What characters need to be escaped mysql?
I'm using MySQL API's function Show
Based on the documentation, it escapes the following characters:
Now, I looked into OWASP.org's ESAPI security library and in the Python port it had the following code (http://code.google.com/p/owasp-esapi-python/source/browse/esapi/codecs/mysql.py):
Now, I'm wondering whether all those characters are really needed to be escaped. I understand why % and _ are there, they are meta characters in LIKE operator, but I can't simply understand why did they add backspace and tabulator characters (\b \t)? Is there a security issue if you do a query:
Where user input contains tabulators or backspace characters? My question is here: Why did they include \b \t in the ESAPI security library? Are there any situations where you might need to escape those characters? 9.1.1 String Literals A string is a sequence of bytes or characters, enclosed within either single quote (
Quoted strings placed next to each other are concatenated to a single string. The following lines are equivalent:
If the
A binary string is a string of bytes. Every binary string has a character set and collation named For both types of strings, comparisons are based on the numeric values of the string unit. For binary strings, the unit is the byte; comparisons use numeric byte values. For nonbinary strings, the unit is the character and some character sets support multibyte characters; comparisons use numeric character code values. Character code ordering is a function of the string collation. (For more information, see Section 10.8.5, “The binary Collation Compared to _bin Collations”.) A character string literal may have an optional character set introducer and
Examples:
You can use
For information about these forms of string syntax, see Section 10.3.7, “The National Character Set”, and Section 10.3.8, “Character Set Introducers”. Within a string, certain sequences have special meaning unless the Table 9.1 Special Character Escape Sequences
The ASCII 26 character can be encoded as The There are several ways to include quote characters within a string:
The following
To insert binary data into a string column (such as a 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. You can do this in two ways:
What characters need to be escaped SQL?%, _, [, ], and ^ need to be escaped, and you will need to choose a suitable escape character, i.e. one that you aren't using elsewhere in your LIKE pattern.
Which character is the escape character for MySQL?Each of these sequences begins with a backslash ( \ ), known as the escape character. MySQL recognizes the escape sequences shown in Table 9.1, “Special Character Escape Sequences”. For all other escape sequences, backslash is ignored.
Do I need to escape in MySQL?The string data are required to escape before using in the select query to return the result set with a single quote (”), backslash (\), ASCII NULL, etc.
Which special characters are not allowed in MySQL?1 Answer. ASCII: [0-9,a-z,A-Z$_] (basic Latin letters, digits 0-9, dollar, underscore). Extended: U+0080 .. U+FFFF.. |