<dependency><groupId>org.mybatis</groupId><artifactId>mybatis</artifactId><version>3.2.8</version>
</dependency>
<dependency><groupId>junit</groupId><artifactId>junit</artifactId><version>4.11</version>
</dependency>
<dependency><groupId>mysql</groupId><artifactId>mysql-connector-java</artifactId><version>5.1.35</version>
</dependency>
<dependency><groupId>commons-logging</groupId><artifactId>commons-logging</artifactId><version>1.1.1</version>
</dependency>
<dependency><groupId>log4j</groupId><artifactId>log4j</artifactId><version>1.2.17</version>
</dependency>

CREATE TABLE `user` (`id` int(11) NOT NULL AUTO_INCREMENT,`username` varchar(32) NOT NULL,`birthday` date DEFAULT NULL,`sex` char(1) DEFAULT NULL,`address` varchar(256) DEFAULT NULL,PRIMARY KEY (`id`)
);

<?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"><!-- 配置该工程所使用的事务管理器类型，JDBC 为  JdbcTransactionFactory.class 的别名 --><transactionManager type="JDBC" /><!-- 配置数据源类型, POOLED 为 PooledDataSourceFactory.class 的别名 --><dataSource type="POOLED"><property name="driver" value="com.mysql.jdbc.Driver" /><property name="url" value="jdbc:mysql://localhost:3306/mybatis" /><property name="username" value="root" /><property name="password" value="123456" /></dataSource></environment></environments><mappers><!-- 配置工程所使用的 User 的 Mapper 映射文件路径 --><mapper resource="mapper/user.xml"/></mappers>
</configuration>

# 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

public class User {public int id;public String username;public Date birthday;public String sex;public String address;
}

<?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="test"><select id="getUserById" parameterType="int" resultType="cn.xleos.mybatisfirst.po.User">SELECT * FROM user WHERE id = #{value}</select>
</mapper>

package cn.xleos.mybatisfirst.test;import java.io.InputStream;
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 cn.xleos.mybatisfirst.po.User;public class MybatisFirstTest {private SqlSessionFactory sqlSessionFactory; @Beforepublic void setUp() throws Exception {// 1. 读取  MybatisConfig.xml 自定义命名的全局配置文件.//    getResourceAsStream 使用的资源路径//    getUrlAsStream 使用的是文件路径InputStream inputStream = Resources.getResourceAsStream("MybatisConfig.xml");// 2. 使用sqlSession的工厂构造器来读入全局配置，再生成一个sqlSession工厂.sqlSessionFactory = new SqlSessionFactoryBuilder().build(inputStream);}@Testpublic void getUserByIdTest() {// 3. 通过 sqlSession 工厂打开一个 sqlSessionSqlSession sqlSession = sqlSessionFactory.openSession();try {// 4. 使用 selectOne 来调用 user.xml 配置中的(命名空间+statementId) text.getUserById 节的SQL语句//    并传入简单类型参数值  1User user = sqlSession.selectOne("test.getUserById", 1);System.out.println(user);}finally{sqlSession.close();}}
}

DEBUG [main] - Opening JDBC Connection
DEBUG [main] - Created connection 660143728.
DEBUG [main] - Setting autocommit to false on JDBC Connection [com.mysql.jdbc.JDBC4Connection@2758fe70]
DEBUG [main] - ==>  Preparing: SELECT * FROM user WHERE id = ?
DEBUG [main] - ==> Parameters: 1(Integer)
DEBUG [main] - <==      Total: 1
User [id=1, username=王五, birthday=null, sex=2, address=null]
DEBUG [main] - Resetting autocommit to true on JDBC Connection [com.mysql.jdbc.JDBC4Connection@2758fe70]
DEBUG [main] - Closing JDBC Connection [com.mysql.jdbc.JDBC4Connection@2758fe70]
DEBUG [main] - Returned connection 660143728 to pool.