QueryTrait::addOrderBy() - Code Metrics - Inspection of "Merge branch 'module-di-config'" - rob006/yii2-dev - Measure and Improve Code Quality continuously with Scrutinizer

Completed

Push — master ( 53a2a4...560332 )

by Robert

created 2016-12-02 13:13 UTC

QueryTrait::addOrderBy() A

↳ Parent: QueryTrait

Complexity

Conditions	2
Paths	2

Size

Total Lines	10
Code Lines	7

Duplication

Lines	0
Ratio	0 %

Code Coverage

Tests	7
CRAP Score	2

Importance

Changes

Metric	Value
dl	0
loc	10
rs	9.4285
c	0
b	0
f	0
ccs	7
cts	7
cp	1
cc	2
eloc	7
nc	2
nop	1
crap	2

<?php
/**
 * @link http://www.yiiframework.com/
 * @copyright Copyright (c) 2008 Yii Software LLC
 * @license http://www.yiiframework.com/license/
 */

namespace yii\db;

use yii\base\NotSupportedException;

/**
 * The BaseQuery trait represents the minimum method set of a database Query.
 *
 * It is supposed to be used in a class that implements the [[QueryInterface]].
 *
 * @author Qiang Xue <[email protected]>
 * @author Carsten Brandt <[email protected]>
 * @since 2.0
 */
trait QueryTrait
{
    /**
     * @var string|array query condition. This refers to the WHERE clause in a SQL statement.
     * For example, `['age' => 31, 'team' => 1]`.
     * @see where() for valid syntax on specifying this value.
     */
    public $where;
    /**
     * @var int maximum number of records to be returned. If not set or less than 0, it means no limit.
     */
    public $limit;
    /**
     * @var int zero-based offset from where the records are to be returned. If not set or
     * less than 0, it means starting from the beginning.
     */
    public $offset;
    /**
     * @var array how to sort the query results. This is used to construct the ORDER BY clause in a SQL statement.
     * The array keys are the columns to be sorted by, and the array values are the corresponding sort directions which
     * can be either [SORT_ASC](http://php.net/manual/en/array.constants.php#constant.sort-asc)
     * or [SORT_DESC](http://php.net/manual/en/array.constants.php#constant.sort-desc).
     * The array may also contain [[Expression]] objects. If that is the case, the expressions
     * will be converted into strings without any change.
     */
    public $orderBy;
    /**
     * @var string|callable $column the name of the column by which the query results should be indexed by.
     * This can also be a callable (e.g. anonymous function) that returns the index value based on the given
     * row data. For more details, see [[indexBy()]]. This property is only used by [[QueryInterface::all()|all()]].
     */
    public $indexBy;
    /**
     * @var boolean whether to emulate the actual query execution, returning empty or false results.
     * @see emulateExecution()
     * @since 2.0.11
     */
    public $emulateExecution = false;


    /**
     * Sets the [[indexBy]] property.
     * @param string|callable $column the name of the column by which the query results should be indexed by.
     * This can also be a callable (e.g. anonymous function) that returns the index value based on the given
     * row data. The signature of the callable should be:
     *
     * ```php
     * function ($row)
     * {
     *     // return the index value corresponding to $row
     * }
     * ```
     *
     * @return $this the query object itself
     */
    public function indexBy($column)
    {
        $this->indexBy = $column;
        return $this;
    }

    /**
     * Sets the WHERE part of the query.
     *
     * See [[QueryInterface::where()]] for detailed documentation.
     *
     * @param string|array $condition the conditions that should be put in the WHERE part.
     * @return $this the query object itself
     * @see andWhere()
     * @see orWhere()
     */
    public function where($condition)
    {
        $this->where = $condition;
        return $this;
    }

    /**
     * Adds an additional WHERE condition to the existing one.
     * The new condition and the existing one will be joined using the 'AND' operator.
     * @param string|array $condition the new WHERE condition. Please refer to [[where()]]
     * on how to specify this parameter.
     * @return $this the query object itself
     * @see where()
     * @see orWhere()
     */
    public function andWhere($condition)
    {
        if ($this->where === null) {
            $this->where = $condition;
        } else {
            $this->where = ['and', $this->where, $condition];
        }
        return $this;
    }

