Mybatis使用篇之四：整合Spring
Mybaits为什么要整合Spring?
说白了其实就想使用Spring提供的服务，比如Spring的事务管理、Spring的IOC对Bean进行管理等。
Mybatis怎么整合Spring?
由于目前Spring官方还没有出整合Mybatis的特性，所以这里在Spring框架和MyBatis框架上再添加用于整合的框架“mybatis-spring-1.0.2.jar” (该框架时MyBatis官方自己出的)。
（1）新建一个Web工程，名称为MybatisSpring。
（2）将Spring3.0.3、Mybatis3.0.6、Mybatis－Spring1.0.2、log4j、Oracle驱动和DBCP连接池的JAR包放到Web工程的lib下面，具体的JAR包如下：
classes12.jar log4j-1.2.16.jar mybatis-3.0.6.jar mybatis-spring-1.0.2.jar org.springframework.aop-3.0.3.RELEASE.jar org.springframework.asm-3.0.3.RELEASE.jar org.springframework.aspects-3.0.3.RELEASE.jar org.springframework.beans-3.0.3.RELEASE.jar org.springframework.context-3.0.3.RELEASE.jar org.springframework.context.support-3.0.3.RELEASE.jar org.springframework.core-3.0.3.RELEASE.jar org.springframework.expression-3.0.3.RELEASE.jar org.springframework.jdbc-3.0.3.RELEASE.jar org.springframework.transaction-3.0.3.RELEASE.jar org.springframework.web-3.0.3.RELEASE.jar commons-logging-1.1.1.jar commons-dbcp-1.2.jar commons-pool-1.4.jar
（3）在src下面新建log4j.properties文件，该文件的内容如下：
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Oracle数据库执行以下SQL，创建一个USER_INFO的表：
-- 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');
（5）新建一个Java类UserInfo.java，该类的内容如下：
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;
}
}（6）在com.user.sqlmap下面新建UserInfo.xml文件，该文件的内容如下：
<?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">
<![CDATA[
select * from user_info where id = #{id}
]]>
</select>
</mapper>（7）在src下面新建mybatis.cfg.xml文件，该文件的内容如下：
<?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>
<mappers>
<mapper resource="com/user/sqlmap/UserInfo.xml" />
</mappers>
</configuration>（8）新建一个Java类UserService.java，该类的内容如下：
package com.user;
import org.mybatis.spring.SqlSessionTemplate;
public class UserService {
private SqlSessionTemplate sqlSession;
public SqlSessionTemplate getSqlSession() {
return sqlSession;
}
public void setSqlSession(SqlSessionTemplate sqlSession) {
this.sqlSession = sqlSession;
}
public UserInfo selectUser(){
UserInfo user = null;
try {
user = (UserInfo) sqlSession.selectOne("User.selectUser", "1");
} catch (Exception e) {
e.printStackTrace();
}
return user;
}
}（9）在src下面新建applicationContext.xml文件，该文件的内容如下：
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
default-autowire="byName"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd">
<bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource">
<property name="driverClassName" value="oracle.jdbc.OracleDriver" />
<property name="url" value="jdbc:oracle:thin:@localhost:1521:SID" />
<property name="username" value="xxxx" />
<property name="password" value="xxxx" />
<property name="maxActive" value="100"></property>
<property name="maxIdle" value="30"></property>
<property name="maxWait" value="500"></property>
<property name="defaultAutoCommit" value="true"></property>
</bean>
<bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
<property name="configLocation" value="classpath:mybatis.cfg.xml"></property>
<property name="dataSource" ref="dataSource" />
</bean>
<bean id="sqlSessionTemplate" class="org.mybatis.spring.SqlSessionTemplate">
<constructor-arg index="0" ref="sqlSessionFactory" />
</bean>
<bean id="userService" class="com.user.UserService">
<property name="sqlSession" ref="sqlSessionTemplate" />
</bean>
</beans>（10）新建一个测试Java类UserInfoTest.java，该类的具体内容如下：
package com.user;
import java.io.IOException;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
public class UserInfoTest {
/**
* @param args
* @throws IOException
*/
public static void main(String[] args) throws IOException {
ApplicationContext context = new ClassPathXmlApplicationContext("applicationContext.xml");
UserService userService = (UserService)context.getBean("userService");
UserInfo userInfo = userService.selectUser();
System.out.println(userInfo);
}
}（11）右键UserInfoTest 类，选择Run As Application，运行MyBaits操作数据库。
log4j:WARN No appenders could be found for logger (org.springframework.context.support.ClassPathXmlApplicationContext). 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 21:13:42,156 DEBUG [java.sql.PreparedStatement] -==> Executing: select * from user_info where id = ? 2012-02-11 21:13:42,156 DEBUG [java.sql.PreparedStatement] -==> Parameters: 1(String) ID: 1, Name: 张三
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