I write code in MVC structure and build feature upload pdf file to database(phpmyadmin) but I can’t upload file to my database.
Without any code, this is going to be extremely hard to diagnose.
Uploading a PDF to a MySQL database would have to be done as a blob. This however, can bloat your database extremely quickly. It could be good to upload the PDF to a filesystem instead if you are looking for performance. This post on stack overflow may be a good read for your scenario Stack Overflow MySQL Blob. However, the link that they posted has broken but you can find it here Storage Sizes Blob.
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