fixing constraint

dbcon/postgresql.go

@@ -345,6 +345,9 @@ func generateSQLFromStorage(tableName string, columnAndValues interface{}) strin
 		}
 
 		argName := field.Tag.Get("sql-constraint")
+		if argName != "" {
+			argName = "constraint " + argName
+		}
 
 		keysName := field.Tag.Get("sql-keys")
 		if keysName == "" {
@@ -356,7 +359,7 @@ func generateSQLFromStorage(tableName string, columnAndValues interface{}) strin
 						argName = val
 					}
 				}
-				argName = fmt.Sprintf("%s_%s", keysName, argName)
+				argName = fmt.Sprintf("constraint %s_%s", keysName, argName)
 			}
 		}
 
@@ -365,5 +368,5 @@ func generateSQLFromStorage(tableName string, columnAndValues interface{}) strin
 
 	columnNamesStr := strings.Replace(strings.TrimRight(columnNames, ","), "DROP DATABASE", "", 1)
 
-	return fmt.Sprintf("'CREATE TABLE IF NOT EXISTS %s (%s)'", tableName, columnNamesStr)
+	return fmt.Sprintf("CREATE TABLE IF NOT EXISTS %s (%s);", tableName, columnNamesStr)
 }