PHP/MySQL Insert Null Values
Inserting null values into a MySQL database can be tricky, especially if you're using outdated PHP functions like mysql_query().
When attempting to insert an array value of null using mysql_query(), you may encounter issues where null values aren't properly inserted, despite allowing them in the database.
Solution: Prepared Statements
To address this problem, consider using prepared statements instead. Prepared statements automatically handle null values correctly, eliminating the need for manual branching or additional logic.
In MySQL:
INSERT INTO table2 (f1, f2) VALUES ('String Value', NULL);
However, if you need to insert a non-null value, you'll still need to branch your code to add single quotes:
INSERT INTO table2 (f1, f2) VALUES ('String Value', 'String Value');
Using mysqli and Prepared Statements
Here's an example using MySQLi and prepared statements to handle null values:
<code class="php">$stmt = $mysqli->prepare("INSERT INTO table2 (f1, f2) VALUES (?, ?)");
$stmt->bind_param('ss', $field1, $field2);
$field1 = "String Value";
$field2 = null;
$stmt->execute();</code>
Prepared statements automatically escape fields, handle different types correctly, and prevent parameter-binding errors. They simplify the process and make handling null values in database insertions much easier.
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