Error
Error Code:
3998
MySQL Error 3998: Invalid Data Type Cast
Description
Error 3998 indicates that MySQL encountered an issue while attempting to convert a value from one data type to another. This typically occurs when an explicit `CAST()` or `CONVERT()` function is used, or during implicit type conversion, and the source value cannot be validly represented in the target data type.
Error Message
Cannot cast value to %s.
Known Causes
3 known causesIncompatible Data Types
Attempting to cast a value from a data type that logically cannot be converted to the target data type (e.g., casting a non-numeric string like 'hello' to an integer).
Malformed Source Data
The source data itself is not in a valid format for the target data type, even if the types are generally compatible (e.g., trying to cast '2023-13-01' to a `DATE` type).
Implicit Conversion Failure
During `INSERT`, `UPDATE`, or comparison operations, MySQL implicitly tries to convert a value to fit the target data type, but the conversion fails due to an incompatibility.
Solutions
Coming SoonDetailed step-by-step solutions for this error are being prepared. In the meantime, try these general troubleshooting tips:
General Troubleshooting Tips
- Check the error message carefully for specific details
- Review recent changes that might have caused the error
- Search for the exact error code in the official documentation
- Check log files for additional context
- Try restarting the application or service