Class FunctionExpression

This class represents a function call string in a SQL statement. Calls can be constructed by passing the name of the function and a list of params. For security reasons, all params passed are quoted by default unless explicitly told otherwise.

Cake\Database\Expression\QueryExpression implements Cake\Database\ExpressionInterface, Countable uses Cake\Database\TypeMapTrait

Cake\Database\Expression\FunctionExpression implements Cake\Database\TypedResultInterface uses Cake\Database\Type\ExpressionTypeCasterTrait , Cake\Database\TypedResultTrait

Namespace: Cake\Database\Expression
Location: Database/Expression/FunctionExpression.php

Properties summary

$_name protected

string

The name of the function to be constructed when generating the SQL string

Inherited Properties

_conditions, _conjunction _typeMap _returnType

Method Summary

__construct() public

Constructor. Takes a name for the function to be invoked and a list of params to be passed into the function. Optionally you can pass a list of types to be used for each bound param.
add() public

Adds one or more arguments for the function call.
count() public

The name of the function is in itself an expression to generate, thus always adding 1 to the amount of expressions stored in this object.
getName() public

Gets the name of the SQL function to be invoke in this expression.
name() public

Sets the name of the SQL function to be invoke in this expression, if no value is passed it will return current name
setName() public

Sets the name of the SQL function to be invoke in this expression.
sql() public

Returns the string representation of this object so that it can be used in a SQL query. Note that values condition values are not included in the string, in their place placeholders are put and can be replaced by the quoted values accordingly.

Method Detail

__construct() public ¶

__construct( string $name , array $params [] , array $types [] , string $returnType 'string' )

Constructor. Takes a name for the function to be invoked and a list of params to be passed into the function. Optionally you can pass a list of types to be used for each bound param.

By default, all params that are passed will be quoted. If you wish to use literal arguments, you need to explicitly hint this function.

Examples:

$f = new FunctionExpression('CONCAT', ['CakePHP', ' rules']);

Previous line will generate CONCAT('CakePHP', ' rules')

$f = new FunctionExpression('CONCAT', ['name' => 'literal', ' rules']);

Will produce CONCAT(name, ' rules')

Parameters

string $name: the name of the function to be constructed
array $params optional []: list of arguments to be passed to the function If associative the key would be used as argument when value is 'literal'
array $types optional []: associative array of types to be associated with the passed arguments
string $returnType optional 'string': The return type of this expression

Overrides

Cake\Database\Expression\QueryExpression::__construct()

add() public ¶

add( array $params , array $types [] , boolean $prepend false )

Adds one or more arguments for the function call.

Parameters

array $params: list of arguments to be passed to the function If associative the key would be used as argument when value is 'literal'
array $types optional []: associative array of types to be associated with the passed arguments
boolean $prepend optional false: Whether to prepend or append to the list of arguments

Returns

$this

See

\Cake\Database\Expression\FunctionExpression::__construct() for more details.

Overrides

Cake\Database\Expression\QueryExpression::add()

count() public ¶

count( )

The name of the function is in itself an expression to generate, thus always adding 1 to the amount of expressions stored in this object.

Returns

integer

Overrides

Cake\Database\Expression\QueryExpression::count()

getName() public ¶

getName( )

Gets the name of the SQL function to be invoke in this expression.

Returns

string

name() public ¶

name( string|null $name null )

Sets the name of the SQL function to be invoke in this expression, if no value is passed it will return current name

Deprecated

3.4.0 Use setName()/getName() instead.

Parameters

string|null $name optional null: The name of the function

Returns

string|Cake\Database\Expression\FunctionExpression
$this

setName() public ¶

setName( string $name )

Sets the name of the SQL function to be invoke in this expression.

Parameters

string $name: The name of the function

Returns

$this

sql() public ¶

sql( Cake\Database\ValueBinder $generator )

Returns the string representation of this object so that it can be used in a SQL query. Note that values condition values are not included in the string, in their place placeholders are put and can be replaced by the quoted values accordingly.