    /**
     * Adds an additional WHERE condition to the existing one.
     * The new condition and the existing one will be joined using the 'OR' operator.
     * @param string|array $condition the new WHERE condition. Please refer to [[where()]]
     * on how to specify this parameter.
     * @return $this the query object itself
     * @see where()
     * @see andWhere()
     */
    public function orWhere($condition)
    {
        if ($this->where === null) {
            $this->where = $condition;
        } else {
            $this->where = ['or', $this->where, $condition];
        }
        return $this;
    }

    /**
     * Sets the WHERE part of the query but ignores [[isEmpty()|empty operands]].
     *
     * This method is similar to [[where()]]. The main difference is that this method will
     * remove [[isEmpty()|empty query operands]]. As a result, this method is best suited
     * for building query conditions based on filter values entered by users.
     *
     * The following code shows the difference between this method and [[where()]]:
     *
     * ```php
     * // WHERE `age`=:age
     * $query->filterWhere(['name' => null, 'age' => 20]);
     * // WHERE `age`=:age
     * $query->where(['age' => 20]);
     * // WHERE `name` IS NULL AND `age`=:age
     * $query->where(['name' => null, 'age' => 20]);
     * ```
     *
     * Note that unlike [[where()]], you cannot pass binding parameters to this method.
     *
     * @param array $condition the conditions that should be put in the WHERE part.
     * See [[where()]] on how to specify this parameter.
     * @return $this the query object itself
     * @see where()
     * @see andFilterWhere()
     * @see orFilterWhere()
     */
    public function filterWhere(array $condition)
    {
        $condition = $this->filterCondition($condition);
        if ($condition !== []) {
            $this->where($condition);
        }
        return $this;
    }

    /**
     * Adds an additional WHERE condition to the existing one but ignores [[isEmpty()|empty operands]].
     * The new condition and the existing one will be joined using the 'AND' operator.
     *
     * This method is similar to [[andWhere()]]. The main difference is that this method will
     * remove [[isEmpty()|empty query operands]]. As a result, this method is best suited
     * for building query conditions based on filter values entered by users.
     *
     * @param array $condition the new WHERE condition. Please refer to [[where()]]
     * on how to specify this parameter.
     * @return $this the query object itself
     * @see filterWhere()
     * @see orFilterWhere()
     */
    public function andFilterWhere(array $condition)
    {
        $condition = $this->filterCondition($condition);
        if ($condition !== []) {
            $this->andWhere($condition);
        }
        return $this;
    }

    /**
     * Adds an additional WHERE condition to the existing one but ignores [[isEmpty()|empty operands]].
     * The new condition and the existing one will be joined using the 'OR' operator.
     *
     * This method is similar to [[orWhere()]]. The main difference is that this method will
     * remove [[isEmpty()|empty query operands]]. As a result, this method is best suited
     * for building query conditions based on filter values entered by users.
     *
     * @param array $condition the new WHERE condition. Please refer to [[where()]]
     * on how to specify this parameter.
     * @return $this the query object itself
     * @see filterWhere()
     * @see andFilterWhere()
     */
    public function orFilterWhere(array $condition)
    {
        $condition = $this->filterCondition($condition);
        if ($condition !== []) {
            $this->orWhere($condition);
        }
        return $this;
    }

    /**
     * Removes [[isEmpty()|empty operands]] from the given query condition.
     *
     * @param array $condition the original condition
     * @return array the condition with [[isEmpty()|empty operands]] removed.
     * @throws NotSupportedException if the condition operator is not supported
     */
    protected function filterCondition($condition)
    {
        if (!is_array($condition)) {
            return $condition;
        }

        if (!isset($condition[0])) {
            // hash format: 'column1' => 'value1', 'column2' => 'value2', ...
            foreach ($condition as $name => $value) {
                if ($this->isEmpty($value)) {
                    unset($condition[$name]);
                }
            }
            return $condition;
        }

        // operator format: operator, operand 1, operand 2, ...

