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    <!--确定spring boot的版本-->
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.3.5.RELEASE</version>
    </parent>

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<dependencies>
        <!-- web 开发 -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <!--MySQL数据库驱动-->
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
        </dependency>
        <!--支持lombok-->
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
        </dependency>
        <!--测试-->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
        </dependency>
        <!-- https://mvnrepository.com/artifact/com.baomidou/mybatis-plus-boot-starter -->
        <dependency>
            <groupId>com.baomidou</groupId>
            <artifactId>mybatis-plus-boot-starter</artifactId>
            <version>3.4.0</version>
        </dependency>
    </dependencies>

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spring:
  datasource:
    driver-class-name: com.mysql.jdbc.Driver
    url: jdbc:mysql://localhost:3306/cloud_db1?useUnicode=true&characterEncoding=UTF-8&serverTimezone=UTC
    username: root
    password: 1234
mybatis-plus:
  configuration:
    log-impl: org.apache.ibatis.logging.stdout.StdOutImpl  #输出日志

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CREATE TABLE `tmp_customer` (
  `cid` int(11) NOT NULL AUTO_INCREMENT,
  `cname` varchar(50) DEFAULT NULL,
  `password` varchar(32) DEFAULT NULL,
  `telephone` varchar(11) DEFAULT NULL,
  `money` double DEFAULT NULL,
  `version` int(11) DEFAULT NULL,
  `create_time` date DEFAULT NULL,
  `update_time` date DEFAULT NULL,
  PRIMARY KEY (`cid`)
);

insert  into `tmp_customer`(`cid`,`cname`,`password`,`telephone`,`money`,`version`,`create_time`,`update_time`) 
values (1,'jack','1234','110',1000,NULL,NULL,NULL),(2,'rose','1234','112',1000,NULL,NULL,NULL),(3,'tom','1234','119',1000,NULL,NULL,NULL);

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package com.czxy.domain;

import com.baomidou.mybatisplus.annotation.IdType;
import com.baomidou.mybatisplus.annotation.TableField;
import com.baomidou.mybatisplus.annotation.TableId;
import com.baomidou.mybatisplus.annotation.TableName;
import lombok.Data;

import java.util.List;

@Data
@TableName("tmp_customer")
public class Customer {
    @TableId(type = IdType.AUTO)
    private Integer cid;
    private String cname;
    private String password;
    private String telephone;
    private String money;

    private Integer version;

    @TableField(exist = false)
    private List<Integer> ids;
}

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package com.czxy.mp.mapper;

import com.baomidou.mybatisplus.core.mapper.BaseMapper;
import com.czxy.mp.domain.Customer;
import org.apache.ibatis.annotations.Mapper;

/**
 * Created by liangtong.
 */
@Mapper
public interface CustomerMapper extends BaseMapper<Customer> {
}

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package com.czxy.mp;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

/**
 * Created by liangtong.
 */
@SpringBootApplication
public class MybatisPlusApplication {
    public static void main(String[] args) {
        SpringApplication.run(MybatisPlusApplication.class, args);
    }
}

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package com.czxy;

import com.czxy.mp.MybatisPlusApplication;
import com.czxy.mp.domain.Customer;
import com.czxy.mp.mapper.CustomerMapper;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.test.context.junit4.SpringRunner;

import javax.annotation.Resource;
import java.util.List;

/**
 * Created by liangtong.
 */
@RunWith(SpringRunner.class)
@SpringBootTest(classes = MybatisPlusApplication.class)
public class TestDemo01 {
    @Resource
    private CustomerMapper customerMapper;

    @Test
    public void testFindAll() {
        List<Customer> list = customerMapper.selectList(null);
        list.forEach(System.out::println);
    }
}

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    @Test
    public void testInsert() {
        Customer customer = new Customer();
        customer.setCname("测试");

        customerMapper.insert(customer);
    }

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   @Test
    public void testInsert() {
        Customer customer = new Customer();
        customer.setCname("测试");
        customerMapper.insert(customer);
        System.out.println(customer);
    }

