初识mybatis之入门案例

我也是自学了一下，在idea中基于maven的mybatis的配置。有什么不对的地方，请指正，谢谢。

1.1咋们先来配置测试一下，配置mybatis的图解：

1.2 pom.xml需要mybatis的依赖节点，节点如下：

<dependencies>
    <dependency>
        <groupId>org.mybatis</groupId>
        <artifactId>mybatis</artifactId>
        <version>3.3.0</version>
    </dependency>
    <dependency>
        <groupId>mysql</groupId>
        <artifactId>mysql-connector-java</artifactId>
        <version>5.1.29</version>
    </dependency>
    <dependency>
        <groupId>junit</groupId>
        <artifactId>junit</artifactId>
        <version>4.12   </version>
        <scope>test</scope>
    </dependency>
    <dependency>
        <groupId>log4j</groupId>
        <artifactId>log4j</artifactId>
        <version>1.2.17</version>
    </dependency>
    <dependency>
        <groupId>org.slf4j</groupId>
        <artifactId>slf4j-api</artifactId>
        <version>1.7.12</version>
    </dependency>
    <dependency>
        <groupId>org.slf4j</groupId>
        <artifactId>slf4j-log4j12</artifactId>
        <version>1.7.12</version>
    </dependency>
</dependencies>

1.3创建数据库脚本：（MySQL数据库、数据库叫mybatis）

/*
SQLyog v10.2 
MySQL - 5.7.12-log : Database - mybatis
*********************************************************************
*/
/*!40101 SET NAMES utf8 */;
/*!40101 SET SQL_MODE=''*/;
/*!40014 SET @OLD_UNIQUE_CHECKS=@@UNIQUE_CHECKS, UNIQUE_CHECKS=0 */;
/*!40101 SET @OLD_SQL_MODE=@@SQL_MODE, SQL_MODE='NO_AUTO_VALUE_ON_ZERO' */;
/*!40111 SET @OLD_SQL_NOTES=@@SQL_NOTES, SQL_NOTES=0 */;
/*Table structure for table `person` */
CREATE TABLE `person` (
`ID` int(11) DEFAULT NULL,
`USERNAME` varchar(30) DEFAULT NULL,
`AGE` int(11) DEFAULT NULL,
`MOBiLEPHONE` varchar(30) DEFAULT NULL
) ENGINE=InnoDB DEFAULT CHARSET=utf8;
/*Data for the table `person` */
insert  into `person`(`ID`,`USERNAME`,`AGE`,`MOBiLEPHONE`) values (1,'神奇',18,'1361165680');
/*!40101 SET SQL_MODE=@OLD_SQL_MODE */;
/*!40014 SET UNIQUE_CHECKS=@OLD_UNIQUE_CHECKS */;
/*!40111 SET SQL_NOTES=@OLD_SQL_NOTES */;

1.4 MybatisUtil 创建工具类

package 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.Reader;
/**
 * Created by 123 on 2017/06/29.
 */
public class MybatisUtil {
    private final  static SqlSessionFactory sqlSessionFactory;

    static {
        String resource="mybatis-config.xml";
        Reader reader =null;
        try {
            reader = Resources.getResourceAsReader(resource);
        } catch (IOException e) {
            e.printStackTrace();
        }
        sqlSessionFactory = new SqlSessionFactoryBuilder().build(reader);
    }

    /**
     * 获取SqlSessionFactory
     * @return SqlSessionFactory
     */
    public static SqlSessionFactory getSqlSessionFactory(){
        return sqlSessionFactory;
    }

    /**
     * 获取SqlSession
     * @return SqlSession
     */
    public static SqlSession getSqlSession(){
        return sqlSessionFactory.openSession();
    }
    /**
     * 关闭SqlSession
     */
    public  static void closeSession(SqlSession sqlSession){
        if (sqlSession!=null)
            sqlSession.close();
    }
}

1.5Person实体类

package model;

/**
 * Created by 123 on 2017/06/29.                
 */
public class Person {
    private int id;
    private String userName ;
    private int age ;
    private String mobilePhone ;

    public Person() {
        this.id = id;
        this.userName = userName;
        this.age = age;
        this.mobilePhone = mobilePhone;
    }

