c# - Uni Objects .NET 运行查询并获取结果集

Question

我一直在玩弄 UniObjects .NET。

我希望能够运行 SELECT 查询并将数据放入可以运行数据的表单中。

我一直在使用的文档位于 http://www.rocketsoftware.com/u2/products/universe/resources/technical-manuals/universe-v11r1/uonet-v11r1.pdf

我目前正在使用

运行查询

            // UniCommans is a new instance of the CreateUniCommand() method
            UniCommand cmd = us1.CreateUniCommand();

            string UVDatabaseName = "SLCUST";

            // Command is the query that will be sent to the server to be rum
            cmd.Command = "SELECT " + UVDatabaseName + " USING DICT " + UVDatabaseName + " WITH CUSREF PRICECODE";

但我不知道如何将数据放入他们提供的一种数据类型对象中:

• UniDynArray
• 统一文件

• UniSelectList

          // OpenSession is used to open a new session to the database
          us1 = UniObjects.OpenSession("92.0.0.1", "username", "password", "/path/TOFILE", "uvcs");
  
          // Create new instance a UniCommand
          UniCommand cmd = us1.CreateUniCommand();
  
          string UVDatabaseName = "SLCUST";
  
          // Command is the query that will be sent to the server to be run
          cmd.Command = "SELECT " + UVDatabaseName + " USING DICT " + UVDatabaseName + " WITH CUSREF PRICECODE";
  
          // Buffer size for receiving data can be get/set using CommandBlockSize
          // 0 is unlimited, the full data set will be received
          cmd.CommandBlockSize = 0;
  
          // Execute() executes the Command on the server
          cmd.Execute();
  
          // A status response is returned as a string in Response
          string response_str = cmd.Response;
  
          Console.WriteLine(response_str);
  
          // Check for the response of the UniCommand
          // UVS_COMPLETE = The command was completed, or unsuccessful
          if (cmd.CommandStatus == UniObjectsTokens.UVS_COMPLETE)
          {
  
  
              // How do I loop through the data set from my query?
  
  
  
          }
  

我发现我可以使用以下代码遍历整个表:

// Create a Uni file, required for you can use a database file
UniFile custfile = us1.CreateUniFile("SLCUST");

// Create a select list from the ID returned from cmd.Response;
UniSelectList selectList = us1.CreateUniSelectList(0);

selectList.Select(custfile);


bool lLastRecord = selectList.LastRecordRead;

while (!lLastRecord)
{
    string s = selectList.Next();
    Console.WriteLine("Record ID:" + s);
    lLastRecord = selectList.LastRecordRead;
}

当我运行命令时，我得到以下响应字符串

4665 record(s) selected to SELECT list #0

这只是访问列表“0”的方式，我已经尝试过，但它是如何将它按摩到正确的类类型中:

UniSelectList selectList = us1.CreateUniSelectList(0);

Answer 1

你越来越近了。默认情况下，“SELECT”命令将生成一个键列表到选择列表 0 中。所以你只需要为它分配一个 UniSelectList 对象。你实际上并不想查看命令响应，除非你想检查命令是否产生错误:

 // OpenSession is used to open a new session to the database
    us1 = UniObjects.OpenSession("92.0.0.1", "username", "password", "/path/TOFILE", "uvcs");

    // Create new instance a UniCommand
    UniCommand cmd = us1.CreateUniCommand();

    string UVDatabaseName = "SLCUST";

    // Command is the query that will be sent to the server to be run
    cmd.Command = "SELECT " + UVDatabaseName + " USING DICT " + UVDatabaseName + " WITH CUSREF PRICECODE";

    UniSelectList uSelect = uSession.selectList (0);
    // Execute() executes the Command on the server
    cmd.Execute();

    while (!lLastRecord)
    {
      string s = uSelect.Next();
      Console.WriteLine("Record ID:" + s);
      lLastRecord = selectList.LastRecordRead;
    }