在這里我先給出項目的目錄結構：

1.創建數據

在MySQL里面創建一個test數據庫，里面有student表，數據如下：

2.創建maven項目并導入相關依賴

maven依賴如下：

#pom.xml <!-- mybatis依賴包 --><dependency><groupId>org.mybatis</groupId><artifactId>mybatis</artifactId><version>3.1.1</version> </dependency><!-- mysql驅動包 --> <dependency><groupId>mysql</groupId><artifactId>mysql-connector-java</artifactId><version>8.0.11</version> </dependency> 復制代碼

3.編寫mybatis核心配置文件

#mybatis-config.xml <?xml version="1.0" encoding="UTF-8" ?> <!DOCTYPE configuration PUBLIC "-//mybatis.org//DTD Config 3.0//EN" "http://mybatis.org/dtd/mybatis-3-config.dtd"> <configuration><environments default="development"><environment id="development"><transactionManager type="JDBC" /><!-- 數據源，存放連接數據庫的信息 --><dataSource type="POOLED"><property name="driver" value="com.mysql.cj.jdbc.Driver" /><property name="url" value="jdbc:mysql://localhost:3306/test?useSSL=false&amp;serverTimezone=GMT" /><property name="username" value="root" /><property name="password" value="123456" /></dataSource></environment></environments><!-- 存放映射文件 --><mappers><mapper resource="com/xgc/entity/user_mapper.xml"/></mappers> </configuration> 復制代碼

4.創建sqlSessionFactory,以及獲得SqlSession

#MyBatisUtil.java package com.xgc.util;import java.io.IOException; import java.io.InputStream;import org.apache.ibatis.io.Resources; import org.apache.ibatis.session.SqlSession; import org.apache.ibatis.session.SqlSessionFactory; import org.apache.ibatis.session.SqlSessionFactoryBuilder;public class MyBatisUtil {public static SqlSessionFactory getSqlSessionFactory() throws IOException {String resource = "mybatis-config.xml";InputStream inputStream=Resources.getResourceAsStream(resource);SqlSessionFactory sqlSessionFactory=new SqlSessionFactoryBuilder().build(inputStream);return sqlSessionFactory;}public static SqlSession getSqlSession() throws IOException {SqlSessionFactory sqlSessionFactory=getSqlSessionFactory();return sqlSessionFactory.openSession();} } 復制代碼

5.創建實體類

#User.java package com.xgc.entity;public class User {private int id;private String name;private int age;public int getId() {return id;}public void setId(int id) {this.id = id;}public String getName() {return name;}public void setName(String name) {this.name = name;}public int getAge() {return age;}public void setAge(int age) {this.age = age;} } 復制代碼

6.編寫sql語句的映射文件

#user_mapper.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="com.xgc.entity.UserMapper"><select id="selectUser" resultType="com.xgc.entity.User">select * from student where id = #{id}</select> </mapper> 復制代碼

7.開始查詢

#Test.java package com.xgc.test;import java.io.IOException;import org.apache.ibatis.session.SqlSession;import com.xgc.entity.User; import com.xgc.util.MyBatisUtil;public class Test {public static void main(String[] args) throws IOException {SqlSession session=MyBatisUtil.getSqlSession();User user=session.selectOne("com.xgc.entity.UserMapper.selectUser", 1);System.out.println("id="+user.getId()+",name="+user.getName()+",age="+user.getAge());session.close();} } 復制代碼

查詢結果為：

轉載于:https://juejin.im/post/5cd0c9316fb9a032453bc2e8

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