連接池已達到連接

Question

的最大數量這種方法會導致錯誤的文件，以充分與此錯誤：

Connection Pool has reached the maximum number of connections 

---

public static int IsValidPortalUser(string p_u, string p_p) { 
      int item = 0; 
      using (IfxConnection ifxConnection = new IfxConnection(DB_Connection.connectionString)) 
      { 
       IfxCommand ifxCommand = new IfxCommand(); 
       string str = DB_Connection.My_Decryption_2(p_p); 
       try 
       { 
        if (ifxConnection.State == 0) 
        { 
         ifxConnection.Open(); 
        } 
        DB_Connection.DBCmd = new IfxCommand(); 
        DB_Connection.DBCmd.Connection = ifxConnection; 
        DB_Connection.DBCmd.CommandText = "SELECT nvl(emp_num,0) FROM htoemp WHERE username = ? AND DECRYPT_CHAR(password, '78dfdf') = ? "; 
        DB_Connection.DBCmd.Parameters.Add("user_name", p_u); 
        DB_Connection.DBCmd.Parameters.Add("password", str); 

        IfxDataReader ifxDataReaders = ifxCommand.ExecuteReader(); 
        using (ifxDataReaders) 
        { 
         if (ifxDataReaders.Read()) 
         { 
          item = (int)ifxDataReaders[0]; 
         } 
         ifxDataReaders.Close(); 
        } 
       } 
       catch (ApplicationException applicationException) 
       { 
       } 
       ifxConnection.Close(); 
      } 
      return item; 
     } 

---

Error Message:Connection Pool has reached the maximum number of connections. Stack Trace : at IBM.Data.Informix.IfxConnectionPool.ReportOpenTimeOut() 
    at IBM.Data.Informix.IfxConnectionPool.Open(IfxConnection connection) 
    at IBM.Data.Informix.IfxConnPoolManager.Open(IfxConnection connection) 
    at IBM.Data.Informix.IfxConnection.Open() 
    at DB_Connection_s.DB_Connection.IsValidPortalUser(String p_u, String p_p) 
    at LoginSystem.LoginPage_ar.ValidateUser(String UserName, String Password) in H:\LoginSystem\LoginSystem\LoginPage_ar.aspx.cs:line 20 
    at LoginSystem.LoginPage_ar.ibtn_login_Click(Object sender, ImageClickEventArgs e) in H:\LoginSystem\LoginSystem\LoginPage_ar.aspx.cs:line 33 
    at System.Web.UI.WebControls.ImageButton.OnClick(ImageClickEventArgs e) 
    at System.Web.UI.WebControls.ImageButton.RaisePostBackEvent(String eventArgument) 
    at System.Web.UI.WebControls.ImageButton.System.Web.UI.IPostBackEventHandler.RaisePostBackEvent(String eventArgument) 
    at System.Web.UI.Page.RaisePostBackEvent(IPostBackEventHandler sourceControl, String eventArgument) 
    at System.Web.UI.Page.RaisePostBackEvent(NameValueCollection postData) 
    at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) 

現在我設定Max Pool Size=400代替Max Pool Size=200

並且直到現在沒有這種類型的錯誤，但我想知道爲什麼這種方法會導致這個問題。

Answer 1

這是一個在黑暗中實拍，所以，讓我知道，如果有新的變化

public static int IsValidPortalUser(string p_u, string p_p) 
{ 
    int item = 0; 
    using (IfxConnection ifxConnection = new IfxConnection(DB_Connection.connectionString)) 
    { 
     IfxCommand ifxCommand = new IfxCommand(); 
     string str = DB_Connection.My_Decryption_2(p_p); 
     try 
     { 
      if (ifxConnection.State == 0) 
       ifxConnection.Open(); 
      ifxCommand.Connection = idxConnection; 
      ifxCommand.CommandText = "SELECT nvl(emp_num,0) FROM htoemp WHERE username = ? 
             AND DECRYPT_CHAR(password, '78dfdf') = ? "; 
      ifxCommand.Parameters.AddWithValue("user_name", p_u); 
      ifxCommand.Parameters.AddWithValue("password", str); 
      IfxDataReader ifxDataReaders = ifxCommand.ExecuteReader(); 
      using (ifxDataReaders) 
      { 
       if (ifxDataReaders.Read()) 
       { 
        item = (int)ifxDataReaders[0]; 
       } 
       ifxDataReaders.Close(); 
      } 
     } 
    } 
    return item; 
} 

另外，根據您的Informix版本，字符串密碼是reserved keyword