        $operator = array_shift($condition);

        switch (strtoupper($operator)) {
            case 'NOT':
            case 'AND':
            case 'OR':
                foreach ($condition as $i => $operand) {
                    $subCondition = $this->filterCondition($operand);
                    if ($this->isEmpty($subCondition)) {
                        unset($condition[$i]);
                    } else {
                        $condition[$i] = $subCondition;
                    }
                }

                if (empty($condition)) {
                    return [];
                }
                break;
            case 'BETWEEN':
            case 'NOT BETWEEN':
                if (array_key_exists(1, $condition) && array_key_exists(2, $condition)) {
                    if ($this->isEmpty($condition[1]) || $this->isEmpty($condition[2])) {
                        return [];
                    }
                }
                break;
            default:
                if (array_key_exists(1, $condition) && $this->isEmpty($condition[1])) {
                    return [];
                }
        }

        array_unshift($condition, $operator);

        return $condition;
    }

    /**
     * Returns a value indicating whether the give value is "empty".
     *
     * The value is considered "empty", if one of the following conditions is satisfied:
     *
     * - it is `null`,
     * - an empty string (`''`),
     * - a string containing only whitespace characters,
     * - or an empty array.
     *
     * @param mixed $value
     * @return bool if the value is empty
     */
    protected function isEmpty($value)
    {
        return $value === '' || $value === [] || $value === null || is_string($value) && trim($value) === '';
    }

    /**
     * Sets the ORDER BY part of the query.
     * @param string|array|Expression $columns the columns (and the directions) to be ordered by.
     * Columns can be specified in either a string (e.g. `"id ASC, name DESC"`) or an array
     * (e.g. `['id' => SORT_ASC, 'name' => SORT_DESC]`).
     *
     * The method will automatically quote the column names unless a column contains some parenthesis
     * (which means the column contains a DB expression).
     *
     * Note that if your order-by is an expression containing commas, you should always use an array
     * to represent the order-by information. Otherwise, the method will not be able to correctly determine
     * the order-by columns.
     *
     * Since version 2.0.7, an [[Expression]] object can be passed to specify the ORDER BY part explicitly in plain SQL.
     * @return $this the query object itself
     * @see addOrderBy()
     */
    public function orderBy($columns)
    {
        $this->orderBy = $this->normalizeOrderBy($columns);
        return $this;
    }

    /**
     * Adds additional ORDER BY columns to the query.
     * @param string|array|Expression $columns the columns (and the directions) to be ordered by.
     * Columns can be specified in either a string (e.g. "id ASC, name DESC") or an array
     * (e.g. `['id' => SORT_ASC, 'name' => SORT_DESC]`).
     *
     * The method will automatically quote the column names unless a column contains some parenthesis
     * (which means the column contains a DB expression).
     *
     * Note that if your order-by is an expression containing commas, you should always use an array
     * to represent the order-by information. Otherwise, the method will not be able to correctly determine
     * the order-by columns.
     *
     * Since version 2.0.7, an [[Expression]] object can be passed to specify the ORDER BY part explicitly in plain SQL.
     * @return $this the query object itself
     * @see orderBy()
     */
    public function addOrderBy($columns)
    {
        $columns = $this->normalizeOrderBy($columns);
        if ($this->orderBy === null) {
            $this->orderBy = $columns;
        } else {
            $this->orderBy = array_merge($this->orderBy, $columns);
        }
        return $this;
    }

