Chandrika: Created page with '{| border=1 !Time !Narration |- |0:0 |Welcome to the Spoken Tutorial on the fourth part of My SQL and php tutorials. |- |0:10 |In the last tutorial, I used "mysql_query" function…'

2012-11-29T06:46:43Z

Created page with '{| border=1 !Time !Narration |- |0:0 |Welcome to the Spoken Tutorial on the fourth part of My SQL and php tutorials. |- |0:10 |In the last tutorial, I used "mysql_query" function…'

New page

{| border=1
!Time
!Narration
|-
|0:0
|Welcome to the Spoken Tutorial on the fourth part of My SQL and php tutorials.
|-
|0:10
|In the last tutorial, I used "mysql_query" function to insert some values into our table.
|-
|0:20
|I made a mistake here by putting the date as current date, which isn't my date of birth.
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|0:26
|I was able to update here. I was also able to specify where I wanted to update.
|-
|0:31
|Using a unique ID key, I was able to specify exactly where I wanted to update.
|-
|0:35
|So we've already seen the "update" in mysql code.
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|0:40
|This is very useful.
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|0:41
|This query and code is the one that is mostly used while working with tables or if you're working with mysql in general.
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|0:52
|The next thing I'll show you is how to get data from your table and how to display it really well.
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|1:04
|So I will call this "update data" so that we know what that is.
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|1:14
|Here, we will say "extract data".
|-
|1:17
|That's a good word to use.
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|1:18
|Now, again we will say "extract" and we will create a variable.
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|1:24
|This again is "mysql query" and here is some code.
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|1:28
|This is slightly more complicated than using these single line queries.
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|1:37
|We use single line queries here, but we could have some code after this in order to display properly.
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|1:44
|First I will create another record in the table.
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|1:50
|So we don't need this "current date" function anymore.
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|1:52
|I need this "write" to be shown. Lets create some new value.
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|1:59
|I'll say "Kyle Headen" and I'll set a date of birth here. This one is month. So that is the 7th and lets say here, 24th.
|-
|2:16
|So now we got the date of birth.
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|2:18
|Now we've got male and then we've got "Kyle Headen" and we are again inserting this into our database.
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|2:26
|Lets refresh.
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|2:28
|Here I'll create another new value.
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|2:32
|I'll say "Emily Headen" and I'll just leave the date of birth as it is for now.
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|2:44
|This will be "Female" because I'll extract these records at one point.
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|2:48
|Refresh this again.
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|2:50
|So we've created 3 records here.
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|2:53
|I'll comment this "write". Backup my database.
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|2:56
|I'll click on browse in this specific table and you can see that I've got 3 records.
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|3:02
|Each one of these is called a "record of data".
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|3:05
|We can see this id has also automatically incremented.
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|3:07
|We've got the data that we specified and everything that we need.
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|3:12
|Ok, so we are extracting data here and I will uncomment this.
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|3:19
|Our mysql query is going to start with "select".
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|3:23
|This will be either specific records or we can use asterisk (*) to get all the data we need.
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|3:32
|Now I'll use an asterisk (*).
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|3:35
|What you could do is type "select firstname".
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|3:40
|But usually, when you have table, you will need most of the data and it'll take longer to do.
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|3:46
|Depending on the source of the table, this won't take very long.
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|3:52
|So you already have a couple of records or fields.
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|3:55
|But for now I'll say select asterisk (*), which is a star.
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|4:00
|We can say select star and then we say FROM.
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|4:04
|Again we say, the specified table which is "people".
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|4:08
|Here, we can say WHERE and how can you ummm...... filter for the data you want.
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|4:18
|So I can say "SELECT star (*) FROM people WHERE firstname= "Alex'".
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|4:22
|This query will return only one value because we can see that if we open up here, there is only one record with "Alex".
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|4:33
|We can do this by using another really useful function called "mysql numrows" and what I can do is echo this out.
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|4:44
|I'll say "echo mysql_num_rows". This is the reason we have given these variables here to be stored in.
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|4:54
|Here we can just type "extract".
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|4:56
|Our "extract" variable holds our query and our function here tells us how many rows are there in the query that is given out.
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|5:09
|Presuming that we gave firstname as "Alex", it'll show when we refresh.
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|5:14
|However you get 1.
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|5:15
|Lets change this. Lets put something that's common to two people in this database.
|-
|5:21
|That would be the "gender".
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|5:23
|So that'll be "Male" or "Female" . Here we can say "WHERE gender = M" and when we refresh, we get two records.
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|5:35
|So we can tell how many records we are getting out.
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|5:38
|This is really useful for saying how many people in my database are male, for example.
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|5:44
|And we can see how many males or females are registered to our website.
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|5:49
|So you can store registered information inside here.
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|5:55
|What we can also do is order the records.
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|5:59
|So I'll say "ORDER BY id" and we can choose descending that is "DESC" or we can choose ascending, which is "ASC".
|-
|6:08
|But for now I'll take this out because we haven't actually echoed out our data yet.
|-
|6:13
|We haven't displayed out our data to the users that has been selected.
|-
|6:16
|So there is no point in using that at the moment.
|-
|6:19
|Now, here I'll say select star (*) from "people" because I want to select all the data from this table here.
|-
|6:29
|So I can manipulate and show it to the user the way I want.
|-
|6:31
|I'll create something here called "numrows"; "numrows =" that.
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|6:42
|I'll use a "while" loop. This will use a specific function which is "mysql_fetch_assoc".
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|6:58
|It puts this into an associative array.
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|7:02
|If you don't know what an associative array is, check out "Arrays" tutorial.
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|7:06
|Coming back, "WHILE the row= mysql_fetch_aasoc" or associative is what I will say and this is inside the "extract" query.
|-
|7:21
|We are selecting "row" as array name and we are selecting this as an array for all the selected data.
|-
|7:31
|I'll stop here. In the next tutorial I'll show you how to echo out this data.
|-
|7:37
|I'll probably explain this a bit more in detail.
|-
|7:40
|This is Juanita Jayakar dubbing for the Spoken Tutorial Project.

PHP-and-MySQL/C3/MySQL-Part-4 /English - Revision history

Chandrika: Created page with '{| border=1 !Time !Narration |- |0:0 |Welcome to the Spoken Tutorial on the fourth part of My SQL and php tutorials. |- |0:10 |In the last tutorial, I used "mysql_query" function…'