Add Autocommit Option to connect_to_mysql for Accurate Database Query Results

[arthurmf]

This pull request adds an autocommit parameter to the connect_to_mysql method, enabling users to toggle autocommit mode on MySQL connections. By setting autocommit=True, users can ensure the latest data changes in the database are reflected in their queries, solving an issue where cached results would appear even after data modifications.

Background

Some users have reported that query results returned by the Vanna application do not update immediately after data changes in the database. This is due to the default transaction behavior of MySQL when autocommit is set to False, which can lead to reading shadowed copies of data. The addition of the autocommit parameter provides a way to address this issue, allowing more accurate and timely data retrieval.

Changes Made

• Added an autocommit parameter to the connect_to_mysql function (default: False for backward compatibility).
• Updated the pymysql.connect function call to include autocommit=autocommit in the connection parameters.

Usage

Users can enable autocommit mode by calling:

connect_to_mysql(host='localhost', user='user', password='password', dbname='db', autocommit=True)

Enabling autocommit ensures that the database fetches the most up-to-date records, improving the reliability and consistency of query results within the Vanna application.

[llamapreview]

Auto Pull Request Review from LlamaPReview

1. Overview

1.1 PR Summary

• Business value and requirements alignment: This PR adds an autocommit parameter to the connect_to_mysql method, allowing users to toggle autocommit mode on MySQL connections. This addresses user-reported issues of stale data in query results, improving data accuracy and reliability.
• Key components modified: The primary component modified is the connect_to_mysql function in src/vanna/base/base.py.
• Impact assessment: The change impacts how data changes are reflected in query results, improving data consistency.
• System dependencies and integration impacts: No direct cross-component impacts are evident from the changes.

1.2 Architecture Changes

• System design modifications: No significant system design modifications.
• Component interactions: No changes to component interactions.
• Integration points: No changes to integration points.

2. Detailed Technical Analysis

2.1 Code Logic Deep-Dive

Core Logic Changes

src/vanna/base/base.py - connect_to_mysql

• Submitted PR Code:

  def connect_to_mysql(
      self,
      host: str = None,
      dbname: str = None,
      user: str = None,
      password: str = None,
      port: int = None,

• autocommit: bool = False,
  **kwargs
  

  ):

  try:
      import pymysql.cursors
  except ImportError:
      raise DependencyError(
          "You need to install required dependencies to execute this method,"
          " run command:
  

  pip install PyMySQL"
  )

  conn = None

  try:
  conn = pymysql.connect(
  host=host,
  user=user,
  password=password,
  database=dbname,
  port=port,
  cursorclass=pymysql.cursors.DictCursor,

•     autocommit=autocommit,
      **kwargs
  )
  

  except pymysql.Error as e:
  raise ValidationError(e)

  def run_sql_mysql(sql: str) -> Union[pd.DataFrame, None]:
  if conn:
  try:
  conn.ping(reconnect=True)
  cs = conn.cursor()

• Analysis:
  • The autocommit parameter is added to the connect_to_mysql function with a default value of False to ensure backward compatibility.
  • The pymysql.connect function call is updated to include autocommit=autocommit in the connection parameters.
  • This change ensures that users can enable autocommit mode to get the most up-to-date records from the database.
• LlamaPReview Suggested Improvements:

  def connect_to_mysql(
      self,
      host: str = None,
      dbname: str = None,
      user: str = None,
      password: str = None,
      port: int = None,
      autocommit: bool = False,
      **kwargs
  ):
  
      try:
          import pymysql.cursors
      except ImportError:
          raise DependencyError(
              "You need to install required dependencies to execute this method,"
              " run command: pip install PyMySQL"
          )
  
      conn = None
  
      try:
          conn = pymysql.connect(
              host=host,
              user=user,
              password=password,
              database=dbname,
              port=port,
              cursorclass=pymysql.cursors.DictCursor,
              autocommit=autocommit,
              **kwargs
          )
      except pymysql.Error as e:
          raise ValidationError(e)
  
      def run_sql_mysql(sql: str) -> Union[pd.DataFrame, None]:
          if conn:
              try:
                  conn.ping(reconnect=True)
                  cs = conn.cursor()

• Improvement rationale:
  • The suggested improvements maintain the original logic while including the autocommit parameter, ensuring that the database connection settings are updated correctly.
  • Technical benefits: Improved data consistency and reliability.
  • Business value: Enhanced user experience with accurate query results.
  • Risk assessment: Minimal risk as the change is backward compatible and well-contained.

