Learn common patterns of using LIKE with PreparedStatements while using unit tests to demonstrate what works, what does not, and how to handle edge cases correctly.

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PreparedStatements with SQL LIKE operators require careful handling of wildcard characters. The simplest approach is concatenating wildcards (%, _) directly to parameter values before binding. Alternatively, SQL's CONCAT() function can handle wildcards database-side. When search keywords contain literal wildcard characters, they must be escaped using a custom escape character (like '!') and declared with the ESCAPE clause to prevent unintended pattern matching. The article demonstrates these patterns through H2 database integration tests, showing correct and incorrect implementations.

Using “LIKE” Wildcards in Java PreparedStatements

3. Adding Wildcard Characters to Parameters

5. When the Keyword Contains Wildcard Characters