    /**
     * Normalizes format of ORDER BY data
     *
     * @param array|string|Expression $columns the columns value to normalize. See [[orderBy]] and [[addOrderBy]].
     * @return array
     */
    protected function normalizeOrderBy($columns)
    {
        if ($columns instanceof Expression) {
            return [$columns];
        } elseif (is_array($columns)) {
            return $columns;
        } else {
            $columns = preg_split('/\s*,\s*/', trim($columns), -1, PREG_SPLIT_NO_EMPTY);
            $result = [];
            foreach ($columns as $column) {
                if (preg_match('/^(.*?)\s+(asc|desc)$/i', $column, $matches)) {
                    $result[$matches[1]] = strcasecmp($matches[2], 'desc') ? SORT_ASC : SORT_DESC;
                } else {
                    $result[$column] = SORT_ASC;
                }
            }
            return $result;
        }
    }

    /**
     * Sets the LIMIT part of the query.
     * @param int $limit the limit. Use null or negative value to disable limit.
     * @return $this the query object itself
     */
    public function limit($limit)
    {
        $this->limit = $limit;
        return $this;
    }

    /**
     * Sets the OFFSET part of the query.
     * @param int $offset the offset. Use null or negative value to disable offset.
     * @return $this the query object itself
     */
    public function offset($offset)
    {
        $this->offset = $offset;
        return $this;
    }

    /**
     * Sets whether to emulate query execution, preventing any interaction with data storage.
     * After this mode is enabled, methods, returning query results like [[one()]], [[all()]], [[exists()]]
     * and so on, will return empty or false values.
     * You should use this method in case your program logic indicates query should not return any results, like
     * in case you set false where condition like `0=1`.
     * @param boolean $value whether to prevent query execution.
     * @return $this the query object itself.
     * @since 2.0.11
     */
    public function emulateExecution($value = true)
    {
        $this->emulateExecution = $value;
        return $this;
    }
}


