Delete sql table data then insert multiple variable amount of rows - php

Question

Could anyone help please?
trying to create a page for calendar entries for a band that they can update themselves on their own site.
html entry page:
<form action="addgigtimes.php" method="POST">
<fieldset class='multi'>
<legend><h5>Gig 1</h5></legend>
<label for='weekday' class='accessAid'></label>
<select id='weekday' name='weekday'>
<option value='' selected>Day of week</option>
<option value='Monday'>Monday</option>
<option value='Tuesday'>Tuesday</option>
<option value='Wednesday'>Wednesday</option>
<option value='Thursday'>Thursday</option>
<option value='Friday'>Friday</option>
<option value='Saturday'>Saturday</option>
<option value='Sunday'>Sunday</option></select>
<label for='day' class='accessAid'></label>
<select id='day' name='day'><option value='' selected>--Day--</option>
<option value='01'>01</option>
<option value='02'>02</option>
<option value='03'>03</option>
<option value='04'>04</option>
<option value='05'>05</option>
<option value='06'>06</option>
<option value='07'>07</option>
<option value='08'>08</option>
<option value='09'>09</option>
<option value='10'>10</option>
<option value='11'>11</option>
<option value='12'>12</option>
<option value='13'>13</option>
<option value='14'>14</option>
<option value='15'>15</option>
<option value='16'>16</option>
<option value='17'>17</option>
<option value='18'>18</option>
<option value='19'>19</option>
<option value='20'>20</option>
<option value='21'>21</option>
<option value='22'>22</option>
<option value='23'>23</option>
<option value='24'>24</option>
<option value='25'>25</option>
<option value='26'>26</option>
<option value='27'>27</option>
<option value='28'>28</option>
<option value='29'>29</option>
<option value='30'>30</option>
<option value='31'>31</option></select>
<label for='month' class='accessAid'></label>
<select id='month' name='month'><option value='' selected>--Month--</option>
<option value='01'>01 (Jan)</option>
<option value='02'>02 (Feb)</option>
<option value='03'>03 (Mar)</option>
<option value='04'>04 (Apr)</option>
<option value='05'>05 (May)</option>
<option value='06'>06 (Jun)</option>
<option value='07'>07 (Jul)</option>
<option value='08'>08 (Aug)</option>
<option value='09'>09 (Sep)</option>
<option value='10'>10 (Oct)</option>
<option value='11'>11 (Nov)</option>
<option value='12'>12 (Dec)</option></select>
<label for='year' class='accessAid'></label><select id='year' name='year'>
<option value='' selected>--Year--</option>
<option value='2015'>2015</option>
<option value='2016'>2016</option>
</select>
venue
<input type="text" class="input" name="venue" />
location
<input type="text" class="input" name="location" />
time
<input type="text" class="input" name="time" />
</fieldset>
<button type="reset" style="border: 0; background: transparent">
<img src="images/reset.jpg" alt="reset" style="margin-right:19px "/>
</button>
<button type="submit" value="submit" style="border: 0; background:transparent">
<img src="images/submit.jpg" alt="submit" />
</button>
</form>
I will repeat the fieldset code 30 times so the band can enter a max of 30 gigs at once.
here is the php code:
$sql = "DELETE FROM gigtimes";
$weekday = $_POST['weekday'];
$day = $_POST['day'];
$month = $_POST['month'];
$year = $_POST['year'];
$venue = $_POST['venue'];
$location = $_POST['location'];
$time = $_POST['time'];
$rt=mysql_query("insert into guestbook(weekday,day,month,year,venue,location,time) VALUES ('$weekday','$day','$month','$year','$venue','$location','$time')");
echo mysql_error();
So basically delete whats already on the database then update.
I'm just not sure how to go about the row ids? Could anyone explain.
Thanks,
Bettsy

Answer 1

I have a band like website in production, so I know your pain. One thing I do is insert the band name as well, so that way if the band wants to delete something, it searches for their name and deletes the field such as:
$sql = "DELETE FROM gigtimes WHERE band_name = '$band_name'";
It's not perfect, because in theory there could be multiple bands with the same name, so to prevent that, make band names unique. This works perfectly for me. Let me know if you need more information.