Query

Type

Class

Namespace

craft\db

Inherits

craft\db\Query » yii\db\Query » yii\base\Component » yii\base\BaseObject

Implements

yii\base\Configurable, yii\db\ExpressionInterface, yii\db\QueryInterface

Uses traits

craft\base\ClonefixTrait, yii\db\QueryTrait

Extended by

craft\elements\db\AssetQuery, craft\elements\db\CategoryQuery, craft\elements\db\ElementQuery, craft\elements\db\EntryQuery, craft\elements\db\GlobalSetQuery, craft\elements\db\MatrixBlockQuery, craft\elements\db\TagQuery, craft\elements\db\UserQuery, craft\test\mockclasses\elements\MockElementQuery

Since

3.0.0

Class Query

View source

Public Properties

Property	Description
behaviors	yii\base\Behavior – List of behaviors attached to this component.
distinct	boolean – Whether to select distinct rows of data only.
emulateExecution	boolean – Whether to emulate the actual query execution, returning empty or false results.
from	array, null – The table(s) to be selected from.
groupBy	array, null – How to group the query results.
having	string, array, yii\db\ExpressionInterface, null – The condition to be applied in the GROUP BY clause.
indexBy	string, callable, null – The name of the column by which the query results should be indexed by.
join	array, null – How to join with other tables.
limit	integer, yii\db\ExpressionInterface, null – Maximum number of records to be returned.
offset	integer, yii\db\ExpressionInterface, null – Zero-based offset from where the records are to be returned.
orderBy	array, null – How to sort the query results.
params	array, null – List of query parameter values indexed by parameter placeholders.
queryCacheDependency	yii\caching\Dependency, null – The dependency to be associated with the cached query result for this query
queryCacheDuration	integer, boolean, null – The default number of seconds that query results can remain valid in cache.
rawSql	string
select	array, null – The columns being selected.
selectOption	string, null – Additional option that should be appended to the 'SELECT' keyword.
tablesUsedInFrom	string[] – Table names indexed by aliases.
union	array, null – This is used to construct the UNION clause(s) in a SQL statement.
where	string, array, yii\db\ExpressionInterface, null – Query condition.
withQueries	array, null – This is used to construct the WITH section in a SQL query.

