（一）问候MyBatis3

第一节：MyBatis简介

　　百度百科

第二季：Mybatis版HolleWorld实现

　　例子：

mybatis-config.xml：

 1 <?xml version="1.0" encoding="UTF-8" ?>
 2 <!DOCTYPE configuration
 3 PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
 4 "http://mybatis.org/dtd/mybatis-3-config.dtd">
 5 <configuration>
 6     <properties resource="jdbc.properties"/> <!-- 引入jdbc.properties文件 -->
 7     <!-- 类型别名 -->
 8     <typeAliases>
 9         <typeAlias alias="Student" type="com.wishwzp.model.Student"/>
10     </typeAliases>
11     <!-- 开发环境，这里就写了一个id为development的数据环境 -->
12     <environments default="development">
13         <environment id="development">
14             <transactionManager type="JDBC" />
15             <dataSource type="POOLED">
16                 <property name="driver" value="${jdbc.driverClassName}" />
17                 <property name="url" value="${jdbc.url}" />
18                 <property name="username" value="${jdbc.username}" />
19                 <property name="password" value="${jdbc.password}" />
20             </dataSource>
21         </environment>
22     </environments>
23     
24     <mappers>
25         <mapper resource="com/wishwzp/mappers/StudentMapper.xml" />
26     </mappers>
27     
28 </configuration>

jdbc.properties：

1 jdbc.driverClassName=com.mysql.jdbc.Driver
2 jdbc.url=jdbc:mysql://localhost:3306/db_mybatis?characterEncoding=utf-8
3 jdbc.username=root
4 jdbc.password=root

StudentTest.java:

 1 package com.wishwzp.service;
 2 
 3 import org.apache.ibatis.session.SqlSession;
 4 
 5 import com.wishwzp.mappers.StudentMapper;
 6 import com.wishwzp.model.Student;
 7 import com.wishwzp.util.SqlSessionFactoryUtil;
 8 
 9 public class StudentTest {
10 
11     public static void main(String[] args) {
12         SqlSession sqlSession=SqlSessionFactoryUtil.openSession();
13         StudentMapper studentMapper=sqlSession.getMapper(StudentMapper.class);
14         //do work
15         Student student=new Student("李四",11);
16         int result=studentMapper.add(student);
17         sqlSession.commit();
18         if(result>0){
19             System.out.println("添加成功！");
20         }
21     }
22 }

SqlSessionFactoryUtil.java:

 1 package com.wishwzp.util;
 2 
 3 import java.io.InputStream;
 4 
 5 import org.apache.ibatis.io.Resources;
 6 import org.apache.ibatis.session.SqlSession;
 7 import org.apache.ibatis.session.SqlSessionFactory;
 8 import org.apache.ibatis.session.SqlSessionFactoryBuilder;
 9 
10 public class SqlSessionFactoryUtil {
11 
12     private static SqlSessionFactory sqlSessionFactory;
13     
14     public static SqlSessionFactory getSqlSessionFactory(){
15         if(sqlSessionFactory==null){
16             InputStream inputStream=null;
17             try{
18                 inputStream=Resources.getResourceAsStream("mybatis-config.xml");
19                 sqlSessionFactory=new SqlSessionFactoryBuilder().build(inputStream);
20             }catch(Exception e){
21                 e.printStackTrace();
22             }
23         }
24         return sqlSessionFactory;
25     }
26     
27     public static SqlSession openSession(){
28         return getSqlSessionFactory().openSession();
29     }
30 }

Student.java:

 1 package com.wishwzp.model;
 2 
 3 public class Student {
 4 
 5     private Integer id;
 6     private String name;
 7     private Integer age;
 8     
 9     public Student() {
10         super();
11         // TODO Auto-generated constructor stub
12     }
13     
14     public Student(String name, Integer age) {
15         super();
16         this.name = name;
17         this.age = age;
18     }
19 
20     public Integer getId() {
21         return id;
22     }
23     public void setId(Integer id) {
24         this.id = id;
25     }
26     public String getName() {
27         return name;
28     }
29     public void setName(String name) {
30         this.name = name;
31     }
32     public Integer getAge() {
33         return age;
34     }
35     public void setAge(Integer age) {
36         this.age = age;
37     }
38     
39 }

StudentMapper.java:

1 package com.wishwzp.mappers;
2 
3 import com.wishwzp.model.Student;
4 
5 public interface StudentMapper {
6 
7     public int add(Student student);
8 }

StudentMapper.xml:

 1 <?xml version="1.0" encoding="UTF-8" ?>
 2 <!DOCTYPE mapper
 3 PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
 4 "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
 5 <mapper namespace="com.wishwzp.mappers.StudentMapper">
 6 
 7     <insert id="add" parameterType="Student"  >
 8         insert into t_student values(null,#{name},#{age})
 9     </insert>
10 
11 </mapper>

数据库为db_mybatis：