changed the way how to quote schemas, tables and field names,

added escaping table names in insert/update/remove

removed methods from BaseExpression:
virtual void before_short_field_name();
virtual void after_short_field_name();
virtual void before_first_part_long_field_name();
virtual void after_first_part_long_field_name();
virtual void before_second_part_long_field_name();
virtual void after_second_part_long_field_name();

added methods to BaseExpression:
virtual void schema_table_separator();
virtual void table_field_separator();
virtual void before_schema_name();
virtual void after_schema_name();
virtual void before_table_name();
virtual void after_table_name();
virtual void before_field_name();
virtual void after_field_name();

src/dbexpression.cpp

@@ -182,6 +182,54 @@ void DbExpression::put_name_value_separator()
 }
 
 
+void DbExpression::schema_table_separator()
+{
+	(*out_stream) << '.';
+}
+
+
+void DbExpression::table_field_separator()
+{
+	(*out_stream) << '.';
+}
+
+
+void DbExpression::before_schema_name()
+{
+	(*out_stream) << '"';
+}
+
+
+void DbExpression::after_schema_name()
+{
+	(*out_stream) << '"';
+}
+
+
+void DbExpression::before_table_name()
+{
+	(*out_stream) << '"';
+}
+
+
+void DbExpression::after_table_name()
+{
+	(*out_stream) << '"';
+}
+
+
+void DbExpression::before_field_name()
+{
+	(*out_stream) << '"';
+}
+
+
+void DbExpression::after_field_name()
+{
+	(*out_stream) << '"';
+}
+
+
 
 void DbExpression::before_field_value_string(const FT & field_type)
 {