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    @Test
    public void testUpdate() {
        Customer customer = new Customer();
        customer.setCid(15);
        customer.setCname("测试777");
        customer.setPassword("777");

        // 需要给Customer设置@TableId
        customerMapper.updateById(customer);
    }

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	@Test
    public void testUpdate2() {
        Customer customer = new Customer();
        customer.setCname("测试777");
        customer.setPassword("777");
        // 更新所有
        customerMapper.update(customer,null);
    }

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@Test
    public void testDelete() {
        // 需要给Customer设置@TableId
        int i = customerMapper.deleteById(11);
        System.out.println(i);
    }

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    @Test
    public void testBatchDelete() {
        // 需要给Customer设置@TableId
        int i = customerMapper.deleteBatchIds(Arrays.asList(9,10));
        System.out.println(i);
    }

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    @Test
    public void testMap(){
        Map map = new HashMap();
        map.put("cname","测试");
        map.put("password","123456");

        List list = customerMapper.selectByMap(map);
        list.forEach(System.out::println);
    }

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	@Test
    public void testWrapper(){
        // 拼凑条件
        QueryWrapper<Customer> queryWrapper = new QueryWrapper();
        // 1）模糊查询
        queryWrapper.like("cname","测试");
        // 2）等值查询
        queryWrapper.eq("password","777");
        // 3）批量查询
        queryWrapper.in("cid",1,2,3,4);

        // 查询
        List<Customer> list = customerMapper.selectList(queryWrapper);
        list.forEach(System.out::println);
    }

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 @Test
    public void findCondition2() {
        Customer customer = new Customer();
        customer.setPassword("777");
        customer.setCname("888");
        customer.setIdList(Arrays.asList(2,3,4));
        customer.setCid(3);
        //条件查询
        QueryWrapper<Customer> queryWrapper = new QueryWrapper<>();
        // 1) 等值查询
        queryWrapper.eq( customer.getPassword()!=null ,"password", customer.getPassword());
        // 2) 模糊查询
        queryWrapper.like(customer.getCname() != null , "cname",customer.getCname());
        // 3) in语句
        queryWrapper.in(customer.getIdList() != null , "cid",customer.getIdList());
        // 4) 大于等于
        queryWrapper.ge(customer.getCid() != null , "cid" , customer.getCid());


        //查询
        List<Customer> list = customerMapper.selectList(queryWrapper);
        //list.forEach(customer-> System.out.println(customer));
        list.forEach(System.out::println);

    }

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 	@Test
    public void testWrapperUpdate(){
        // 数据
        Customer customer = new Customer();
        customer.setCname("测试888");

        // 拼凑条件
        QueryWrapper<Customer> queryWrapper = new QueryWrapper();
        queryWrapper.in("cid",1,2,3,4);


        // 更新
        int result = customerMapper.update(customer, queryWrapper);
        System.out.println(result);
    }

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package com.czxy.mp.config;

import com.baomidou.mybatisplus.annotation.DbType;
import com.baomidou.mybatisplus.autoconfigure.ConfigurationCustomizer;
import com.baomidou.mybatisplus.extension.plugins.MybatisPlusInterceptor;
import com.baomidou.mybatisplus.extension.plugins.inner.PaginationInnerInterceptor;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;


@Configuration
public class MybatisPlusConfig {

    /**
     * 配置插件
     * @return
     */
    @Bean
    public MybatisPlusInterceptor mybatisPlusInterceptor(){

        MybatisPlusInterceptor mybatisPlusInterceptor = new MybatisPlusInterceptor();
        // 分页插件
        mybatisPlusInterceptor.addInnerInterceptor(new PaginationInnerInterceptor(DbType.MYSQL));

        return mybatisPlusInterceptor;
    }

    /**
     * 新的分页插件,一缓和二缓遵循mybatis的规则,需要设置 MybatisConfiguration#useDeprecatedExecutor = false 避免缓存出现问题(该属性会在旧插件移除后一同移除)
     * @return
     */
    @Bean
    public ConfigurationCustomizer configurationCustomizer() {
        return configuration -> configuration.setUseDeprecatedExecutor(false);
    }
}

