How Can I Display Specific MySQL Error Messages for Long Queries with User Input in PHP?

Displaying MySQL Error for Long Queries with User Input in PHP

In PHP, executing lengthy MySQL queries dependent on user input can result in failures. However, the generic error message "Query Failed" provides insufficient information for troubleshooting. To display the specific error message, consider the following solutions:

Solution 1:

Modify your query execution line to include error handling:

mysqli_query($this->db_link, $query) or die(mysqli_error($this->db_link)); // Error handling added

Solution 2:

You can append the following line after the query execution:

if ($r == false)
    printf("error: %s\n", mysqli_errno($this->db_link));

Additional Notes:

• mysqli_query($this->db_link, $query) returns 0 if an error occurs.
• mysqli_error($this->db_link) provides the error message.
• Utilize error codes for further troubleshooting by using echo mysqli_errno($this->db_link);.
• Consult the PHP documentation for more information on mysqli_query and mysqli_error functions.

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