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Fix #53394: Insufficient docs regarding PDOStatement::fetch(Object) and constructors

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git-svn-id: https://svn.php.net/repository/phpdoc/en/trunk@339520 c90b9560-bf6c-de11-be94-00142212c4b1
This commit is contained in:
Christoph Michael Becker 2016-06-29 11:03:39 +00:00
parent cd2eae76e7
commit e440c79af1
2 changed files with 63 additions and 1 deletions
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60
reference/pdo/pdostatement/fetch.xml
View file

@ -54,7 +54,9 @@
<listitem><para>
<literal>PDO::FETCH_CLASS</literal>: returns a new instance of the
requested class, mapping the columns of the result set to named
properties in the class. If <parameter>fetch_style</parameter>
properties in the class, and calling the constructor afterwards, unless
<literal>PDO::FETCH_PROPS_LATE</literal> is also given.
If <parameter>fetch_style</parameter>
includes PDO::FETCH_CLASSTYPE (e.g. <literal>PDO::FETCH_CLASS |
PDO::FETCH_CLASSTYPE</literal>) then the name of the class is
determined from a value of the first column.
@ -85,6 +87,12 @@
property names that correspond to the column names returned in your
result set
</para></listitem>
<listitem><para>
<literal>PDO::FETCH_PROPS_LATE</literal>: when used with
<literal>PDO::FETCH_CLASS</literal>, the constructor of the class is
called before the properties are assigned from the respective column
values.
</para></listitem>
</itemizedlist>
</para>
</listitem>
@ -262,6 +270,56 @@ Reading backwards:
</screen>
</example>
<example><title>Construction order</title>
<simpara>
When objects are fetched via <literal>PDO::FETCH_CLASS</literal> the object
properties are assigned first, and then the constructor of the class is
invoked. If <literal>PDO::FETCH_PROPS_LATE</literal> is also given, this
order is reversed, i.e. first the constructor is called, and afterwards the
properties are assigned.
</simpara>
<programlisting role="php">
<![CDATA[
<?php
class Person
{
private $name;
public function __construct()
{
$this->tell();
}
public function tell()
{
if (isset($this->name)) {
echo "I am {$this->name}.\n";
} else {
echo "I don't have a name yet.\n";
}
}
}
$sth = $dbh->query("SELECT * FROM people");
$sth->setFetchMode(PDO::FETCH_CLASS, 'Person');
$person = $sth->fetch();
$person->tell();
$sth->setFetchMode(PDO::FETCH_CLASS|PDO::FETCH_PROPS_LATE, 'Person');
$person = $sth->fetch();
$person->tell();
?>
]]>
</programlisting>
&example.outputs.similar;
<screen>
<![CDATA[
I am Alice.
I am Alice.
I don't have a name yet.
I am Bob.
]]>
</screen>
</example>
</para>
</refsect1>

4
reference/pdo/pdostatement/fetchobject.xml
View file

@ -19,6 +19,10 @@
<constant>PDO::FETCH_CLASS</constant> or
<constant>PDO::FETCH_OBJ</constant> style.
</para>
<para>
When an object is fetched, its properties are assigned from respective
column values, and afterwards its constructor is invoked.
</para>
</refsect1>
<refsect1 role="parameters">