In the special case where you may want to store your apostrophes using their HTML entity references, PHP has the htmlspecialchars() function which will convert them to '. $stmt->bindParam(':note', $input_str, PDO::PARAM_STR) $sql = "INSERT INTO `table` (`note`) VALUES (:note)" sanitise it before writing to the DB (assumes PDO) Here's an example of using prepared statements and bound parameters in PHP: $input_str = "Here's a string with some apostrophes (')" In this article, we will focus on escaping characters withing a regular expression and show how it can be done in Java. To discover more, you can follow this article.
There are a couple of ways to do this, and you might want to read about SQL injection too. Overview The regular expressions API in Java, is widely used for pattern matching. Double quotes around column names are only necessary for column names that are otherwise ambiguous with SQL keywords such as DATE, NUMBER, COMMENT etc. data, whereas Strings surrounded by double quotes are identifiers, i.e. Possibly off-topic, but maybe you came here looking for a way to sanitise text input from an HTML form, so that when a user inputs the apostrophe character, it doesn't throw an error when you try to write the text to an SQL-based table in a DB. 1 Strings surrounded by Single quotes in SQL are string literals, i.e. Suppose, we have to print the following statement with double quotes: 'Java' is an object-oriented programming language. Why do we use escape characters Let's understand the uses of escape characters through the following example. You don't give much information about your constraints. In Java, there is a total of eight escape sequences that are described in the following table. Now if you also want to add choice of language, choice of SQL database and its non-standard quirks, and choice of query framework to the equation, then you might end up with a different choice. That says to me that using a doubled single-quote character is a better overall and long-term choice than using a backslash to escape the single-quote. However, use of \' creates security risks. The preferred, SQL-standard way to represent a quote mark is by doubling it ( '') but PostgreSQL has historically also accepted \'.
This controls whether a quote mark can be represented by \' in a string literal. I think the Postgres note on the backslash_quote (string) parameter is informative: Special Character Escape Sequences looks pretty similar.) Special Character Escape Sequences, and the current version is 5.6 - but the current Table 8.1. (Also, you linked to the MySQL 5.0 version of Table 8.1. It also says,Ī “ '” inside a string quoted with “ '” may be written as “ ''”. The MySQL documentation you cite actually says a little bit more than you mention.
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