1		<?php
2		/**
3		* @link http://www.yiiframework.com/
4		* @copyright Copyright (c) 2008 Yii Software LLC
5		* @license http://www.yiiframework.com/license/
6		*/
7
8		namespace yii\db;
9
10		use yii\base\NotSupportedException;
11
12		/**
13		* The BaseQuery trait represents the minimum method set of a database Query.
14		*
15		* It is supposed to be used in a class that implements the [[QueryInterface]].
16		*
17		* @author Qiang Xue <[email protected]>
18		* @author Carsten Brandt <[email protected]>
19		* @since 2.0
20		*/
21		trait QueryTrait
22		{
23		/**
24		* @var string\|array query condition. This refers to the WHERE clause in a SQL statement.
25		* For example, `['age' => 31, 'team' => 1]`.
26		* @see where() for valid syntax on specifying this value.
27		*/
28		public $where;
29		/**
30		* @var int maximum number of records to be returned. If not set or less than 0, it means no limit.
31		*/
32		public $limit;
33		/**
34		* @var int zero-based offset from where the records are to be returned. If not set or
35		* less than 0, it means starting from the beginning.
36		*/
37		public $offset;
38		/**
39		* @var array how to sort the query results. This is used to construct the ORDER BY clause in a SQL statement.
40		* The array keys are the columns to be sorted by, and the array values are the corresponding sort directions which
41		* can be either [SORT_ASC](http://php.net/manual/en/array.constants.php#constant.sort-asc)
42		* or [SORT_DESC](http://php.net/manual/en/array.constants.php#constant.sort-desc).
43		* The array may also contain [[Expression]] objects. If that is the case, the expressions
44		* will be converted into strings without any change.
45		*/
46		public $orderBy;
47		/**
48		* @var string\|callable $column the name of the column by which the query results should be indexed by.
49		* This can also be a callable (e.g. anonymous function) that returns the index value based on the given
50		* row data. For more details, see [[indexBy()]]. This property is only used by [[QueryInterface::all()\|all()]].
51		*/
52		public $indexBy;
53		/**
54		* @var boolean whether to emulate the actual query execution, returning empty or false results.
55		* @see emulateExecution()
56		* @since 2.0.11
57		*/
58		public $emulateExecution = false;
59
60
61		/**
62		* Sets the [[indexBy]] property.
63		* @param string\|callable $column the name of the column by which the query results should be indexed by.
64		* This can also be a callable (e.g. anonymous function) that returns the index value based on the given
65		* row data. The signature of the callable should be:
66		*
67		* ```php
68		* function ($row)
69		* {
70		* // return the index value corresponding to $row
71		* }
72		* ```
73		*
74		* @return $this the query object itself
75		*/
76	36	public function indexBy($column)
77		{
78	36	$this->indexBy = $column;
79	36	return $this;
80		}
81
82		/**
83		* Sets the WHERE part of the query.
84		*
85		* See [[QueryInterface::where()]] for detailed documentation.
86		*
87		* @param string\|array $condition the conditions that should be put in the WHERE part.
88		* @return $this the query object itself
89		* @see andWhere()
90		* @see orWhere()
91		*/
92		public function where($condition)
93		{
94		$this->where = $condition;
95		return $this;
96		}
97
98		/**
99		* Adds an additional WHERE condition to the existing one.
100		* The new condition and the existing one will be joined using the 'AND' operator.
101		* @param string\|array $condition the new WHERE condition. Please refer to [[where()]]
102		* on how to specify this parameter.
103		* @return $this the query object itself
104		* @see where()
105		* @see orWhere()
106		*/
107		public function andWhere($condition)
108		{
109		if ($this->where === null) {
110		$this->where = $condition;
111		} else {
112		$this->where = ['and', $this->where, $condition];
113		}
114		return $this;
115		}
116
117		/**
118		* Adds an additional WHERE condition to the existing one.
119		* The new condition and the existing one will be joined using the 'OR' operator.
120		* @param string\|array $condition the new WHERE condition. Please refer to [[where()]]
121		* on how to specify this parameter.
122		* @return $this the query object itself
123		* @see where()
124		* @see andWhere()
125		*/
126		public function orWhere($condition)
127		{
128		if ($this->where === null) {
129		$this->where = $condition;
130		} else {
131		$this->where = ['or', $this->where, $condition];
132		}
133		return $this;
134		}
135
136		/**
137		* Sets the WHERE part of the query but ignores [[isEmpty()\|empty operands]].
138		*
139		* This method is similar to [[where()]]. The main difference is that this method will
140		* remove [[isEmpty()\|empty query operands]]. As a result, this method is best suited