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@Test
    public void testPage(){
        // 分页数据
        int pageNum = 1;
        int pageSize = 3;
        Page<Customer> page = new Page<>(pageNum , pageSize);
        page.setSearchCount(true);

        // 查询
        customerMapper.selectPage(page, null);

        // 分页数据
        System.err.println("当前页码：" + page.getCurrent());
        System.err.println("每页显示记录数：" + page.getSize());
        System.err.println("总页数：" + page.getPages());
        System.err.println("总记录数：" + page.getTotal());
        System.err.println("是否有下一页：" + page.hasNext());
        System.err.println("是否有上一页：" + page.hasPrevious());
        // 分页数据列表
        page.getRecords().forEach(System.err::println);
    }

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mybatis-plus:
  configuration:
    log-impl: org.apache.ibatis.logging.stdout.StdOutImpl  #输出日志
    map-underscore-to-camel-case: true  #驼峰命名
  global-config:
    db-config:
      id-type: auto  #全局配置，id自动增强
      table-prefix: tmp_ #表名前缀
  type-aliases-package: com.czxy.mp.domain #别名包扫描路径
  mapper-locations: classpath*:/mapper/**/*.xml #映射文件位置

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alter table tmp_customer add column create_time date;
alter table tmp_customer add column update_time date;

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package com.czxy.mp.domain;

import com.baomidou.mybatisplus.annotation.*;
import lombok.Data;

import java.util.Date;

/**
 * Created by liangtong.
 */
@Data
@TableName("tmp_customer")
public class Customer {
    @TableId(type = IdType.AUTO)
    private Integer cid;
    private String cname;
    private String password;
    private String telephone;
    private String money;

    @TableField(value="create_time",fill = FieldFill.INSERT)
    private Date createTime;

    @TableField(value="update_time",fill = FieldFill.UPDATE)
    private Date updateTime;

}

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package com.czxy.mp.handler;

import com.baomidou.mybatisplus.core.handlers.MetaObjectHandler;
import org.apache.ibatis.reflection.MetaObject;
import org.springframework.stereotype.Component;

import java.util.Date;


@Component
public class MyMetaObjectHandler implements MetaObjectHandler {
    /**
     * 插入填充
     * @param metaObject
     */
    @Override
    public void insertFill(MetaObject metaObject) {
        this.setFieldValByName("createTime", new Date(), metaObject);
    }

    /**
     * 更新填充
     * @param metaObject
     */
    @Override
    public void updateFill(MetaObject metaObject) {
        this.setFieldValByName("updateTime", new Date(), metaObject);
    }
}

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    @Test
    public void testInsert() {
        Customer customer = new Customer();
        customer.setCname("测试888");

        customerMapper.insert(customer);
    }

    @Test
    public void testUpdate() {
        Customer customer = new Customer();
        customer.setCid(11);
        customer.setTelephone("999");

        customerMapper.updateById(customer);
    }

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package com.czxy.mp.domain;

import com.baomidou.mybatisplus.annotation.*;
import lombok.Data;

/**
 * Created by liangtong.
 */
@Data
@TableName("tmp_customer")
public class Customer {
    @TableId(type = IdType.AUTO)
    private Integer cid;
    private String cname;
    private String password;
    private String telephone;
    private String money;
    @Version
    @TableField(fill = FieldFill.INSERT)
    private Integer version;
}

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package com.czxy.mp.config;

import com.baomidou.mybatisplus.core.handlers.MetaObjectHandler;
import org.apache.ibatis.reflection.MetaObject;
import org.springframework.stereotype.Component;

import java.util.Date;

/**
 * Created by liangtong.
 */
@Component
public class MyMetaObjectHandler implements MetaObjectHandler {
    /**
     * 插入填充
     * @param metaObject
     */
    @Override
    public void insertFill(MetaObject metaObject) {
        this.setFieldValByName("createTime", new Date(), metaObject);
        this.setFieldValByName("version", 1, metaObject);
    }

