Select::__construct() - Code Metrics - hfw/db - Measure and Improve Code Quality continuously with Scrutinizer

Select::__construct() A
last analyzed 2021-07-26 13:53 UTC

↳ Parent: Select

Complexity

Conditions	3
Paths	3

Size

Total Lines	20
Code Lines	16

Duplication

Lines	0
Ratio	0 %

Importance

Changes	1
Bugs	0	Features	0

Metric	Value
eloc	16
c	1
b	0
f	0
dl	0
loc	20
rs	9.7333
cc	3
nc	3
nop	3

<?php

namespace Helix\DB;

use Closure;
use Countable;
use Generator;
use Helix\DB;
use Helix\DB\Fluent\ExpressionInterface;
use Helix\DB\Fluent\Predicate;
use IteratorAggregate;

/**
 * Represents a `SELECT` query.
 *
 * @method static static factory(DB $db, string|AbstractTable $table, string|array $expressions = ['*'])
 */
class Select extends AbstractTable implements Countable, IteratorAggregate, ExpressionInterface
{

    use FactoryTrait;

    /**
     * Compiled column list.
     *
     * @internal
     * @var string
     */
    protected $_columns = '';

    /**
     * Compiled column list.
     *
     * @internal
     * @var string
     */
    protected $_group = '';

    /**
     * Compiled predicates.
     *
     * @internal
     * @var string
     */
    protected $_having = '';

    /**
     * Compiled unions and intersections.
     *
     * @internal
     * @var string
     */
    protected $_import = '';

    /**
     * Compiled joins.
     *
     * @internal
     * @var string
     */
    protected $_join = '';

    /**
     * Compiled limit and offset.
     *
     * @internal
     * @var string
     */
    protected $_limit = '';

    /**
     * Compiled column list.
     *
     * @internal
     * @var string
     */
    protected $_order = '';

    /**
     * Compiled source table.
     *
     * @internal
     * @var string
     */
    protected $_table;

    /**
     * Compiled predicates.
     *
     * @internal
     * @var string
     */
    protected $_where = '';

    /**
     * Human-readable alias.
     *
     * @var string
     */
    protected $alias;

    /**
     * A callback to yield each result.
     * Defaults to yielding directly from the statement.
     *
     * @var Closure `(Statement $statement):Generator`
     */
    protected $fetcher;

    /**
     * Columns that can be accessed by an outer query.
     *
     * @var Column[]
     */
    protected $refs = [];

    /**
     * The original table given to the constructor.
     *
     * @var AbstractTable
     */
    protected $table;

    /**
     * @param DB $db
     * @param string|AbstractTable $table
     * @param string|string[] $expressions
     */
    public function __construct(DB $db, $table, $expressions = ['*'])
    {
        static $autoAlias = 0;
        $autoAlias++;
        parent::__construct($db);
        if ($table instanceof Select) {
            $this->_table = $table->toSubquery();
            $this->alias = "_anon{$autoAlias}_{$table->alias}";
        } else {
            if (is_string($table)) {
                $table = $db[$table];
                assert(isset($table));
            }
            $this->_table = (string)$table;
            $this->alias = "_anon{$autoAlias}_{$table}";
        }
        $this->table = $table;
        $this->setColumns($expressions);
        $this->fetcher = function (Statement $statement) {
            yield from $statement;
        };
    }

    /**
     * @param array $args
     * @return Statement
     */
    public function __invoke(array $args = [])
    {
        return $this->execute($args);
    }

    /**
     * Returns the alias.
     *
     * @return string
     */
    final public function __toString()
    {
        return $this->alias;
    }

    /**
     * Clones the instance and selects `COUNT(*)`, using the given execution arguments.
     *
     * @param array $args Execution arguments.
     * @return int
     */
    public function count(array $args = []): int
    {
        $clone = clone $this;
        $clone->_columns = 'COUNT(*)';
        $clone->_order = '';
        return (int)$clone->execute($args)->fetchColumn();
    }

