PHP-and-MySQL/C3/MySQL-Part-8/English

Time	Narration
00:00	Welcome back! In our previous tutorial, we have established what we are going to change and how we are going to change it.
00:08	We did go through that.
00:10	So, now I will test my code.
00:12	If we look at our database, we have a few records here.
00:18	I am going to delete David's record here because it was from another tutorial.
00:23	After the deletion, we have the records of Alex, Kyle, Emily and Dale
00:28	Here I will use Kyle's record as an example and change it to a particular value.
00:33	We will refresh our page and make sure it is updated.
00:38	I will select "Kyle" and I will change this to "Karen" and I will click on "Change" and here everything has disappeared.
00:45	Now we will come back into our table and click on "Browse" to refresh it.
00:50	we will scroll down and find that nothing has changed.
00:57	I think I made a mistake. My mistake was that it was "name" before and now I will change this to "value".
01:05	This needs to be set to "value" instead of "name"
01:09	"value" holds the value... of anything here that has been selected; so the value is "id".
01:15	When we submit our form, it will come through and the value will be contained within here in "id".
01:24	So, I found and fixed the problem and now I will go back and refresh.
01:30	Here I will once again change "Kyle" to "Karen". By clicking on "Change" you can see that nothing has happened.
01:36	Even when I enter my database, we can see that we have got Alex, Kyle, Emily and Dale.
01:42	Since we had changed "Kyle" to "Karen", our id should have shown the changes.
01:47	But when we click on "Browse" and scroll down, we can see that "Kyle" has now been replaced by "Karen".
01:53	Hence, you can also update values using forms.
01:57	It is very easy, as long as you have a standard knowledge of php software, how to manipulate things, how to check things, how to use if statements, passing variables, particularly the posting variables etc.
02:15	You will be able to learn all this, as long as you learn the basic set of these tutorials.
02:20	As of now, in this tutorial, you have learnt inserting and updating and so on so forth.
02:28	The last thing I will show you is how to delete.
02:33	To show you how to Delete, I will close this page and and remove this box and edit this.
02:45	I will replace "Change" with "Delete".
02:49	Here I will be deleting records where we have a particular name shown.
02:55	To do this, I will add "lastname" over here.
03:00	Let us not resend that and let us go back to "mysql.php".
03:07	Here we now have "Alex Garrett", "Karen Headen" which has been changed or modified from my last example.
03:17	We will click "Karen Headen" and we will click on "Delete". This will delete the record.
03:23	But it has not been deleted at the moment.
03:26	Let us make sure all our records are intact first.
03:30	As you can see here, we have all our records intact and I will choose to delete a particular record.
03:38	Let us say delete "Emily Headen", so I will choose the record of Emily Headen to be deleted.
03:44	Now we need to submit this to a new page called "mysql underscore delete.php".
03:51	For this, we are going to create a new page save as mysql underscore delete.php
03:58	We will do exactly the same as we had done before.
04:02	We are going to "require" our connect so we need to connect to the database.
04:10	Oh Sorry! Let us get that back to "require connect.php" and we will again take the variables in.
04:22	So let us type "todelete" here and that is "equal to" again a "POST" variable here.
04:29	We are posting this form to this page and let us change some values over here.
04:34	Let us say "todelete".
04:37	So we have changed our "select name" to "todelete".
04:41	Now, if you have a look back on this form here, I will show you the code again.
04:46	Here we can see that we have our name values and our id value here for each case of each record.
04:53	If we refresh, the name of our form is "todelete" and we are taking that into account for each value.
05:01	If Emily's record has been selected we will delete the record where the id is equal to 3.
05:08	Let us go back to our code and here we have our POST variable.
05:13	Now I am going to echo out to give you an example of how it is processed.
05:19	We have Emily Headen here. We have 3 there which means that we can use this to delete the id 3 in the database or rather the table.
05:30	Here, again we will create a new variable and I will call it "mysql underscore query".
05:41	Inside here we will use a whole new set of commands.
05:45	We will type in "DELETE FROM" and obviously we will specify our table.
05:51	Let us type "people" and "WHERE id equals "todelete".
05:56	The "todelete" variable which is the id of the person that we selected from this list.
06:02	Now let us test this. Let us say Emily Headen.
06:08	Let us check in our database if Emily Headen's record still exists.
06:13	Let us refresh to see if the record still exists.
06:18	When I click on "Emily Headen" and click on "Delete", nothing has happened.
06:21	We have not echoed out but when we click on "Browse" to refresh, we can see that Emily's record has been deleted from the database.
06:30	So in this set of tutorials, I have shown you a basic serve command like how to insert data how to read data how to modify how to delete data and how to incorporate into html forms.
06:43	If I have forgotten anything, please let me know and I will add it as parts of these tutorials.
06:49	Make sure you subscribe for updates from my channel.
06:53	I hope you enjoyed these tutorials. Thanks for watching.
06:55	This is Evan Varkey dubbing for the Spoken Tutorial Project. (Script contributed by Juanita Jayakar).

Contributors and Content Editors

Chandrika, Pratik kamble