Index: driver/results.c
===================================================================
--- driver/results.c	(revision 1041)
+++ driver/results.c	(working copy)
@@ -341,6 +341,11 @@
           *((ulonglong *)rgbValue)= (ulonglong)strtoull(value, NULL, 10);
       *pcbValue= sizeof(ulonglong);
       break;
+
+    default:
+      return set_error(stmt,MYERR_07006,
+                       "Restricted data type attribute violation",0);
+      break;
     }
   }
 
@@ -1392,7 +1397,7 @@
                 if ( bind->rgbValue || bind->pcbValue )
                 {
                     SQLLEN offset,pcb_offset;
-                    SQLLEN pcbValue;
+                    SQLLEN pcbValue= 0;
 
                     if ( stmt->stmt_options.bind_type == SQL_BIND_BY_COLUMN )
                     {
@@ -1429,7 +1434,7 @@
                         else
                             res= SQL_ERROR;
                     }
-                    if (bind->pcbValue)
+                    else if (bind->pcbValue)
                       *(bind->pcbValue + (pcb_offset / sizeof(SQLLEN))) = pcbValue;
                 }
                 if ( lengths )
Index: test/my_types.c
===================================================================
--- test/my_types.c	(revision 1041)
+++ test/my_types.c	(working copy)
@@ -721,6 +721,23 @@
 }
 
 
+/*
+  Bug #31220 - SQLFetch or SQLFetchScroll returns negative data length
+               when using SQL_C_WCHAR
+*/
+DECLARE_TEST(t_bug31220)
+{
+  SQLLEN outlen= 999;
+  SQLWCHAR outbuf[5];
+  ok_sql(hstmt, "select 1");
+  ok_stmt(hstmt, SQLBindCol(hstmt, 1, SQL_C_WCHAR, outbuf, 5, &outlen));
+  expect_stmt(hstmt, SQLFetch(hstmt), SQL_ERROR);
+  is(check_sqlstate(hstmt, "07006") == OK);
+  is_num(outlen, 999);
+  return OK;  
+}
+
+
 BEGIN_TESTS
   ADD_TEST(t_longlong1)
   ADD_TEST(t_numeric)
@@ -736,6 +753,7 @@
   ADD_TEST(float_scale)
   ADD_TEST(bit)
   ADD_TEST(t_bug32171)
+  ADD_TEST(t_bug31220)
 END_TESTS