PDO で LIKE 演算子を使用して値を適切にバインドするにはどうすればよいですか?

Bind LIKE Values with PDO Extension

In database queries using the LIKE operator, it's crucial to properly bind values to prevent SQL injection attacks. When dealing with LIKE queries involving wildcard characters (% or _) at the end, understanding the appropriate binding technique is essential.

Let's consider the example query:

select wrd from tablename WHERE wrd LIKE '$partial%'

Here, we want to bind the variable $partial using PDO. The correct way to do this is:

select wrd from tablename WHERE wrd LIKE :partial

where :partial is bound to $partial with the value "somet%" (with the trailing wildcard). This ensures the query searches for words that match somet followed by any number of characters.

Alternatively, you could use:

SELECT wrd FROM tablename WHERE wrd LIKE CONCAT(:partial, '%')

to perform the wildcard concatenation in MySQL instead of the PDO statement.

However, if the partial word you're searching for might itself contain wildcard characters (% or _) or backslashes, additional escaping mechanisms may be necessary in the PDO preparation and parameter binding.

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