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Equivalent function of mysql_real_escape_string() in C#

By , 25 Oct 2012
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Introduction

Implement function in C# to emulate functionality of mysql_real_escape_string() C API function.

Background 

When writing application programs, any string that might contain any of these special characters must be properly escaped before the string is used as a data value in an SQL statement that is sent to the MySQL server.

MySQL Reference: Special Character Escape Sequences

Using the code 

string SQL = string.Format("SELECT * FROM Users WHERE UserName='{0}' AND Password='{1}'", MySQLEscape(Username), MySQLEscape(Password));
MySqlCommand cmd = new MySqlCommand(SQL, this.connection);

private static string MySQLEscape(string str)
{
    return Regex.Replace(str, @"[\x00'""\b\n\r\t\cZ\\%_]",
        delegate(Match match)
        {
            string v = match.Value;
            switch (v)
            {
                case "\x00":            // ASCII NUL (0x00) character
                    return "\\0";   
                case "\b":              // BACKSPACE character
                    return "\\b";
                case "\n":              // NEWLINE (linefeed) character
                    return "\\n";
                case "\r":              // CARRIAGE RETURN character
                    return "\\r";
                case "\t":              // TAB
                    return "\\t";
                case "\u001A":          // Ctrl-Z
                    return "\\Z";
                default:
                    return "\\" + v;
            }
        });
} 

Interesting

A straightforward, though error-prone, way to prevent SQL injections is to escape characters that have a special meaning in SQL.

License

This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

About the Author

Member 3783976

United States United States
No Biography provided

Comments and Discussions

 
SuggestionAlternative solution Pinmemberjmarchaud23-Jul-13 22:28 
Questionback slach Pinmemberoumdaa25-Dec-12 0:37 

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