Why does PDO insert 1 into a bit(1) column when given 0?

PDO Statement Insertion Conundrum: Understanding Binary Field Woes

In the world of database interactions, utilizing PDO prepared statements is a common practice to ensure data security and efficiency. However, when encountering binary fields like bit(1), a puzzling issue arises. Inserting the value 0 into such a field often results in a mysterious 1 appearing in the table.

This anomaly stems from the binary nature of the bit(1) column type in MySQL. Despite being categorized as a numeric type, it acts as a binary type in reality, causing compatibility issues with client libraries like PDO.

To circumvent this problem, a more reliable approach is to alter the column type to TINYINT(1). While both BIT(1) and TINYINT(1) consume a full byte of storage space per row, the latter ensures smoother compatibility with client libraries.

Experimenting with various type hints and modifiers can also yield positive results. Consider modifying the PDO code to bind the TestBool parameter with a type hint of PARAM_INT, as shown below:

$pdo = new PDO("connection string etc");
$statement = $pdo->prepare('INSERT INTO `test` (SomeText,TestBool) VALUES (:someText,:testBool)');
$statement->bindValue(':someText', "TEST");
$statement->bindValue(':testBool', 0, PDO::PARAM_INT);
$statement->execute();

Remember, while workarounds like these might solve the issue temporarily, switching to TINYINT(1) is strongly recommended to prevent future compatibility snags.

The above is the detailed content of Why does PDO insert 1 into a bit(1) column when given 0?. For more information, please follow other related articles on the PHP Chinese website!