    /**
     * Executes the select, preparing a statement first if arguments are used.
     *
     * @param array $args
     * @return Statement
     */
    public function execute(array $args = [])
    {
        if (empty($args)) {
            return $this->db->query($this->toSql());
        }
        return $this->prepare()->__invoke($args);
    }

    /**
     * Executes and fetches all results.
     *
     * @see fetcher
     *
     * @param array $args Execution arguments.
     * @return array
     */
    public function getAll(array $args = []): array
    {
        return iterator_to_array($this->fetcher->__invoke($this->execute($args)));
    }

    /**
     * @return Column[]
     */
    public function getColumns()
    {
        return $this->refs;
    }

    /**
     * Executes and yields from the fetcher.
     * This is preferable over `fetchAll()` for iterating large result sets.
     *
     * @see fetcher
     *
     * @param array $args Execution arguments.
     * @return Generator
     */
    public function getEach(array $args = [])
    {
        yield from $this->fetcher->__invoke($this->execute($args));
    }

    /**
     * Executes and returns from the fetcher.
     *
     * @see fetcher
     *
     * @param array $args
     * @return mixed
     */
    public function getFirst(array $args = [])
    {
        return $this->getEach($args)->current();
    }

    /**
     * Executes without arguments and yields from the fetcher.
     *
     * @see fetcher
     *
     * @return Generator
     */
    public function getIterator()
    {
        yield from $this->getEach();
    }

    /**
     * Executes and returns the first column of the first row.
     * Use this for reductive queries that only have a single result.
     *
     * @return null|mixed
     */
    public function getResult(array $args = [])
    {
        return $this->execute($args)->fetchColumn();
    }

    /**
     * Adds a column to the `GROUP BY` clause.
     *
     * @param string $column
     * @return $this
     */
    public function group(string $column)
    {
        if (!strlen($this->_group)) {
            $this->_group = " GROUP BY {$column}";
        } else {
            $this->_group .= ", {$column}";
        }
        return $this;
    }

    /**
     * Adds conditions to the `HAVING` clause.
     *
     * @param string ...$conditions
     * @return $this
     */
    public function having(string ...$conditions)
    {
        assert(count($conditions) > 0);
        $conditions = implode(' AND ', $conditions);
        if (!strlen($this->_having)) {
            $this->_having = " HAVING {$conditions}";
        } else {
            $this->_having .= " AND {$conditions}";
        }
        return $this;
    }

    /**
     * `INTERSECT SELECT ...`
     *
     * > Note: MySQL does not support `INTERSECT`. An `INNER JOIN` on every column is used instead.
     *
     * @param Select $select
     * @return $this
     */
    public function intersect(Select $select)
    {
        if ($this->db->isMySQL()) {
            // to be standards compliant, this hack must fail if they don't have the same cols.
            assert(count($this->refs) === count($select->refs) and !array_diff_key($this->refs, $select->refs));
            $this->join($select, ...array_map(function (string $alias, Column $ref) {
                return $ref->is($this->refs[$alias]);
            }, array_keys($select->refs), $select->refs));
            return $this;
        }
        $select = clone $select;
        $select->_order = '';
        $select->_limit = '';
        $this->_import .= " INTERSECT {$select->toSql()}";
        return $this;
    }

    /**
     * `NOT EXISTS (SELECT ...)`
     *
     * @return Predicate
     */
    public function isEmpty()
    {
        return Predicate::factory($this->db, "NOT EXISTS ({$this->toSql()})");
    }

    /**
     * `EXISTS (SELECT ...)`
     *
     * @return Predicate
     */
    public function isNotEmpty()
    {
        return Predicate::factory($this->db, "EXISTS ({$this->toSql()})");
    }

    /**
     * Adds `INNER JOIN $table ON $conditions`
     *
     * @param string|Select $table
     * @param string ...$conditions
     * @return $this
     */
    public function join($table, string ...$conditions)
    {
        assert(count($conditions) > 0);
        if ($table instanceof Select) {
            $table = $table->toSubquery();
        }
        $conditions = implode(' AND ', $conditions);
        $this->_join .= " INNER JOIN {$table} ON {$conditions}";
        return $this;
    }

