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  • [.NET] Oracle Client Exception ORA01722

    最近的项目使用Oracle DB。在.NET里可以使用Oracle Client,来对Oracle DB下SQL指令。写了下面的程序代码,用来取得User数据表里的User数据。

    using (OracleConnection connection = new OracleConnection(connectionString))
    {
        connection.Open();
        using (OracleCommand command = new OracleCommand())
        {
            command.Connection = connection;
            command.Parameters.Add(":lastName", "Chou");
            command.Parameters.Add(":firstName", "Clark");
            command.CommandText = @"SELECT * FROM USER_DATA WHERE FIRST_NAME=:firstName AND LAST_NAME=:lastName";
    
            using (OracleDataReader reader = command.ExecuteReader())
            {
                while (reader.Read())
                {
                    // XXXXXXX
                }
                connection.Close();
            }
        }
    }
    

    快速打完、按下执行。却产生了让人摸不清头绪的错误例外「ORA-01722:无效的数字」。

    搞了半天才发现使用OracleCommand.Parameters来加参数是有顺序性的。在OracleCommand.CommandText里参数出现的顺序,必须要和OracleCommand.Parameters是一致的。也就是下列的程序代码才能正常执行:

    using (OracleConnection connection = new OracleConnection(connectionString))
    {
        connection.Open();
        using (OracleCommand command = new OracleCommand())
        {
            command.Connection = connection;
            command.Parameters.Add(":firstName", "Clark");
            command.Parameters.Add(":lastName", "Chou");        
            command.CommandText = @"SELECT * FROM USER_DATA WHERE FIRST_NAME=:firstName AND LAST_NAME=:lastName";
    
            using (OracleDataReader reader = command.ExecuteReader())
            {
                while (reader.Read())
                {
                    // XXXXXXX
                }
                connection.Close();
            }
        }
    }
    

    在网络上与朋友讨论这个问题与解法。经由Demo的提点,才知道原来只要将OracleCommand.BindByName设定为True就可以解决这个问题。范例程序如下:

    using (OracleConnection connection = new OracleConnection(connectionString))
    {
        connection.Open();
        using (OracleCommand command = new OracleCommand())
        {
            command.BindByName = true;
            command.Connection = connection;
            command.Parameters.Add(":lastName", "Chou");
            command.Parameters.Add(":firstName", "Clark");
            command.CommandText = @"SELECT * FROM USER_DATA WHERE FIRST_NAME=:firstName AND LAST_NAME=:lastName";
    
            using (OracleDataReader reader = command.ExecuteReader())
            {
                while (reader.Read())
                {
                    // XXXXXXX
                }
                connection.Close();
            }
        }
    }
    

    趁还有印象快速纪录一篇下来,为自己做个纪录,也希望能帮助到有需要的开发人员。 当然也要再次感谢Demo大大。:D


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  • 原文地址:https://www.cnblogs.com/clark159/p/2590081.html
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