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319 lines (259 loc) · 8.22 KB
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<?php
namespace Symlink\ORM;
use Symlink\ORM\Models\BaseModel;
use Symlink\ORM\Repositories\BaseRepository;
use Symlink\ORM\Collections\TrackedCollection;
class Manager {
/**
* @var \Symlink\ORM\Manager
*/
private static $manager_service = null;
/**
* Holds an array of objects the manager knows exist in the database (either
* from a query or a previous persist() call).
*
* @var TrackedCollection
*/
private $tracked;
/**
* Initializes a non static copy of itself when called. Subsequent calls
* return the same object (fake dependency injection/service).
*
* @return \Symlink\ORM\Manager
*/
public static function getManager() {
// Initialize the service if it's not already set.
if ( self::$manager_service === null ) {
self::$manager_service = new Manager();
}
// Return the instance.
return self::$manager_service;
}
/**
* Manager constructor.
*/
public function __construct() {
$this->tracked = new TrackedCollection;
}
/**
* Get repository instance from classname.
*
* @param $classname
*
* @return \Symlink\ORM\Repositories\BaseRepository
*/
public function getRepository( $classname ) {
// Get the annotations for this class.
$annotations = Mapping::getMapper()->getProcessed( $classname );
// Get the repository for this class (this has already been validated in the Mapper). .
if ( isset( $annotations['ORM_Repository'] ) ) {
return $annotations['ORM_Repository']::getInstance( $classname, $annotations );
} // No repository set, so assume the base.
else {
return BaseRepository::getInstance( $classname, $annotations );
}
}
/**
* Queue this model up to be added to the database with flush().
*
* @param $object
*/
public function persist( BaseModel $object ) {
// Start tracking this object (because it is new, it will be tracked as
// something to be INSERTed)
$this->tracked[ $object ] = _OBJECT_NEW;
}
/**
* Start tracking a model known to exist in the database.
*
* @param \Symlink\ORM\Models\BaseModel $object
*/
public function track( BaseModel $object ) {
// Save it against the key.
$this->tracked[ $object ] = _OBJECT_TRACKED;
}
/**
* This model should be removed from the db when flush() is called.
*
* @param $model
*/
public function remove( BaseModel $object ) {
unset( $this->tracked[ $object ] );
}
/**
* Start tracking a model known to exist in the database.
*
* @param \Symlink\ORM\Models\BaseModel $object
*/
public function clean( BaseModel $object ) {
// Save it against the key.
$this->tracked[ $object ] = _OBJECT_CLEAN;
}
/**
* Add new objects to the database.
* This will perform one query per table no matter how many records need to
* be added.
*
*/
private function _flush_insert(): void {
global $wpdb;
// Get a list of tables and columns that have data to insert.
$insert = $this->tracked->getInsertUpdateTableData( 'getPersistedObjects' );
// Process the INSERTs
if ( count( $insert ) ) {
// Build the combined query for table: $tablename
foreach ( $insert as $classname => $values ) {
$table_name = $wpdb->prefix . $values['table_name'];
// Build the placeholder SQL query.
$sql = "INSERT INTO " . $table_name . "
(" . implode( ", ", $values['columns'] ) . ")
VALUES
";
while ( $values['placeholders_count'] > 0 ) {
$sql .= "(" . implode( ", ", $values['placeholders'] ) . ")";
if ( $values['placeholders_count'] > 1 ) {
$sql .= ",
";
}
$values['placeholders_count'] -= 1;
}
// Insert using Wordpress prepare() which provides SQL injection protection (apparently).
$prepared = $wpdb->prepare( $sql, $values['values'] );
$count = $wpdb->query( $prepared );
// Start tracking all the added objects.
if ( $count ) {
array_walk( $values['objects'], function ( $object ) {
$this->track( $object );
} );
} // Something went wrong.
else {
$this->handle_error( sprintf( __( 'Failed to insert %s record(s) into the database.' ), count( $insert ) ) );
}
}
}
}
/**
* Compares known database state of tracked objects and compares them with
* the current state. Applies any changes to the database.
