Implement new OrderByAsc(col) and OrderByDesc(col) methods for
SelectBuilder, UnionBuilder, UpdateBuilder, and DeleteBuilder. These
methods allow chaining multiple ORDER BY columns with different sort
directions, addressing the limitation where the old OrderBy/Asc/Desc
pattern could only apply a single direction to all columns.
Key changes:
- Add OrderByAsc(col string) and OrderByDesc(col string) to all four builders
- Each method appends the column with explicit ASC/DESC suffix
- Support chaining for complex ordering: OrderByDesc("score").OrderByAsc("name")
- Deprecate OrderBy/Asc/Desc methods with clear migration guidance
- Add comprehensive tests (TestSelectBuilder_OrderByAscDesc)
- Add example functions demonstrating usage
- Update all existing examples to use new API
- Update README.md with new "Build ORDER BY clause" section
This design is inspired by MyBatis-Plus and provides a more intuitive
and flexible API for handling multiple ORDER BY columns with different
sorting directions.
fix#214
zeekay
Huan Du