    /**
     * Adds `LEFT JOIN $table ON $conditions`
     *
     * @param string|Select $table
     * @param string ...$conditions
     * @return $this
     */
    public function joinLeft($table, string ...$conditions)
    {
        assert(count($conditions) > 0);
        if ($table instanceof Select) {
            $table = $table->toSubquery();
        }
        $conditions = implode(' AND ', $conditions);
        $this->_join .= " LEFT JOIN {$table} ON {$conditions}";
        return $this;
    }

    /**
     * Sets the `LIMIT` clause.
     *
     * @param int $limit
     * @param int $offset
     * @return $this
     */
    public function limit(int $limit, int $offset = 0)
    {
        if ($limit == 0) {
            $this->_limit = '';
        } else {
            $this->_limit = " LIMIT {$limit}";
            if ($offset > 1) {
                $this->_limit .= " OFFSET {$offset}";
            }
        }
        return $this;
    }

    /**
     * Returns a reference {@link Column} for an outer query, qualified by the instance's alias.
     *
     * @param int|string $ref Ordinal or reference name.
     * @return null|Column
     */
    public function offsetGet($ref)
    {
        if (is_int($ref)) {
            return current(array_slice($this->refs, $ref, 1)) ?: null;
        }
        return $this->refs[$ref] ?? null;
    }

    /**
     * Sets the `ORDER BY` clause.
     *
     * @param string $order
     * @return $this
     */
    public function order(string $order)
    {
        if (strlen($order)) {
            $order = " ORDER BY {$order}";
        }
        $this->_order = $order;
        return $this;
    }

    /**
     * @return Statement
     */
    public function prepare()
    {
        return $this->db->prepare($this->toSql());
    }

    /**
     * @param string $alias
     * @return $this
     */
    public function setAlias(string $alias)
    {
        $this->alias = $alias;
        foreach ($this->refs as $k => $column) {
            $this->refs[$k] = $column->setQualifier($alias);
        }
        return $this;
    }

    /**
     * Compiles the column list and exposed reference columns.
     *
     * Columns may be expressions, like `COUNT(*)`
     * Unless an alias is given for such expressions, they can't be referenced externally.
     *
     * @param string|string[] $expressions Keyed by alias if applicable.
     * @return $this
     */
    public function setColumns($expressions = ['*'])
    {
        if (is_string($expressions)) {
            $expressions = array_map('trim', explode(',', $expressions));
        }
        if ($expressions === ['*']) {
            $expressions = array_keys($this->table->getColumns());
        }
        $this->refs = [];
        $_columns = [];
        foreach ($expressions as $alias => $expr) {
            preg_match('/^([a-z_][a-z0-9_]+\.)?(?<name>[a-z_][a-z0-9_]+)$/i', $expr, $match);
            $name = $match['name'] ?? null;
            if (is_int($alias)) {
                $alias = $name;
            } elseif ($alias !== $name) {
                $expr .= " AS {$alias}";
            }
            if (isset($alias)) {
                $this->refs[$alias] = Column::factory($this->db, $alias, $this->alias);
            }
            $_columns[] = "{$expr}";
        }
        $this->_columns = implode(', ', $_columns);
        return $this;
    }

    /**
     * @param Closure $fetcher
     * @return $this
     */
    public function setFetcher(Closure $fetcher)
    {
        $this->fetcher = $fetcher;
        return $this;
    }

    /**
     * `SELECT ...`
     *
     * @return string
     */
    public function toSql(): string
    {
        $sql = "SELECT {$this->_columns} FROM {$this->_table}";
        $sql .= $this->_join;
        $sql .= $this->_where;
        $sql .= $this->_group;
        $sql .= $this->_having;
        $sql .= $this->_import;
        $sql .= $this->_order;
        $sql .= $this->_limit;
        return $sql;
    }

