开源软件问题记录系列 之一 在 Tomcat 中设置 Datasource

开源软件问题记录系列 之一 在 Tomcat 中设置 Datasource

Tomcat提供了灵活且简单的JNDI及Datasource设置方式。

这里，记录我在学习应用过程中的问题。

1. 首先要在你的自己的应用程序中WEB-INF/web.xml 中添加一个Resource-ref, 指定Datasource 的 JNDI。
    <resource-ref>
      <description>DB Connection</description>
      <res-ref-name>jdbc/storedb</res-ref-name>
      <res-type>javax.sql.DataSource</res-type>
      <res-auth>Container</res-auth>
  </resource-ref>
2. 在Tomcat的 config/context.xml中添加Resource。 （本例中使用的是MySql作为 DB）

   <!-- maxActive: Maximum number of dB connections in pool. Make sure you
         configure your mysqld max_connections large enough to handle
         all of your db connections. Set to -1 for no limit.
         -->

    <!-- maxIdle: Maximum number of idle dB connections to retain in pool.
         Set to -1 for no limit.  See also the DBCP documentation on this
         and the minEvictableIdleTimeMillis configuration parameter.
         -->

    <!-- maxWait: Maximum time to wait for a dB connection to become available
         in ms, in this example 10 seconds. An Exception is thrown if
         this timeout is exceeded.  Set to -1 to wait indefinitely.
         -->

    <!-- username and password: MySQL dB username and password for dB connections  -->

    <!-- driverClassName: Class name for the old mm.mysql JDBC driver is
         org.gjt.mm.mysql.Driver - we recommend using Connector/J though.
         Class name for the official MySQL Connector/J driver is com.mysql.jdbc.Driver.
         -->
   
    <!-- url: The JDBC connection url for connecting to your MySQL dB.
         -->

  <Resource name="jdbc/storedb" auth="Container" type="javax.sql.DataSource"
               maxActive="100" maxIdle="30" maxWait="10000"
               username="root" password="passw0rd" driverClassName="com.mysql.jdbc.Driver"
               url="jdbc:mysql://localhost:3306/storedb"/>