本文详细介绍了在项目中配置持久层和数据库连接的过程，包括集成ibatis框架、导入依赖包、配置数据源以及实现消息板应用的数据操作。
github：https://github.com/wade6/messageboard-webx3
配置持久层
4、配置数据源
首先在本地新建一个mysql数据库，端口设为3306，数据库的名字为message_board，其中有两个表
user表
message表
在持久层使用spring框架中的ibatis，所以需要在项目中集成ibaits框架，而且数据库使用的是mysql，也要在项目中导入mysql的驱动依赖包，此外这个项目中会使用数据库连接池，所以也要导入数据库连接池的依赖包。
依赖的包可以在maven仓库里查找（http://search.maven.org/#search%7Cga%7C1%7C）；
查找ibatis，选择org.apache.servicemix.bundles.ibatis-sqlmap这个包，版本号2.3.4.726_4；
查找dbcp，选择commons-dbcp，版本号1.2.2；
查找mysql，选择mysql-connector-java，版本号5.1.6
注意：以上选的包只是随便选的，只是为了实现本项目的功能，没有什么标准，如果有其他要求，可以选择其他的包。
因为我们使用maven管理项目，可以方便的在pom.xml中配置这些依赖。
在pom.xml中增加的配置项如下：
-----------------------------------------------------------------------
设置依赖的版本号：
<properties>
......
<ibatis-version>2.3.4.726_4</ibatis-version>
<dbcp-version>1.2.2</dbcp-version>
<mysql-version>5.1.6</mysql-version>
</properties>
设置依赖的包：
<dependencies>
......
<!-- 集成 ibatis -导入依赖包-->
<dependency>
<groupId>commons-dbcp</groupId>
<artifactId>commons-dbcp</artifactId>
</dependency>
<dependency>
<groupId>org.apache.servicemix.bundles</groupId>
<artifactId>org.apache.servicemix.bundles.ibatis-sqlmap</artifactId>
</dependency>
<!-- 导入mysql驱动jar包 -->
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
</dependency>
</dependencies>
设置管理依赖项：
<dependencyManagement>
<dependencies>
<!-- 集成 ibatis -导入依赖包-->
<dependency>
<groupId>commons-dbcp</groupId>
<artifactId>commons-dbcp</artifactId>
<version>${dbcp-version}</version>
</dependency>
<dependency>
<groupId>org.apache.servicemix.bundles</groupId>
<artifactId>org.apache.servicemix.bundles.ibatis-sqlmap</artifactId>
<version>${ibatis-version}</version>
</dependency>
<!-- 导入mysql驱动jar包 -->
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>${mysql-version}</version>
</dependency>
</dependencies>
......
<dependencyManagement>
-----------------------------------------------------------------------
然后配置项目的持久层框架
首先在src/main/resources中建立以下文件：
配置上面的文件
dal-data-source.xml
-----------------------------------------------------------------------
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:context="http://www.springframework.org/schema/context"
xmlns:p="http://www.springframework.org/schema/p" xmlns:tx="http://www.springframework.org/schema/tx"
xmlns:aop="http://www.springframework.org/schema/aop"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans-2.5.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context-2.5.xsd
http://www.springframework.org/schema/aop
http://www.springframework.org/schema/aop/spring-aop-2.5.xsd
http://www.springframework.org/schema/tx
http://www.springframework.org/schema/tx/spring-tx-2.5.xsd">
<!-- 数据库配置 -->
<bean id= "dataSource" class="org.apache.commons.dbcp.BasicDataSource">
<property name="driverClassName" value="com.mysql.jdbc.Driver"></property>
<property name="url" value="jdbc:mysql://127.0.0.1:3306/message_board"></property>
<property name="username" value="webx3"></property>
<property name="password" value="webx3"></property>
<property name="minIdle" value="0" ></property>
<property name="maxWait" value="-1"></property>
</bean>
<bean id="transactionManager"
class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
<property name="dataSource" ref="dataSource" />
</bean>
<bean id="transactionTemplate"
class="org.springframework.transaction.support.TransactionTemplate">
<property name="transactionManager" ref="transactionManager"></property>
</bean>
<!-- iBatis SQL map定义 -->
<bean id="sqlMapClient" class="org.springframework.orm.ibatis.SqlMapClientFactoryBean">
<property name="dataSource" ref="dataSource" />
<property name="configLocation" value="classpath:sqlmap-config.xml" />