2.2 Implementation Quality

• Code organization and structure:

  • The code is well-organized and modular, with clear separation of concerns.
  • The addition of the autocommit parameter is straightforward and maintains the function's readability.

• Error handling:

  • Exception handling is present for import errors and connection errors.
  • The use of ValidationError for connection errors is appropriate.

• Performance considerations:

  • The change does not introduce any significant performance overhead.
  • Autocommit mode may have performance implications depending on the use case, but this is generally acceptable for ensuring data consistency.

3. Critical Findings

3.1 Potential Issues

• 🔴 Critical Issues
  • Issue: None identified.
  • Impact: N/A
  • Recommendation: N/A

3.2 Code Quality Concerns

• Maintainability aspects:
  • The code is maintainable with clear documentation and modular structure.
• Readability issues:
  • No significant readability issues identified.
• Performance bottlenecks:
  • No performance bottlenecks identified.

4. Security Assessment

4.1 Security Considerations

• Data handling concerns:
  • The change does not introduce new security vulnerabilities. However, enabling autocommit mode could increase the risk of data inconsistencies if not managed properly.
• Input validation:
  • No new input validation is required for the autocommit parameter.

4.2 Vulnerability Analysis

• Potential security risks:
  • No potential security risks identified.
• Mitigation strategies:
  • Ensure proper management of autocommit mode to prevent data inconsistencies.
• Security testing requirements:
  • Validate that enabling autocommit mode does not introduce security vulnerabilities.

5. Testing Strategy

5.1 Test Coverage

• Unit test analysis:
  • Tests should cover enabling and disabling autocommit and validate data consistency.
• Integration test requirements:
  • Tests should validate the integration of the connect_to_mysql method with other components.
• Edge cases coverage:
  • Tests should cover different isolation levels and connection parameters.

5.2 Test Recommendations

Suggested Test Cases

def test_connect_to_mysql_autocommit_enabled(self):
    connection = connect_to_mysql(host='localhost', user='user', password='password', dbname='db', autocommit=True)
    # Validate that autocommit is enabled
    self.assertTrue(connection.autocommit)

def test_connect_to_mysql_autocommit_disabled(self):
    connection = connect_to_mysql(host='localhost', user='user', password='password', dbname='db', autocommit=False)
    # Validate that autocommit is disabled
    self.assertFalse(connection.autocommit)

def test_connect_to_mysql_default_autocommit(self):
    connection = connect_to_mysql(host='localhost', user='user', password='password', dbname='db')
    # Validate that autocommit is disabled by default
    self.assertFalse(connection.autocommit)

def test_connect_to_mysql_autocommit_with_other_params(self):
    connection = connect_to_mysql(host='localhost', user='user', password='password', dbname='db', port=3306, autocommit=True)
    # Validate that autocommit is enabled with other parameters
    self.assertTrue(connection.autocommit)

• Coverage improvements:
  • Ensure that the new parameter is covered in existing tests.
• Performance testing needs:
  • No significant performance benchmarks required for this change.

6. Documentation & Maintenance

• Documentation updates needed:
  • Update the project documentation to reflect the new autocommit parameter and its usage.
  • Add examples demonstrating how to use the autocommit parameter effectively.
• Long-term maintenance considerations:
  • The change is straightforward and should not introduce significant maintenance overhead.
• Technical debt and monitoring requirements:
  • Ensure comprehensive test coverage and documentation updates to minimize technical debt.

7. Deployment & Operations

• Deployment impact and strategy:
  • The change is backward compatible and should not impact existing deployments.
• Key operational considerations:
  • Improved error logging would aid in monitoring and debugging.

8. Summary & Recommendations

8.1 Key Action Items

1. Critical Changes Required:

   • None identified.

2. Important Improvements Suggested:

   • Ensure comprehensive test coverage for the new autocommit parameter.
   • Update the project documentation to reflect the new autocommit parameter and its usage.

3. Best Practices to Implement:

   • Improved error logging for better debugging and monitoring.

4. Cross-cutting Concerns to Address:

   • Validate the behavior of autocommit with different isolation levels and connection parameters.

8.2 Future Considerations

• Technical evolution path:
  • Consider providing more fine-grained control over transaction management if needed.
• Business capability evolution:
  • Enhanced user experience with accurate query results.
• System integration impacts:
  • No significant system integration impacts.

=== FINAL PR REVIEW COMMENT FORMAT ENDS ===