kysely-converter
Capable of converting raw SQL queries into type-safe Kysely TypeScript code. Knows how to handle various SQL dialects and complex query structures.
What this skill does
# Kysely Converter Capabilities This agent is capable of transforming SQL queries into idiomatic Kysely TypeScript code. It understands SQL syntax and maps it to the corresponding Kysely query builder methods. ## Core Capabilities - **SQL Parsing**: Understands raw SQL structure including CTEs, subqueries, and complex clauses. - **Kysely API Mapping**: Maps SQL keywords and clauses to specific Kysely methods (e.g., `SELECT` -> `.select()`, `WHERE` -> `.where()`). - **Type-Safe Construction**: Generates code that utilizes Kysely's type inference capabilities. - **Dialect Handling**: Adapts conversion strategies for specific SQL dialects (PostgreSQL, MySQL). ## Supported Query Types ### SELECT Queries - **Column Selection**: Capable of selecting specific columns, all columns (`*`), and handling table prefixes. - **Aliasing**: Handles column and table aliases using `as` syntax. - **Distinct**: Supports `DISTINCT` and PostgreSQL-specific `DISTINCT ON`. - **Joins**: Converts `INNER JOIN`, `LEFT JOIN`, `RIGHT JOIN`, and other join types with complex `ON` conditions. - **Filtering**: - Handles basic comparison operators (`=`, `>`, `<`, etc.). - Supports complex boolean logic (`AND`, `OR`) using expression builders. - Manages `NULL` checks (`IS NULL`, `IS NOT NULL`). - Handles `IN` clauses and pattern matching (`LIKE`). - **Aggregation**: Converts `GROUP BY` and `HAVING` clauses with aggregate functions (`COUNT`, `SUM`, `AVG`, `MAX`, `MIN`). - **Ordering & Pagination**: Maps `ORDER BY` (asc/desc), `LIMIT`, and `OFFSET`. ### INSERT Operations - **Single & Batch Insert**: Can convert single-row and multi-row value insertions. - **Return Values**: Handles `RETURNING` clauses for PostgreSQL to return inserted data. ### UPDATE Operations - **Set Clauses**: Converts `SET` assignments for simple values and expressions (e.g., incrementing a counter). - **Complex Updates**: Supports updates involving subqueries or complex `WHERE` conditions. ### DELETE Operations - **Basic Deletion**: Maps standard `DELETE FROM` statements with conditions. - **Return Values**: Handles `RETURNING` clauses for deleted rows (PostgreSQL). ## Advanced Features ### Window Functions - **Ranking Functions**: `ROW_NUMBER`, `RANK`, `DENSE_RANK`, `NTILE`, `PERCENT_RANK`, `CUME_DIST`. - **Value Functions**: `LAG`, `LEAD`, `FIRST_VALUE`, `LAST_VALUE`, `NTH_VALUE`. - **Aggregate Windows**: Windowed versions of `AVG`, `COUNT`, `MAX`, `MIN`, `SUM`. - **Window Clauses**: Correctly constructs `OVER` clauses with `PARTITION BY`, `ORDER BY`, and frame specifications using the Kysely expression builder (`eb.fn.agg`). ### Expressions & Logic - **CASE Statements**: Converts `CASE WHEN ... THEN ... ELSE` logic into Kysely's `eb.case()` chain. - **Raw SQL**: Identifies when `sql` template tags are needed for unsupported or complex raw fragments. ## Reference Patterns The agent applies specific patterns found in the `references/` directory: - `select.md`: Query structure and clause mapping. - `insert.md`: Insertion patterns and return value handling. - `update.md`: Update logic and assignment expressions. - `delete.md`: Deletion mapping. - `window_function.md`: Complex window function construction using the expression builder.
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