tomcat JNDI 连接池

 

一.在tomcat_home/common/lib下放入jdbc的驱动程序,额外说一下，如果是使用sql server的话，有至少两个驱动可以选择，一个是微软提供的，另一个是 jtds，比微软的要好很多，推荐使用

二.配置文件，tomcat 不同的版本配置文件略有不同，下面以tomcat5..5.*为例。

三.如果配置不正确会出现javax.naming.NameNotFoundException: Name is not bound in this Context 错误
方式一、全局数据库连接池
1、通过管理界面配置连接池，或者直接在tomcat/conf/server.xml的GlobalNamingResources中增加
<Resource name="jdbc/mydb" type="javax.sql.DataSource" password="mypwd" driverClassName="com.microsoft.jdbc.sqlserver.SQLServerDriver" maxIdle="2" maxWait="5000" validationQuery="select 1" username="sa" url="jdbc:microsoft:sqlserver://localhost:1433;DatabaseName=mydb" maxActive="4"/>
2、在tomcat/webapps/myapp/META-INF/context.xml的Context中增加：
<ResourceLink global="jdbc/mydb" name="jdbc/mydb" type="javax.sql.DataSource"/>
这样就可以了。
方式二、全局数据库连接池
1、同上
2、在tomcat/conf/context.xml的Context中增加：
<ResourceLink global="jdbc/mydb" name="jdbc/mydb" type="javax.sql.DataSource"/>
方式三、局部数据库连接池
只需在tomcat/webapps/myapps/META-INF/context.xml的Context中增加：
<Resource name="jdbc/mydb" type="javax.sql.DataSource" password="mypwd" driverClassName="com.microsoft.jdbc.sqlserver.SQLServerDriver" maxIdle="2" maxWait="5000" validationQuery="select 1" username="sa" url="jdbc:microsoft:sqlserver://localhost:1433;DatabaseName=mydb" maxActive="4"/>
参数说明：
driveClassName：JDBC驱动类的完整的名称； 
maxActive：同时能够从连接池中被分配的可用实例的最大数； 
maxIdle：可以同时闲置在连接池中的连接的最大数； 
maxWait：最大超时时间，以毫秒计； 
password：用户密码； 
url：到JDBC的URL连接； 
user：用户名称； 
validationQuery：用来查询池中空闲的连接。
以上三种方式在tomcat 5.5.4下都可以。另外，sql server的jdbc driver是从微软网站上下载的sql server jdbc (sp3)。

下面 分别举tomcat5.0 和tomcat 5.5  配置文件 的例子（将此配置文件置于Tomcat /conf/Catalina/localhost 下）

tomcat5.0

 <Resource name="jdbc/test" auth="Container" type="javax.sql.DataSource"/>
    <ResourceParams name="jdbc/test">
        <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>sa</value>
        </parameter>
        <parameter>
            <name>password</name>
            <value>test</value>
        </parameter>
        <!-- Class name for JDBC driver -->
        <parameter>
            <name>driverClassName</name>
            <value>net.sourceforge.jtds.jdbc.Driver</value>
        </parameter>
        <!-- Autocommit setting.  This setting is required to make
             Hibernate work.  Or you can remove calls to commit(). -->
        <parameter>
            <name>defaultAutoCommit</name>
            <value>true</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:jtds:sqlserver://url/filedb;charset=gb2312;autoReconnect=true</value>
        </parameter>
        <!-- Recover abandoned connections -->
        <parameter>
            <name>removeAbandoned</name>
            <value>true</value>
        </parameter>
        <!-- Set the number of seconds a dB connection has been idle 
             before it is considered abandoned. 
             -->
        <parameter>
            <name>removeAbandonedTimeout</name>
            <value>60</value>
        </parameter>
        <!-- Log a stack trace of the code which abandoned the dB 
             connection resources. 
             -->
        <parameter>
            <name>logAbandoned</name>
            <value>true</value>
        </parameter>
    </ResourceParams>

tomcat 5.5

  <Resource name="jdbc/test" auth="Container" type="javax.sql.DataSource"
              maxActive="100" maxIdle="30" maxWait="10000"
              driverClassName="oracle.jdbc.driver.OracleDriver"
              username="test" password="test" 
              url="jdbc:oracle:thin:@url:1521:dcdb"
              defaultAutoCommit="true" removeAbandoned="true" 
              removeAbandonedTimeout="60" logAbandoned="true"/>

可以看到 5.0 中原来是元素的项在5.5中变成了属性