141		* for building query conditions based on filter values entered by users.
142		*
143		* The following code shows the difference between this method and [[where()]]:
144		*
145		* ```php
146		* // WHERE `age`=:age
147		* $query->filterWhere(['name' => null, 'age' => 20]);
148		* // WHERE `age`=:age
149		* $query->where(['age' => 20]);
150		* // WHERE `name` IS NULL AND `age`=:age
151		* $query->where(['name' => null, 'age' => 20]);
152		* ```
153		*
154		* Note that unlike [[where()]], you cannot pass binding parameters to this method.
155		*
156		* @param array $condition the conditions that should be put in the WHERE part.
157		* See [[where()]] on how to specify this parameter.
158		* @return $this the query object itself
159		* @see where()
160		* @see andFilterWhere()
161		* @see orFilterWhere()
162		*/
163	72	public function filterWhere(array $condition)
164		{
165	72	$condition = $this->filterCondition($condition);
166	72	if ($condition !== []) {
167	21	$this->where($condition);
168	21	}
169	72	return $this;
170		}
171
172		/**
173		* Adds an additional WHERE condition to the existing one but ignores [[isEmpty()\|empty operands]].
174		* The new condition and the existing one will be joined using the 'AND' operator.
175		*
176		* This method is similar to [[andWhere()]]. The main difference is that this method will
177		* remove [[isEmpty()\|empty query operands]]. As a result, this method is best suited
178		* for building query conditions based on filter values entered by users.
179		*
180		* @param array $condition the new WHERE condition. Please refer to [[where()]]
181		* on how to specify this parameter.
182		* @return $this the query object itself
183		* @see filterWhere()
184		* @see orFilterWhere()
185		*/
186	6	public function andFilterWhere(array $condition)
187		{
188	6	$condition = $this->filterCondition($condition);
189	6	if ($condition !== []) {
190	3	$this->andWhere($condition);
191	3	}
192	6	return $this;
193		}
194
195		/**
196		* Adds an additional WHERE condition to the existing one but ignores [[isEmpty()\|empty operands]].
197		* The new condition and the existing one will be joined using the 'OR' operator.
198		*
199		* This method is similar to [[orWhere()]]. The main difference is that this method will
200		* remove [[isEmpty()\|empty query operands]]. As a result, this method is best suited
201		* for building query conditions based on filter values entered by users.
202		*
203		* @param array $condition the new WHERE condition. Please refer to [[where()]]
204		* on how to specify this parameter.
205		* @return $this the query object itself
206		* @see filterWhere()
207		* @see andFilterWhere()
208		*/
209	3	public function orFilterWhere(array $condition)
210		{
211	3	$condition = $this->filterCondition($condition);
212	3	if ($condition !== []) {
213		$this->orWhere($condition);
214		}
215	3	return $this;
216		}
217
218		/**
219		* Removes [[isEmpty()\|empty operands]] from the given query condition.
220		*
221		* @param array $condition the original condition
222		* @return array the condition with [[isEmpty()\|empty operands]] removed.
223		* @throws NotSupportedException if the condition operator is not supported
224		*/
225	75	protected function filterCondition($condition)
226		{
227	75	if (!is_array($condition)) {
228	21	return $condition;
229		}
230
231	75	if (!isset($condition[0])) {
232		// hash format: 'column1' => 'value1', 'column2' => 'value2', ...
233	6	foreach ($condition as $name => $value) {
234	6	if ($this->isEmpty($value)) {
235	3	unset($condition[$name]);
236	3	}
237	6	}
238	6	return $condition;
239		}
240
241		// operator format: operator, operand 1, operand 2, ...
242
243	75	$operator = array_shift($condition);
244
245	75	switch (strtoupper($operator)) {
246	75	case 'NOT':
247	75	case 'AND':
248	75	case 'OR':
249	27	foreach ($condition as $i => $operand) {
250	27	$subCondition = $this->filterCondition($operand);
251	27	if ($this->isEmpty($subCondition)) {
252	27	unset($condition[$i]);
253	27	} else {
254	18	$condition[$i] = $subCondition;
255		}
256	27	}
257
258	27	if (empty($condition)) {
259	12	return [];
260		}
261	18	break;
262	54	case 'BETWEEN':
263	54	case 'NOT BETWEEN':
264	9	if (array_key_exists(1, $condition) && array_key_exists(2, $condition)) {
265	9	if ($this->isEmpty($condition[1]) \|\| $this->isEmpty($condition[2])) {
266	9	return [];
267		}
268		}
269		break;
270	48	default:
271	48	if (array_key_exists(1, $condition) && $this->isEmpty($condition[1])) {
272	48	return [];
273		}
274	63	}
275
276	24	array_unshift($condition, $operator);
277
278	24	return $condition;
279		}
280
281		/**
282		* Returns a value indicating whether the give value is "empty".
283		*
284		* The value is considered "empty", if one of the following conditions is satisfied:
285		*
286		* - it is `null`,
