Difference between revisions of "PHP-and-MySQL/C3/MySQL-Part-8/English-timed"
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|It is very easy, as long as you have a standard knowledge of | |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 | |02:15 | ||
| Line 136: | Line 136: | ||
|- | |- | ||
|04:29 | |04:29 | ||
| − | |We are posting this form to this page and let us change some values over here. | + | |We are posting this '''form''' to this page and let us change some values over here. |
|- | |- | ||
|04:34 | |04:34 | ||
| Line 142: | Line 142: | ||
|- | |- | ||
|04:37 | |04:37 | ||
| − | |So, we have changed our | + | |So, we have changed our '''select name''' to "todelete". |
|- | |- | ||
|04:41 | |04:41 | ||
| − | |Now, if you have a look back on this form here, I will show you the code again. | + | |Now, if you have a look back on this '''form''' here, I will show you the '''code''' again. |
|- | |- | ||
|04:47 | |04:47 | ||
| − | |Here we can see that we have our name values and our id value here for each case of each record. | + | |Here we can see that we have our '''name''' values and our '''id''' value here for each case of each '''record'''. |
|- | |- | ||
|04:54 | |04:54 | ||
| − | |If we refresh, the name of our form is "todelete" and we are taking that into account for each value. | + | |If we '''refresh''', the name of our '''form''' is "todelete" and we are taking that into account for each value. |
|- | |- | ||
|05:01 | |05:01 | ||
| − | |If Emily's record has been selected we will delete the record where the id is equal to 3. | + | |If Emily's record has been selected we will delete the record where the '''id''' is equal to 3. |
|- | |- | ||
|05:08 | |05:08 | ||
| − | |Let us go back to our code and here we have our POST variable. | + | |Let us go back to our code and here we have our '''POST''' variable. |
|- | |- | ||
|05:14 | |05:14 | ||
| − | |Now I am going to echo out to give you an example of how it is processed. | + | |Now I am going to '''echo''' out to give you an example of how it is processed. |
|- | |- | ||
|05:20 | |05:20 | ||
| − | |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. | + | |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 | |05:30 | ||
| − | |Here, again we will create a new variable and I will call it "mysql underscore query". | + | |Here, again we will create a new variable and I will call it "mysql underscore query()". |
|- | |- | ||
|05:41 | |05:41 | ||
| − | |Inside here we will use a whole new set of commands. | + | |Inside here. we will use a whole new set of commands. |
|- | |- | ||
|05:45 | |05:45 | ||
| Line 175: | Line 175: | ||
|- | |- | ||
|05:52 | |05:52 | ||
| − | |Let us type "people" and "WHERE id equals "todelete". | + | |Let us type "people" and "WHERE id equals "$todelete". |
|- | |- | ||
|05:57 | |05:57 | ||
| − | |The "todelete" variable which is the id of the person that we selected from this list. | + | |The "$todelete" variable which is the "id" of the person that we selected from this list. |
|- | |- | ||
|06:03 | |06:03 | ||
| − | |Now let us test this. Let us say Emily Headen. | + | |Now, let us test this. Let us say "Emily Headen". |
|- | |- | ||
|06:08 | |06:08 | ||
| Line 187: | Line 187: | ||
|- | |- | ||
|06:13 | |06:13 | ||
| − | |Let us refresh to see if the record still exists. | + | |Let us '''refresh''' to see if the record still exists. |
|- | |- | ||
|06:17 | |06:17 | ||
| − | |When I click on "Emily Headen" and click on | + | |When I click on "Emily Headen" and click on '''Delete''', nothing has happened. |
|- | |- | ||
|06:22 | |06:22 | ||
| − | |We have not echoed out but when we click on | + | |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 | |06:30 | ||
|So in this set of tutorials, I have shown you a basic serve command like | |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 | |06:43 | ||
Latest revision as of 18:07, 20 February 2017
| 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. |
| 00:09 | We did go through that. |
| 00:11 | So, now I will test my code. |
| 00:13 | If we look at our database, we have a few records here. |
| 00:17 | 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. |
| 00:29 | Here I will use Kyle's record as an example and change it to a particular value. |
| 00:34 | 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. |
| 00:46 | 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. |
| 00:58 | I think, I made a mistake. My mistake was that it was name before and now I will change this to value. |
| 01:06 | 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 "$id". |
| 01:15 | When we submit our form, it will come through and the value will be contained within here in "id". |
| 01:25 | So, I found and fixed the problem and now I will go back and refresh. |
| 01:30 | Here, I will once again change "Kyle" to "Karen". By clicking on Change you can see that nothing has happened. |
| 01:37 | Even when I enter my database, we can see that we have got Alex, Kyle, Emily and Dale. |
| 01:42 | Since we had changed "Kyle" to "Karen", our "id" has shown visible changes. |
| 01:47 | But when we click on Browse and scroll down, we can see that "Kyle" has now been replaced by "Karen". |
| 01:54 | Hence, you can also update values using forms. |
| 01:57 | It is very easy, as long as you have a standard knowledge of
php software how to manipulate things how to check things how to use if statements passing variables particularly the posting variables etc. |
| 02:15 | You will be able to learn all this as long as you learn the basic set of these tutorials. |
| 02:20 | As of now, in this tutorial, you have learnt inserting and updating and so on so forth. |
| 02:28 | The last thing I will show you is how to delete. |
| 02:34 | To show you how to delete, I will close this page and and remove this box and edit this. |
| 02:46 | I will replace "Change" with "Delete". |
| 02:49 | Here I will be deleting records where we have a particular name shown. |
| 02:55 | To do this, I will add "$lastname" over here. |
| 03:01 | Let us now not resend that and let us go back to "mysql.php". |
| 03:08 | 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. |
| 03:24 | But it has not been deleted at the moment. |
| 03:27 | Let us make sure all our records are intact first. |
| 03:31 | As you can see here, we have all our records intact and I will choose to delete a particular record. |
| 03:37 | Let us say delete "Emily Headen"; so I will choose the record of Emily Headen to be deleted. |
| 03:45 | Now we need to submit this to a new page called "mysql underscore delete.php". |
| 03:52 | For this, we are going to create a new page, save as "mysql underscore delete.php". |
| 03:59 | We will do exactly the same as we had done before. |
| 04:03 | 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. |
| 04:47 | Here we can see that we have our name values and our id value here for each case of each record. |
| 04:54 | 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. |
| 05:14 | Now I am going to echo out to give you an example of how it is processed. |
| 05:20 | 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. |
| 05:52 | Let us type "people" and "WHERE id equals "$todelete". |
| 05:57 | The "$todelete" variable which is the "id" of the person that we selected from this list. |
| 06:03 | 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. |
| 06:17 | When I click on "Emily Headen" and click on Delete, nothing has happened. |
| 06:22 | 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. |
| 06:50 | 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). |
