这是一道面试题目,请你给我写一个Struts 连接数据库。

Question

    请大家帮帮忙，如果可以的话，发一个例子到[email protected]，谢谢大家。

Answer 1

strust-config.xml
<data-sources>
         <data-source>
           <set-property
                 property="autoCommit"
                 value="false"/>
           <set-property
                 property="description"
                 value="Example Data Source Configuration"/>
           <set-property
                 property="driverClass"
                 value="org.postgresql.Driver"/>
           <set-property
                 property="maxCount"
                 value="4"/>
           <set-property
                 property="minCount"
                 value="2"/>
           <set-property
                 property="password"
                 value="mypassword"/>
           <set-property
                 property="url"
                 value="jdbc:postgresql://localhost/mydatabase"/>
           <set-property
                 property="user"
                 value="myusername"/>
         </data-source>
</data-sources>

Answer 2

public ActionForward execute(
        ActionMapping mapping,
        ActionForm form,
        HttpServletRequest request,
        HttpServletResponse response)
        throws Exception
{
        DataSource dataSource;
        Connection cnn;        try
        {
                dataSource = getDataSource(request);
                cnn = dataSource.getConnection();
                // 数据连接已经建立了，你可以做你想做的事情了
        }
        catch (SQLException e)
        {
                getServlet().log("处理数据库连接", e);
        }
        finally
        {
                // 在finally块里包含这些代码
                // 用以保证连接最后会被关闭
                try
                {
                        cnn.close();
                }
                catch (SQLException e)
                {
                        getServlet().log("关闭数据库连接", e);
                }
        }
}

Answer 3

   dataSource = getDataSource(request); 
    这句我怎写了报错啊