新建工程
idea配置MyBatis 
idea配置MyBatis 删掉src
idea配置MyBatis 创建Module
idea配置MyBatis 在工程中的porn.xml输入以下依赖
<?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>
<!--父工程-->
<groupId>org.example</groupId>
<artifactId>MyBatis_Study</artifactId>
<packaging>pom</packaging>
<version>1.0-SNAPSHOT</version>
<modules>
<module>test01</module>
</modules>
<!--导入依赖-->
<dependencies>
<!--mysql-->
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>5.1.9</version>
</dependency>
<!--mybatis-->
<dependency>
<groupId>org.mybatis</groupId>
<artifactId>mybatis</artifactId>
<version>3.5.1</version>
</dependency>
<!--junit-->
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.12</version>
</dependency>
</dependencies>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<maven.compiler.encoding>UTF-8</maven.compiler.encoding>
<java.version>14</java.version>
<maven.compiler.source>14</maven.compiler.source>
<maven.compiler.target>14</maven.compiler.target>
</properties>
</project>
Module中的porn.xml中输入
<?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">
<parent>
<artifactId>MyBatis_Study</artifactId>
<groupId>org.example</groupId>
<version>1.0-SNAPSHOT</version>
</parent>
<modelVersion>4.0.0</modelVersion>
<groupId>com.shao</groupId>
<artifactId>test01</artifactId>
<build>
<resources>
<resource>
<directory>src/main/resources</directory>
<includes>
<include>**/*.properties</include>
<include>**/*.xml</include>
</includes>
<filtering>false</filtering>
</resource>
<resource>
<directory>src/main/java</directory>
<includes>
<include>**/*.properties</include>
<include>**/*.xml</include>
</includes>
<filtering>false</filtering>
</resource>
</resources>
</build>
</project>
右边MAVEN点击刷新
idea配置MyBatis 在test01/src/main/resources创建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>
<!-- JavaBean类型自动映射扫描包配置 Java类型别名 -->
<typeAliases>
<package name="com.brok1n.web.java.springmvcdemo1.bean"/>
<!--<typeAlias alias="User" type="com.brok1n.web.java.springmvcdemo1.bean.User" />-->
</typeAliases>
<environments default="development">
<!-- 数据库环境 -->
<environment id="development">
<!-- 使用JDBC使用管理 -->
<transactionManager type="JDBC"/>
<!-- 数据源配置 -->
<dataSource type="POOLED">
<property name="driver" value="com.mysql.jdbc.Driver"/>
<property name="url" value="jdbc:mysql://localhost:3306/mybatis?useSSL=true&useUnicode=true&characterEncoding=utf8"/>
<property name="username" value="root"/>
<property name="password" value="333"/>
</dataSource>
</environment>
</environments>
<!-- 映射器 , 每一个mapper.xml都需要在mybatis-config中注册-->
<mappers>
<mapper resource="com/shao/dao/UserMapper.xml"/>
</mappers>
</configuration>
在test01/src/main/java创建三个文件夹dao、pojo、utils
idea配置MyBatis 在utils创建MybatisUtils
package com.shao.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 MybatisUtils {
private static SqlSessionFactory sqlSessionFactory;
static {
try {
//获取SQLSessionFactory
String resoure = "mybatis-config.xml";
InputStream inputStream = Resources.getResourceAsStream(resoure);
sqlSessionFactory = new SqlSessionFactoryBuilder().build(inputStream);
} catch (IOException e) {
e.printStackTrace();
}
}
public static SqlSession getSqlSession(){
return sqlSessionFactory.openSession();
}
}
pojo创建User
package com.test.pojo;
//实体类
public class User {
private int id;
private String name;
private String password;
public User() {
}
public User(int id, String name, String password) {
this.id = id;
this.name = name;
this.password = password;
}
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 String getPassword() {
return password;
}
public void setPassword(String password) {
this.password = password;
}
@Override
public String toString() {
return "User{" +
"id=" + id +
", name='" + name + '\'' +
", password='" + password + '\'' +
'}';
}
}
在DAO中创建UserDao接口和UserMapper.xml
//UserDao
package com.test.dao;
import com.test.pojo.User;
import java.util.List;
public interface UserDao {
List<User> getUserList();
}
<?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">
<!--namespace绑定一个dao/mapper接口 -->
<mapper namespace="com.test.dao.UserDao">
<select id="getUserList" resultType="com.test.pojo.User">
select * from user
</select>
</mapper>
在test/java中创建test/dao.测试
package com.test.dao;
import com.test.pojo.User;
import com.test.utils.MybatisUtils;
import junit.framework.TestCase;
import org.apache.ibatis.session.SqlSession;
import org.junit.Test;
import java.util.List;
public class UserDaoTest extends TestCase {
@Test
public void test(){
//获取SqlSession对象
SqlSession sqlSession = MybatisUtils.getSqlSession();
UserDao userDao = sqlSession.getMapper(UserDao.class);
List<User> userList = userDao.getUserList();
for (User user:userList) {
System.out.println(user);
}
sqlSession.close();
}
}
一些坑
