Inserting null values into a MySQL database can be tricky, especially if you're using outdated PHP functions like mysql_query().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.
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');
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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