继续问：sql2005数据库连接池问题
我的数据库连接池已经做好了配置：
所以该配置的xml文件如下：
MyWeb.xml: 
<?xml version="1.0" encoding="UTF-8"?>  
<Context>  
  　　  
  <Resource 
  name="jdbc/mysql" 
  type="javax.sql.DataSource" 
  maxActive="4" 
  maxIdle="2" 
  username="sa" 
  maxWait="5000" 
  driverClassName="com.microsoft.sqlserver.jdbc.SQLServerDriver" 
  factory="org.apache.tomcat.dbcp.dbcp.BasicDataSourceFactory" 
  password="123456" 
  url="jdbc:microsoft:sqlserver://localhost/EdocServer_db"/> 
  　　  
</Context> 

server.xml: 
<?xml version="1.0" encoding="UTF-8"?> 
<Server> 
  <Listener className="org.apache.catalina.core.AprLifecycleListener"/> 
  <Listener className="org.apache.catalina.mbeans.GlobalResourcesLifecycleListener"/> 
  <Listener className="org.apache.catalina.storeconfig.StoreConfigLifecycleListener"/> 
  <Listener className="org.apache.catalina.mbeans.ServerLifecycleListener"/> 
  <GlobalNamingResources> 
  <Environment 
  name="simpleValue" 
  type="java.lang.Integer" 
  value="30"/> 
  <Resource 
  name="jdbc/mysql" 
  type="javax.sql.DataSource" 
  maxActive="4" 
  maxIdle="2" 
  username="sa" 
  maxWait="5000" 
  driverClassName="com.microsoft.sqlserver.jdbc.SQLServerDriver" 
  factory="org.apache.tomcat.dbcp.dbcp.BasicDataSourceFactory" 
  password="123456" 
  url="jdbc:microsoft:sqlserver://localhost/EdocServer_db"/> 
  <Resource 
  auth="Container" 
  description="User database that can be updated and saved" 
  name="UserDatabase" 
  type="org.apache.catalina.UserDatabase" 
  pathname="conf/tomcat-users.xml" 
  factory="org.apache.catalina.users.MemoryUserDatabaseFactory"/> 
  </GlobalNamingResources> 
  <Service 
  name="Catalina"> 
  <Connector 
  port="8080" 
  redirectPort="8443" 
  minSpareThreads="25" 
  connectionTimeout="20000" 
  maxSpareThreads="75" 
  maxThreads="150"> 
  </Connector> 
  <Connector 
  port="8009" 
  redirectPort="8443" 
  protocol="AJP/1.3"> 
  </Connector> 
  <Engine 
  defaultHost="localhost" 
  name="Catalina"> 
  <Realm className="org.apache.catalina.realm.UserDatabaseRealm"/>&n