    /**
     * `(SELECT ...) AS ALIAS`
     *
     * @return string
     */
    public function toSubquery(): string
    {
        return "({$this->toSql()}) AS {$this->alias}";
    }

    /**
     * `UNION SELECT ...`
     *
     * @param Select $select
     * @return $this
     */
    public function union(Select $select)
    {
        $select = clone $select;
        $select->_order = '';
        $select->_limit = '';
        $this->_import .= " UNION {$select->toSql()}";
        return $this;
    }

    /**
     * `UNION ALL SELECT ...`
     *
     * @param Select $select
     * @return $this
     */
    public function unionAll(Select $select)
    {
        $select = clone $select;
        $select->_order = '';
        $select->_limit = '';
        $this->_import .= " UNION ALL {$select->toSql()}";
        return $this;
    }

    /**
     * Adds conditions to the `WHERE` clause.
     *
     * @param string ...$conditions
     * @return $this
     */
    public function where(string ...$conditions)
    {
        assert(count($conditions) > 0);
        $conditions = implode(' AND ', $conditions);
        if (!strlen($this->_where)) {
            $this->_where = " WHERE {$conditions}";
        } else {
            $this->_where .= " AND {$conditions}";
        }
        return $this;
    }
}


1			<?php
2
3			namespace Helix\DB;
4
5			use Closure;
6			use Countable;
7			use Generator;
8			use Helix\DB;
9			use Helix\DB\Fluent\ExpressionInterface;
10			use Helix\DB\Fluent\Predicate;
11			use IteratorAggregate;
12
13			/**
14			* Represents a `SELECT` query.
15			*
16			* @method static static factory(DB $db, string\|AbstractTable $table, string\|array $expressions = ['*'])
17			*/
18			class Select extends AbstractTable implements Countable, IteratorAggregate, ExpressionInterface
19			{
20
21			use FactoryTrait;
22
23			/**
24			* Compiled column list.
25			*
26			* @internal
27			* @var string
28			*/
29			protected $_columns = '';
30
31			/**
32			* Compiled column list.
33			*
34			* @internal
35			* @var string
36			*/
37			protected $_group = '';
38
39			/**
40			* Compiled predicates.
41			*
42			* @internal
43			* @var string
44			*/
45			protected $_having = '';
46
47			/**
48			* Compiled unions and intersections.
49			*
50			* @internal
51			* @var string
52			*/
53			protected $_import = '';
54
55			/**
56			* Compiled joins.
57			*
58			* @internal
59			* @var string
60			*/
61			protected $_join = '';
62
63			/**
64			* Compiled limit and offset.
65			*
66			* @internal
67			* @var string
68			*/
69			protected $_limit = '';
70
71			/**
72			* Compiled column list.
73			*
74			* @internal
75			* @var string
76			*/
77			protected $_order = '';
78
79			/**
80			* Compiled source table.
81			*
82			* @internal
83			* @var string
84			*/
85			protected $_table;
86
87			/**
88			* Compiled predicates.
89			*
90			* @internal
91			* @var string
92			*/
93			protected $_where = '';
94
95			/**
96			* Human-readable alias.
97			*
98			* @var string
99			*/
100			protected $alias;
101
102			/**
103			* A callback to yield each result.
104			* Defaults to yielding directly from the statement.
105			*
106			* @var Closure `(Statement $statement):Generator`
107			*/
108			protected $fetcher;
109
110			/**
111			* Columns that can be accessed by an outer query.
112			*
113			* @var Column[]
114			*/
115			protected $refs = [];
116
117			/**
118			* The original table given to the constructor.
119			*
120			* @var AbstractTable
121			*/
122			protected $table;
123
124			/**
125			* @param DB $db
126			* @param string\|AbstractTable $table
127			* @param string\|string[] $expressions
128			*/
129			public function __construct(DB $db, $table, $expressions = ['*'])
130			{
131			static $autoAlias = 0;
132			$autoAlias++;
