文章目录

MyBatis实现增删改查功能（总）
- 一、创建数据库、表、数据
- 二、MyBatis的Maven项目创建
- 三、MyBatis的Maven模块创建
- 四、配置jar包pom.xml
- 五、MyBatis的项目结构
- 六、创建 jdbc.properties
- 七、创建 mybatis-config.xml
- 八、创建utils包 SqlSession工具类
- 九、创建pojo包的Supermarket类
- 十、创建mapper包接口方法 SupermarketMapper
- 十一、创建mapper资源映射文件 SupermarketMapper
- 十二、创建测试类

MyBatis实现增删改查功能（总）

单增加，且获取自增的主键
批量增加
单删除
批量删除
单修改
单查询
全部查询
一到八（MyBatis工程配置）

一、创建数据库、表、数据

CREATE DATABASE USE `ssm`;DROP TABLE IF EXISTS `t_supermarket`;CREATE TABLE `t_supermarket` (`id` int NOT NULL AUTO_INCREMENT COMMENT '商品id',`name` varchar(50) COMMENT '商品名称',`price` double  COMMENT '商品价格',`address` varchar(100) COMMENT '商品产地',`quality_guarantee_period` varchar(30) COMMENT '商品的保质期',PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=12 DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci;insert  into `t_supermarket`(`id`,`name`,`price`,`address`,`quality_guarantee_period`) values
(1,'可乐',3,'合肥','6个月'),
(2,'雪碧',3,'合肥','6个月'),
(3,'巧克力',8,'南京','10个月'),
(4,'曲奇饼干',16,'北京','12个月'),
(5,'卫龙辣条',3,'上海','6个月'),
(6,'康师傅葱香排骨面',5,'上海','6个月'),
(7,'大鸡腿',8,'杭州','10个月'),
(8,'卤蛋',2,'深圳','6个月'),
(9,'泡椒凤爪',2,'合肥','6个月'),
(10,'火腿肠',1.5,'合肥','6个月');

二、MyBatis的Maven项目创建

三、MyBatis的Maven模块创建

四、配置jar包pom.xml

    <dependencies><dependency><!--junit测试--><groupId>junit</groupId><artifactId>junit</artifactId><version>4.13.2</version></dependency><!--mysql--><dependency><groupId>mysql</groupId><artifactId>mysql-connector-java</artifactId><version>8.0.29</version></dependency><!--mybatis--><dependency><groupId>org.mybatis</groupId><artifactId>mybatis</artifactId><version>3.5.10</version></dependency></dependencies>

五、MyBatis的项目结构

六、创建 jdbc.properties

jdbc.driver=com.mysql.cj.jdbc.Driver
jdbc.url=jdbc:mysql://localhost:3306/ssm?&useUnicode=true&characterEncoding=utf8&serverTimezone=Asia/Shanghai
jdbc.username=root
jdbc.password=111111

七、创建 mybatis-config.xml

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE configurationPUBLIC "-//mybatis.org//DTD Config 3.0//EN""http://mybatis.org/dtd/mybatis-3-config.dtd">
<configuration><!--MYBatis核心配置文件中的标签必须要按照指定的顺序去配置properties?,settings?,typeAliases?,typeHandlers?,objectFactory?,objectWrapperFactory?,reflectorFactory?,plugins?,environments?,databaseIdProvider?,mappers?--><!--引入 properties 文件--><properties resource="jdbc.properties"/><!--全局设置--><settings><!--日志--><setting name="logImpl" value="STDOUT_LOGGING"/><!--将下划线映射为驼峰--><setting name="mapUnderscoreToCamelCase" value="true"/><!--开启延迟加载--><setting name="lazyLoadingEnabled" value="true"/><!--按需加载，它要与延迟加载配合的，默认就是false，可以不写这段代码，但是最好写上--><setting name="aggressiveLazyLoading" value="false"/></settings><!--设置类型别名--><typeAliases><!--通过包来设置类型别名，指定包下所有的类型，将全部拥有默认的别名--><package name="com.sgz.mybatis.pojo"/></typeAliases><!--连接数据库--><environments default="development"><environment id="development"><transactionManager type="JDBC"/><dataSource type="POOLED"><property name="driver" value="${jdbc.driver}"/><property name="url"value="${jdbc.url}"/><property name="username" value="${jdbc.username}"/><property name="password" value="${jdbc.password}"/></dataSource></environment></environments><!--引入mybatis的映射文件--><mappers><package name="com.sgz.mybatis.mapper"/></mappers></configuration>

