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<?php |
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namespace Helix\DB; |
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use Countable; |
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use Helix\DB\SQL\ExpressionInterface; |
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/** |
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* Static helper for building SQL. |
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* |
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* The methods here are driver agnostic, and do not quote values. |
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*/ |
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class SQL { |
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/** |
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* Returns an array of `?` placeholders. |
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* |
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* @param int|array|Countable $count |
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* @return ExpressionInterface[] |
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*/ |
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public static function marks ($count): array { |
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static $mark; |
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$mark ??= new class implements ExpressionInterface { |
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public function __toString () { |
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return '?'; |
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} |
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}; |
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if (is_array($count) or $count instanceof Countable) { |
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$count = count($count); |
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} |
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return array_fill(0, $count, $mark); |
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} |
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/** |
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* Converts an array of columns to `:named` placeholders for prepared queries. |
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* |
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* Qualified columns are slotted as `qualifier__column` (two underscores). |
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* |
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* @param string[] $columns |
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* @return string[] `["column" => ":column"]` |
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*/ |
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public static function slots (array $columns): array { |
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$slots = []; |
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foreach ($columns as $column) { |
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$slots[$column] = ':' . str_replace('.', '__', $column); |
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} |
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return $slots; |
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} |
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/** |
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* @param string[] $columns |
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* @return string[] `["column" => "column=:column"]` |
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*/ |
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public static function slotsEqual (array $columns): array { |
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$slots = static::slots($columns); |
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foreach ($slots as $column => $slot) { |
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$slots[$column] = "{$column} = {$slot}"; |
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} |
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return $slots; |
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} |
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final private function __construct () { |
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} |
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} |
hfw /
db
