MyBatis-Plus入门3

update 更新

// 参考：https://mp.baomidou.com/guide/crud-interface.html#update

// 根据 UpdateWrapper 条件，更新记录 需要设置sqlset
boolean update(Wrapper<T> updateWrapper);
// 根据 whereEntity 条件，更新记录
boolean update(T entity, Wrapper<T> updateWrapper);
// 根据 ID 选择修改
boolean updateById(T entity);
// 根据ID 批量更新
boolean updateBatchById(Collection<T> entityList);
// 根据ID 批量更新
boolean updateBatchById(Collection<T> entityList, int batchSize);

package com.mp;

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.service.additional.update.impl.LambdaUpdateChainWrapper;
import com.mp.dao.UserMapper;
import com.mp.entity.User;
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.SpringRunner;

import java.time.LocalDateTime;

/**
 * @Description
 * @auther mohuani
 * @create 2019-12-24 23:01
 */

@RunWith(SpringRunner.class)
@SpringBootTest
public class UpdateTest {

    @Autowired
    private UserMapper userMapper;

    @Test
    public void updateById() {
        User user = new User();
        user.setId(1088248166370832385L);
        user.setAge(26);
        user.setEmail("[email protected]");
        int rows = userMapper.updateById(user);
        System.out.println("影响记录条数：" + rows);
    }

    /**
     * 通过Wrapper形式
     */
    @Test
    public void updateByWrapper() {
        UpdateWrapper<User> updateWrapper = new UpdateWrapper<>();
        updateWrapper.eq("name", "李艺伟").eq("age", 28);
        User user = new User();
        user.setEmail("[email protected]");
        user.setAge(29);
        int rows = userMapper.update(user, updateWrapper);
        System.out.println("影响记录条数：" + rows);
    }

    /**
     * 构造where条件的时候直接设置update的内容
     */
    @Test
    public void updateByWrapper3() {
        UpdateWrapper<User> updateWrapper = new UpdateWrapper<>();
        updateWrapper.eq("name", "李艺伟").eq("age", 29).set("age", 30);
        User user = new User();
        user.setEmail("[email protected]");
        user.setAge(29);
        int rows = userMapper.update(user, updateWrapper);
        System.out.println("影响记录条数：" + rows);
    }

    /**
     * 通过Lambda形式
     */
    @Test
    public void updateByWrapper4() {
        LambdaUpdateWrapper<User> lambdaUpdateWrapper = Wrappers.lambdaUpdate();
        lambdaUpdateWrapper.eq(User::getName, "李艺伟").eq(User::getAge, 30).set(User::getAge, 31);

        int rows = userMapper.update(null, lambdaUpdateWrapper);
        System.out.println("影响记录条数：" + rows);
    }

    /**
     * 通过Lambda形式
     */
    @Test
    public void updateByWrapper5() {
        boolean update = new LambdaUpdateChainWrapper<>(userMapper)
                .eq(User::getName, "李艺伟").eq(User::getAge, 31).set(User::getAge, 32).update();
        System.out.println(update);
    }
}

删除 delete

// 参考：https://mp.baomidou.com/guide/crud-interface.html#delete

// 根据 entity 条件，删除记录
int delete(@Param(Constants.WRAPPER) Wrapper<T> wrapper);
// 删除（根据ID 批量删除）
int deleteBatchIds(@Param(Constants.COLLECTION) Collection<? extends Serializable> idList);
// 根据 ID 删除
int deleteById(Serializable id);
// 根据 columnMap 条件，删除记录
int deleteByMap(@Param(Constants.COLUMN_MAP) Map<String, Object> columnMap);

package com.mp;

import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
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.service.additional.update.impl.LambdaUpdateChainWrapper;
import com.mp.dao.UserMapper;
import com.mp.entity.User;
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.SpringRunner;

import java.util.Arrays;
import java.util.HashMap;
import java.util.Map;

/**
 * @Description
 * @auther mohuani
 * @create 2019-12-24 23:01
 */

@RunWith(SpringRunner.class)
@SpringBootTest
public class DeleteTest {

    @Autowired
    private UserMapper userMapper;

    @Test
    public void deleteById() {
        int rows = userMapper.deleteById(1088248166370832385L);
        System.out.println("删除记录条数：" + rows);
    }

    /**
     * 构造where条件删除
     */
    @Test
    public void deleteByMap() {
        Map<String, Object> columnMap = new HashMap<>();
        columnMap.put("name", "刘明强5");
        columnMap.put("age", 31);

        int rows = userMapper.deleteByMap(columnMap);
        System.out.println("删除记录条数：" + rows);
    }

    /**
     * 批量删除
     */
    @Test
    public void deleteBatchIds() {
        int rows = userMapper.deleteBatchIds(Arrays.asList(1209754139000852481L, 1209838254358319105L, 1209838329864204289L));
        System.out.println("删除记录条数：" + rows);
    }


    /**
     * 通过Lambda形式
     */
    @Test
    public void updateByWrapper4() {
        LambdaQueryWrapper<User> lambdaQuery = Wrappers.lambdaQuery();
        lambdaQuery.gt(User::getAge, 35).lt(User::getAge, 40);
        int rows = userMapper.delete(lambdaQuery);
        System.out.println("影响记录条数：" + rows);
    }

}