根据下图myBatis的架构，创建一个使用MyBatis的工程。
一、配置MyBatis 环境（如图）
1、sqlMapConfig.xml
首先，导入jar包（上图右边）并加载路径，然后在目录下创建一个xml文件 sqlMapConfig.xml , 并添加以下配置代码, 这就是上图架构中的第一步配置mybatis环境,
<?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="development">
<environment id="development">
<!-- 使用jdbc事务管理 -->
<transactionManager type="JDBC" />
<!-- 数据库连接池 -->
<dataSource type="POOLED">
<property name="driver" value="com.mysql.jdbc.Driver" />
<property name="url"
value="jdbc:mysql://localhost:3306/mybatis?characterEncoding=utf-8" />
<property name="username" value="root" />
<property name="password" value="root" />
</dataSource>
</environment>
</environments>
2. 配置Mappern.xml
在src目录下创建一个包叫sqlmap， 用来放mappern.xml， 然后在在该包下面创建一个User.xml 文件，并输入下面代码
<?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">
<!-- namespace：命名空间，用于隔离sql，还有一个很重要的作用，后面会讲 -->
<mapper namespace="test">
//通过id查询用户
<select id="findUserById" parameterType ="Integer" resultType="mybatis.pojo.User">
select * from user where id = #{v}
</select>
//模糊查询用户
<select id="findUserByUsername" parameterType ="String" resultType="mybatis.pojo.User">
select * from user where username like '%${value}%'
</select> //添加用户
<insert id=”insertUser” parameterType =”mybatis.pojo.User”>
insert into user (username,birthday,address,sex)
values(#{username},#{birthday},#{address},#{sex})
</insert>
// 更新用户信息
<update id=”updateUserById” parameterType=”mybatis.pojo.User”>
update user
set username = #{username},sex = #{sex},birthday = #{birthday},address = #{address}
where id = #{id}
</update>
//通过id删除用户
<delete id=”deleteUserById” parameterType=”Integer”>
delete from user
where id = #{vvvvv}
</delete>
</mapper>
3. 然后在src目录下创建log4j.properties用来输出日志，并输入以下信息
# Global logging configuration
log4j.rootLogger=DEBUG, stdout
# Console output...
log4j.appender.stdout=org.apache.log4j.ConsoleAppender
log4j.appender.stdout.layout=org.apache.log4j.PatternLayout
log4j.appender.stdout.layout.ConversionPattern=%5p [%t] - %m%n
4、在src下创建mybatis.pojo包，并创建User类
package mybatis.pojo;
import java.io.Serializable;
import java.util.Date;public class User implements Serializable { private static final long serialVersionUID = 1L;
private Integer id;
private String username;
private String sex;
private Date birthday;
private String address; public Integer getId() {
return id;
}
//......................................省略
二、 构造SqlSessionFactory、通过SqlSessionFactory创建sqlSession会话、通过sqlSession操作数据库
1、在src目录下创建测试包testpackage和测试文件TesMybatis 并输入以下package testpackageimport mybatis.pojo.User;
import java.io.InputStream;
import java.util.List;
import org.apache.ibatis.io.Resources;
import org.apache.ibatis.session.SqlSession;
import org.apache.ibatis.session.SqlSessionFactory;
import org.apache.ibatis.session.SqlSessionFactoryBuilder;public class TestMybatis { public static void main(String[] args) throws Exception {
testMybatis();
} public static void testMybatis() throws Exception{
//配置mybatis环境配置信息
String resource = "sqlMapConfig.xml";
InputStream in =Resources.getResourceAsStream(resource);
//构造SqlSessionFactory(会话工厂) SqlSessionFactory sqlSessionFactory = new SqlSessionFactoryBuilder().build(in); //通过SqlSessionFactory创建sqlSession会话
SqlSession sqlSession = sqlSessionFactory.openSession();
/*
(1)通过用户id查找用户
*/
User user = sqlSession.selectOne("test.findUserById", "o");
System.out.println(user); /*
(2)模糊查询
*/
List<User> users = sqlSession.selectList("test.findUserByUsername", "J");
for(User user2: users){
System.out.println(user2);
} /*
（3）增加用户
*/
User user3 = new User();
user3.setUsername(“Jane”);
user3.setBirthday(new Date());
user3.setAddress(“MountainView”);
user3.setSex(“1”);
sqlSession.insert(“test.insertUser”, user3);
sqlSession.commit();
/*
（4）更新用户信息
*/
User user4 = new User();
user4.setId(10);
user4.setUsername(“Luo”);
user4.setBirthday(new Date());
user4.setAddress(“21811”);
user4.setSex(“1”);
sqlSession.update(“test.updateUserById”, user4);
sqlSession.commit();
/*
（5）删除用户信息
*/
sqlSession.delete(“test.deleteUserById”, 29);
sqlSession.commit()；
}}
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