133			parent::__construct($db);
134			if ($table instanceof Select) {
135			$this->_table = $table->toSubquery();
136			$this->alias = "_anon{$autoAlias}_{$table->alias}";
137			} else {
138			if (is_string($table)) {
139			$table = $db[$table];
140			assert(isset($table));
141			}
142			$this->_table = (string)$table;
143			$this->alias = "_anon{$autoAlias}_{$table}";
144			}
145			$this->table = $table;
146			$this->setColumns($expressions);
147			$this->fetcher = function (Statement $statement) {
148			yield from $statement;
149			};
150			}
151
152			/**
153			* @param array $args
154			* @return Statement
155			*/
156			public function __invoke(array $args = [])
157			{
158			return $this->execute($args);
159			}
160
161			/**
162			* Returns the alias.
163			*
164			* @return string
165			*/
166			final public function __toString()
167			{
168			return $this->alias;
169			}
170
171			/**
172			* Clones the instance and selects `COUNT(*)`, using the given execution arguments.
173			*
174			* @param array $args Execution arguments.
175			* @return int
176			*/
177			public function count(array $args = []): int
178			{
179			$clone = clone $this;
180			$clone->_columns = 'COUNT(*)';
181			$clone->_order = '';
182			return (int)$clone->execute($args)->fetchColumn();
183			}
184
185			/**
186			* Executes the select, preparing a statement first if arguments are used.
187			*
188			* @param array $args
189			* @return Statement
190			*/
191			public function execute(array $args = [])
192			{
193			if (empty($args)) {
194			return $this->db->query($this->toSql());
195			}
196			return $this->prepare()->__invoke($args);
197			}
198
199			/**
200			* Executes and fetches all results.
201			*
202			* @see fetcher
203			*
204			* @param array $args Execution arguments.
205			* @return array
206			*/
207			public function getAll(array $args = []): array
208			{
209			return iterator_to_array($this->fetcher->__invoke($this->execute($args)));
210			}
211
212			/**
213			* @return Column[]
214			*/
215			public function getColumns()
216			{
217			return $this->refs;
218			}
219
220			/**
221			* Executes and yields from the fetcher.
222			* This is preferable over `fetchAll()` for iterating large result sets.
223			*
224			* @see fetcher
225			*
226			* @param array $args Execution arguments.
227			* @return Generator
228			*/
229			public function getEach(array $args = [])
230			{
231			yield from $this->fetcher->__invoke($this->execute($args));
232			}
233
234			/**
235			* Executes and returns from the fetcher.
236			*
237			* @see fetcher
238			*
239			* @param array $args
240			* @return mixed
241			*/
242			public function getFirst(array $args = [])
243			{
244			return $this->getEach($args)->current();
245			}
246
247			/**
248			* Executes without arguments and yields from the fetcher.
249			*
250			* @see fetcher
251			*
252			* @return Generator
253			*/
254			public function getIterator()
255			{
256			yield from $this->getEach();
257			}
258
259			/**
260			* Executes and returns the first column of the first row.
261			* Use this for reductive queries that only have a single result.
262			*
263			* @return null\|mixed
264			*/
265			public function getResult(array $args = [])
266			{
267			return $this->execute($args)->fetchColumn();
268			}
269
270			/**
271			* Adds a column to the `GROUP BY` clause.
272			*
273			* @param string $column
274			* @return $this
275			*/
276			public function group(string $column)
277			{
278			if (!strlen($this->_group)) {
279			$this->_group = " GROUP BY {$column}";
280			} else {
281			$this->_group .= ", {$column}";
282			}
283			return $this;
284			}
285
286			/**
287			* Adds conditions to the `HAVING` clause.
288			*
289			* @param string ...$conditions
290			* @return $this
