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Loops need to:

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The condition is asked before making the decision to enter which means it is possible not to enter the loop.

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Since the condition is atthe bottom of the loop wewill always execute at leastonce.

Note the semi­colonat the end of the condition in thisstructure.

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Usually there is no semi­colon here, but it is ok.

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The set, the check and the change are all doneinside the for. Frequently you will se $ct++ toincrement $ct.

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Example ­ I start out with an html page to gather the data and pass theinformation to the php which processes it.

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I reveive the data and store it as $wklb and $wkoz.I then convert the weight to ounces and print out the number of ounces.If the ounces are less than 17 then I use the $firstlb charge. If I executethe else I use a loop to help me figure out the price.In the loop I add the $every4oz to add to the cost and I then subtractthe four ounces from the weight.

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The single quote does not resolve the variables.

The double quote does.

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Now we are going to startto work with MySQL. Firstwe will create tables andquery those tables usingPUTTY as our tool.

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We will execute Putty. It is free and can be downloaded for your computers.

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I entered the host and now I am going to use Colours to set thebackground to white and theforeground to black text.

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The first login will get you into cisweb.Then we need to specify using MySQLand login for that.

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I am using my username, you need to use yours.Note I have specified using mysql.

Enter the MySQL passwordyou were sent.

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I can create databasesbut students do nothave that power.You have been assigneda couple of databaseswhich you can seeby:show databases;

Once you use one of yourdatabase the database changesand you can now createtables.

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I have now created a table within mydatabase that I called aaatest.I have an int of 4 characters as my id,a name as string/text/character using varchar which means variable length.Note that major could be char(2) sinceit is a fixed character size of 2. The gpais a decimal with 3 characters, 2 of whichare decimals.

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Gets a description of the database.

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Now, following the handout,I am inserting a recordinto the testfirst table.

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Note numeric are not inquotes by varchar or charfields are enclosed inquotes.

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select *from testfirst;

will show all of therecords and all thefields on each of the record.

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If you put a record in and you want to delete it then you can use the delete command andidentify the record to delete. In this case,the record with an idno of 1999 will bedeleted.

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Here I want to change a recordusing the update. I wanted to changethe idno from 33333 to 3333 forthe record where the name is'Robert Brooks'.

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Could have beenchar(12) since fixedwidth.

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List the fields that I want to see.

Now I only want to see those fields forrecords where the major is CI.