Parameters

Cake\Database\ValueBinder $generator: Placeholder generator object

Returns

string

Overrides

Cake\Database\Expression\QueryExpression::sql()

Methods inherited from Cake\Database\Expression\QueryExpression

__call() public ¶

__call( string $method , array $args )

Helps calling the and() and or() methods transparently.

Parameters

string $method: The method name.
array $args: The arguments to pass to the method.

Returns

Cake\Database\Expression\QueryExpression

Throws

BadMethodCallException

__clone() public ¶

__clone( )

Clone this object and its subtree of expressions.

_addConditions() protected ¶

_addConditions( array $conditions , array $types )

Auxiliary function used for decomposing a nested array of conditions and build a tree structure inside this object to represent the full SQL expression. String conditions are stored directly in the conditions, while any other representation is wrapped around an adequate instance or of this class.

Parameters

array $conditions: list of conditions to be stored in this object
array $types: list of types associated on fields referenced in $conditions

_calculateType() protected ¶

_calculateType( string|Cake\Database\Expression\IdentifierExpression $field )

Returns the type name for the passed field if it was stored in the typeMap

Parameters

string|Cake\Database\Expression\IdentifierExpression $field: The field name to get a type for.

Returns

string|null
The computed type or null, if the type is unknown.

_parseCondition() protected ¶

_parseCondition( string $field , mixed $value )

Parses a string conditions by trying to extract the operator inside it if any and finally returning either an adequate QueryExpression object or a plain string representation of the condition. This function is responsible for generating the placeholders and replacing the values by them, while storing the value elsewhere for future binding.

Parameters

string $field: The value from with the actual field and operator will be extracted.
mixed $value: The value to be bound to a placeholder for the field

Returns

string|Cake\Database\ExpressionInterface

addCase() public ¶

addCase( array|Cake\Database\ExpressionInterface $conditions , array|Cake\Database\ExpressionInterface $values [] , array $types [] )

Adds a new case expression to the expression object

Parameters

array|Cake\Database\ExpressionInterface $conditions: The conditions to test. Must be a ExpressionInterface instance, or an array of ExpressionInterface instances.
array|Cake\Database\ExpressionInterface $values optional []: associative array of values to be associated with the conditions passed in $conditions. If there are more $values than $conditions, the last $value is used as the ELSE value
array $types optional []: associative array of types to be associated with the values passed in $values

Returns

$this

and_() public ¶

and_( callable|string|array|Cake\Database\ExpressionInterface $conditions , array $types [] )

Returns a new QueryExpression object containing all the conditions passed and set up the conjunction to be "AND"

Parameters

callable|string|array|Cake\Database\ExpressionInterface $conditions: to be joined with AND
array $types optional []: associative array of fields pointing to the type of the values that are being passed. Used for correctly binding values to statements.

Returns

Cake\Database\Expression\QueryExpression

between() public ¶

between( string|Cake\Database\ExpressionInterface $field , mixed $from , mixed $to , string|null $type null )

Adds a new condition to the expression object in the form "field BETWEEN from AND to".

Parameters

string|Cake\Database\ExpressionInterface $field: The field name to compare for values in between the range.
mixed $from: The initial value of the range.
mixed $to: The ending value in the comparison range.
string|null $type optional null: the type name for $value as configured using the Type map.

Returns

$this

eq() public ¶

eq( string|Cake\Database\ExpressionInterface $field , mixed $value , string|null $type null )

Adds a new condition to the expression object in the form "field = value".

Parameters

string|Cake\Database\ExpressionInterface $field: Database field to be compared against value
mixed $value: The value to be bound to $field for comparison
string|null $type optional null: the type name for $value as configured using the Type map. If it is suffixed with "[]" and the value is an array then multiple placeholders will be created, one per each value in the array.

Returns

$this

equalFields() public ¶

equalFields( string $left , string $right )

Builds equal condition or assignment with identifier wrapping.

