"bruce" <[EMAIL PROTECTED]> wrote on 09/23/2005 12:24:25 PM:
> hi... > > i've been lloking over various open source apps to get a feel for how the > apps store and manipulate information as it's stored in the mysql db... > > i see some apps that put "'"s around strings that get stored in the db, as > well as some apps that appear to put "'"s around numeric data... > > i'm trying to determine what's the best/correct approach. > > if i have a char data, should i place data in the colume that's been > enclosed by "'"s? > > similarly, if i have numeric/date information, should it be enclosed in > "'"s?? > > i'm currently looking through the mysql docs... > > thoughts/comments/etc... > > thanks > > -bruce > [EMAIL PROTECTED] > Here is the official reference for how to represent all of the MySQL data types as literals: http://dev.mysql.com/doc/mysql/en/literals.html Short and simple: STRINGS and DATES get quoted ('). If a string literal needs to contain any of a list of "special" characters (TAB, CR, LF, NULL, \, ', EOF, ", etc.) you must escape that character with an escape sequence. For instance if you wanted to insert the phrase "Isn't it lovely?" into a text field you would use a SQL statement like this: INSERT tablename (textfieldname, ... other columns...) VALUES ('Isn\'t it lovely?', ... other values ...); NUMBERS do not get quoted. Anyone quoting numbers is killing their application performance by causing at least one extraneous type conversion per assignment/comparison. Numbers include: integers, decimal values, scientific values. Full details are in the reading. Shawn Green Database Administrator Unimin Corporation - Spruce Pine
