Mybaits技术（一） Mybatis入门示例
1. 搭建开发环境
（1）新建一个Web工程，名称为MybatisFramework。
（2）将以下的JAR放到Web工程的lib下面：
Java代码
[*]mybatis-3.0.6.jar
[*]og4j-1.2.16.jar
[*]classes12.jar
（3）在src下面新建log4j.properties文件，该文件的内容如下：
Java代码
[*]log4j.appender.stdout=org.apache.log4j.ConsoleAppender
[*]log4j.appender.stdout.layout=org.apache.log4j.PatternLayout
[*]log4j.appender.stdout.layout.ConversionPattern=%d %p [%c] -%m%n
[*]log4j.logger.com.ibatis=debug
[*]log4j.logger.com.ibatis.common.jdbc.SimpleDataSource=debug
[*]log4j.logger.com.ibatis.common.jdbc.ScriptRunner=debug
[*]log4j.logger.com.ibatis.sqlmap.engine.impl.SqlMapClientDelegate=debug
[*]log4j.logger.java.sql.Connection=debug
[*]log4j.logger.java.sql.Statement=debug
[*]log4j.logger.java.sql.PreparedStatement=debug,stdout
（4）在src下面新建mybatis.cfg.xml文件，该文件的内容如下：
Java代码
[*]<?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">
[*] <transactionManager type="JDBC" />
[*] <dataSource type="POOLED">
[*] <property name="driver" value="oracle.jdbc.OracleDriver" />
[*] <property name="url" value="jdbc:oracle:thin:@localhost:1521:SID" />
[*] <property name="username" value="xxxx" />
[*] <property name="password" value="xxxx" />
[*] </dataSource>
[*] </environment>
[*] </environments>
[*]
[*] </configuration>
2. 入门示例
（1）在Oracle数据库执行以下SQL，创建一个USER_INFO的表：
Java代码
[*]-- Create table
[*]create table USER_INFO
[*](
[*] ID NUMBER(12) not null,
[*] NAME VARCHAR2(50)
[*]);
[*]
[*]--Insert data
[*]insert into USER_INFO(ID,NAME) values(1,'张三');
（2）新建一个Java类UserInfo.java，该类的内容如下：
Java代码
[*]package com.user;
[*]
[*]public class UserInfo {
[*] private int id;
[*] private String name;
[*]
[*] public UserInfo() {
[*] }
[*]
[*] public UserInfo(String name) {
[*] this(0, name);
[*] }
[*]
[*] public UserInfo(int id, String name) {
[*] this.id = id;
[*] this.name = name;
[*] }
[*]
[*] public int getId() {
[*] return id;
[*] }
[*]
[*] public void setId(int id) {
[*] this.id = id;
[*] }
[*]
[*] public String getName() {
[*] return name;
[*] }
[*]
[*] public void setName(String name) {
[*] this.name = name;
[*] }
[*]
[*] @Override
[*] public String toString() {
[*] return "ID: " + id + ", Name: " + name;
[*] }
[*]}
（3）在com.user.sqlmap下面新建UserInfo.xml文件，该文件的内容如下：
Java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">
[*]
[*]<mapper namespace="User">
[*] <select id="selectUser" parameterType="int" resultType="UserInfo">
[*] <!
[*] select * from user_info where id = #{id}
[*] ]]>
[*] </select>
[*]</mapper>
（4）将UserInfo.xml引用到mybatis.cfg.xml文件中，mybatis.cfg.xml文件更新后的内容如下：
Java代码
[*]<?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>
[*] <typeAliases>
[*] <typeAlias alias="UserInfo" type="com.user.UserInfo" />
[*] </typeAliases>
[*]
[*] <environments default="development">
[*] <environment id="development">
[*] <transactionManager type="JDBC" />
[*] <dataSource type="POOLED">
[*] <property name="driver" value="oracle.jdbc.OracleDriver" />
[*] <property name="url" value="jdbc:oracle:thin:@localhost:1521:ORACLEDB" />
[*] <property name="username" value="oracle" />
[*] <property name="password" value="oracle" />
[*] </dataSource>
[*] </environment>
[*] </environments>
[*]
[*] <mappers>
[*] <mapper resource="com/user/sqlmap/UserInfo.xml" />
[*] </mappers>
[*]</configuration>
（5）新建一个测试Java类UserInfoTest.java，该类的具体内容如下：
Java代码
[*]package com.user;
[*]
[*]import java.io.IOException;
[*]import java.io.Reader;
[*]
[*]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 UserInfoTest {
[*]
[*] /**
[*] * @param args
[*] * @throws IOException
[*] */
[*] public static void main(String[] args) throws IOException {
[*] String resource = "mybatis.cfg.xml";
[*] Reader reader = Resources.getResourceAsReader(resource);
[*] SqlSessionFactory ssf = new SqlSessionFactoryBuilder().build(reader);
[*]
[*] SqlSession session = ssf.openSession();
[*]
[*] try {
[*] UserInfo user = (UserInfo) session.selectOne("User.selectUser", "1");
[*] System.out.println(user);
[*] } catch (Exception e) {
[*] e.printStackTrace();
[*] } finally {
[*] session.close();
[*] }
[*] }
[*]
[*]}
（6）右键UserInfoTest 类，选择Run As Application，运行MyBaits操作数据库。
Java代码
[*]log4j:WARN No appenders could be found for logger (org.apache.ibatis.logging.LogFactory).
[*]log4j:WARN Please initialize the log4j system properly.
[*]log4j:WARN See http://logging.apache.org/log4j/1.2/faq.html#noconfig for more info.
[*]2012-02-11 21:44:01,750 DEBUG -==> Executing: select * from user_info where id = ?
[*]2012-02-11 21:44:01,781 DEBUG -==> Parameters: 1(String)
[*]ID: 1, Name: 张三
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