FIX: Invalid check for database in connection string in _bulkcopy

[subrata-ms]

AB#42753

GitHub Issue: #442

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Summary

This pull request updates the bulk copy functionality to make the DATABASE parameter in the connection string optional, aligning behavior with SQL Server's default handling. It also adds a new test to ensure this works as expected. The most important changes are:

Bulk copy connection string handling:

• Modified the _bulkcopy method in cursor.py to remove the requirement for the DATABASE parameter in the connection string; now, bulk copy will proceed as long as a server is specified, and the server will use the default database if none is provided.

Testing improvements:

• Added a new test, test_bulkcopy_without_database_parameter, in test_019_bulkcopy.py to verify that bulk copy works correctly when the DATABASE parameter is omitted, ensuring the client connects to the default database and data is inserted as expected.

[github-actions]

📊 Code Coverage Report

🔥 Diff Coverage 100%

🎯 Overall Coverage 76%

📈 Total Lines Covered: 5520 out of 7185 📁 Project: mssql-python

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Diff Coverage

Diff: main...HEAD, staged and unstaged changes

No lines with coverage information in this diff.

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📋 Files Needing Attention

📉 Files with overall lowest coverage (click to expand)

mssql_python.pybind.logger_bridge.hpp: 58.8%
mssql_python.pybind.logger_bridge.cpp: 59.2%
mssql_python.row.py: 66.2%
mssql_python.pybind.ddbc_bindings.cpp: 69.4%
mssql_python.pybind.ddbc_bindings.h: 69.7%
mssql_python.pybind.connection.connection.cpp: 75.3%
mssql_python.ddbc_bindings.py: 79.6%
mssql_python.pybind.connection.connection_pool.cpp: 79.6%
mssql_python.cursor.py: 84.7%
mssql_python.__init__.py: 84.9%

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[Copilot]

Pull request overview

Updates bulk copy connection-string validation so DATABASE is no longer required, matching SQL Server’s default-database behavior, and adds tests to validate bulk copy behavior when DATABASE is omitted.

Changes:

• Remove the _bulkcopy() hard requirement that DATABASE be present in the connection string.
• Add an integration test validating bulk copy works when DATABASE is omitted.
• Add tests around SERVER parameter handling (including synonyms and missing-server failure).

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 2 comments.

File	Description
mssql_python/cursor.py	Removes the DATABASE-required guard; keeps a guard ensuring some server key is present before starting py-core bulk copy.
tests/test_019_bulkcopy.py	Adds new bulk copy integration tests for missing DATABASE, server-key synonyms, and missing server failure behavior.

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