八、创建utils包 SqlSession工具类

public class SqlSessionUtil {public static SqlSession getSqlSession() {SqlSession sqlSession = null;try {InputStream inputStream = Resources.getResourceAsStream("mybatis-config.xml");SqlSessionFactoryBuilder builder = new SqlSessionFactoryBuilder();SqlSessionFactory build = builder.build(inputStream);sqlSession = build.openSession(true);} catch (IOException e) {e.printStackTrace();}return sqlSession;}
}

九、创建pojo包的Supermarket类

public class Supermarket {private Integer id;private String name;private Double price;private String address;private String quality_guarantee_period;public Supermarket() {}public Supermarket(Integer id, String name, Double price, String address, String quality_guarantee_period) {this.id = id;this.name = name;this.price = price;this.address = address;this.quality_guarantee_period = quality_guarantee_period;}public Integer getId() {return id;}public void setId(Integer id) {this.id = id;}public String getName() {return name;}public void setName(String name) {this.name = name;}public Double getPrice() {return price;}public void setPrice(Double price) {this.price = price;}public String getAddress() {return address;}public void setAddress(String address) {this.address = address;}public String getQuality_guarantee_period() {return quality_guarantee_period;}public void setQuality_guarantee_period(String quality_guarantee_period) {this.quality_guarantee_period = quality_guarantee_period;}@Overridepublic String toString() {return "Supermarket{" +"id=" + id +", name='" + name + '\'' +", price=" + price +", address='" + address + '\'' +", quality_guarantee_period='" + quality_guarantee_period + '\'' +'}';}
}

十、创建mapper包接口方法 SupermarketMapper

public interface SupermarketMapper {/*** 通过实体类，并获取自增的主键，添加商品（单）** @param supermarket*/void insertGoods(Supermarket supermarket);/*** 通过id，删除商品（单）** @param id*/void deleteGoods(@Param("id") Integer id);/*** 通过实体类，修改商品（单）* @param supermarket*/void updateGoods(Supermarket supermarket);/*** 通过id查询商品（单）* @param id* @return*/Supermarket selectGoodsById(@Param("id") Integer id);/*** 查询全部商品（全部）* @return*/List<Supermarket> selectAllGoods();/*** 批量删除商品（批量）* @param ids*/void deleteMoreGoods(@Param("ids") Integer[] ids);/*** 批量添加商品（批量）* @param supermarketList*/void insertMoreGoods(@Param("lists") List<Supermarket> supermarketList);}

十一、创建mapper资源映射文件 SupermarketMapper

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapperPUBLIC "-//mybatis.org//DTD Mapper 3.0//EN""http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<!--对应接口的全类名-->
<mapper namespace="com.sgz.mybatis.mapper.SupermarketMapper"><!--void insertGoods(Supermarket supermarket);--><insert id="insertGoods" useGeneratedKeys="true" keyProperty="id">insert into t_supermarketvalues (null, #{name}, #{price}, #{address}, #{qualityGuaranteePeriod});</insert><!--void deleteGoods(@Param("id") Integer id);--><delete id="deleteGoods">deletefrom t_supermarketwhere id = ${id};</delete><!-- void updateGoods(Supermarket supermarket);--><update id="updateGoods">update t_supermarketset name                     = #{name},price                    = #{price},address                  = #{address},quality_guarantee_period = #{qualityGuaranteePeriod}where id = #{id}</update><!--Supermarket selectGoodsById(@Param("id") Integer id);--><select id="selectGoodsById" resultType="Supermarket">select *from t_supermarketwhere id = #{id}</select><!--List<Supermarket> selectAllGoods();--><select id="selectAllGoods" resultType="Supermarket">select *from t_supermarket</select><!-- void deleteMoreGoods(@Param("ids") Integer[] ids);--><delete id="deleteMoreGoods">delete from t_supermarket where id in(<foreach collection="ids" item="id" separator=",">#{id}</foreach>)</delete><!--void insertMoreGoods(List<Supermarket> supermarketList);--><insert id="insertMoreGoods">insert into t_supermarketvalues<foreach collection="lists" item="sup" separator=",">(null, #{sup.name}, #{sup.price}, #{sup.address}, #{sup.qualityGuaranteePeriod})</foreach></insert></mapper>

