How Can I Successfully Use LOAD_FILE to Populate a MySQL Blob?

Overcoming Challenges with LOAD_FILE for MySQL Blob Loading

While attempting to leverage LOAD_FILE to populate a MySQL blob, you encountered a lack of data being injected. To address this, let's delve into the specifics of how to utilize LOAD_FILE effectively.

According to MySQL documentation, LOAD_FILE reads file content into a string, which requires several prerequisites. The file must reside on the server host, be accessible with a full path, and adhere to the FILE privilege. Additionally, the file should be readable for all and remain below the max_allowed_packet size threshold. When secure_file_priv is set to a directory, the desired file must be within it.

For clarity, consider executing the following query:

UPDATE t
SET blob_col=LOAD_FILE('/tmp/picture')
WHERE>

Now, let's scrutinize your code and identify potential points of failure:

• Incomplete Path: Ensure you've provided the absolute path to the file.
• Permission Issues: Verify that your user possesses the appropriate FILE privilege.
• Empty Return Value: Check if LOAD_FILE returns NULL due to file inaccessibility.
• Alternative Query: Implement the query provided in the manual to eliminate potential code errors.

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