檢查系統DSN並創建系統DSN（如果不存在）（i系列訪問ODBC驅動程序）

Question

有人可以幫助我嗎？ 我需要通過系統DSN檢查我的ODBC連接到AS400伺服器，並創建一個系統DSN，如果一個特定的不存在。 我試過Google搜索，一直沒能找到對我有好處的東西。

順便說一句，我是相當新的編程。任何幫助都感激不盡。 謝謝

Answer 1

經過網上提供的幾個較簡單的例子之後，這是我設法想出來的（它對我來說工作正常）。

using System; 
using System.Runtime.InteropServices; 

public class ODBC_Manager 
{ 
    [DllImport("ODBCCP32.dll")] 
    public static extern bool SQLConfigDataSource(IntPtr parent, int request, string driver, string attributes); 

    [DllImport("ODBCCP32.dll")] 
    public static extern int SQLGetPrivateProfileString(string lpszSection, string lpszEntry, string lpszDefault, string @RetBuffer, int cbRetBuffer, string lpszFilename); 

    private const short ODBC_ADD_DSN = 1; 
    private const short ODBC_CONFIG_DSN = 2; 
    private const short ODBC_REMOVE_DSN = 3; 
    private const short ODBC_ADD_SYS_DSN = 4; 
    private const short ODBC_CONFIG_SYS_DSN = 5; 
    private const short ODBC_REMOVE_SYS_DSN = 6; 
    private const int vbAPINull = 0; 

    public void CreateDSN(string strDSNName) 
    { 
     string strDriver; 
     string strAttributes; 

     try 
     { 
      string strDSN = ""; 

      string _server = //ip address of the server 
      string _user = //username 
      string _pass = //password 
      string _description = //not required. give a description if you want to 


      strDriver = "iSeries Access ODBC Driver"; 

      strAttributes = "DSN=" + strDSNName + "\0"; 
      strAttributes += "SYSTEM=" + _server + "\0"; 
      strAttributes += "UID=" + _user + "\0"; 
      strAttributes += "PWD=" + _pass + "\0"; 

      strDSN = strDSN + "System = " + _server + "\n"; 
      strDSN = strDSN + "Description = " + _description + "\n"; 

      if (SQLConfigDataSource((IntPtr)vbAPINull, ODBC_ADD_SYS_DSN, strDriver, strAttributes)) 
      { 
       Console.WriteLine("DSN was created successfully"); 
      } 
      else 
      { 
       Console.WriteLine("DSN creation failed..."); 
      } 
     } 
     catch (Exception ex) 
     { 
      if (ex.InnerException != null) 
      { 
       Console.WriteLine(ex.InnerException.ToString()); 
      } 
      else 
      { 
       Console.WriteLine(ex.Message.ToString()); 
      } 
     } 
    } 

    public int CheckForDSN(string strDSNName) 
    { 
     int iData; 
     string strRetBuff = ""; 
     iData = SQLGetPrivateProfileString("ODBC Data Sources", strDSNName, "", strRetBuff, 200, "odbc.ini"); 
     return iData; 
    } 
} 

...然後從您的應用程序調用方法。

static void Main(string[] args) 
{ 
    ODBC_Manager odbc = new ODBC_Manager(); 
    string dsnName = //Name of the DSN connection here 

    if (odbc.CheckForDSN(dsnName) > 0) 
    { 
     Console.WriteLine("\n\nODBC Connection " + dsnName + " already exists on the system"); 
    } 
    else 
    { 
     Console.WriteLine("\n\nODBC Connection " + dsnName + " does not exist on the system"); 
     Console.WriteLine("\n\nPress 'Y' to create the connection?"); 

     string cont = Console.ReadLine(); 
     if (cont == "Y" || cont == "y") 
     { 
      odbc.CreateDSN(dsnName); 
      Environment.Exit(1); 
     } 
     else 
     { 
      Environment.Exit(1); 
     } 
    } 
}