    /**
     * 更新填充
     * @param metaObject
     */
    @Override
    public void updateFill(MetaObject metaObject) {
        this.setFieldValByName("updateTime", new Date(), metaObject);
    }
}

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package com.czxy.mp.config;

import com.baomidou.mybatisplus.annotation.DbType;
import com.baomidou.mybatisplus.extension.plugins.MybatisPlusInterceptor;
import com.baomidou.mybatisplus.extension.plugins.OptimisticLockerInterceptor;
import com.baomidou.mybatisplus.extension.plugins.inner.OptimisticLockerInnerInterceptor;
import com.baomidou.mybatisplus.extension.plugins.inner.PaginationInnerInterceptor;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

/**
 * Created by liangtong.
 */
@Configuration
public class MybatisPlusConfig {
     */
    /**
     * 配置插件
     * @return
     */
    @Bean
    public MybatisPlusInterceptor mybatisPlusInterceptor(){

        MybatisPlusInterceptor mybatisPlusInterceptor = new MybatisPlusInterceptor();
        // 分页插件
        mybatisPlusInterceptor.addInnerInterceptor(new PaginationInnerInterceptor(DbType.MYSQL));
        // 乐观锁
        mybatisPlusInterceptor.addInnerInterceptor(new OptimisticLockerInnerInterceptor());

        return mybatisPlusInterceptor;
    }
}

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    @Test
    public void testUpdate() {
        Customer customer = new Customer();
        customer.setCid(14);
        customer.setCname("测试999");
        // 与数据库中数据一致，将更新成功，否则返回失败。
        customer.setVersion(1);

        int i = customerMapper.updateById(customer);
        System.out.println(i);
    }

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package com.czxy.mp.domain;

import com.baomidou.mybatisplus.annotation.*;
import lombok.Data;

/**
 * Created by liangtong.
 */
@Data
@TableName("tmp_customer")
public class Customer {
    @TableId(type = IdType.AUTO)
    private Integer cid;
    private String cname;
    private String password;
    private String telephone;
    private String money;
    @Version
    @TableField(fill = FieldFill.INSERT)
    private Integer version;

    @TableLogic
    @TableField(fill = FieldFill.INSERT)
    private Integer deleted;
}

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package com.czxy.mp.config;

import com.baomidou.mybatisplus.core.handlers.MetaObjectHandler;
import org.apache.ibatis.reflection.MetaObject;
import org.springframework.stereotype.Component;

import java.util.Date;

/**
 * Created by liangtong.
 */
@Component
public class MyMetaObjectHandler implements MetaObjectHandler {
    /**
     * 插入填充
     * @param metaObject
     */
    @Override
    public void insertFill(MetaObject metaObject) {
        this.setFieldValByName("createTime", new Date(), metaObject);
        this.setFieldValByName("version", 1, metaObject);
        this.setFieldValByName("deleted", 0, metaObject);
    }

    /**
     * 更新填充
     * @param metaObject
     */
    @Override
    public void updateFill(MetaObject metaObject) {
        this.setFieldValByName("updateTime", new Date(), metaObject);
    }
}

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    @Test
    public void testDelete() {
        // 删除时，必须保证deleted数据为“逻辑未删除值”
        int i = customerMapper.deleteById(12);
        System.out.println(i);
    }

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mybatis-plus:
  global-config:
    db-config:
      logic-delete-field: deleted  # 局逻辑删除的实体字段名
      logic-delete-value: 1  # 逻辑已删除值(默认为 1)
      logic-not-delete-value: 0 # 逻辑未删除值(默认为 0)

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  package com.czxy.service;
  
  import com.baomidou.mybatisplus.extension.service.IService;
  import com.czxy.domain.Customer;
  

  public interface CustomerService extends IService<Customer> {
  }
  

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package com.czxy.service.impl;

import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.czxy.domain.Customer;
import com.czxy.mapper.CustomerMapper;
import com.czxy.service.CustomerService;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;


@Service
@Transactional
public class CustomerServiceImpl extends ServiceImpl<CustomerMapper,Customer> implements CustomerService {

}