In PHP, using PDO (PHP Data Objects) for database operations, a proper error handling mechanism is a crucial part to ensure program stability and debugging efficiency. PDO provides various error handling modes to help developers respond more flexibly to errors during database operations. This article focuses on how to combine the use of PDO::errorCode and PDO::setAttribute functions to adjust PDO's error handling modes for more efficient error management.

When developing web applications, database query operations are frequently used. However, when interacting with databases using PHP’s PDO, many beginners simply return a generic “Query failed” message when a query fails. This does not provide a clear problem description or any effective information for subsequent processing.

When using PHP's PDO (PHP Data Objects) for database operations, the PDO::errorCode() method returns '00000' to indicate no errors occurred. This may seem to suggest the operation completed successfully, but in reality, a '00000' return value from errorCode does not always accurately reflect the true outcome of the operation.