mybatis初次嘗試

記錄一下本身學習mybatis的過程

　　整個工程項目目錄以下：

　　

　　pom.xml配置以下：

　　

<?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>lpp</groupId>
    <artifactId>mybatisTest</artifactId>
    <version>1.0-SNAPSHOT</version>

    <dependencies>
        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis</artifactId>
            <version>3.1.1</version>
        </dependency>

        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>5.1.38</version>
        </dependency>

        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.11</version>
            <scope>test</scope>
        </dependency>

    </dependencies>

</project>

　　

　　mybatis的配置文件以下：

<!DOCTYPE configuration
        PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
        "http://mybatis.org/dtd/mybatis-3-config.dtd">
<configuration>
    <typeAliases>
        <typeAlias type="com.lpp.test.po.Car" alias="car"/>
    </typeAliases>
    <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/test"/>
                <property name="username" value="root"/>
                <property name="password" value=""/>
            </dataSource>
        </environment>
    </environments>
    <mappers>
        <mapper resource="config/SqlMapper/CarMapper.xml"/>
    </mappers>
</configuration>

 

建立一個實體類，car.java

package com.lpp.test.po;

/**
 * Created with IntelliJ IDEA.
 * Description:
 * User: lpp
 * Date: 2018-04-16
 * Time: 11:06
 */
public class Car {
    int id;
    String car_name;
    int maxSpeed;

    public Car() {
    }

    public Car(int id, String carName, int maxSpeed) {
        this.id = id;
        this.car_name = car_name;
        this.maxSpeed = maxSpeed;
    }

    public int getId() {
        return id;
    }

    public String getCar_name() {
        return car_name;
    }

    public int getMaxSpeed() {
        return maxSpeed;
    }

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

    public void setName(String car_name) {
        this.car_name = car_name;
    }

    public void setMaxSpeed(int maxSpeed) {
        this.maxSpeed = maxSpeed;
    }

    @Override
    public String toString() {
        return "Car{" +
                "id=" + id +
                ", name='" + car_name + '\'' +
                ", maxSpeed=" + maxSpeed +
                '}';
    }
}

 

建立carMapper.xml

<?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.lpp.test.impl.carMapper">
    <select id="findCarbyId" parameterType="int" resultType="Car">
        SELECT * FROM t_car WHERE id = #{id}
    </select>
    <select id="findCarbyIdAndName" resultType="Car">
        SELECT * FROM t_car WHERE id = #{id} AND car_name = #{car_name};
    </select>
    <select id="findCarbyIdAndSpeed" resultType="Car">
        SELECT * FROM t_car WHERE id = #{id} AND maxSpeed = #{maxSpeed};
    </select>
</mapper>

 

建立carMapper接口 carMapper.java

package com.lpp.test.impl;

import com.lpp.test.po.Car;
import org.apache.ibatis.annotations.Param;
import org.apache.ibatis.annotations.Select;

/**
 * Created with IntelliJ IDEA.
 * Description:
 * User: lpp
 * Date: 2018-04-17
 * Time: 19:44
 */
public interface carMapper {
    public Car findCarbyId(int id);
    public Car findCarbyIdAndName(@Param("id") int id, @Param("car_name") String car_name);
    //@Select("SELECT * FROM t_car WHERE id = #{id} AND maxSpeed = #{maxSpeed}")
    public Car findCarbyIdAndSpeed(Car car);
}

前期工做已經完成了。如今建立測試類

CarDaoImplTest.java

package com.lpp.test;

import com.lpp.test.impl.carMapper;
import com.lpp.test.po.Car;
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 org.junit.Before;
import org.junit.Test;

import java.io.IOException;
import java.io.InputStream;

/**
 * Created with IntelliJ IDEA.
 * Description:
 * User: lpp
 * Date: 2018-04-16
 * Time: 11:21
 */
public class CarDaoImplTest {

    private SqlSessionFactory sqlSessionFactory;

    @Before
    public void init() throws IOException {
        String resource = "config/SqlMapConfig.xml";
        InputStream inputStream = Resources.getResourceAsStream(resource);
        sqlSessionFactory = new SqlSessionFactoryBuilder().build(inputStream);
    }

    @Test
    public void testFindUserById(){
        SqlSession sqlSession = sqlSessionFactory.openSession();
        Car car = null;
        Car car1 = new Car();
        try {
            //car = sqlSession.selectOne("test.findCarbyId",1);
            carMapper carMapper = sqlSession.getMapper(carMapper.class);
            //car = carMapper.findCarbyId(1);
            //car = carMapper.findCarbyIdAndName(1,"aodi");
            car1.setId(1);
            //car1.setName("aodi");
            car1.setMaxSpeed(280);
            car = carMapper.findCarbyIdAndSpeed(car1);
        }catch (Exception e){
            e.printStackTrace();
        }finally {
            sqlSession.close();
        }
        System.out.println(car);

    }
}

右擊運行測試，獲得結果

 查詢出數據 大功告成。

最後附上gitee的地址：https://gitee.com/LL7_s/personal_test_code_sorting/tree/master/mybatisTest

能夠自行查閱。新手上路，請各位多多關照。