springboot: mybatis的使用

2019年10月27日 130次阅读来源: MyBatis

第一步：引入mybatis依赖

            <dependency>
            <groupId>org.mybatis.spring.boot</groupId>
            <artifactId>mybatis-spring-boot-starter</artifactId>
            <version>1.3.0</version>
        </dependency>

第二步：类目表实体类

package com.payease.dataobject;

import lombok.Data;
import org.hibernate.annotations.DynamicUpdate;

import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.Id;

/**
 * 类目
 * Created by liuxiaoming
 * 2017-11-09
 */
@Entity
@DynamicUpdate   //动态时间修改
@Data            // get set toString 登方法
public class ProductCategory {

    /** 类目id. */
    @Id
    @GeneratedValue
    private Integer categoryId;

    /** 类目名字. */
    private String categoryName;

    /** 类目编号. */
    private Integer categoryType;

//    private Date createTime;
//
//    private Date updateTime;




    public ProductCategory() {
    }

    public ProductCategory(String categoryName, Integer categoryType) {
        this.categoryName = categoryName;
        this.categoryType = categoryType;
    }
}

第三步：编写相应的mapper文件

package com.payease.dataobject.mapper;


import com.payease.dataobject.ProductCategory;
import org.apache.ibatis.annotations.*;

import java.util.List;
import java.util.Map;

/**
 * @Created By liuxiaoming
 * @CreateTime 2017/12/12 下午6:13
 **/

public interface ProductCategoryMapper {

    /**
     * 通过参数为map保存
     * @param map
     * @return
     */
    @Insert("insert into product_category(category_name, category_type) values (#{category_name , jdbcType=VARCHAR}, #{category_type, jdbcType=INTEGER})")
    int insertByMap(Map<String, Object> map);

    /**
     * 通过参数为对象保存
     * @param productCategory
     * @return
     */
    @Insert("insert into product_category(category_name, category_type) values (#{categoryName , jdbcType=VARCHAR}, #{categoryType, jdbcType=INTEGER})")
    int insertByObject(ProductCategory productCategory);


    /**
     * 查单一数据
     * 通过categoryType查询product_category表 @Result注解设置返回值
     * @param categoryType
     * @return
     */
    @Select("select * from product_category where category_type = #{categoryType}")
    @Results({
            @Result(column = "category_id", property = "categoryId"),
            @Result(column = "category_name", property = "categoryName"),
            @Result(column = "category_type", property = "categoryType")
    })
    ProductCategory findByCategoryType(Integer categoryType);

    /**
     * 查集合
     * 通过categoryName查询product_category表 @Result注解设置返回值
     * @param categoryName
     * @return
     */
    @Select("select * from product_category where category_name = #{categoryName}")
    @Results({
            @Result(column = "category_id", property = "categoryId"),
            @Result(column = "category_name", property = "categoryName"),
            @Result(column = "category_type", property = "categoryType")
    })
    List<ProductCategory> findByCategoryName(String categoryName);

    /**
     * 根据某个字段更新
     * 通过查询category_type 来修改 category_name
     * @param categoryName
     * @param categoryType
     * @return
     */
    @Update("update product_category set category_name = #{categoryName} where category_type = #{categoryType}")
    int updateByCategoryType(@Param("categoryName") String categoryName,
                             @Param("categoryType") Integer categoryType);

    /**
     * 根据对象更新
     * 通过查询category_type 来修改 category_name
     * @param productCategory
     * @return
     */
    @Update("update product_category set category_name = #{categorName} where category_type = #{categoryType}")
    int updateByObject(ProductCategory productCategory);

    /**
     * 根据某个字段来删除数据
     * 通过category_type 来删除数据
     * @param categoryType
     * @return
     */
    @Delete("delete from product_category where category_type = #{categoryType}")
    int deleteByCategoryType(Integer categoryType);

    /**
     * mybatis xml的使用样例
     * 通过categoryType 查询数据
     * @param categoryType
     * @return
     */
    ProductCategory selectByCategoryType(Integer categoryType);
}

第四步：测试类的编写

package com.payease.dataobject.mapper;

import com.payease.dataobject.ProductCategory;
import org.junit.Assert;
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.HashMap;
import java.util.List;
import java.util.Map;

/**
 * @Created By liuxiaoming
 * @CreateTime 2017/12/12 下午6:19
 **/
@RunWith(SpringRunner.class)
@SpringBootTest
public class ProductCategoryMapperTest {

    @Autowired
    private ProductCategoryMapper mapper;

    @Test
    public void insertByMap() throws Exception {
        Map<String, Object> map = new HashMap<>();
        map.put("category_name","吃鸡专属");
        map.put("category_type",103);
        int result = mapper.insertByMap(map);
        Assert.assertEquals(1,result);
    }

    @Test
    public void insertByObject() throws Exception {
        ProductCategory productCategory = new ProductCategory();
        productCategory.setCategoryName("大吉大利");
        productCategory.setCategoryType(102);
        int result = mapper.insertByObject(productCategory);
        Assert.assertEquals(1,result);
    }

    @Test
    public void findByCategoryType() throws Exception{
        ProductCategory result = mapper.findByCategoryType(102);
        Assert.assertNotNull(result);
    }

    @Test
    public void findByCategoryName() throws Exception{
        List<ProductCategory> result = mapper.findByCategoryName("吃鸡专属");
        Assert.assertNotEquals(0,result.size());
    }