十二、创建测试类

public class TestMybatis {/*** 通过实体类，并获取自增的主键，添加商品（单）*/@Testpublic void testInsertGoods() {SqlSession sqlSession = SqlSessionUtil.getSqlSession();SupermarketMapper mapper = sqlSession.getMapper(SupermarketMapper.class);Supermarket supermarket = new Supermarket(null, "麻辣鸭脖", (double) 5, "合肥", "1个月");mapper.insertGoods(supermarket);System.out.println(supermarket);}/*** 通过id，删除商品（单）*/@Testpublic void testDeleteGoods() {SqlSession sqlSession = SqlSessionUtil.getSqlSession();SupermarketMapper mapper = sqlSession.getMapper(SupermarketMapper.class);mapper.deleteGoods(15);}/*** 通过name，设置实体类，修改商品（单）*/@Testpublic void testUpdateGoods() {SqlSession sqlSession = SqlSessionUtil.getSqlSession();SupermarketMapper mapper = sqlSession.getMapper(SupermarketMapper.class);Supermarket supermarket = new Supermarket(1, "可乐", 3.0, "合肥", "1个月");mapper.updateGoods(supermarket);}/*** 通过id查询商品（单）*/@Testpublic void testSelectGoodsById() {SqlSession sqlSession = SqlSessionUtil.getSqlSession();SupermarketMapper mapper = sqlSession.getMapper(SupermarketMapper.class);Supermarket supermarket = mapper.selectGoodsById(2);System.out.println(supermarket);}/*** 查询全部商品（全部）*/@Testpublic void testSelectAllGoods() {SqlSession sqlSession = SqlSessionUtil.getSqlSession();SupermarketMapper mapper = sqlSession.getMapper(SupermarketMapper.class);List<Supermarket> supermarkets = mapper.selectAllGoods();supermarkets.forEach(System.out::println);}/*** 批量删除（批量）*/@Testpublic void testDeleteMoreGoods() {SqlSession sqlSession = SqlSessionUtil.getSqlSession();SupermarketMapper mapper = sqlSession.getMapper(SupermarketMapper.class);Integer[] integers = new Integer[]{4, 5, 6, 8};mapper.deleteMoreGoods(integers);}/*** 批量添加（批量）*/@Testpublic void testInsertMoreGoods() {SqlSession sqlSession = SqlSessionUtil.getSqlSession();SupermarketMapper mapper = sqlSession.getMapper(SupermarketMapper.class);Supermarket supermarket1 = new Supermarket(null,"康师傅葱香排骨面",5.0,"合肥","6个月");Supermarket supermarket2 = new Supermarket(null,"牛肉",10.0,"合肥","6个月");Supermarket supermarket3 = new Supermarket(null,"豆干",2.0,"合肥","6个月");Supermarket supermarket4 = new Supermarket(null,"香肠",5.0,"合肥","6个月");List<Supermarket> supermarkets = Arrays.asList(supermarket1, supermarket2, supermarket3, supermarket4);mapper.insertMoreGoods(supermarkets);}}

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MyBatis实现增删改查功能（总）

文章目录

MyBatis实现增删改查功能（总）

一、创建数据库、表、数据

二、MyBatis的Maven项目创建

三、MyBatis的Maven模块创建

四、配置jar包pom.xml

五、MyBatis的项目结构

六、创建 jdbc.properties

七、创建 mybatis-config.xml

八、创建utils包 SqlSession工具类

九、创建pojo包的Supermarket类

十、创建mapper包接口方法 SupermarketMapper

十一、创建mapper资源映射文件 SupermarketMapper

十二、创建测试类

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