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In this video we’ll explore the PDO **statement** object and how it returns our results. PDO statement objects represents a prepared statement and, after the statement is executed, an associated result set. We access the result set using a method to “fetch” the data.
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We have code in place that connects to
the database and runs a query against it.
0:00
It's now time to work with the results.
0:04
We have those results in
a variable named results.
0:07
However, that variable is not
a simple array like you might think.
0:10
It's actually a new kind of php object.
0:15
Let's take a look at the documentation.
0:18
>> Let's go back to workspaces and
the connection.php file.
0:20
We connect to the database and
if that successful, we run our query.
0:24
If that query is successful,
0:29
then we have the return value of the query
method in a variable named results.
0:30
Let's look in more detail
at this results variable.
0:34
Let's remove this
temporary success message.
0:38
And then we'll jump down
below our try catch block.
0:42
We only need to put the code that
actually interacts with the database
0:45
in that try catch block.
0:48
Let's display information about this
results variable to the screen with
0:50
the var_dump.
0:54
Now let's go back in the browser.
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You can see that
the variable is an object.
1:02
It's a different kind of object
than what we've seen so far.
1:05
It's not an object of the php mailer
class, nor an object of the pdo class.
1:08
It's a pdo statement object.
1:13
Remember, that an object is a collection
of variables, called properties, and
1:15
functions, called methods.
1:19
All bundled together when you display
information about an object to the screen
1:21
like this you'll see
its list of properties.
1:26
This object has one property query string.
1:30
It contains a query string we just ran.
1:33
But how would we find which
methods this object has?
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The pdo statement is
a native class in php.
1:40
So we can find details in the php manual.
1:43
Lets perform a search for pdo statement.
1:46
[NOISE] The first result is
a link to the php manual.
1:48
Looking at the instructions, you can see
that this object represents a prepared
1:54
statement, and after that statement is
executed and associated, result set.
1:59
We'll talk more about prepared
statements a little later.
2:04
Right now, let's look at the result set.
2:07
Here's a list of methods.
2:11
These methods are available for
all objects of this class.
2:13
Some of these have names
that might look obscure.
2:18
Like bindParam.
2:20
But will look more in-depth into
the methods will be using in this project.
2:22
Scrolling down past this list of methods.
2:26
You can see all the method names here
with a little bit of a description.
2:29
Let's see.
2:33
This fetch all method looks promising.
2:33
It returns an array containing
all the result set rows.
2:37
In other words it organizes the data
the database returns into an array.
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Let's go back to our code.
2:47
We'll call the fetch all
method without any arguments.
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Now let's go back in the browser and
take a look at these results.
2:56
The array has 36 elements, one for
each item in the database.
2:59
If we view the page source,
we can see this a little more clearly.
3:03
Each of our 36 elements
then has an internal array
3:08
with each of the attributes of that item.
3:11
We've now written code that uses php
data objects to query the database and
3:14
to load the results in a php array.
3:18
Although this array does resemble
our catalog array in the next video
3:21
we'll be fine tuning these results
to allow us to swap them out for
3:26
our current catalog array.
3:29
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