How Can I Convert an Integer to a Bit Data Type in MySQL 5.1?

MySQL: Casting Integer to Bit in 5.1

Converting an integer to a bit data type can be challenging in MySQL 5.1. While the CAST or CONVERT functions are commonly used for type conversions, they do not support casting integers to bits.

Method:

Since native casting is not possible, a custom function can be created to perform this conversion.

<code class="sql">DELIMITER $$

CREATE FUNCTION cast_to_bit (N INT) RETURNS bit(1)
BEGIN
    RETURN N;
END
$$</code>

This function returns the integer value as a bit(1) type.

Usage:

To use the function, create a view with various conversions:

<code class="sql">CREATE VIEW view_bit AS
    SELECT
        cast_to_bit(0),
        cast_to_bit(1),
        cast_to_bit(FALSE),
        cast_to_bit(TRUE),
        cast_to_bit(b'0'),
        cast_to_bit(b'1'),
        cast_to_bit(2=3),
        cast_to_bit(2=2)</code>

Now, all columns in the view will be of type bit(1).

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