291			*/
292			public function having(string ...$conditions)
293			{
294			assert(count($conditions) > 0);
295			$conditions = implode(' AND ', $conditions);
296			if (!strlen($this->_having)) {
297			$this->_having = " HAVING {$conditions}";
298			} else {
299			$this->_having .= " AND {$conditions}";
300			}
301			return $this;
302			}
303
304			/**
305			* `INTERSECT SELECT ...`
306			*
307			* > Note: MySQL does not support `INTERSECT`. An `INNER JOIN` on every column is used instead.
308			*
309			* @param Select $select
310			* @return $this
311			*/
312			public function intersect(Select $select)
313			{
314			if ($this->db->isMySQL()) {
315			// to be standards compliant, this hack must fail if they don't have the same cols.
316			assert(count($this->refs) === count($select->refs) and !array_diff_key($this->refs, $select->refs));
317			$this->join($select, ...array_map(function (string $alias, Column $ref) {
318			return $ref->is($this->refs[$alias]);
319			}, array_keys($select->refs), $select->refs));
320			return $this;
321			}
322			$select = clone $select;
323			$select->_order = '';
324			$select->_limit = '';
325			$this->_import .= " INTERSECT {$select->toSql()}";
326			return $this;
327			}
328
329			/**
330			* `NOT EXISTS (SELECT ...)`
331			*
332			* @return Predicate
333			*/
334			public function isEmpty()
335			{
336			return Predicate::factory($this->db, "NOT EXISTS ({$this->toSql()})");
337			}
338
339			/**
340			* `EXISTS (SELECT ...)`
341			*
342			* @return Predicate
343			*/
344			public function isNotEmpty()
345			{
346			return Predicate::factory($this->db, "EXISTS ({$this->toSql()})");
347			}
348
349			/**
350			* Adds `INNER JOIN $table ON $conditions`
351			*
352			* @param string\|Select $table
353			* @param string ...$conditions
354			* @return $this
355			*/
356			public function join($table, string ...$conditions)
357			{
358			assert(count($conditions) > 0);
359			if ($table instanceof Select) {
360			$table = $table->toSubquery();
361			}
362			$conditions = implode(' AND ', $conditions);
363			$this->_join .= " INNER JOIN {$table} ON {$conditions}";
364			return $this;
365			}
366
367			/**
368			* Adds `LEFT JOIN $table ON $conditions`
369			*
370			* @param string\|Select $table
371			* @param string ...$conditions
372			* @return $this
373			*/
374			public function joinLeft($table, string ...$conditions)
375			{
376			assert(count($conditions) > 0);
377			if ($table instanceof Select) {
378			$table = $table->toSubquery();
379			}
380			$conditions = implode(' AND ', $conditions);
381			$this->_join .= " LEFT JOIN {$table} ON {$conditions}";
382			return $this;
383			}
384
385			/**
386			* Sets the `LIMIT` clause.
387			*
388			* @param int $limit
389			* @param int $offset
390			* @return $this
391			*/
392			public function limit(int $limit, int $offset = 0)
393			{
394			if ($limit == 0) {
395			$this->_limit = '';
396			} else {
397			$this->_limit = " LIMIT {$limit}";
398			if ($offset > 1) {
399			$this->_limit .= " OFFSET {$offset}";
400			}
401			}
402			return $this;
403			}
404
405			/**
406			* Returns a reference {@link Column} for an outer query, qualified by the instance's alias.
407			*
408			* @param int\|string $ref Ordinal or reference name.
409			* @return null\|Column
410			*/
411			public function offsetGet($ref)
412			{
413			if (is_int($ref)) {
414			return current(array_slice($this->refs, $ref, 1)) ?: null;
415			}
416			return $this->refs[$ref] ?? null;
417			}
418
419			/**
420			* Sets the `ORDER BY` clause.
421			*
422			* @param string $order
423			* @return $this
424			*/
425			public function order(string $order)
426			{
427			if (strlen($order)) {
428			$order = " ORDER BY {$order}";
429			}
430			$this->_order = $order;
431			return $this;