    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 int getAge() {
        return age;
    }

    public void setAge(int age) {
        this.age = age;
    }

    public String getMobilePhone() {
        return mobilePhone;
    }

    public void setMobilePhone(String mobilePhone) {
        this.mobilePhone = mobilePhone;
    }
}

1.6 Person.xml 实体类查询配置文件

<?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">
    <insert id="insertPerson" parameterType="Person" >
        INSERT INTO PERSON(ID,USERNAME,AGE,MOBILEPHONE)VALUES (#{id},#{userName},#{age},#{mobilePhone})
    </insert>

    <select id="queryById" parameterType="int" resultType="Person">   //可省略
        SELECT * FROM PERSON WHERE ID=#{id}
    </select>

    <update id="updatePerson">
        UPDATE PERSON SET USERNAME=#{userName},AGE=#{age},MOBILEPHONE=#{mobilePhone} WHERE ID=#{id}
    </update>
</mapper>

1.7 config.properties 连接数据字段配置文件

driver=com.mysql.jdbc.Driver
url=jdbc:mysql://localhost:3306/mybatis
username=sa
password=123

1.8 mybatis-config.xml 连接数据库配置文件  (由于截图没有截完整，所以缺少一部分，请不要误解，下面有完整配置文件)。

<?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>
    <properties resource="config.properties"/>
    <typeAliases>
        <typeAlias type="model.Person" alias="Person"/>
    </typeAliases>
    <environments default="development">
        <environment id="development">
            <transactionManager type="JDBC"/>
            <dataSource type="POOLED">
                <property name="driver" value="${driver}"/>
                <property name="url" value="${url}"/>
                <property name="username" value="${username}"/>
                <property name="password" value="${password}"/>
            </dataSource>
        </environment>
    </environments>
    <mappers>
        <mapper resource="mapper/Person.xml"/>
    </mappers>
</configuration>

1.9 log4.properties 日志配置文件

<?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">
    <insert id="insertPerson" parameterType="Person" >
        INSERT INTO PERSON(ID,USERNAME,AGE,MOBILEPHONE)VALUES (#{id},#{userName},#{age},#{mobilePhone})
    </insert>

    <select id="queryById" parameterType="int" resultType="Person">
        SELECT * FROM PERSON WHERE ID=#{id}
    </select>

    <update id="updatePerson">
        UPDATE PERSON SET USERNAME=#{userName},AGE=#{age},MOBILEPHONE=#{mobilePhone} WHERE ID=#{id}
    </update>
</mapper>

2.0 PersonTest 测试类 (测试方法有两个，一个是插入数据方法，另外一个是查询对象名称方法，所以分两次截图了)

import model.Person;
import org.apache.ibatis.session.SqlSession;
import org.junit.Test;
import utils.MybatisUtil;
/**
 * Created by 123 on 2017/06/29.
 */
public class PersonTest {
    SqlSession sqlSession ;
        @Test
       public  void  insertPerson(){
            sqlSession = MybatisUtil.getSqlSession();
            Person person=new Person();
            person.setId(1);
            person.setAge(18);
            person.setMobilePhone("1361165680");
            person.setUserName("神奇");
            try {
                sqlSession.insert("insertPerson",person);
                sqlSession.commit();
            } catch (Exception e) {
                e.printStackTrace();
            } finally {
                MybatisUtil.closeSession(sqlSession);
            }
        }


        @Test
       public  void queryById(){
            sqlSession=MybatisUtil.getSqlSession();

            try {
                Person person =sqlSession.selectOne("queryById",1);
                sqlSession.commit();
                System.out.println(person.getUserName());
            } catch (Exception e) {
                e.printStackTrace();
            } finally {
                MybatisUtil.closeSession(sqlSession);
            }
        }
}

2.1最后成功插入数据,截图如下：

有什么问题咋们可以讨论一下，配置mybatis基础案例也接近尾声了，咋们下次再见吧。