PHP empty() function use with MySQL NULL

PHP provides a handy function, empty(), that is used to determine whether a variable is empty. Perhaps that is a bit confusing to someone unfamiliar with the empty() function and I can see how. In this blog post, I will cover: what empty() means in PHP, what the empty() function does, and a use case pairing up empty() with the PHP ternary operator conditional construct. Both used in combination with the MySQL NULL value. Continue reading and see examples of empty()

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PHP MySQL BLOB PDF: Display in Browser

In Use MySQL BLOB column with PHP to store .pdf file, I covered an example of how to store a .pdf file in the actual database table using the MySQL BLOB datatype and PHP. Now that we have .pdf’s stored in the database, how do we display them in the browser? This blog post answers that exact question. Continue reading to see a working example using PHP…

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Use MySQL BLOB column with PHP to store .pdf file

Like always I am sharing new things I learn here on my blog. I was recently working on a requirement for a LAMP stack web application reporting dashboard in which I needed to store – and eventually – retrieve a .pdf file. I have read in several places (this fantastic book is a great resource) that a viable option is storing images or documents (.pdf in this case) in the actual database table as opposed to on the server file system. MySQL has the BLOB datatype that can be used to store files such as .pdf, .jpg, .txt, and the like. In this blog post, I cover how I accomplished uploading and storing the actual .pdf file in a BLOB column in MySQL using PHP. Any corrections, tips, pointers, and recommendations for best practices are always welcome. We all learn as we go!!!

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MySQL DROP statement using phpMyAdmin

The MySQL DROP statement is one of many powerful DDL commands. Be it ALTER TABLE some_table DROP some_column or DROP some_table, this type of command can drastically change your data landscape because in executing MySQL DROP, you are completely removing objects from the database! If you are using the phpMyAdmin web interface, you can execute the MySQL DROP statement with just a few mouse clicks. Continue reading to see how…

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PHP PDO lastInsertId() method with examples in MySQL

MySQL has an AUTO_INCREMENT column attribute which automatically generates a consistent integer value upon a successful (or not) INSERT. Oftentimes, this attribute is set on a column deemed the PRIMARY KEY. Therefore, providing a unique value for the column and ensuring each rows’ individual identity. The LAST_INSERT_ID() function returns the most recently generated value for a column with the AUTO_INCREMENT attribute. Many times, you use this value further in query processing (E.g., link a newly signed-on customers’ information to a joining table of orders, ensure referential integrity between parent and child tables using a FOREIGN KEY and PRIMARY KEY, INSERT into another related one-to-one table, etc…). The PDO PHP library has a like-named class method, lastInsertId(), which provides the same functionality as LAST_INSERT_ID() in a PHP context. In this post, I’ll visit lastInsertId() with a simple example. Continue reading to learn more…

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