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2005年02月18日
Tomcat5.5.X与Tomcat5.0.X配置数据库连接池的不同之处
Tomcat5.0.X配置数据库连接池，是分别配置Resource和ResourceParams，如代码: <Resource name="jdbc/ExampleDB" auth="Container" type="javax.sql.DataSource"/>
<ResourceParams name="jdbc/ExampleDB">
<parameter>
<name>factory</name>
<value>org.apache.commons.dbcp.BasicDataSourceFactory</value>
</parameter>
<!-- 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 0 for no limit.
-->
<parameter>
<name>maxActive</name>
<value>100</value>
</parameter>
<!-- Maximum number of idle dB connections to retain in pool.
Set to 0 for no limit.
-->
<parameter>
<name>maxIdle</name>
<value>30</value>
</parameter>
<!-- 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.
-->
<parameter>
<name>maxWait</name>
<value>10000</value>
</parameter>
<!-- MySQL dB username and password for dB connections -->
<parameter>
<name>username</name>
<value>root</value>
</parameter>
<parameter>
<name>password</name>
<value></value>
</parameter>
<!-- Class name for mm.mysql JDBC driver -->
<parameter>
<name>driverClassName</name>
<value>com.mysql.jdbc.Driver</value>
</parameter>
<!-- The JDBC connection url for connecting to your MySQL dB.
The autoReconnect=true argument to the url makes sure that the
mm.mysql JDBC Driver will automatically reconnect if mysqld closed the
connection. mysqld by default closes idle connections after 8 hours.
-->
<parameter>
<name>url</name>
<value>jdbc:mysql://192.168.0.88:3306/quickoa</value>
</parameter>
</ResourceParams>
而在Tomcat5.5.X中，这两者合二为一了，直接配置Resource就可以了，如代码: <Resource name="jdbc/ExampleDB" auth="Container"
type="javax.sql.DataSource" driverClassName="com.mysql.jdbc.Driver"
url="jdbc:mysql://localhost/quickoa" username="root"
password="" maxActive="100" maxIdle="30" maxWait="10000" />
又，值得注意的是在Tomcat5.5.X中，dbcp组件需要自己额外下载的，不像在Tomcat5.0.X中已经附带了。
