Pratik kamble at 06:28, 10 July 2014

2014-07-10T06:28:56Z

Chandrika: Created page with '{| border=1 !Time !Narration |- |0:00 |Welcome back! In our previous tutorial, we have established what we are going to change and how we are going to change it. |- |0:08 |We did…'

2012-11-29T06:50:11Z

Created page with '{| border=1 !Time !Narration |- |0:00 |Welcome back! In our previous tutorial, we have established what we are going to change and how we are going to change it. |- |0:08 |We did…'

New page

{| border=1
!Time
!Narration
|-
|0:00
|Welcome back! In our previous tutorial, we have established what we are going to change and how we are going to change it.
|-
|0:08
|We did go through that.
|-
|0:10
|So, now I will test my code.
|-
|0:12
|If we look at our database, we have a few records here.
|-
|0:18
|I am going to delete David's record here because it was from another tutorial.
|-
|0:23
|After the deletion, we have the records of Alex, Kyle, Emily and Dale
|-
|0:28
|Here I will use Kyle's record as an example and change it to a particular value.
|-
|0:33
|We will refresh our page and make sure it is updated.
|-
|0:38
|I will select "Kyle" and I will change this to "Karen" and I will click on "Change" and here everything has disappeared.
|-
|0:45
|Now we will come back into our table and click on "Browse" to refresh it.
|-
|0:50
|we will scroll down and find that nothing has changed.
|-
|0:57
|I think I made a mistake. My mistake was that it was "name" before and now I will change this to "value".
|-
|1:05
|This needs to be set to "value" instead of "name"
|-
|1:09
|"value" holds the value... of anything here that has been selected; so the value is "id".
|-
|1:15
|When we submit our form, it will come through and the value will be contained within here in "id".
|-
|1:24
|So, I found and fixed the problem and now I will go back and refresh.
|-
|1:30
|Here I will once again change "Kyle" to "Karen". By clicking on "Change" you can see that nothing has happened.
|-
|1:36
|Even when I enter my database, we can see that we have got Alex, Kyle, Emily and Dale.
|-
|1:42
|Since we had changed "Kyle" to "Karen", our id should have shown the changes.
|-
|1:47
|But when we click on "Browse" and scroll down, we can see that "Kyle" has now been replaced by "Karen".
|-
|1:53
|Hence, you can also update values using forms.
|-
|1:57
|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.
|-
|2:15
|You will be able to learn all this, as long as you learn the basic set of these tutorials.
|-
|2:20
|As of now, in this tutorial, you have learnt inserting and updating and so on so forth.
|-
|2:28
|The last thing I will show you is how to delete.
|-
|2:33
|To show you how to Delete, I will close this page and and remove this box and edit this.
|-
|2:45
|I will replace "Change" with "Delete".
|-
|2:49
|Here I will be deleting records where we have a particular name shown.
|-
|2:55
|To do this, I will add "lastname" over here.
|-
|3:00
|Let us not resend that and let us go back to "mysql.php".
|-
|3:07
|Here we now have "Alex Garrett", "Karen Headen" which has been changed or modified from my last example.
|-
|3:17
|We will click "Karen Headen" and we will click on "Delete". This will delete the record.
|-
|3:23
|But it has not been deleted at the moment.
|-
|3:26
|Let us make sure all our records are intact first.
|-
|3:30
|As you can see here, we have all our records intact and I will choose to delete a particular record.
|-
|3:38
|Let us say delete "Emily Headen", so I will choose the record of Emily Headen to be deleted.
|-
|3:44
|Now we need to submit this to a new page called "mysql underscore delete.php".
|-
|3:51
|For this, we are going to create a new page save as mysql underscore delete.php
|-
|3:58
|We will do exactly the same as we had done before.
|-
|4:02
|We are going to "require" our connect so we need to connect to the database.
|-
|4:10
|Oh Sorry! Let us get that back to "require connect.php" and we will again take the variables in.
|-
|4:22
|So let us type "todelete" here and that is "equal to" again a "POST" variable here.
|-
|4:29
|We are posting this form to this page and let us change some values over here.
|-
|4:34
|Let us say "todelete".
|-
|4:37
|So we have changed our "select name" to "todelete".
|-
|4:41
|Now, if you have a look back on this form here, I will show you the code again.
|-
|4:46
|Here we can see that we have our name values and our id value here for each case of each record.
|-
|4:53
|If we refresh, the name of our form is "todelete" and we are taking that into account for each value.
|-
|5:01
|If Emily's record has been selected we will delete the record where the id is equal to 3.
|-
|5:08
|Let us go back to our code and here we have our POST variable.
|-
|5:13
|Now I am going to echo out to give you an example of how it is processed.
|-
|5:19
|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.
|-
|5:30
|Here, again we will create a new variable and I will call it "mysql underscore query".
|-
|5:41
|Inside here we will use a whole new set of commands.
|-
|5:45
|We will type in "DELETE FROM" and obviously we will specify our table.
|-
|5:51
|Let us type "people" and "WHERE id equals "todelete".
|-
|5:56
|The "todelete" variable which is the id of the person that we selected from this list.
|-
|6:02
|Now let us test this. Let us say Emily Headen.
|-
|6:08
|Let us check in our database if Emily Headen's record still exists.
|-
|6:13
|Let us refresh to see if the record still exists.
|-
|6:18
|When I click on "Emily Headen" and click on "Delete", nothing has happened.
|-
|6:21
|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.
|-
|6:30
|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.
|-
|6:43
|If I have forgotten anything, please let me know and I will add it as parts of these tutorials.
|-
|6:49
|Make sure you subscribe for updates from my channel.
|-
|6:53
|I hope you enjoyed these tutorials. Thanks for watching.
|-
|6:55
|This is Evan Varkey dubbing for the Spoken Tutorial Project. (Script contributed by Juanita Jayakar).

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

Pratik kamble at 06:28, 10 July 2014

Chandrika: Created page with '{| border=1 !Time !Narration |- |0:00 |Welcome back! In our previous tutorial, we have established what we are going to change and how we are going to change it. |- |0:08 |We did…'