springboot整合mybatis使用示例

springboot: mybatis的使用

第一步：引入mybatis依赖

<dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency><groupId>org.mybatis.spring.boot</groupId><artifactId>mybatis-spring-boot-starter</artifactId><version>2.0.0</version>
</dependency>
<dependency><groupId>com.alibaba</groupId><artifactId>druid-spring-boot-starter</artifactId><version>1.1.10</version>
</dependency>
<dependency><groupId>mysql</groupId><artifactId>mysql-connector-java</artifactId><version>5.1.28</version><scope>runtime</scope>
</dependency>
<dependency><groupId>javax.persistence</groupId><artifactId>persistence-api</artifactId><version>1.0</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;/*** @Created By Maynard.ran* @CreateTime 2021/07/05 下午6:13**/@Entity
@DynamicUpdate   //动态时间修改
@Data            // get set toString 登方法
public class ProductCategory {/** 类目id. */@Id@GeneratedValueprivate 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 Maynard.ran* @CreateTime 2021/07/05 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 Maynard.ran* @CreateTime 2021/07/05 下午6:13**/
@RunWith(SpringRunner.class)
@SpringBootTest
public class ProductCategoryMapperTest {@Autowiredprivate ProductCategoryMapper mapper;@Testpublic 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);}@Testpublic 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);}@Testpublic void findByCategoryType() throws Exception{ProductCategory result = mapper.findByCategoryType(102);Assert.assertNotNull(result);}@Testpublic void findByCategoryName() throws Exception{List<ProductCategory> result = mapper.findByCategoryName("吃鸡专属");Assert.assertNotEquals(0,result.size());}@Testpublic void updateByCategoryType(){int result = mapper.updateByCategoryType("绝地求生", 103);Assert.assertEquals(1, result);}@Testpublic 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);}@Testpublic void deleteByCategoryType(){int result = mapper.deleteByCategoryType(102);Assert.assertEquals(1, result);}@Testpublic 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

<?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_categorywhere category_type = #{category_type,jdbcType=INTEGER}</select></mapper>

2.在application.yml文件夹下配置xml文件的扫描

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 Maynard.ran* @CreateTime 2021/07/05 下午6:13**/
public class ProductCategoryDao {@AutowiredProductCategoryMapper 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

这是application.yml文件的配置

spring:datasource:driver-class-name: com.mysql.jdbc.Driverusername: rootpassword: liuxiaoming_123 #1234url: 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=falsejpa:show-sql: truejackson:default-property-inclusion: non_nullredis:host: 192.168.1.183port: 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: tracewechat:mpAppId: wxd898fcb01713c658mpAppSecret: 47ccc303338cee6e62894fxxxxxxxxxxxopenAppId: wx6ad144e54af67d87openAppSecret: 91a2ff6d38a2bbccfb7e9f9079108e2emchId: 1483469312mchKey: 06C56A89949D617xxxxxxxxxxxkeyPath: /var/weixin_cert/h5.p12notifyUrl: http://sell.natapp4.cc/sell/pay/notifytemplateId:orderStatus: e-Cqq67QxD6YNI41iRiqawEYdFavW_7pc7LyEMb-yeQ#projectUrl:
#  wechatMpAuthorize: http://sell.natapp4.cc
#  wechatOpenAuthorize: http://sell.natapp4.cc
#  sell: http://sell.natapp4.cc
projectUrl:wechatMpAuthorize: http://127.0.0.1:8080wechatOpenAuthorize: http://127.0.0.1:8080sell: http://127.0.0.1:8080

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