Get field length from entity field

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2 posts, 0 answers
  1. RICHARD FRIEND
    RICHARD FRIEND avatar
    16 posts
    Member since:
    Nov 2008

    Posted 06 May 2009 Link to this post

    Im trying to get the field length from an entity field with a user control that will be bound inside a FormView.

    Thus far i have the following, however im having trouble reflecting 

    OpenAccessEnhancedStateManager

    Any ideas or better approach..( maybe grab from config??)

    private static volatile IDictionary<Type, IDictionary<string, int>> oaMaxLenCache = new Dictionary<Type, IDictionary<string, int>>();  
            public static int GetOpenAccessMaxLength(Control cf,string fieldName)  
            {  
                int maxLen = -1;  
                IDataItemContainer nc = cf.NamingContainer as IDataItemContainer;  
                if (nc != null)  
                {  
                    object di = nc.DataItem;  
                    if (di != null)  
                    {  
                        Type t = di.GetType();  
                        if (!oaMaxLenCache.ContainsKey(t)) { oaMaxLenCache.Add(t, new Dictionary<string, int>()); }//Add dict for type  
                        if (oaMaxLenCache[t].ContainsKey(fieldName))  
                        {  
                            //Load from cache  
                            maxLen = oaMaxLenCache[t][fieldName];  
                        }  
                        else  
                        {  
                            PropertyInfo fi = t.GetProperty("OpenAccessEnhancedStateManager",BindingFlags.Public); //Doesnt get the property...?? not sure why  
                            if (fi != null)  
                            {  
                                OpenAccessRuntime.DataObjects.PCStateMan sm = (OpenAccessRuntime.DataObjects.PCStateMan)fi.GetValue(di,null);  
                                if (sm != null)  
                                {  
                                    OpenAccessRuntime.metadata.FieldMetaData stateField = sm.owner.stateFields.Where(m => m.name == fieldName).SingleOrDefault();  
                                    if (stateField != null)  
                                    {  
                                        OpenAccessRuntime.Relational.metadata.RelationalField fld = stateField.storeField as OpenAccessRuntime.Relational.metadata.RelationalField;  
                                        if (fld != null)  
                                        {  
                                            maxLen = fld.mainTableCols[0].length;  
                                            oaMaxLenCache[t].Add(fieldName, maxLen);//Store in cache  
                                        }  
                                    }  
     
                                }  
                            }  
                        }  
                    }  
                }  
                return maxLen;  
            } 
  3. Jan Blessenohl
    Admin
    Jan Blessenohl avatar
    707 posts

    Posted 06 May 2009 Link to this post

    Hi RICHARD FRIEND,
    Maybe you want to use this approach:

    ClassMetaData

     

    [] cmds = Telerik.OpenAccess.Debug.ModelHelper.GetModel(scope1);
    foreach

     

    (ClassMetaData cmd in cmds)
    {
        Console.WriteLine("Class: " + cmd.Namespace + "." + cmd.Name);
        foreach (FieldMetaData fmd in cmd.GetFields())
            Console.WriteLine(" Field: " + fmd.Name + "(" + fmd.ColumnName + "(" + fmd.Length + "))");
    }

     

    You have to link against Telerik.OpenAccess.Runtime

    All the best,
    Jan Blessenohl
    the Telerik team

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