插件
    @Bean
    public OptimisticLockerInterceptor optimisticLockerInterceptor() {
        return new OptimisticLockerInterceptor();
    }
   // 分頁插件
    @Bean
    public PaginationInterceptor paginationInterceptor() {
        return new PaginationInterceptor();
    }
}

    //  測試分頁
    @Test
    void testPaging() {
        // 創(chuàng)建分頁對象，current為當(dāng)前頁數(shù)，size為每頁最大記錄數(shù)
        Page<User> pageUser = new Page<>(1, 5);
        // 調(diào)用分頁查詢方法，傳入分頁對象-pageUser，wrapper是構(gòu)造條件對象，這里暫時寫null
        userMapper.selectPage(pageUser, null);
        System.out.println("當(dāng)前頁："+ pageUser.getCurrent());
        System.out.println("當(dāng)前頁數(shù)據(jù)list集合:" + pageUser.getRecords());
        System.out.println("每頁顯示記錄數(shù):" + pageUser.getSize());
        System.out.println("總記錄數(shù):" + pageUser.getTotal());
        System.out.println("總頁數(shù):" + pageUser.getPages());
        System.out.println("是否有下一頁:" + pageUser.hasNext());
        System.out.println("是否有上一頁:" + pageUser.hasPrevious());
    }

當(dāng)前頁：1
當(dāng)前頁數(shù)據(jù)list集合:[User(id=2, name=修改名稱222, age=19, email=pingguotest1@pingguo.com, createTime=Thu Dec 24 23:27:20 CST 2020, updateTime=Thu Dec 24 23:27:23 CST 2020, version=null), User(id=3, name=wesson3, age=20, email=pingguotest1@pingguo.com, createTime=Wed Dec 23 23:27:32 CST 2020, updateTime=Thu Dec 24 23:27:36 CST 2020, version=null), User(id=4, name=daxiong, age=22, email=pingguotest1@pingguo.com, createTime=null, updateTime=Fri Dec 25 00:55:02 CST 2020, version=null), User(id=5, name=wesson5, age=20, email=pingguotest1@pingguo.com, createTime=null, updateTime=null, version=null), User(id=1342322873243996161, name=李白6, age=66, email=laowang@123.com, createTime=Fri Dec 25 12:14:47 CST 2020, updateTime=Fri Dec 25 15:43:11 CST 2020, version=2)]
每頁顯示記錄數(shù):5
總記錄數(shù):12
總頁數(shù):3
是否有下一頁:true
是否有上一頁:false

@Data
public class User {
    @TableId(type = IdType.ID_WORKER)
    private Long id;
    private String name;
    ... ...
    @TableLogic   // 加上邏輯刪除注解
    @TableField(fill = FieldFill.INSERT) //為了方便，加了自動填充
    private Integer deleted;
}

@Component //此注解表示 將其交給spring去管理
public class MyMetaObjectHandler implements MetaObjectHandler {
    @Override
    public void insertFill(MetaObject metaObject) {
        this.setFieldValByName("createTime", new Date(), metaObject);
        this.setFieldValByName("updateTime", new Date(), metaObject);
        this.setFieldValByName("version", 0, metaObject); //為了第一次新增就設(shè)置版本值
        this.setFieldValByName("deleted", 0, metaObject); //新增數(shù)據(jù)就默認(rèn)設(shè)置0
    }
}

mybatis-plus.global-config.db-config.logic-delete-value=100
mybatis-plus.global-config.db-config.logic-not-delete-value=300

@Configuration
// 配置掃描mapper的路徑
@MapperScan("com.pingguo.mpdemo.mapper")
public class MpConfig {
    // 樂觀鎖插件
    @Bean
    public OptimisticLockerInterceptor optimisticLockerInterceptor() {
        return new OptimisticLockerInterceptor();
    }
    ... ...
    // 邏輯刪除
    @Bean
    public ISqlInjector sqlInjector() {
        return new LogicSqlInjector();
    }
}

     // 測試 邏輯刪除
    @Test
     void testLogicDelete() {
        int result = userMapper.deleteById(2L);
        System.out.println(result);
    }

JDBC Connection [HikariProxyConnection@2144912729 wrapping com.mysql.cj.jdbc.ConnectionImpl@44c13103] will not be managed by Spring
==>  Preparing: UPDATE user SET deleted=1 WHERE id=? AND deleted=0 
==> Parameters: 2(Long)
<==    Updates: 1
Closing non transactional SqlSession [org.apache.ibatis.session.defaults.DefaultSqlSession@10f19647]
1

    //    查詢
    @Test
     void findAll() {
        List<User> users =  userMapper.selectList(null);
        System.out.println(users);
    }

SELECT id,name,age,email,create_time,update_time,version,deleted FROM user WHERE deleted=0