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>

节点

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,'');
 /*!40101 SET SQL_MODE=@OLD_SQL_MODE */;
 /*!40014 SET UNIQUE_CHECKS=@OLD_UNIQUE_CHECKS */;
 /*!40111 SET SQL_NOTES=@OLD_SQL_NOTES */;

数据库脚本

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();
     }
 }

工具类

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;
     }
 }

实体类

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>

小配置文件

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

连接字段（配置文件）

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>

连接数据库配置文件（和上面是有关联的）

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>

记录日志配置文件

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);
             }
         }
 }

测试类

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。