1.配置
- jdk8（jdk1.7以上均可）
- Maven 3.6.3
- MySQL 5.5 （mysql5.6以上均可）
- 官网文档： https://mybatis.org/mybatis-3/zh/getting-started.html
配置pom文档
<?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>mybatis-01</module> </modules> <!-- 导入依赖--> <dependencies> <dependency> <!-- 导入数据库依赖--> <groupId>mysql</groupId> <artifactId>mysql-connector-java</artifactId> <version>5.1.49</version> </dependency> <!-- 导入Mybatis依赖--> <dependency> <groupId>org.mybatis</groupId> <artifactId>mybatis</artifactId> <version>3.5.2</version> </dependency> <!-- 导入Junit依赖--> <dependency> <groupId>junit</groupId> <artifactId>junit</artifactId> <version>4.12</version> </dependency> </dependencies> <!-- maven无奈读取src目录下的配置文件，退出上面代码保障maven能读取到Usermapper.xmi--> <build> <resources> <resource> <directory>src/main/resources</directory> <includes> <include>**/*.properties</include> <include>**/*.xml</include> </includes> <filtering>true</filtering> </resource> <resource> <directory>src/main/java</directory> <includes> <include>**/*.properties</include> <include>**/*.xml</include> </includes> <filtering>true</filtering> </resource> </resources> </build></project>2.连贯数据库
在resources下创立一个叫mybatis-config.xml文件
<?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><environments default="development"><environment id="development"><transactionManager type="JDBC"/><dataSource type="POOLED"><property name="driver" value="com.mysql.jdbc.Driver"/><property name="url" value="jdbc:mysql://localhost:3306/mybaits?useSSL=true&useUnicode=true&characterEncoding=UTF-8&serverTimezone=GMT"/><property name="username" value="root"/><property name="password" value="root"/></dataSource></environment></environments><mappers><mapper resource="com/kuang/dao/UserMapper.xml"/></mappers></configuration>留神：手动连贯数据库可能呈现时区不对的状况
在url3306前面退出/?serverTimezone=GMT即可
3.创立类和接口，编写代码
3.1 mybatisUtils类
package com.kuang.utils;import org.apache.ibatis.io.Resources;import org.apache.ibatis.jdbc.SQL;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 { String resource = "mybatis-config.xml"; InputStream inputStream = Resources.getResourceAsStream(resource); sqlSessionFactory = new SqlSessionFactoryBuilder().build(inputStream); } catch (IOException e) { e.printStackTrace(); } } // 既然有了 SqlSessionFactory，顾名思义，咱们能够从中取得 SqlSession 的实例。org.apache.ibatis.session.SqlSession 提供了在数据库执行 SQL 命令所需的所有办法。你能够通过 SqlSession 实例来间接执行已映射的 SQL 语句。 public static SqlSession getSqlSession(){ return sqlSessionFactory.openSession(); }}3.2实体类
package com.kuang.pojo;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 + ''' + '}'; }}3.3接口
package com.kuang.dao;import com.kuang.pojo.User;import java.util.List;public interface UserDao { List<User>getUserList();}3.4 接口实现类（写在xml文件中）
<?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.kuang.dao.UserDao"> <select id="getUserList" resultType="com.kuang.pojo.User"> select * from mybaits.user; </select></mapper>每一个xml文件都须要在mybatis-config的mappers中配置
<mappers> <mapper resource="com/kuang/dao/UserMapper.xml"/></mappers>#### 3.5测试类package com.kuang.dao;
import com.kuang.pojo.User;
import com.kuang.utils.MybatisUtils;
import org.apache.ibatis.session.SqlSession;
import org.junit.Test;
import java.util.List;
public class UserDaoTest {
@Test
public void test(){
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();
}
}
## 4.测试后果附数据库语句