Table designer: Do not allow an empty length/set for data types which require one. See http://stackoverflow.com/questions/34315162/how-to-create-table-in-mariadb

out/locale/en/LC_MESSAGES/default.po

@@ -7,7 +7,7 @@ msgid ""
 msgstr ""
 "Project-Id-Version: HeidiSQL\n"
 "POT-Creation-Date: 2012-11-05 21:40\n"
-"PO-Revision-Date: 2015-12-16 19:21+0100\n"
+"PO-Revision-Date: 2015-12-20 12:02+0100\n"
 "Last-Translator: Ansgar Becker <anse@heidisql.com>\n"
 "Language-Team: English (http://www.transifex.com/projects/p/heidisql/"
 "language/en/)\n"
@@ -6183,3 +6183,6 @@ msgstr "Upper Case Block"
 
 msgid "Lower Case Block"
 msgstr "Lower Case Block"
+
+msgid "Column data type %s requires a length/set"
+msgstr "Column data type %s requires a length/set"

source/table_editor.pas

@@ -1175,9 +1175,11 @@ var
   i: Integer;
   Col: PTableColumn;
   Key: TTableKey;
+  WasModified: Boolean;
 begin
   // Column property edited
   Col := Sender.GetNodeData(Node);
+  WasModified := True;
   case Column of
     1: begin // Name of column
       for i:=0 to FColumns.Count-1 do begin
@@ -1227,8 +1229,13 @@ begin
 
     end; // Length / Set
     3: begin
-      Col.LengthSet := NewText;
-      Col.LengthCustomized := True;
+      if Col.DataType.RequiresLength and (NewText='') then begin
+        WasModified := False;
+        ErrorDialog(f_('Column data type %s requires a length/set', [Col.DataType.Name]));
+      end else begin
+        Col.LengthSet := NewText;
+        Col.LengthCustomized := True;
+      end;
     end;
     // 4 + 5 are checkboxes - handled in OnClick
     7: begin // Default value
@@ -1242,8 +1249,10 @@ begin
     10: Col.Expression := NewText;
     11: Col.Virtuality := NewText;
   end;
-  Col.Status := esModified;
-  Modification(Sender);
+  if WasModified then begin
+    Col.Status := esModified;
+    Modification(Sender);
+  end;
 end;