product.sql

create table products
(product_id       int auto_increment comment '产品ID'primary key,product_name     varchar(100)   null comment '产品名称',brand            varchar(50)    null comment '品牌',price            decimal(10, 2) null comment '价格',color            varchar(20)    null comment '颜色',storage_capacity varchar(10)    null comment '存储容量',description      text           null comment '描述'
)comment '手机产品表';

pom.xml

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"><modelVersion>4.0.0</modelVersion><groupId>com.aistat</groupId><artifactId>mybatis_tech</artifactId><version>1.0-SNAPSHOT</version><!--打包类型--><packaging>jar</packaging><properties><maven.compiler.source>8</maven.compiler.source><maven.compiler.target>8</maven.compiler.target><project.build.sourceEncoding>UTF-8</project.build.sourceEncoding></properties><!--所有依赖--><dependencies><!--        MySQL驱动--><dependency><groupId>com.mysql</groupId><artifactId>mysql-connector-j</artifactId><version>8.0.31</version></dependency><!--        mybatis依赖--><dependency><groupId>org.mybatis</groupId><artifactId>mybatis</artifactId><version>3.5.15</version></dependency><!--测试环境--><dependency><groupId>junit</groupId><artifactId>junit</artifactId><version>4.13.2</version><scope>test</scope></dependency></dependencies></project>

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><settings><setting name="mapUnderscoreToCamelCase" value="true"/></settings><environments default="development"><environment id="development"><transactionManager type="JDBC"/><dataSource type="POOLED"><property name="driver" value="com.mysql.cj.jdbc.Driver"/><property name="url" value="jdbc:mysql://localhost:3306/dict"/><property name="username" value="root"/><property name="password" value="123456"/></dataSource></environment></environments><mappers><mapper resource="mapper/ProductsMapper.xml"></mapper></mappers>
</configuration>

mapper.ProductsMapper.xml

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapperPUBLIC "-//mybatis.org//DTD Mapper 3.0//EN""http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="mapper.ProductsMapper"><!--id作为这个sql的唯一id,调用也是通过它--><insert id="insertOne" parameterType="com.aistart.tech.pojo.Products">insert into products (product_name,color,price)values (#{productName},#{color},#{price})</insert><select id="selectOneById" parameterType="int" resultType="com.aistart.tech.pojo.Products">select * from products where product_id = #{id}</select>
</mapper>

pojo.products.java

package com.aistart.tech.pojo;public class Products {private Integer productId;private String productName;private String brand;private double price;private String color;private String storageCapacity;private String description;public Integer getProductId() {return productId;}public void setProductId(Integer productId) {this.productId = productId;}public String getProductName() {return productName;}public void setProductName(String productName) {this.productName = productName;}public String getBrand() {return brand;}public void setBrand(String brand) {this.brand = brand;}public double getPrice() {return price;}public void setPrice(double price) {this.price = price;}public String getColor() {return color;}public void setColor(String color) {this.color = color;}public String getStorageCapacity() {return storageCapacity;}public void setStorageCapacity(String storageCapacity) {this.storageCapacity = storageCapacity;}public String getDescription() {return description;}public void setDescription(String description) {this.description = description;}}

utils.DButil.java

package com.aistart.tech.utils;import org.apache.ibatis.io.Resources;
import org.apache.ibatis.session.SqlSession;
import org.apache.ibatis.session.SqlSessionFactory;
import org.apache.ibatis.session.SqlSessionFactoryBuilder;import java.io.IOException;
import java.io.InputStream;public class DButil {private static SqlSessionFactory sqlSessionFactory = null;static {//1.builder  一旦创建了 SqlSessionFactory，就不再需要它了
//        SqlSessionFactoryBuilder sqlSessionFactoryBuilder =//2.获取工厂// 获取资源 org.apache.ibatis.io.Resources;try {InputStream inputStream = Resources.getResourceAsStream("mybatis-config.xml");//根据资源文件创建工厂sqlSessionFactory  = new SqlSessionFactoryBuilder().build(inputStream);} catch (IOException e) {throw new RuntimeException(e);}}public static SqlSession getSqlSession(){//获得Sqlsessionreturn sqlSessionFactory.openSession();}public static void close(SqlSession session){session.close();}}

mapper.impl.ProductsMapperImpl.java

package com.aistart.tech.mapper.impl;import com.aistart.tech.mapper.ProductsMapper;
import com.aistart.tech.pojo.Products;
import com.aistart.tech.utils.DButil;
import org.apache.ibatis.session.SqlSession;public class ProductsMapperImpl implements ProductsMapper {@Overridepublic int insertOne(Products products) {SqlSession sqlSession = DButil.getSqlSession();System.out.println(products.getProductName());int rows = sqlSession.insert("insertOne",products );sqlSession.commit();//关闭掉sqlSession.close();return rows;}@Overridepublic Products selectOneById(int id) {SqlSession sqlSession = DButil.getSqlSession();Products one =(Products) sqlSession.selectOne("selectOneById", id);sqlSession.close();return one;}
}

test

package com.aistart.tech.mapper.impl;import com.aistart.tech.mapper.ProductsMapper;
import com.aistart.tech.pojo.Products;
import org.junit.Test;public class ProductsMapperImplTest {ProductsMapper mapper = new ProductsMapperImpl();@Testpublic void test(){Products products = mapper.selectOneById(1);System.out.println(products);products.setProductName("小米");products.setColor("红色");products.setPrice(200);System.out.println(products.getProductName());int rows = mapper.insertOne(products);System.out.println(rows);}
}