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<?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 <qiang.xue@gmail.com>
* @author Carsten Brandt <mail@cebe.cc>
* @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|ExpressionInterface maximum number of records to be returned. May be an instance of [[ExpressionInterface]].
* If not set or less than 0, it means no limit.
*/
public $limit;
/**
* @var int|ExpressionInterface zero-based offset from where the records are to be returned.
* May be an instance of [[ExpressionInterface]]. 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 [[ExpressionInterface]] objects. If that is the case, the expressions
* will be converted into strings without any change.
*/
public $orderBy;
/**
* @var string|callable 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 bool 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 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 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 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|ExpressionInterface $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 [[ExpressionInterface]] 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|ExpressionInterface $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 [[ExpressionInterface]] 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|ExpressionInterface $columns the columns value to normalize. See [[orderBy]] and [[addOrderBy]].
* @return array
*/
protected function normalizeOrderBy($columns)
{
if ($columns instanceof ExpressionInterface) {
return [$columns];
} elseif (is_array($columns)) {
return $columns;
}
$columns = preg_split('/\s*,\s*/', trim($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|ExpressionInterface|null $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|ExpressionInterface|null $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 [[QueryInterface::one()]],
* [[QueryInterface::all()]], [[QueryInterface::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 bool $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;
}
}