mybatis plus条件构造器queryWrapper、updateWrapper

package com.lqf.crud;

import com.baomidou.mybatisplus.core.conditions.Wrapper;
import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.baomidou.mybatisplus.core.conditions.update.UpdateWrapper;
import com.baomidou.mybatisplus.core.metadata.IPage;
import com.baomidou.mybatisplus.core.toolkit.Constants;
import com.baomidou.mybatisplus.extension.plugins.pagination.Page;
import com.lqf.crud.bean.crm.User;
import com.lqf.crud.dao.crm.UserMapper;
import com.sun.org.apache.xerces.internal.util.EntityResolverWrapper;
import org.apache.ibatis.annotations.Param;
import org.apache.ibatis.session.RowBounds;
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 org.springframework.web.jsf.el.WebApplicationContextFacesELResolver;

import javax.naming.Name;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

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

  @Autowired
  private UserMapper mapper;

  /**
   * <p>
   * 根据根据 entity 条件，删除记录,QueryWrapper实体对象封装操作类（可以为 null）
   * 下方获取到queryWrapper后删除的查询条件为name字段为null的and年龄大于等于12的and email字段不为null的
   * 同理写法条件添加的方式就不做过多介绍了。
   * </p>
   */
  @Test
  public void delete() {
    QueryWrapper<User> queryWrapper = new QueryWrapper<>();
    queryWrapper
        .isNull("name")
        .ge("age", 12)
        .isNotNull("email");
    int delete = mapper.delete(queryWrapper);
    System.out.println("delete return count = " + delete);
  }


  /**
   * <p>
   * 根据 entity 条件，查询一条记录,
   * 这里和上方删除构造条件一样，只是seletOne返回的是一条实体记录，当出现多条时会报错
   * </p>
   */
  @Test
  public void selectOne() {
    QueryWrapper<User> queryWrapper = new QueryWrapper<>();
    queryWrapper.eq("name", "lqf");

    User user = mapper.selectOne(queryWrapper);
    System.out.println(user);
  }


  /**
   * <p>
   * 根据 Wrapper 条件，查询总记录数
   * </p>
   *
   * @param queryWrapper 实体对象
   */
  @Test
  public void selectCount() {
    QueryWrapper<User> queryWrapper = new QueryWrapper<>();
    queryWrapper.eq("name", "lqf");

    Integer count = mapper.selectCount(queryWrapper);
    System.out.println(count);
  }


  /**
   * <p>
   * 根据 entity 条件，查询全部记录
   * </p>
   *
   * @param queryWrapper 实体对象封装操作类（可以为 null）为null查询全部
   */
  @Test
  public void selectList() {
    List<User> list = mapper.selectList(null);

    System.out.println(list);
  }

  /**
   * <p>
   * 根据 Wrapper 条件，查询全部记录
   * </p>
   *
   * @param queryWrapper 实体对象封装操作类（可以为 null）
   */
  @Test
  public void selectMaps() {
    QueryWrapper<User> queryWrapper = new QueryWrapper<>();
    queryWrapper.isNotNull("name");
    List<Map<String, Object>> maps = mapper.selectMaps(queryWrapper);
    for (Map<String, Object> map : maps) {
      System.out.println(map);
    }
  }

  /**
   * 打印结果
   * {name=lqf, id=1046282328366391406, age=12, email=lqf@163.com, status=false}
   * {name=lqf, id=1046282328366391407, age=12, email=lqf@163.com, status=false}
   * {name=lqf, id=1046282328366391408, age=12, email=lqf@163.com, status=false}
   * {name=lqf, id=1046282328366391409, age=12, email=lqf@163.com, status=false}
   * {name=lqf, id=1046282328366391410, age=12, email=lqf@163.com, status=false}
   * {name=lqf, id=1046282328366391411, age=12, email=lqf@163.com, status=false}
   * {name=lqf, id=1046282328366391412, age=12, email=lqf@163.com, status=false}
   * {name=lqf, id=1046282328366391413, age=12, email=lqf@163.com, status=false}
   * {name=lqf, id=1046282328366391414, age=12, email=lqf@163.com, status=false}
   * {name=lqf, id=1046282328366391415, age=12, email=lqf@163.com, status=false}
   * {name=lqf, id=1046282328366391416, age=12, email=lqf@163.com, status=false}
   * {name=lqf, id=1046282328366391417, age=12, email=lqf@163.com, status=false}
   * {name=lqf, id=1046282328366391418, age=12, email=lqf@163.com, status=false}
   * json类型的键值对模式
   */