*
* This will perform one query per table no matter how many records need to
* be updated.
* https://stackoverflow.com/questions/3432/multiple-updates-in-mysql
*/
private function _flush_update(): void {
global $wpdb;
// Get a list of tables and columns that have data to update.
$update = $this->tracked->getInsertUpdateTableData( 'getChangedObjects' );
// Process the UPDATEs
if ( count( $update ) ) {
// Build the combined query for table: $tablename
foreach ( $update as $classname => $values ) {
// Primary key name
$primary_key_name = ( new $classname )->getPrimaryKeyName();
// Table name
$table_name = $wpdb->prefix . $values['table_name'];
$sql = "INSERT INTO " . $table_name . " (" . $primary_key_name . ", " . implode( ", ", $values['columns'] ) . ")
VALUES
";
while ( $values['placeholders_count'] > 0 ) {
$sql .= "(%d, " . implode( ", ", $values['placeholders'] ) . ")";
if ( $values['placeholders_count'] > 1 ) {
$sql .= ",
";
}
$values['placeholders_count'] -= 1;
}
$sql .= "
ON DUPLICATE KEY UPDATE
";
$update_set = [];
foreach ( $values['columns'] as $column ) {
$update_set[] = $column . "=VALUES(" . $column . ")";
}
$sql .= implode( ", ", $update_set ) . ";";
// Insert using Wordpress prepare() which provides SQL injection protection (apparently).
$prepared = $wpdb->prepare( $sql, $values['values'] );
$count = $wpdb->query( $prepared );
// Start tracking all the added objects.
if ( $count !== false ) {
array_walk( $values['objects'], function ( $object ) {
$this->track( $object );
} );
} // Something went wrong.
else {
$this->handle_error( sprintf( __( 'Failed to update %s record(s) into the database.' ), count( $update ) ) );
}
}
}
}
/**
*
*/
private function _flush_delete(): void {
global $wpdb;
// Get a list of tables and columns that have data to update.
$update = $this->tracked->getRemoveTableData();
// Process the INSERTs
if ( count( $update ) ) {
// Build the combined query for table: $tablename
foreach ( $update as $classname => $values ) {
// Primary key name
$primary_key_name = ( new $classname )->getPrimaryKeyName();
// Table name
$table_name = $wpdb->prefix . $values['table_name'];
// Build the SQL.
$sql = "DELETE FROM " . $table_name . " WHERE " . $primary_key_name . " IN (" . implode( ", ", array_fill( 0, count( $values['values'] ), "%d" ) ) . ");";
// Process all deletes for a particular table together as a single query.
$prepared = $wpdb->prepare( $sql, $values['values'] );
$count = $wpdb->query( $prepared );
// Really remove the object from the tracking list.
foreach ( $values['objects'] as $obj_hash => $object ) {
$this->clean( $object );
}
}
}
}
/**
* Apply changes to all models queued up with persist().
* Attempts to combine queries to reduce MySQL load.
*/
public function flush() {
$this->_flush_update();
$this->_flush_insert();
$this->_flush_delete();
}
/**
* Handle the error and ouput it nicely in WordPress style
*
* @param string $fail_message
*/
private function handle_error( string $fail_message = '' ) {
global $wpdb;
// Default fail message
if ( $fail_message === '' ) {
$fail_message = __( 'WordPress database error' );
}
if ( $wpdb->last_error !== '' ) {
$e = new \Exception();
$trace = $e->getTraceAsString();
$error_html = sprintf(
'<div id="error">
<h2 class="error-message"><span class="dashicons dashicons-dismiss"></span>%s</h2>
<p><strong>Last error:</strong></p>
<p>%s</p>
<p><strong>Last query:</strong></p>
<code>%s</code>
<p><strong>Call stack:</strong></p>
<pre>%s</pre>
</div>',
$fail_message,
htmlspecialchars( $wpdb->last_error, ENT_QUOTES ),
htmlspecialchars( $wpdb->last_query, ENT_QUOTES ),
$trace
);
} else {
$error_html = $fail_message;
}
wp_die( $error_html );
}
}
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