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Sph 2026 03 21.01#58
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…SQL generation for EXISTS queries
- Introduced FromUnixEpochMicroseconds method for better clarity in converting microseconds to DateTime. - Updated GetInt64Value method to handle TIMESTAMP columns correctly. - Modified DataReader to return DateTime for TIMESTAMP columns using the new conversion method. - Added tests for TIMESTAMP columns to ensure correct metadata reporting and round-trip functionality. - Implemented DecentDBMaintenance class for database file maintenance, including an atomic vacuum operation. - Created DecentDB.NativeAssets.props for managing native asset paths across platforms. - Updated project files to include native assets conditionally based on build outputs. - Added comprehensive tests for maintenance operations to validate vacuum functionality. - Documented the changesets implementation plan for better versioning and release management.
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This pull request introduces significant improvements to the .NET ADO.NET binding for DecentDB, focusing on enhanced prepared statement caching, improved handling of native assets, and better support for data types. It also adds a new maintenance utility for database vacuuming. Below are the most important changes:
Prepared Statement Management and Command Execution:
DecentDBCommand, including logic to invalidate and reuse prepared statements when the SQL or connection changes, improving performance and correctness. Methods such asEnsurePreparedStatement,InvalidatePreparedStatement, and changes to property setters ensure the cache is properly managed. [1] [2] [3] [4] [5] [6] [7]ExecuteSingleNonQuery. [1] [2]Data Type Handling Improvements:
TIMESTAMPcolumns (type 17) and improved conversion forGuid,DateTime, andDateTimeOffsettypes inDecentDBDataReader. This includes new helper methods for consistent conversion from microseconds since Unix epoch and correct handling of BLOBs as GUIDs. [1] [2] [3] [4] [5] [6] [7] [8] [9] [10] [11] [12]Native Asset Packaging:
DecentDB.AdoNet.csprojto import a shared native assets property file and use MSBuild variables for runtime asset inclusion, making native library packaging more flexible and maintainable. [1] [2]Maintenance Utilities:
DecentDBMaintenanceproviding an async methodVacuumAtomicAsyncto perform an offline vacuum of a database file using the DecentDB CLI, with support for atomic file swapping and optional backup creation.These changes collectively improve the reliability, maintainability, and performance of the DecentDB .NET integration.