432			}
433
434			/**
435			* @return Statement
436			*/
437			public function prepare()
438			{
439			return $this->db->prepare($this->toSql());
440			}
441
442			/**
443			* @param string $alias
444			* @return $this
445			*/
446			public function setAlias(string $alias)
447			{
448			$this->alias = $alias;
449			foreach ($this->refs as $k => $column) {
450			$this->refs[$k] = $column->setQualifier($alias);
451			}
452			return $this;
453			}
454
455			/**
456			* Compiles the column list and exposed reference columns.
457			*
458			* Columns may be expressions, like `COUNT(*)`
459			* Unless an alias is given for such expressions, they can't be referenced externally.
460			*
461			* @param string\|string[] $expressions Keyed by alias if applicable.
462			* @return $this
463			*/
464			public function setColumns($expressions = ['*'])
465			{
466			if (is_string($expressions)) {
467			$expressions = array_map('trim', explode(',', $expressions));
468			}
469			if ($expressions === ['*']) {
470			$expressions = array_keys($this->table->getColumns());
471			}
472			$this->refs = [];
473			$_columns = [];
474			foreach ($expressions as $alias => $expr) {
475			preg_match('/^([a-z_][a-z0-9_]+\.)?(?<name>[a-z_][a-z0-9_]+)$/i', $expr, $match);
476			$name = $match['name'] ?? null;
477			if (is_int($alias)) {
478			$alias = $name;
479			} elseif ($alias !== $name) {
480			$expr .= " AS {$alias}";
481			}
482			if (isset($alias)) {
483			$this->refs[$alias] = Column::factory($this->db, $alias, $this->alias);
484			}
485			$_columns[] = "{$expr}";
486			}
487			$this->_columns = implode(', ', $_columns);
488			return $this;
489			}
490
491			/**
492			* @param Closure $fetcher
493			* @return $this
494			*/
495			public function setFetcher(Closure $fetcher)
496			{
497			$this->fetcher = $fetcher;
498			return $this;
499			}
500
501			/**
502			* `SELECT ...`
503			*
504			* @return string
505			*/
506			public function toSql(): string
507			{
508			$sql = "SELECT {$this->_columns} FROM {$this->_table}";
509			$sql .= $this->_join;
510			$sql .= $this->_where;
511			$sql .= $this->_group;
512			$sql .= $this->_having;
513			$sql .= $this->_import;
514			$sql .= $this->_order;
515			$sql .= $this->_limit;
516			return $sql;
517			}
518
519			/**
520			* `(SELECT ...) AS ALIAS`
521			*
522			* @return string
523			*/
524			public function toSubquery(): string
525			{
526			return "({$this->toSql()}) AS {$this->alias}";
527			}
528
529			/**
530			* `UNION SELECT ...`
531			*
532			* @param Select $select
533			* @return $this
534			*/
535			public function union(Select $select)
536			{
537			$select = clone $select;
538			$select->_order = '';
539			$select->_limit = '';
540			$this->_import .= " UNION {$select->toSql()}";
541			return $this;
542			}
543
544			/**
545			* `UNION ALL SELECT ...`
546			*
547			* @param Select $select
548			* @return $this
549			*/
550			public function unionAll(Select $select)
551			{
552			$select = clone $select;
553			$select->_order = '';
554			$select->_limit = '';
555			$this->_import .= " UNION ALL {$select->toSql()}";
556			return $this;
557			}
558
559			/**
560			* Adds conditions to the `WHERE` clause.
561			*
562			* @param string ...$conditions
563			* @return $this
564			*/
565			public function where(string ...$conditions)
566			{
567			assert(count($conditions) > 0);
568			$conditions = implode(' AND ', $conditions);
569			if (!strlen($this->_where)) {
570			$this->_where = " WHERE {$conditions}";
571			} else {
572			$this->_where .= " AND {$conditions}";
573			}
574			return $this;
575			}
576			}
577

hfw / db

Select::__construct() A last analyzed 2021-07-26 13:53 UTC

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Select::__construct() A
last analyzed 2021-07-26 13:53 UTC