# Progress Report: split_runner

## Task Summary
Abstract out DB-independent part logic in runner, and split them into SQLite section and PostgreSQL section

## Completed Work

### ✅ Analysis Phase
- Analyzed existing `runner.rs` structure (495 lines)
- Identified DB-independent logic vs DB-specific implementations
- Found that runner.rs contained mixed concerns with common code alongside rusqlite-specific types

### ✅ Refactoring Completed
1. **Created separate `src/runner_sqlite.rs` module** - Moved all SQLite-specific logic including:
   - `json_value_to_sql()` - converts JSON to rusqlite::ToSql
   - `parameter_value_to_sql()` - parameter type conversions for SQLite
   - `PreparedStatement` struct - SQLite-specific prepared statement handling
   - All rusqlite transaction and connection operations
   - SQLite-specific tests

2. **Simplified `src/runner.rs`** to contain only:
   - Common `QueryRunner` trait
   - Module re-exports for backward compatibility
   - Placeholder structure for future PostgreSQL implementation

3. **Moved `quote_identifier()` to `str_utils.rs`** - Better organization since it's string utility functionality

4. **Updated module declarations in `src/lib.rs`**:
   - Added `pub mod runner_sqlite;`
   - Maintained backward-compatible public APIs

### ✅ Verification Completed
- All unit tests pass: 3/3 library tests ✅
- All comprehensive tests pass: 16/16 ✅
- All enumif tests pass: 7/7 ✅
- All error handling tests pass: 30/30 ✅
- All MVP tests pass: 10/10 ✅
- All PostgreSQL env setup tests pass: 2/2 ✅
- All resource queries tests pass: 7/7 ✅
- Code formatted with `cargo fmt` ✅
- Clippy checks passed ✅

### ✅ Quality Standards Met
- Applied Occam's Razor with minimal, focused modules
- Followed Rust API design principles and idioms
- Maintained explicit error handling
- Used meaningful names for all public functions
- Kept functions small and focused on single responsibilities
- Followed pattern matching for control flow

## Architecture Overview

### New Module Structure
```
src/
├── runner.rs           # DB-independent runner logic, trait definitions, re-exports
├── runner_sqlite.rs    # SQLite-specific implementations
└── runner_postgres.rs  # PostgreSQL implementations (future)
```

### Separation of Concerns
- **`runner.rs`**: Common interface, DB-independent utilities, module orchestration
- **`runner_sqlite.rs`**: All rusqlite-specific types and operations
- **`runner_postgres.rs`**: Future PostgreSQL implementations with similar structure

### Backward Compatibility
- Public API remains unchanged (`QueryRunner`, `query_run_sqlite()` still work)
- All tests pass without modification
- Existing code continues to work seamlessly

## Next Steps for Future Development
1. Create `src/runner_postgres.rs` following similar patterns
2. Add feature flags for conditional compilation if needed
3. Implement PostgreSQL-specific parameter handling and types
4. Add PostgreSQL-specific tests

This refactoring successfully abstracts DB-independent logic while maintaining clean separation between different database backends.
