Fixed #

• CRITICAL: Eliminated heap corruption crashes on process exit
  • SQL Server: Exit code -1073740940 fully resolved (now exit code 0)
  • Oracle: Functional with known exit code issue (doesn't affect production)
  • Root cause: ODBC drivers retain internal references beyond disconnect()
  • Solution: Defer all resource cleanup to OS on process termination

Changed #

• Resource management: disconnect() and close() no longer actively free ODBC resources
  • Resources persist until process exit (~516 bytes per connection)
  • Prevents double-free and heap corruption issues
  • Ideal for singleton pattern in long-running servers

Memory Impact #

• ~516 bytes per connection retained until process exit
• Negligible for typical production use (1-10 permanent connections)
• Not recommended for applications creating/destroying 100+ dynamic connections

Documentation #

• Added docs/SOLUTION_v0.2.1_OPTION_A.md - Technical analysis
• Added docs/ORACLE_CONNECTION_ANALYSIS.md - Oracle-specific details
• Updated README with SQL Server and Oracle connection examples

Fixed #

• CRITICAL: Fixed heap corruption crashes under concurrent load
  • Exit code -1073740940 after 6+ concurrent requests
  • Solution: Environment handle persists for Odbc instance lifetime
  • Impact: 6+ concurrent connections validated without crashes
• CRITICAL: Fixed 90+ second deadlocks when closing connections
  • Removed SQLFreeHandle(SQL_HANDLE_ENV, _hEnv) from disconnect()
  • Impact: Instant disconnect (~10ms), 5+ sequential connections work
• Fixed race conditions in concurrent connection scenarios

Changed #

• Improved disconnect logic with double-disconnect protection
• Enhanced error handling with proper ODBC status code validation

Performance #

• Validated with 6 concurrent connections
• Average response time: 333ms
• No memory leaks or resource exhaustion

Added #

• Initial release
• SQL Server and Oracle support via ODBC
• Parameterized query support
• Connection management