Help with sql query line

Posted on 2004-04-17
Medium Priority
Last Modified: 2008-03-06
i am making a website where one of the tables will sometimes get new columns in it. The problem is that i have these lines:

$sql2 = "INSERT INTO la_members values ('','$_POST[username]','$_POST[pass]','$_POST[msn]','$_POST[email]', '0')";

which ofcourse gets the info from a form in another page. Well since i will get new columns i dont know how to make it so i can add to the end of $sql2 like this:

$sql2 = "INSERT INTO la_members values ('','$_POST[username]','$_POST[pass]','$_POST[msn]','$_POST[email]', '0','','','','','','','','','','')";

As many as i want to. Oh yea i have another table where it holds the number of columns that i need. But i somehow i need to be able to add to the end of $sql.

When i mean add i mean like it checks how many i need to add from the other table and like have a loop or something and add the number of '' i need at the end of $sql2.

Help Appreciated thanks
Question by:farhadabas
  • 4
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LVL 12

Accepted Solution

venkateshwarr earned 400 total points
ID: 10850912
If you know the field names in the table.... you can just say

$sql2 = "INSERT INTO la_members(username,pass,msn,email,other) values ('$_POST[username]','$_POST[pass]','$_POST[msn]','$_POST[email]', '0')";

username,pass,msn,email,other are the actual field names in the database to which you have to assign the values...

you can find the number of fields in the table using mysql_num_fields() function:

Here is a snippet:
$link = mysql_connect('localhost', 'mysql_user', 'mysql_password');
$fields = mysql_list_fields("database1", "table1", $link);
$columns = mysql_num_fields($fields);

for ($i = 0; $i < $columns; $i++) {
   echo mysql_field_name($fields, $i) . "\n";

So before inserting the values in the database,
find the number of columns and simply attach '' items in the INSERT query.

Author Comment

ID: 10850960
umm i am not sure if you understood the problem. Ok i am making a game website. One table has the number of games. But as an admin i will be able to add more games so the number of games in that table will increase. Well the when a new member signs up i need to use insert to add him to the members table. But in this members table at the end it has 1 column for each game. Well i want code to automaticly count the number of rows in the table that holds the names of the games. Lets say we assign it to $gamenumber well then i want so when i add members it looks at the value of $gamenumber and adds that many '' to the end of:

$sql2 = "INSERT INTO la_members(username,pass,msn,email,other) values ('$_POST[username]','$_POST[pass]','$_POST[msn]','$_POST[email]', '0')";

so if there is one:

$sql2 = "INSERT INTO la_members(username,pass,msn,email,other) values ('$_POST[username]','$_POST[pass]','$_POST[msn]','$_POST[email]', '0','')";


$sql2 = "INSERT INTO la_members(username,pass,msn,email,other) values ('$_POST[username]','$_POST[pass]','$_POST[msn]','$_POST[email]', '0','','')";

and so on

so i want it somehow to add to the end of $sql2 insert query so it does not give me and error that in the table there are more columns than u specified in $sql2

So what i am asking is somehow when i insert a member into the tables the number of columns specified in the $sql2 query match the number in the actuall table. I want it somehow add to the end of string or something.

Expert Comment

ID: 10852190
As venkateshwarr said, simply get the  number of columns then do a loop and here is the code:

//First a query with no games at all
$sql2 = "INSERT INTO la_members(username,pass,msn,email,other) values ('$_POST[username]','$_POST[pass]','$_POST[msn]','$_POST[email]', '0'";

//somehow you have to get the number of games into the variable $columns
//maybe look at venkateshwarr's answer again

// add ,'' for each game
for($i = 0; $i < $columns; $i++)
$sql2 .= ",''";

// add the ending parenthesis
$sql2 .=");";

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Author Comment

ID: 10853180
roger and one question what does .= mean? like when u said $sql2.=? does it add to the end of text or something?

Expert Comment

ID: 10853383
.= means take the existing string and add the new part to the end.

You could also write the following to have the exact same effect:

$sql2 = $sql2 + ",''";

The only difference is that .= takes less space and looks cleaner =)


Expert Comment

ID: 10853395
Oh, sorry not + but .

$sql2 = $sql2 . ",''";

Author Comment

ID: 10853474
thanks very much click i wish i really could give u both points but now i realized how ven answered my question and i didnt realize he did. Thanks clickmaster you always help me but ven. i realize both of you deserve it but ven got it first.

Expert Comment

ID: 10853617
No problem I dont want to steal his points ;)

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