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[Documentation]: WordPress.DB.DirectDatabaseQuery #2458

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[Documentation]: WordPress.DB.DirectDatabaseQuery #2458

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119 changes: 119 additions & 0 deletions WordPress/Docs/DB/DirectDatabaseQueryStandard.xml
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Original file line number Diff line number Diff line change
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<?xml version="1.0"?>
<documentation xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:noNamespaceSchemaLocation="https://phpcsstandards.github.io/PHPCSDevTools/phpcsdocs.xsd"
title="Direct Database Query"
>
<standard>
<![CDATA[
You should not make direct database queries, but instead use abstractions such as WP_Query.
]]>
</standard>
<code_comparison>
<code title="Valid: Using WP_Query to retrieve data.">
<![CDATA[
$my_query = new WP_Query(
[
'post_type' => 'foo',
]
);
]]>
</code>
<code title="Invalid: Using a direct query to retrieve data.">
<![CDATA[
$results = $wpdb->get_results(
$wpdb->prepare(
"SELECT * FROM x WHERE y = %s",
'foo',
),
);
]]>
</code>
</code_comparison>

<standard>
<![CDATA[
You should not make direct database queries without caching.
]]>
</standard>
<code_comparison>
<code title="Valid: The results of a direct database query are stored in the object cache.">
<![CDATA[
function foo() {
global $wpdb;

$cached = wp_cache_get( 'foo' );
if ( false !== $cached ) {
return $cached;
}

$results = $wpdb->query(
'SELECT x FROM foo'
);

wp_cache_set( 'foo', $results );
return $results;
}
]]>
</code>
<code title="Invalid: Direct database query is made without leveraging the object cache.">
<![CDATA[
function foo() {
global $wpdb;
return $wpdb->query( 'SELECT x FROM foo' );
}
]]>
</code>
</code_comparison>
<code_comparison>
<code title="Valid: The results of a direct database query are stored in the object cache.">
<![CDATA[
function foo() {
global $wpdb;

$cached = wp_cache_get( 'foo' );
if ( false !== $cached ) {
return $cached;
}

$results = $wpdb->query(
'SELECT x FROM foo'
);

wp_cache_set( 'foo', $results );
return $results;
}
]]>
</code>
<code title="Invalid: Incorrect implementation of caching with a direct database query.">
<![CDATA[
function foo() {
global $wpdb;
$results = $wpdb->query(
'SELECT * from foo'
);

wp_cache_set( 'foo', $results );
return $results;
}
]]>
</code>
</code_comparison>

<standard>
<![CDATA[
You should not make direct database queries to alter the database schema.
]]>
</standard>
<code_comparison>
<code title="Valid: Altering database schema using the dbDelta function.">
<![CDATA[
dbDelta( 'CREATE TABLE foo' );
]]>
</code>
<code title="Invalid: Altering database schema using a direct database query.">
<![CDATA[
$wpdb->query( 'CREATE TABLE foo' );
]]>
</code>
</code_comparison>
</documentation>