如何刪除項目的本地數據庫

Question

如何刪除項目加入後

add("01:23:45:67:89:ac", "yes"); //add new item 


    static void add(string id, string input) 
    { 
     using (SqlCeConnection connection = new SqlCeConnection("datasource=base.sdf")) 
     { 
      connection.Open(); 
      try 
      { 
       using (SqlCeCommand command = new SqlCeCommand("INSERT INTO userinput VALUES(@macadres, @userinput)", connection)) 
       { 
        command.Parameters.Add(new SqlCeParameter("macadres", id)); 
        command.Parameters.Add(new SqlCeParameter("userinput", input)); 
        command.ExecuteNonQuery(); 
       } 
      } 
      catch 
      { 
       Console.WriteLine("Not OK."); 
      } 
      connection.Close(); 
     } 
    } 

需要刪除添加01本地數據庫：23：45：67：89：AC

DeleteRecord（「01:23： 45：67：89：AC「）;

static void DeleteRecord(string id) 
    { 
     using (SqlCeConnection connection = new SqlCeConnection("datasource=base.sdf")) 
     { 
      connection.Open(); 
      try 
      { 
       using (SqlCeCommand command = new SqlCeCommand("DELETE FROM userinput WHERE macadres ='" + id + "'")) 
       { 
        command.Connection.Open(); 
        command.ExecuteNonQuery(); 
       } 
      } 
      catch(Exception ex) 
      { 
       Console.WriteLine(ex.Message); 
      } 
      connection.Close(); 
     } 
    } 

Answer 1

DeleteRecord("01:23:45:67:89:ac"); 

    static void DeleteRecord(string id) 
    { 
     using (SqlCeConnection connection = new SqlCeConnection("datasource=base.sdf")) 
     { 
      connection.Open(); 
      try 
      { 
       using (SqlCeCommand command = new SqlCeCommand("DELTE FROM userinput WHERE macadres ='"+ id +"'", connection); 
       { 
        command.ExecuteNonQuery(); 
       } 
      } 
      catch 
      { 
       Console.WriteLine("Not OK."); 
      } 
      finally 
      { 
       connection.Close(); 
      } 

     } 
    } 

或者你可以創建一個方法，通過給連接和查詢作爲波紋管

string connectionstring = "datasource=base.sdf"; // "Data Source = MyDatabase.sdf; Password ='<pwd>'" 
string deleteQuery = "DELTE FROM userinput WHERE macadres ='"+ id +"'";  

可以調用的波紋管

MyExecuteNonQuery(deleteQuery , connectionstring); 

這裏，即該法刪除任何記錄implimentation

private void MyExecuteNonQuery(string queryString, 
     string connectionString) 
    { 
     SqlCeConnection conn = null; 
     try 
     { 
      conn = new SqlCeConnection(connectionString); 
      conn.Open(); 

      SqlCeCommand cmd = conn.CreateCommand(); 
      cmd.CommandText = queryString; 

      cmd.ExecuteNonQuery(); 
     } 
     finally 
     { 
      conn.Close(); 
     } 
    }