Add SQLite compatibility to wp db commands

[Copilot]

Add SQLite compatibility to wp db commands

This PR implements SQLite support for database commands when using the SQLite Database Integration plugin. Commands now detect SQLite via DB_ENGINE constant, SQLITE_DB_DROPIN_VERSION, or db.php drop-in inspection.

Changes

• New DB_Command_SQLite trait - Isolated SQLite operations using PDO:

  • create/drop/reset - File-based database lifecycle with sqlite3 binary
  • query - Direct PDO execution with formatted output (now supports --skip-column-names)
  • export/import - SQL dump/restore with proper identifier escaping
  • size - File size calculation
  • Database path resolution supporting FQDB, FQDBDIR, DB_FILE constants

• Modified DB_Command methods - Detect SQLite and route accordingly:

  • create, drop, reset, query, export, import - Full SQLite implementation
  • size - SQLite file size vs MySQL information_schema query
  • check, optimize, repair, cli - Warning messages (not applicable to SQLite)
  • tables, prefix, columns, search, clean - Unchanged (work via $wpdb)

• Test scenarios - Updated to support SQLite for --skip-column-names flag

• Documentation (README.md) - Supported commands, configuration, detection methods

Security Updates

• Fixed command injection vulnerabilities: All sqlite3 CLI commands now use Utils\esc_cmd to properly escape arguments
• Added sqlite3 binary check: Preflight validation with clear error messages if sqlite3 is not installed

Recent Updates

• Added --skip-column-names support for SQLite: The sqlite_query() method now accepts $assoc_args and respects the --skip-column-names flag
• Replaced custom display_table() with Formatter class: Using the standard WP-CLI Formatter class for consistency with other commands
• Updated tests: Removed MySQL-only restriction from --skip-column-names test as SQLite now supports it

Example Usage

# Works automatically when SQLite is detected
wp db query "SELECT * FROM wp_posts"
wp db query "SELECT * FROM wp_posts" --skip-column-names
wp db export backup.sql
wp db size

Technical Notes

• Requires sqlite3 CLI binary for create/drop/reset/export/import operations
• PDO used for query execution, enabling functionality at after_wp_config_load stage
• SQLite identifiers escaped with double-quotes, values via PDO::quote()
• Default database path: wp-content/database/.ht.sqlite
• Full backward compatibility - MySQL/MariaDB code paths unchanged
• Uses WP-CLI Formatter class for query output formatting
• All shell commands properly escaped using Utils\esc_cmd

Fixes #234

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[codecov]

Codecov Report

❌ Patch coverage is 14.76923% with 277 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
src/DB_Command_SQLite.php	4.06%	236 Missing ⚠️
src/DB_Command.php	48.10%	41 Missing ⚠️

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