捕获 Oracle 超时异常答案

【问题标题】：Catch Oracle timeout exceptions捕获 Oracle 超时异常
【发布时间】：2012-02-08 10:47:59
【问题描述】：

我想以不同于其他 SQL 异常的方式处理超时异常，就像 How to catch SQLServer timeout exceptions

但是，我们的应用程序同时支持 Oracle 和 MSSqlserver。

理想情况下，该解决方案将涵盖两个提供程序：System.Data.OracleClient 和 Oracle.DataAccess.Client。

这些异常抛出的错误代码是什么？

【问题讨论】：

标签： .net database oracle timeout

【解决方案1】：

使用 void setQueryTimeout(int seconds) throws SQLException; 可能有效；但它可能会导致使用Oracle jdbc驱动程序执行的每个sql都创建线程，因此请谨慎使用。

/**
 * Sets the number of seconds the driver will wait for a 
 * <code>Statement</code> object to execute to the given number of seconds.
 * If the limit is exceeded, an <code>SQLException</code> is thrown. A JDBC
 * driver must apply this limit to the <code>execute</code>,
 * <code>executeQuery</code> and <code>executeUpdate</code> methods. JDBC driver
 * implementations may also apply this limit to <code>ResultSet</code> methods
 * (consult your driver vendor documentation for details).
 *
 * @param seconds the new query timeout limit in seconds; zero means 
 *        there is no limit
 * @exception SQLException if a database access error occurs, 
 * this method is called on a closed <code>Statement</code>
 *            or the condition seconds >= 0 is not satisfied
 * @see #getQueryTimeout
 */
void setQueryTimeout(int seconds) throws SQLException;

【讨论】：

我不是Java，设置超时不是问题。问题在于对超时做出反应。
非常抱歉，我的错，我没有注意到 .Net 部分

【解决方案2】：

我最终得到的结果与此类似：

但是，TimeOut 的错误代码似乎是 01013

    /// <summary>
    ///     Catches network problems for oracle connections and clears the session pool of invalid connections
    /// </summary>
    /// <param name="ex"></param>
    /// <param name="triedBefore"></param>
    /// <returns></returns>
    private bool reconnectOracle(DbException ex)
    {
        var exType = ex.GetType();
        if (exType.FullName == "Oracle.DataAccess.Client.OracleException")
        {
            dynamic exOra = ex;
            int errorNo = exOra.Number;
            // Check for oracle network error numbers
            if (errorNo == 03113 ||
                errorNo == 03114 || 
                errorNo == 03135) // **Timeout seems to be 01013**
            {
                AL.Warn("Connection is broken. Error number: {0}. Attempting reconnect.", errorNo);
                // Network error, close connection
                Command.Connection.Close();

                // All connections in the pool are probably invalid. Ensure that all connections are cleared
                dynamic con = new StaticMembersDynamicWrapper(Command.Connection.GetType());
                con.ClearAllPools();

                // Ensure that new connection object is given
                Command.Connection = null;

                return true;
            }
        }
        return false;
    }

StaticMembersDynamicWrapper 解释如下：http://blogs.msdn.com/b/davidebb/archive/2009/10/23/using-c-dynamic-to-call-static-members.aspx

我不想硬引用 Oracle 程序集，所以我改用它。

【讨论】：