Java Migration of COBOL Table Search and SQL Operations

[devin-ai-integration]

Java Migration of COBOL Table Search and SQL Operations

Summary

This PR adds a complete Java implementation of the table search and SQL functionality from the existing COBOL codebase. The migration includes:

• Binary search table (BinarySearchTable) - Java equivalent of COBOL SEARCH ALL with multiple key support and O(log n) performance
• Sequential search table (SequentialSearchTable) - Java equivalent of COBOL SEARCH for unkeyed data with O(n) performance
• SQL operations (SQLTableOperations) - JDBC implementation of the three SQL search patterns from the COBOL examples
• Variable-length string handling (VariableLengthString) - Proper trimming and wildcard handling for SQL LIKE operations
• Complete test suite - 20 unit tests covering all search functionality
• Runnable examples - Interactive applications demonstrating both search types and SQL operations
• Database schema - PostgreSQL setup with sample data matching the COBOL examples

The Java implementation maintains the same performance characteristics and functionality as the original COBOL code while following modern Java best practices.

Review & Testing Checklist for Human

3 critical items to verify:

• Binary search logic correctness - Manually test the BinarySearchTable class with the same data as the COBOL examples to ensure searchByItemId1(), searchByAllKeys(), and searchByItemId3Descending() return identical results to the original COBOL SEARCH ALL operations
• SQL operations end-to-end testing - Set up PostgreSQL database using the provided schema, run the SQLExample application, and verify all three search patterns (all records, disabled accounts, LIKE queries) work correctly and return properly formatted results
• Variable-length string handling in SQL LIKE - Test the VariableLengthString.prepareForLikeQuery() method with various inputs including null, empty strings, and strings with trailing spaces to ensure SQL LIKE operations behave identically to the COBOL implementation

Notes

• All 20 unit tests pass, but the interactive examples require manual testing since they use Scanner input
• Database connection defaults to localhost:5432/cobol_db_example with postgres/password - may need adjustment for your environment
• The Maven build compiles successfully with Java 11+ and includes PostgreSQL JDBC driver

Link to Devin run: https://app.devin.ai/sessions/ee6062e6223f4f659fd9abc00f46fd8a
Requested by: @ibrahim-sowunmi

[devin-ai-integration]

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