Tomcat Connection Pool 与 context设置问题

[cscxxx]

在Tomcat上有10个项目，据观察这10个项目都会套用同一个connection pool设置，问题是怎么设置可以让不同的项目套用不同的connection pool设置?(tomcat上已经有多组的connection pool设置)
connection pool在context.xml设置如下(web.xml里没设置envContext.lookup时直接给以下的name就是TTT):

<WatchedResource>WEB-INF/web.xml</WatchedResource>
      <Resource
      name="TTT"
      type="javax.sql.DataSource"
      password="user"
      driverClassName="oracle.jdbc.driver.OracleDriver"
      initialSize="10"
      maxIdle="10"
      minIdle="10"
      maxWait="10000"
      validationQuery = "select 1 from dual"
      testWhileIdle = "true"
      testOnBorrow = "false"
      timeBetweenEvictionRunsMillis = "30000"
      minEvictableIdleTimeMillis = "75000"
      numTestsPerEvictionRun="40"
      username="user"
      url="jdbc:oracle:thin:@localhost.tpvaoc.com:1521:orcl"
      maxActive="250"
      removeAbandoned="true"
      removeAbandonedTimeout="50"
      logAbandoned="true"
      />