rawSql

Type

string

Default value

null

Access

Read-only

View source

Public Methods

Method	Description
__call()	Calls the named method which is not a class method.
__clone()	This method is called after the object is created by cloning an existing one.
__construct()	Constructor.
__get()	Returns the value of a component property.
__isset()	Checks if a property is set, i.e. defined and not null.
__set()	Sets the value of a component property.
__toString()	Returns the SQL representation of Query
__unset()	Sets a component property to be null.
addGroupBy()	Adds additional group-by columns to the existing ones.
addOrderBy()	Adds additional ORDER BY columns to the query.
addParams()	Adds additional parameters to be bound to the query.
addSelect()	Add more columns to the SELECT part of the query.
all()	Executes the query and returns all results as an array.
andFilterCompare()	Adds a filtering condition for a specific column and allow the user to choose a filter operator.
andFilterHaving()	Adds an additional HAVING condition to the existing one but ignores empty operands.
andFilterWhere()	Adds an additional WHERE condition to the existing one but ignores empty operands.
andHaving()	Adds an additional HAVING condition to the existing one.
andWhere()	Adds an additional WHERE condition to the existing one.
attachBehavior()	Attaches a behavior to this component.
attachBehaviors()	Attaches a list of behaviors to the component.
average()	Returns the average of the specified column values.
batch()	Starts a batch query.
behaviors()	Returns a list of behaviors that this component should behave as.
cache()	Enables query cache for this Query.
canGetProperty()	Returns a value indicating whether a property can be read.
canSetProperty()	Returns a value indicating whether a property can be set.
className()	Returns the fully qualified name of this class.
column()	Executes the query and returns the first column of the result.
count()	Returns the number of records.
create()	Creates a new Query object and copies its property values from an existing one.
createCommand()	Creates a DB command that can be used to execute this query.
detachBehavior()	Detaches a behavior from the component.
detachBehaviors()	Detaches all behaviors from the component.
distinct()	Sets the value indicating whether to SELECT DISTINCT or not.
each()	Starts a batch query and retrieves data row by row.
emulateExecution()	Sets whether to emulate query execution, preventing any interaction with data storage.
ensureBehaviors()	Makes sure that the behaviors declared in behaviors() are attached to this component.
exists()	Returns a value indicating whether the query result contains any row of data.
filterHaving()	Sets the HAVING part of the query but ignores empty operands.
filterWhere()	Sets the WHERE part of the query but ignores empty operands.
from()	Sets the FROM part of the query.
getBehavior()	Returns the named behavior object.
getBehaviors()	Returns all behaviors attached to this component.
getRawSql()	Shortcut for createCommand()->getRawSql().
getTablesUsedInFrom()	Returns table names used in from() indexed by aliases.
groupBy()	Sets the GROUP BY part of the query.
hasEventHandlers()	Returns a value indicating whether there is any handler attached to the named event.
hasMethod()	Returns a value indicating whether a method is defined.
hasProperty()	Returns a value indicating whether a property is defined for this component.
having()	Sets the HAVING part of the query.
indexBy()	Sets the indexBy() property.
init()	Initializes the object.
innerJoin()	Appends an INNER JOIN part to the query.
isJoined()	Returns whether a given table has been joined in this query.
join()	Appends a JOIN part to the query.
leftJoin()	Appends a LEFT OUTER JOIN part to the query.
limit()	Sets the LIMIT part of the query.
max()	Returns the maximum of the specified column values.
min()	Returns the minimum of the specified column values.
noCache()	Disables query cache for this Query.
nth()	Executes the query and returns a single row of result at a given offset.
off()	Detaches an existing event handler from this component.
offset()	Sets the OFFSET part of the query.
on()	Attaches an event handler to an event.
one()	Executes the query and returns a single row of result.
orFilterHaving()	Adds an additional HAVING condition to the existing one but ignores empty operands.
orFilterWhere()	Adds an additional WHERE condition to the existing one but ignores empty operands.
orHaving()	Adds an additional HAVING condition to the existing one.
orWhere()	Adds an additional WHERE condition to the existing one.
orderBy()	Sets the ORDER BY part of the query.
pairs()	Executes the query and returns the first two columns in the results as key/value pairs.
params()	Sets the parameters to be bound to the query.
populate()	Converts the raw query results into the format as specified by this query.
prepare()	Prepares for building SQL.
rightJoin()	Appends a RIGHT OUTER JOIN part to the query.
scalar()	Returns the query result as a scalar value.
select()	Sets the SELECT part of the query.
sum()	Returns the sum of the specified column values.
trigger()	Triggers an event.
union()	Appends a SQL statement using UNION operator.
where()	Sets the WHERE part of the query.
withQuery()	Prepends a SQL statement using WITH syntax.

all()

Executes the query and returns all results as an array.

View source

Arguments

• $db (yii\db\Connection, null) – The database connection used to generate the SQL statement. If this parameter is not given, the db application component will be used.

Returns

array – The query results. If the query results in nothing, an empty array will be returned.

andWhere()

Adds an additional WHERE condition to the existing one.

The new condition and the existing one will be joined using the AND operator.

View source

Arguments

• $condition (string, array, yii\db\ExpressionInterface) – The new WHERE condition. Please refer to where() on how to specify this parameter.
• $params (array) – The parameters (name => value) to be bound to the query.

Returns

$this – The query object itself

behaviors()

Returns a list of behaviors that this component should behave as.

Child classes may override this method to specify the behaviors they want to behave as.

The return value of this method should be an array of behavior objects or configurations indexed by behavior names. A behavior configuration can be either a string specifying the behavior class or an array of the following structure:

'behaviorName' => [
    'class' => 'BehaviorClass',
    'property1' => 'value1',
    'property2' => 'value2',
]

Note that a behavior class must extend from \craft\db\Behavior. Behaviors can be attached using a name or anonymously. When a name is used as the array key, using this name, the behavior can later be retrieved using getBehavior() or be detached using detachBehavior(). Anonymous behaviors can not be retrieved or detached.

Behaviors declared in this method will be attached to the component automatically (on demand).

View source

Returns

array – The behavior configurations.

column()

Executes the query and returns the first column of the result.

View source

Arguments

• $db (yii\db\Connection, null) – The database connection used to generate the SQL statement. If this parameter is not given, the db application component will be used.

