feat: Add multi-statement transaction support #704
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Implement PEP 249-compliant transaction control with extensions for manual commit/rollback operations. This enables atomic multi-table operations with REPEATABLE_READ isolation semantics. Core API additions: - connection.autocommit property for enabling/disabling auto-commit mode - connection.commit() to commit active transactions - connection.rollback() to rollback active transactions - connection.get_transaction_isolation() returns current isolation level - connection.set_transaction_isolation() validates isolation level - TransactionError exception for transaction-specific failures Implementation details: - Added autocommit state caching in Session with optional server query - Added TRANSACTION_ISOLATION_LEVEL_REPEATABLE_READ constant - All transaction operations include proper error handling and telemetry - Supports fetch_autocommit_from_server connection parameter Testing: - Unit tests covering all transaction methods and error scenarios - e2e integration tests validating transaction behavior including multi-table atomicity, sequential transactions, and isolation semantics Documentation: - Comprehensive TRANSACTIONS.md guide with examples and best practices - Updated README.md with basic usage and reference to detailed docs Requires MST-enabled Databricks SQL warehouse and Delta tables with 'delta.feature.catalogOwned-preview' table property.
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What type of PR is this?
Description
Implement PEP 249-compliant transaction control with extensions for manual commit/rollback operations. This enables atomic multi-table operations with REPEATABLE_READ isolation semantics.
Core API additions:
Implementation details:
Testing:
Documentation:
Requires MST-enabled Databricks SQL warehouse and Delta tables with 'delta.feature.catalogOwned-preview' table property.
How is this tested?
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