标签：php laravel
<?php
namespace Illuminate\Validation;
use Illuminate\Support\Str;
use Illuminate\Database\ConnectionResolverInterface;
// ok,just namespace
class DatabasePresenceVerifier implements PresenceVerifierInterface
{// like Database Presence Verifier can implements Presence Verifier Interface
/**
* The database connection instance.
*
* @var \Illuminate\Database\ConnectionResolverInterface
*/
protected $db;// database connection instance.
/**
* The database connection to use.
*
* @var string
*/
protected $connection = null;// connection to use as what
/**
* Create a new database presence verifier.
*
* @param \Illuminate\Database\ConnectionResolverInterface $db
* @return void
*/
public function __construct(ConnectionResolverInterface $db)
{
$this->db = $db;//Connection Resolver Interface $db is a instance about this, just a class
}// Create a new database presence verifier
/**
* Count the number of objects in a collection having the given value.
*
* @param string $collection
* @param string $column
* @param string $value
* @param int $excludeId
* @param string $idColumn
* @param array $extra
* @return int
*/
public function getCount($collection, $column, $value, $excludeId = null, $idColumn = null, array $extra = [])
{
$query = $this->table($collection)->where($column, ‘=‘, $value);// get the query sql
// first get Table
// and get the where condition
if (! is_null($excludeId) && $excludeId != ‘NULL‘) {
$query->where($idColumn ?: ‘id‘, ‘<>‘, $excludeId);
}// and set the ID filed field range
foreach ($extra as $key => $extraValue) {
$this->addWhere($query, $key, $extraValue);//
}// and use this way to add other condition.
return $query->count();// get result
}// get Count about collection having the given value
/**
* Count the number of objects in a collection with the given values.
*
* @param string $collection
* @param string $column
* @param array $values
* @param array $extra
* @return int
*/
public function getMultiCount($collection, $column, array $values, array $extra = [])
{
$query = $this->table($collection)->whereIn($column, $values);//first get query
foreach ($extra as $key => $extraValue) {
$this->addWhere($query, $key, $extraValue);
}// second ,get this extra condition
return $query->count();//get result
}//Count the number of objects in a collection with the given values.
/**
* Add a "where" clause to the given query.
*
* @param \Illuminate\Database\Query\Builder $query
* @param string $key
* @param string $extraValue
* @return void
*/
protected function addWhere($query, $key, $extraValue)
{
if ($extraValue === ‘NULL‘) {// if NULL
$query->whereNull($key);
} elseif ($extraValue === ‘NOT_NULL‘) {// if NOT NULL
$query->whereNotNull($key);
} elseif (Str::startsWith($extraValue, ‘!‘)) {// if it start with !
$query->where($key, ‘!=‘, mb_substr($extraValue, 1)); //like != not equal
} else {
$query->where($key, $extraValue);// the normal condition
}
}// add a where clause[looks like list ] to the given query
/**
* Get a query builder for the given table.
*
* @param string $table
* @return \Illuminate\Database\Query\Builder
*/
protected function table($table)
{
return $this->db->connection($this->connection)->table($table);
}//Get a query builder for the given table
// connection table
/**
* Set the connection to be used.
*
* @param string $connection
* @return void
*/
public function setConnection($connection)
{
$this->connection = $connection;
}// set connection
}本文出自 “专注php” 博客，请务必保留此出处http://jingshanls.blog.51cto.com/3357095/1829520
[李景山php]每天laravel-20160926|DatabasePresenceVerifier.php
标签：php laravel
原文地址：http://jingshanls.blog.51cto.com/3357095/1829520