287		* - an empty string (`''`),
288		* - a string containing only whitespace characters,
289		* - or an empty array.
290		*
291		* @param mixed $value
292		* @return bool if the value is empty
293		*/
294	75	protected function isEmpty($value)
295		{
296	75	return $value === '' \|\| $value === [] \|\| $value === null \|\| is_string($value) && trim($value) === '';
297		}
298
299		/**
300		* Sets the ORDER BY part of the query.
301		* @param string\|array\|Expression $columns the columns (and the directions) to be ordered by.
302		* Columns can be specified in either a string (e.g. `"id ASC, name DESC"`) or an array
303		* (e.g. `['id' => SORT_ASC, 'name' => SORT_DESC]`).
304		*
305		* The method will automatically quote the column names unless a column contains some parenthesis
306		* (which means the column contains a DB expression).
307		*
308		* Note that if your order-by is an expression containing commas, you should always use an array
309		* to represent the order-by information. Otherwise, the method will not be able to correctly determine
310		* the order-by columns.
311		*
312		* Since version 2.0.7, an [[Expression]] object can be passed to specify the ORDER BY part explicitly in plain SQL.
313		* @return $this the query object itself
314		* @see addOrderBy()
315		*/
316	142	public function orderBy($columns)
317		{
318	142	$this->orderBy = $this->normalizeOrderBy($columns);
319	142	return $this;
320		}
321
322		/**
323		* Adds additional ORDER BY columns to the query.
324		* @param string\|array\|Expression $columns the columns (and the directions) to be ordered by.
325		* Columns can be specified in either a string (e.g. "id ASC, name DESC") or an array
326		* (e.g. `['id' => SORT_ASC, 'name' => SORT_DESC]`).
327		*
328		* The method will automatically quote the column names unless a column contains some parenthesis
329		* (which means the column contains a DB expression).
330		*
331		* Note that if your order-by is an expression containing commas, you should always use an array
332		* to represent the order-by information. Otherwise, the method will not be able to correctly determine
333		* the order-by columns.
334		*
335		* Since version 2.0.7, an [[Expression]] object can be passed to specify the ORDER BY part explicitly in plain SQL.
336		* @return $this the query object itself
337		* @see orderBy()
338		*/
339	36	public function addOrderBy($columns)
340		{
341	36	$columns = $this->normalizeOrderBy($columns);
342	36	if ($this->orderBy === null) {
343	15	$this->orderBy = $columns;
344	15	} else {
345	33	$this->orderBy = array_merge($this->orderBy, $columns);
346		}
347	36	return $this;
348		}
349
350		/**
351		* Normalizes format of ORDER BY data
352		*
353		* @param array\|string\|Expression $columns the columns value to normalize. See [[orderBy]] and [[addOrderBy]].
354		* @return array
355		*/
356	142	protected function normalizeOrderBy($columns)
357		{
358	142	if ($columns instanceof Expression) {
359	6	return [$columns];
360	142	} elseif (is_array($columns)) {
361	70	return $columns;
362		} else {
363	114	$columns = preg_split('/\s,\s/', trim($columns), -1, PREG_SPLIT_NO_EMPTY);
364	114	$result = [];
365	114	foreach ($columns as $column) {
366	114	if (preg_match('/^(.*?)\s+(asc\|desc)$/i', $column, $matches)) {
367	15	$result[$matches[1]] = strcasecmp($matches[2], 'desc') ? SORT_ASC : SORT_DESC;
368	15	} else {
369	111	$result[$column] = SORT_ASC;
370		}
371	114	}
372	114	return $result;
373		}
374		}
375
376		/**
377		* Sets the LIMIT part of the query.
378		* @param int $limit the limit. Use null or negative value to disable limit.
379		* @return $this the query object itself
380		*/
381	56	public function limit($limit)
382		{
383	56	$this->limit = $limit;
384	56	return $this;
385		}
386
387		/**
388		* Sets the OFFSET part of the query.
389		* @param int $offset the offset. Use null or negative value to disable offset.
390		* @return $this the query object itself
391		*/
392	33	public function offset($offset)
393		{
394	33	$this->offset = $offset;
395	33	return $this;
396		}
397
398		/**
399		* Sets whether to emulate query execution, preventing any interaction with data storage.
400		* After this mode is enabled, methods, returning query results like [[one()]], [[all()]], [[exists()]]
401		* and so on, will return empty or false values.
402		* You should use this method in case your program logic indicates query should not return any results, like
403		* in case you set false where condition like `0=1`.
404		* @param boolean $value whether to prevent query execution.
405		* @return $this the query object itself.
406		* @since 2.0.11
407		*/
408	21	public function emulateExecution($value = true)
409		{
410	21	$this->emulateExecution = $value;
411	21	return $this;
412		}
413		}
414

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