maven搭建mybatis测试

使用maven搭建项目，pom文件导包如下：

<?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.zs</groupId>
    <artifactId>mybatis</artifactId>
    <version>1.0-SNAPSHOT</version>

    <dependencies>
        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis</artifactId>
            <version>3.4.6</version>
        </dependency>
        <dependency>
            <groupId>com.mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>5.1.45-bin</version>
        </dependency>
    </dependencies>

</project>

导入mybatis核心包后，创建实体类：

package com.zs.entity;

public class Login {
    private int id;
    private String username;
    private String password;

    public int getId() {
        return id;
    }

    public void setId(int id) {
        this.id = id;
    }

    public String getUsername() {
        return username;
    }

    public void setUsername(String username) {
        this.username = username;
    }

    public String getPassword() {
        return password;
    }

    public void setPassword(String password) {
        this.password = password;
    }

    @Override
    public String toString() {
        return "Login{" +
                "id=" + id +
                ", username='" + username + '\'' +
                ", password='" + password + '\'' +
                '}';
    }
}

创建dao层接口：

ackage com.zs.dao;

import com.zs.entity.Login;

/**
 * 创建登录的接口
 */
public interface LoginDao {
    /**
     * 查询根据id查询用户信息
     */
    Login getById(int id);

}

创建mybatis基础配置文件：

<?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="mysql">
        <environment id="mysql">
            <transactionManager type="JDBC"></transactionManager>
            <!--配置mybatis连接数据库的连接池信息-->
            <dataSource type="POOLED">
                <!--配置数据库基本信息-->
                <property name="driver" value="com.mysql.jdbc.Driver"/>
                <property name="url" value="jdbc:mysql://localhost:3306/mybase?characterEncoding=utf-8"/>
                <property name="username" value="root"/>
                <property name="password" value="123456"/>
            </dataSource>
        </environment>
    </environments>
    <!--将项目的mappper文件配置进来-->
    <mappers>
        <mapper resource="mapper/login.xml"/>
    </mappers>
</configuration>

mapper文件如下：

<!DOCTYPE mapper PUBLIC "-//mybatis.org// Mapper 3.0//EN"
        "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="com.zs.dao.LoginDao">
    <select id="getById" resultType="com.zs.entity.Login">
        select * from login where id=#{id}
    </select>
</mapper>

然后创建一个工具类，因为需要读取xml文件的配置信息连接数据库，就像之前的链接数据库创建工具类一样，这里也创建工具类：

package com.zs.util;

import com.sun.deploy.util.SessionProperties;
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 SqlSessionUtil {
    private static SqlSessionFactory sessionFactory;
    static {
        InputStream in = null;
        try {
            in = Resources.getResourceAsStream("mybatis-config.xml");
            sessionFactory=new SqlSessionFactoryBuilder().build(in);
        } catch (IOException e) {
            e.printStackTrace();
        }finally {
            try {
                in.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }

    public static SqlSession getSession(){
        return sessionFactory.openSession();
    }
}

进行测试：

import com.zs.dao.LoginDao;
import com.zs.entity.Login;
import com.zs.util.SqlSessionUtil;
import org.apache.ibatis.session.SqlSession;

public class loginTest {
    public static void main(String[] args) {
        SqlSession session = SqlSessionUtil.getSession();
        LoginDao mapper = session.getMapper(LoginDao.class);
        Login byId = mapper.getById(1);
        System.out.println(byId);
    }
}

结果如下：