Why Does My PHP Code Throw a 'mysqli_sql_exception: No Index Used' Fatal Error?

mysqli_sql_exception: No Index Used

When you encounter the error "Fatal error: Uncaught exception 'mysqli_sql_exception' with message 'No index used in query/prepared statement'," it does not originate from MySQL. Instead, the fatal error lies within your PHP code.

Cause of Fatal Error

The error arises due to the following factors:

• mysqli Warning Triggers Exception: By setting mysqli_report(MYSQLI_REPORT_ALL), you trigger an exception for all MySQL warnings, including the harmless "No index used" warning.
• Uncaught Exception: Your PHP code lacks try{} and catch(){} blocks to handle exceptions appropriately. Uncaught exceptions are considered fatal in PHP.

Solution

To address this issue, you have two options:

Option 1: Adjust mysqli_report Settings

• Change mysqli_report(...) to MYSQLI_REPORT_STRICT or MYSQLI_REPORT_OFF to suppress all warnings except for fatal errors.
• Alternatively, use mysqli_report(MYSQLI_REPORT_ERROR | MYSQLI_REPORT_STRICT) to report only critical errors and strict warnings.

Option 2: Implement Exception Handling

• Enclose your code within try{} and catch(){} blocks to handle the mysqli_sql_exception properly. This allows you to handle the warning without causing a fatal error.

Additional Tips

• Use EXPLAIN before any queries to identify any potential missing indexes and improve performance.
• Optimize your database by creating appropriate indexes on frequently queried fields.

By implementing these solutions, you can eliminate the fatal error and ensure proper exception handling in your PHP code while addressing any underlying indexing issues in your database.

The above is the detailed content of Why Does My PHP Code Throw a 'mysqli_sql_exception: No Index Used' Fatal Error?. For more information, please follow other related articles on the PHP Chinese website!