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<?php |
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namespace mindplay\sql\model; |
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use mindplay\sql\framework\Driver; |
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use mindplay\sql\framework\MapperProvider; |
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use mindplay\sql\framework\TypeProvider; |
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use mindplay\sql\model\components\Mappers; |
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use mindplay\sql\model\components\ReturnVars; |
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/** |
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* This class represents a SELECT query. |
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* |
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* This class implements `__toString()` magic, enabling the use of this query builder |
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* in the SELECT, WHERE or ORDER BY clause of a parent SELECT (or other type of) query. |
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* |
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* Note that, when constructing nested queries, parameters must be bound against the |
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* parent query - binding parameters or applying Mappers against a nested query has no effect. |
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*/ |
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class SelectQuery extends ProjectionQuery implements MapperProvider |
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{ |
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use Mappers; |
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/** |
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* @var ReturnVars |
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*/ |
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private $return_vars; |
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/** |
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* @var string[] list of GROUP BY expressions |
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*/ |
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private $group_by = []; |
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/** |
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* @param Table $root |
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* @param Driver $driver |
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* @param TypeProvider $types |
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*/ |
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public function __construct(Table $root, Driver $driver, TypeProvider $types) |
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{ |
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parent::__construct($root, $driver, $types); |
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$this->return_vars = new ReturnVars($root, $driver, $types); |
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} |
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/** |
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* Add all the Columns of a full Table to be selected and returned |
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* |
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* @param Table $table Table to select and return |
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* |
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* @return $this |
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*/ |
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public function table(Table $table) |
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{ |
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$this->return_vars->addTable($table); |
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return $this; |
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} |
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/** |
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* Add one or more Columns to select and return |
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* |
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* @param Column|Column[] one or more Columns to select and return |
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* |
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* @return $this |
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*/ |
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public function columns($cols) |
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{ |
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$this->return_vars->addColumns($cols); |
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return $this; |
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} |
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/** |
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* Add an SQL expression to select and return |
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* |
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* @param string $expr return expression |
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* @param string|null $name return variable name (optional, but usually required) |
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* @param Type|string|null $type optional Type (or Type class-name) |
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* |
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* @return $this |
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*/ |
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public function value($expr, $name = null, $type = null) |
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{ |
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$this->return_vars->addValue($expr, $name, $type); |
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return $this; |
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} |
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/** |
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* Add an expression to apply to a GROUP BY clause |
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* |
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* @param Column|string $expr SQL expression (or Column object) to apply to the GROUP BY clause |
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* |
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* @return $this |
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*/ |
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public function groupBy($expr) |
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{ |
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$this->group_by[] = (string) $expr; |
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return $this; |
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} |
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/** |
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* @inheritdoc |
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*/ |
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public function getMappers() |
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{ |
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return array_merge([$this->return_vars->createTypeMapper()], $this->mappers); |
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} |
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/** |
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* @inheritdoc |
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*/ |
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public function getSQL() |
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{ |
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$select = "SELECT " . $this->return_vars->buildReturnVars(); |
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$from = "\nFROM " . $this->buildNodes(); |
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$where = count($this->conditions) |
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? "\nWHERE " . $this->buildConditions() |
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: ''; // no conditions present |
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$group_by = count($this->group_by) |
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? "\nGROUP BY " . implode(", ", $this->group_by) |
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: ""; // no group-by expressions |
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$order = count($this->order) |
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? "\nORDER BY " . $this->buildOrderTerms() |
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: ''; // no order terms |
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$limit = $this->limit !== null |
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? "\nLIMIT {$this->limit}" |
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. ($this->offset !== null ? " OFFSET {$this->offset}" : '') |
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: ''; // no limit or offset |
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return "{$select}{$from}{$where}{$group_by}{$order}{$limit}"; |
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} |
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/** |
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* @ignore string magic (enables creation of nested SELECT queries) |
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*/ |
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public function __toString() |
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{ |
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return "(" . $this->getSQL() . ")"; |
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} |
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} |
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mindplay-dk /
sql
