Mybatis使用篇之四：整合Spring

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：

Java代码


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：

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');

（5）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;
}
}

（6）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">
<![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：

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>

<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：

Java代码


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：

Java代码


<?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：

Java代码


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。

Java代码


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