</bean>
</beans>
-----------------------------------------------------------------------
sqlmap-config.xml
-----------------------------------------------------------------------
<?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE sqlMapConfig PUBLIC "-//iBATIS.com//DTD SQL Map Config 2.0//EN" "http://www.ibatis.com/dtd/sql-map-config-2.dtd"> <sqlMapConfig> <sqlMap resource="sqlmap/user-sqlmap.xml" ></sqlMap> <sqlMap resource="sqlmap/message-sqlmap.xml" ></sqlMap> </sqlMapConfig>
-----------------------------------------------------------------------
message-sqlmap.xml
-----------------------------------------------------------------------
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE sqlMap PUBLIC "-//ibatis.apache.org//DTD SQL Map 2.0//EN" "http://ibatis.apache.org/dtd/sql-map-2.dtd" >
<sqlMap namespace="message" >
<typeAlias alias="messageDO" type="com.alibaba.webx3.messageboard.dao.object.MessageDO" />
<insert id="insertMessage" parameterClass="messageDO" >
insert into message (
id,
title,
author,
content,
gmt_create,
gmt_modified
) values (
#id#,
#title#,
#author#,
#content#,
now(),
now()
)
<selectKey resultClass="int" keyProperty="id">
<![CDATA[SELECT LAST_INSERT_ID() AS ID ]]>
</selectKey>
</insert>
<select id="selectById" parameterClass="int" resultClass="messageDO" >
select
id,
title,
author,
content,
gmt_create,
gmt_modified
from
message
where
id=#id#
</select>
<select id="selectBylist" parameterClass="map" resultClass="messageDO" >
select
id,
title,
author,
content,
gmt_create,
gmt_modified
from
message
order by gmt_modified desc
limit #from#,#size#
</select>
<update id="updateMessage" parameterClass="messageDO">
update
message
set
gmt_modified = now()
<dynamic prepend="" >
<isNotEmpty prepend="," property="title">
title = #title#
</isNotEmpty>
<isNotEmpty prepend="," property="author">
author = #author#
</isNotEmpty>
<isNotEmpty prepend="," property="content">
content = #content#
</isNotEmpty>
</dynamic>
where id = #id#
</update>
<delete id="deleteMessage" parameterClass="int">
delete
from
message
where
id=#id#
</delete>
</sqlMap>
-----------------------------------------------------------------------
user-sqlmap.xml
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE sqlMap PUBLIC "-//ibatis.apache.org//DTD SQL Map 2.0//EN" "http://ibatis.apache.org/dtd/sql-map-2.dtd" >
<sqlMap namespace="user">
<typeAlias alias="userDO" type="com.alibaba.webx3.messageboard.dao.object.UserDO" />
<insert id="insertUser" parameterClass="userDO" >
insert into user (
id,
username,
password,
gmt_create,
gmt_modified
) values (
#id#,
#username#,
#password#,
now(),
now()
)
<selectKey resultClass="int" keyProperty="id">
<![CDATA[SELECT LAST_INSERT_ID() AS ID ]]>
</selectKey>
</insert>
<select id="selectByUsername" parameterClass="String" resultClass="userDO" >
select
id,
username,
password,
gmt_create,
gmt_modified
from
user
where
username=#username#
</select>
<update id="updateuser" parameterClass="userDO">
update
user
set
gmt_modified = now()
<dynamic prepend="" >
<isNotEmpty prepend="," property="username">
username = #username#
</isNotEmpty>
<isNotEmpty prepend="," property="password">
password = #password#
</isNotEmpty>
</dynamic>
where id = #id#
</update>
<delete id="deleteuser" parameterClass="userDO">
delete
from
user
where
id=#id#
</delete>
</sqlMap>-----------------------------------------------------------------------
最后，在webx配置文件webx-messageboard.xml中添加如下配置，将持久层加载到webx容器中：
<beans:import resource="classpath:dal/dal-data-source.xml" />
至此，数据源配置结束。
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