escape characters in SQL query string produced via string.format

I have the statement in c# :

String sql = String.Format("UPDATE Table SET FIRST_NAME='{0}',LAST_NAME='{1}',BIRTH_DATE='{2}' where CUSTOMER_NUMBER ='{3}'",FirstName, LastName,DateOfBirth,Number);

The above statement doesn't execute if the first name,last name etc have apostrophe like O'Hare,O'Callahagan because of this the update statement gets the wrong syntax.

How to escape the apostrophe in string.format?

How to escape the apostrophe in string.format?

Don't escape it, use parameterized query instead.

Imagine a user with a really unconventional name strongly resembling SQL statements for dropping a table or doing something equally malicious. Escaping quotes is not going to be of much help.

Use this query instead:

String sql = @"UPDATE Table
    SET FIRST_NAME=@FirstName
,   LAST_NAME=@LastName
,   BIRTH_DATE=@BirthDate
WHERE CUSTOMER_NUMBER =@CustomerNumber";

After that, set values of FirstName, LastName, DateOfBirth, and Number on the corresponding parameters:

SqlCommand command = new SqlCommand(sql, conn);
command.Parameters.AddWithValue("@FirstName", FirstName);
command.Parameters.AddWithValue("@LastName", LastName);
command.Parameters.AddWithValue("@BirthDate", BirthDate);
command.Parameters.AddWithValue("@CustomerNumber", CustomerNumber);

Your RDMBS driver will do everything else for you, protecting you from malicious exploits. As an added benefit, it would let you avoid issues when the date format of your RDBMS is different from your computer: since your date would no longer be passed as a string representation, there would be no issues understanding which part of the formatted date represents a day, and which one represents a month.

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Use parameterized query.

string commandString = "insert into MyTable values (@val1, @val2)";     
SqlCommand command = new SqlCommand(commandString, connection);
command.Parameters.AddWithValue("val1", "O'Hare");
command.Parameters.AddWithValue("val2", "O'Callahagan");
command.ExecuteNonQuery();

mysqljs/sqlstring: Simple SQL escape and format for MySQL, You can do so using the SqlString.escape() method: Alternatively, you can use ? characters as placeholders for values you would like to have escaped like this: You can use SqlString.format to prepare a query with multiple insertion points� The SQL String Inclusion of apostrophes (or single quotes) inside an SQL statement provides the following error returned from the database manager (for the name O’Dowd in this case): An escape character is needed, being a double apostrophe instead of a single one. Thus, O”Dowd is acceptable to the database.

SQL Server String Functions, This tutorial provides with many useful SQL Server String functions that allow FORMAT, Return a value formatted with the specified format and optional culture character with the specified integer code, as defined by the Unicode standard Escapes special characters in a string and returns a new string with escaped� One of my favorite SQL commands has been QUOTENAME. A common programming need when generating code is the need to surround a string value with quotes, and escape any characters that are the same as you are surrounding the string with, with doubles (and if you need doubles of the character in the string, you then need four of the characters.)

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Escape a SQL query string, Added by iNTERFACEWARE. How to correctly escape a SQL query string. Source Code. -- create connections once when channel starts� Well I am just inserting #1 into the database just like that, but then when I pull it back out via LINQ it is coming into the string with the '\r \t\t\t\t\t' etc. Then I have to do a Replace function on each of those escape characters so they are removed from my string. An example would be

Comments
  • Use parameterized SQL! dotnetperls.com/sqlparameter stackoverflow.com/questions/5468425/…
  • Try with next: stackoverflow.com/questions/11528122/…
  • I changed the entire structure of my program using parameters. That works thank you :)
  • @user1118468 You are welcome! If this works for you, consider accepting an answer by clicking the grey check mark next to it. This would let other visitors of the site know that you are no longer actively looking for an improved solution, and earn you a brand-new badge on Stack Overflow.
  • What if I am using SqlDataAdapter instead?
  • What I am wondering: Why would escaping quotes not be of much help when confronted with a malicious name like "Robert'); DROP TABLE Students;--"? I see no issue when escaping the single quote to 2 single quotes. The malicious DROP TABLE would be a string because of the escaping and would not execute.