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filtering-conditions.md

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Filtering Conditions

Learn how to build complex WHERE and HAVING conditions.

Basic WHERE

Simple Equality

$users = $db->find()
    ->from('users')
    ->where('status', 'active')
    ->get();

Comparison Operators

// Greater than
$users = $db->find()->from('users')->where('age', 18, '>')->get();

// Less than or equal
$users = $db->find()->from('users')->where('age', 65, '<=')->get();

// Not equal
$users = $db->find()->from('users')->where('status', 'inactive', '!=')->get();

Multiple Conditions

AND Conditions

$users = $db->find()
    ->from('users')
    ->where('status', 'active')
    ->andWhere('age', 18, '>=')
    ->andWhere('email', '%@example.com', 'LIKE')
    ->get();

OR Conditions

$users = $db->find()
    ->from('users')
    ->where('status', 'active')
    ->orWhere('verified', 1)
    ->get();

Mixed AND/OR

use tommyknocker\pdodb\helpers\Db;

$users = $db->find()
    ->from('users')
    ->where('active', 1)
    ->andWhere(function($query) {
        $query->where('age', 18, '>=')
              ->orWhere('verified', 1);
    })
    ->get();

LIKE and Pattern Matching

Basic LIKE

use tommyknocker\pdodb\helpers\Db;

$users = $db->find()
    ->from('users')
    ->where(Db::like('email', '%@example.com'))
    ->get();

Case-Insensitive LIKE

$users = $db->find()
    ->from('users')
    ->where(Db::ilike('name', 'john%'))
    ->get();

IN and NOT IN

Basic IN

use tommyknocker\pdodb\helpers\Db;

$users = $db->find()
    ->from('users')
    ->where(Db::in('status', ['active', 'pending']))
    ->get();

NOT IN

$users = $db->find()
    ->from('users')
    ->where(Db::notIn('status', ['banned', 'deleted']))
    ->get();

BETWEEN

Value Range

use tommyknocker\pdodb\helpers\Db;

$users = $db->find()
    ->from('users')
    ->where(Db::between('age', 18, 65))
    ->get();

NOT BETWEEN

$users = $db->find()
    ->from('users')
    ->where(Db::notBetween('age', 0, 17))
    ->get();

NULL Handling

IS NULL

use tommyknocker\pdodb\helpers\Db;

$users = $db->find()
    ->from('users')
    ->where(Db::isNull('deleted_at'))
    ->get();

IS NOT NULL

$users = $db->find()
    ->from('users')
    ->where(Db::isNotNull('email'))
    ->get();

Subqueries

WHERE IN with Subquery

$users = $db->find()
    ->from('users')
    ->whereIn('id', function($query) {
        $query->from('orders')
            ->select('user_id')
            ->where('total', 1000, '>');
    })
    ->get();

WHERE NOT IN with Subquery

$users = $db->find()
    ->from('users')
    ->whereNotIn('id', function($query) {
        $query->from('banned_users')
            ->select('user_id');
    })
    ->get();

WHERE EXISTS

$users = $db->find()
    ->from('users')
    ->whereExists(function($query) {
        $query->from('orders')
            ->where('user_id', 'users.id')
            ->where('status', 'completed');
    })
    ->get();

WHERE NOT EXISTS

$users = $db->find()
    ->from('users')
    ->whereNotExists(function($query) {
        $query->from('bans')
            ->where('user_id', 'users.id')
            ->where('active', 1);
    })
    ->get();

HAVING Clause

Filter After Aggregation

$stats = $db->find()
    ->from('orders')
    ->select([
        'user_id',
        'total' => Db::sum('amount')
    ])
    ->groupBy('user_id')
    ->having(Db::sum('amount'), 1000, '>')
    ->get();

Multiple HAVING Conditions

$stats = $db->find()
    ->from('orders')
    ->select(['user_id', 'total' => Db::sum('amount'), 'count' => Db::count()])
    ->groupBy('user_id')
    ->having(Db::count(), 10, '>=')
    ->andHaving('total', 5000, '<')
    ->get();

Complex Examples

User Search

function searchUsers($filters) {
    $query = $db->find()->from('users');
    
    if (isset($filters['keyword'])) {
        $keyword = $filters['keyword'];
        $query->where(function($q) use ($keyword) {
            $q->where(Db::like('name', "%{$keyword}%"))
             ->orWhere(Db::like('email', "%{$keyword}%"));
        });
    }
    
    if (isset($filters['age_min'])) {
        $query->andWhere('age', $filters['age_min'], '>=');
    }
    
    if (isset($filters['age_max'])) {
        $query->andWhere('age', $filters['age_max'], '<=');
    }
    
    if (isset($filters['statuses'])) {
        $query->andWhere(Db::in('status', $filters['statuses']));
    }
    
    return $query->orderBy('created_at', 'DESC')->get();
}

Next Steps