Returns

array – The first column of the query result. An empty array is returned if the query results in nothing.

exists()

Returns a value indicating whether the query result contains any row of data.

View source

Arguments

• $db (yii\db\Connection, null) – The database connection used to generate the SQL statement. If this parameter is not given, the db application component will be used.

Returns

boolean – Whether the query result contains any row of data.

getRawSql()

Shortcut for createCommand()->getRawSql().

See also:

• createCommand()
• yii\db\Command::getRawSql()

View source

Arguments

• $db (yii\db\Connection, null) – The database connection used to generate the SQL statement. If this parameter is not given, the db application component will be used.

Returns

string

init()

Initializes the object.

This method is invoked at the end of the constructor after the object is initialized with the given configuration.

View source

isJoined()

Returns whether a given table has been joined in this query.

View source

Arguments

• $table (string)

Returns

boolean

nth()

Executes the query and returns a single row of result at a given offset.

View source

Arguments

• $n (integer) – The offset of the row to return. If offset() is set, $offset will be added to it.
• $db (yii\db\Connection, null) – The database connection used to generate the SQL statement. If this parameter is not given, the db application component will be used.

Returns

array, null – The row (in terms of an array) of the query result. Null is returned if the query results in nothing.

one()

Executes the query and returns a single row of result.

View source

Arguments

• $db (yii\db\Connection, null) – The database connection used to generate the SQL statement. If this parameter is not given, the db application component will be used.

Returns

mixed, null – First row of the query result array, or null if there are no query results.

orWhere()

Adds an additional WHERE condition to the existing one.

The new condition and the existing one will be joined using the OR operator.

View source

Arguments

• $condition (string, array, yii\db\ExpressionInterface) – The new WHERE condition. Please refer to where() on how to specify this parameter.
• $params (array) – The parameters (name => value) to be bound to the query.

Returns

$this – The query object itself

pairs()

Executes the query and returns the first two columns in the results as key/value pairs.

View source

Arguments

• $db (yii\db\Connection, null) – The database connection used to execute the query. If this parameter is not given, the db application component will be used.

Returns

array – The query results. If the query results in nothing, an empty array will be returned.

Throws

• yii\base\Exception
  if less than two columns were selected

scalar()

Returns the query result as a scalar value.

The value returned will be the first column in the first row of the query results.

View source

Arguments

• $db (yii\db\Connection, null) – The database connection used to generate the SQL statement. If this parameter is not given, the db application component will be used.

Returns

string, integer, null, false – The value of the first column in the first row of the query result. False is returned if the query result is empty.

where()

Sets the WHERE part of the query.

The method requires a $condition parameter, and optionally a $params parameter specifying the values to be bound to the query.

The $condition parameter should be either a string (e.g. 'id=1') or an array.

View source

Arguments

• $condition (string, array, yii\db\ExpressionInterface) – The conditions that should be put in the WHERE part.
• $params (array) – The parameters (name => value) to be bound to the query.

Returns

$this – The query object itself

Protected Methods

Method	Description
cleanUpTableNames()	Clean up table names and aliases Both aliases and names are enclosed into .
filterCondition()	Removes empty operands from the given query condition.
getUnaliasedColumnsFromSelect()
getUniqueColumns()	Returns unique column names excluding duplicates.
isEmpty()	Returns a value indicating whether the give value is "empty".
normalizeOrderBy()	Normalizes format of ORDER BY data.
normalizeSelect()	Normalizes the SELECT columns passed to select() or addSelect().
queryScalar()	Queries a scalar value by setting select() first.
setCommandCache()	Sets $command cache, if this query has enabled caching.

queryScalar()

Queries a scalar value by setting select() first.

Restores the value of select to make this query reusable.

View source

Arguments

• $selectExpression (string, yii\db\ExpressionInterface)
• $db (yii\db\Connection, null) – The database connection used to execute the query.

Returns

boolean, string, null

Throws

• Throwable
  if can't create command

Events

EVENT_DEFINE_BEHAVIORS

Type

craft\events\DefineBehaviorsEvent

The event that is triggered when defining the class behaviors

See also behaviors()

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EVENT_INIT

Type

yii\base\Event

The event that is triggered after the query's init cycle

See also init()

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