  /**
   * <p>
   * 根据 entity 条件，查询全部记录（并翻页）
   * </p>
   *
   * @param page     分页查询条件（可以为 RowBounds.DEFAULT）
   * @param queryWrapper 实体对象封装操作类（可以为 null）
   */
  @Test
  public void selectPage() {
    Page<User> page = new Page<>(1, 5);
    QueryWrapper<User> queryWrapper = new QueryWrapper<>();

    IPage<User> userIPage = mapper.selectPage(page, queryWrapper);
    System.out.println(userIPage);
  }

  /**
   * 打印结果
   * ==> Preparing: SELECT COUNT(1) FROM user
   * ==> Parameters:
   * <==  Columns: COUNT(1)
   * <==    Row: 100
   * ==> Preparing: SELECT id,name,age,email,status FROM user LIMIT 0,5
   * ==> Parameters:
   * <==  Columns: id, name, age, email, status
   * <==    Row: 1046282328366391319, lqf, 12, lqf@163.com, 0
   * <==    Row: 1046282328366391320, lqf, 12, lqf@163.com, 0
   * <==    Row: 1046282328366391321, lqf, 12, lqf@163.com, 0
   * <==    Row: 1046282328366391322, lqf, 12, lqf@163.com, 0
   * <==    Row: 1046282328366391323, lqf, 12, lqf@163.com, 0
   * <==   Total: 5
   *
   *
   * 这里需要在项目中加入分页插件
   *  @Bean
   *   public PaginationInterceptor paginationInterceptor() {
   *     return new PaginationInterceptor();
   *   }
   */


  /**
   * <p>
   * 根据 Wrapper 条件，查询全部记录（并翻页）
   * </p>
   *
   * @param page     分页查询条件
   * @param queryWrapper 实体对象封装操作类
   */
  @Test
  public void selectMapsPage() {
    Page<User> page = new Page<>(1, 5);
    QueryWrapper<User> queryWrapper = new QueryWrapper<>();

    IPage<Map<String, Object>> mapIPage = mapper.selectMapsPage(page, queryWrapper);
    System.out.println(mapIPage);
  }

  /**
   * 和上个分页同理只是返回类型不同
   */


  /**
   * <p>
   * 根据 whereEntity 条件，更新记录
   * </p>
   *
   * @param entity    实体对象 (set 条件值,不能为 null)
   * @param updateWrapper 实体对象封装操作类（可以为 null,里面的 entity 用于生成 where 语句）
   */
  @Test
  public void update() {

    //修改值
    User user = new User();
    user.setStatus(true);
    user.setName("zhangsan");

    //修改条件s
    UpdateWrapper<User> userUpdateWrapper = new UpdateWrapper<>();
    userUpdateWrapper.eq("name", "lqf");

    int update = mapper.update(user, userUpdateWrapper);

    System.out.println(update);
  }

  /**
   * 打印结果
   * ==> Preparing: UPDATE user SET name=?, status=? WHERE name = ?
   * ==> Parameters: zhangsan(String), true(Boolean), lqf(String)
   * <==  Updates: 100
   * Closing non transactional SqlSession [org.apache.ibatis.session.defaults.DefaultSqlSession@56a4f272]
   * 100
   * 2018-10-02 15:08:03.928 INFO 7972 --- [    Thread-2] o.s.w.c.s.GenericWebApplicationContext  : Closing org.springframework.web.context.support.GenericWebApplicationContext@37313c65: startup date [Tue Oct 02 15:08:00 CST 2018]; root of context hierarchy
   * 2018-10-02 15:08:03.937 INFO 7972 --- [    Thread-2] com.zaxxer.hikari.HikariDataSource    : HikariPool-1 - Shutdown initiated...
   * 2018-10-02 15:08:04.053 INFO 7972 --- [    Thread-2] com.zaxxer.hikari.HikariDataSource    : HikariPool-1 - Shutdown completed.
   *
   * Process finished with exit code 0
   */

}