At 21:11 -0500 11/10/04, Michael Stassen wrote:
Toro Hill wrote:
Hi all.
I have question about how the function quote() works with NULL
values. Here is what the mysql manual say:
---
QUOTE(str)
Quotes a string to produce a result that can be used as a properly
escaped data value in an SQL statement. The string is returned
surrounded by single quotes and with each instance of single quote
(`''), backslash (`\'), ASCII NUL, and Control-Z preceded by a
backslash. If the argument is NULL, the return value is the word
``NULL'' without surrounding single quotes. The QUOTE() function
was added in MySQL 4.0.3.
mysql> SELECT QUOTE('Don\'t!');
-> 'Don\'t!'
mysql> SELECT QUOTE(NULL);
-> NULL
---
Now after reading this I thought that select quote(NULL) would
return the string 'NULL' (without quotes) and not the NULL value.
However, this is not true on the version of mysql that I'm using:
You've misunderstood, then. Without the quotes, NULL is the NULL
value, not a string. You have to have quotes to be a string! NULL
is NULL, 'NULL' is a string. MySQL is doing exactly what the manual
says.
It's not. The manual says that if the argument is NULL, the return
value is _the word_ NULL without quotes. In other words, it's a string
but the string doesn't include surrounding quotes.
QUOTE() is supposed to produce values similar to what you get with the
DBI quote() function.
--
Paul DuBois, MySQL Documentation Team
Madison, Wisconsin, USA
MySQL AB, www.mysql.com
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