    @Test
    public void updateByCategoryType(){
        int result = mapper.updateByCategoryType("绝地求生", 103);
        Assert.assertEquals(1, result);
    }

    @Test
    public void updateByObject(){
        ProductCategory productCategory = new ProductCategory();
        productCategory.setCategoryName("今晚吃鸡|大吉大利");
        productCategory.setCategoryType(102);
        int result = mapper.updateByObject(productCategory);
        Assert.assertEquals(1, result);
    }

    @Test
    public void deleteByCategoryType(){
        int result = mapper.deleteByCategoryType(102);
        Assert.assertEquals(1, result);
    }

    @Test
    public void selectByCategoryType(){
        ProductCategory result = mapper.selectByCategoryType(101);
        Assert.assertNotNull(result);
    }


}

第五步：启动类上加入mapper扫描注解

package com.payease;

import org.mybatis.spring.annotation.MapperScan;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication
@MapperScan(basePackages = "com.payease.dataobject.mapper") public class SellApplication {

    public static void main(String[] args) {
        SpringApplication.run(SellApplication.class, args);
    }
}

第六步：对于mybatis xml文件的使用需要

1.在 resource/mapper文件夹下创建相应的xml文件

《springboot: mybatis的使用》

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd" >
<mapper namespace="com.payease.dataobject.mapper.ProductCategoryMapper" >
  <resultMap id="BaseResultMap" type="com.payease.dataobject.ProductCategory" >
    <id column="category_id" property="categoryId" jdbcType="INTEGER" />
    <result column="category_name" property="categoryName" jdbcType="VARCHAR" />
    <result column="category_type" property="categoryType" jdbcType="INTEGER" />
    <result column="create_time" property="createTime" jdbcType="TIMESTAMP" />
    <result column="update_time" property="updateTime" jdbcType="TIMESTAMP" />
  </resultMap>

  <sql id="base_column" >
      category_id,category_name,category_type
  </sql>
  <select id="selectByCategoryType" resultMap="BaseResultMap" parameterType="java.lang.Integer" >
    select <include refid="base_column" />
    from product_category
    where category_type = #{category_type,jdbcType=INTEGER}
  </select>

</mapper>

2.在application.yml文件夹下配置xml文件的扫描

《springboot: mybatis的使用》

注1： mapper文件的使用封装到dao层

package com.payease.dataobject.dao;

import com.payease.dataobject.mapper.ProductCategoryMapper;
import org.springframework.beans.factory.annotation.Autowired;

import java.util.Map;

/**
 * @Created By liuxiaoming
 * @CreateTime 2017/12/13 下午3:23
 **/
public class ProductCategoryDao {

    @Autowired
    ProductCategoryMapper mapper;

    public int insertByMap(Map<String, Object> map){
        return mapper.insertByMap(map);
    }
}

注2：日志查看mapper文件中的SQL语句

《springboot: mybatis的使用》

这是application.yml文件的配置

spring:
  datasource:
    driver-class-name: com.mysql.jdbc.Driver
    username: root
    password: liuxiaoming_123 #1234
    url: jdbc:mysql://rm-uf6qe0894f7hv8977o.mysql.rds.aliyuncs.com/sell?characterEncoding=utf-8&useSSL=false
    #url: jdbc:mysql://127.0.0.1/sell?characterEncoding=utf-8&useSSL=false
  jpa:
    show-sql: true
  jackson:
    default-property-inclusion: non_null
  redis:
    host: 192.168.1.183
    port: 6379
server:
  context-path: /sell
#logging:
#  pattern:
#    console: "%d - %msg%n"  #日志格式 日期 - 信息 空格
#  path: /Users/liuxiaoming/Documents/ideawork/sell_log #日志路径 默认名字spring.log
#  file: /Users/liuxiaoming/Documents/ideawork/sell_log/sell.log #日志文件+路径
#  level:  #日志级别
#    com.payease.LoggerTest: debug #日志级别指定某个类 也可以步制定类 直接在level： 后面配置

#日志查看SQL语句 logging: level: com.payease.dataobject.mapper: trace 
wechat:
  mpAppId: wxd898fcb01713c658
  mpAppSecret: 47ccc303338cee6e62894fxxxxxxxxxxx
  openAppId: wx6ad144e54af67d87
  openAppSecret: 91a2ff6d38a2bbccfb7e9f9079108e2e
  mchId: 1483469312
  mchKey: 06C56A89949D617xxxxxxxxxxx
  keyPath: /var/weixin_cert/h5.p12
  notifyUrl: http://sell.natapp4.cc/sell/pay/notify
  templateId:
    orderStatus: e-Cqq67QxD6YNI41iRiqawEYdFavW_7pc7LyEMb-yeQ

#projectUrl:
#  wechatMpAuthorize: http://sell.natapp4.cc
#  wechatOpenAuthorize: http://sell.natapp4.cc
#  sell: http://sell.natapp4.cc
projectUrl:
  wechatMpAuthorize: http://127.0.0.1:8080
  wechatOpenAuthorize: http://127.0.0.1:8080
  sell: http://127.0.0.1:8080

    原文作者：MyBatis
    原文地址: https://www.cnblogs.com/liuxiaoming123/p/8033635.html
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