Parameters

string $left: Left join condition field name.
string $right: Right join condition field name.

Returns

$this

exists() public ¶

exists( Cake\Database\ExpressionInterface $query )

Adds a new condition to the expression object in the form "EXISTS (...)".

Parameters

Cake\Database\ExpressionInterface $query: the inner query

Returns

$this

getConjunction() public ¶

getConjunction( )

Gets the currently configured conjunction for the conditions at this level of the expression tree.

Returns

string

gt() public ¶

gt( string|Cake\Database\ExpressionInterface $field , mixed $value , string|null $type null )

Adds a new condition to the expression object in the form "field > value".

Parameters

string|Cake\Database\ExpressionInterface $field: Database field to be compared against value
mixed $value: The value to be bound to $field for comparison
string|null $type optional null: the type name for $value as configured using the Type map.

Returns

$this

gte() public ¶

gte( string|Cake\Database\ExpressionInterface $field , mixed $value , string|null $type null )

Adds a new condition to the expression object in the form "field >= value".

Parameters

string|Cake\Database\ExpressionInterface $field: Database field to be compared against value
mixed $value: The value to be bound to $field for comparison
string|null $type optional null: the type name for $value as configured using the Type map.

Returns

$this

hasNestedExpression() public ¶

hasNestedExpression( )

Returns true if this expression contains any other nested ExpressionInterface objects

Returns

boolean

in() public ¶

in( string|Cake\Database\ExpressionInterface $field , string|array $values , string|null $type null )

Adds a new condition to the expression object in the form "field IN (value1, value2)".

Parameters

string|Cake\Database\ExpressionInterface $field: Database field to be compared against value
string|array $values: the value to be bound to $field for comparison
string|null $type optional null: the type name for $value as configured using the Type map.

Returns

$this

isCallable() public ¶

isCallable( callable $c )

Check whether or not a callable is acceptable.

We don't accept ['class', 'method'] style callbacks, as they often contain user input and arrays of strings are easy to sneak in.

Parameters

callable $c: The callable to check.

Returns

boolean
Valid callable.

isNotNull() public ¶

isNotNull( string|Cake\Database\ExpressionInterface $field )

Adds a new condition to the expression object in the form "field IS NOT NULL".

Parameters

string|Cake\Database\ExpressionInterface $field: database field to be tested for not null

Returns

$this

isNull() public ¶

isNull( string|Cake\Database\ExpressionInterface $field )

Adds a new condition to the expression object in the form "field IS NULL".

Parameters

string|Cake\Database\ExpressionInterface $field: database field to be tested for null

Returns

$this

iterateParts() public ¶

iterateParts( callable $callable )

Executes a callable function for each of the parts that form this expression.

The callable function is required to return a value with which the currently visited part will be replaced. If the callable function returns null then the part will be discarded completely from this expression.

The callback function will receive each of the conditions as first param and the key as second param. It is possible to declare the second parameter as passed by reference, this will enable you to change the key under which the modified part is stored.

Parameters

callable $callable: The callable to apply to each part.

Returns

$this

like() public ¶

like( string|Cake\Database\ExpressionInterface $field , mixed $value , string|null $type null )

Adds a new condition to the expression object in the form "field LIKE value".

Parameters

string|Cake\Database\ExpressionInterface $field: Database field to be compared against value
mixed $value: The value to be bound to $field for comparison
string|null $type optional null: the type name for $value as configured using the Type map.

Returns

$this

lt() public ¶

lt( string|Cake\Database\ExpressionInterface $field , mixed $value , string|null $type null )

Adds a new condition to the expression object in the form "field < value".

Parameters

string|Cake\Database\ExpressionInterface $field: Database field to be compared against value
mixed $value: The value to be bound to $field for comparison
string|null $type optional null: the type name for $value as configured using the Type map.

Returns

$this

lte() public ¶

lte( string|Cake\Database\ExpressionInterface $field , mixed $value , string|null $type null )

Adds a new condition to the expression object in the form "field <= value".

Parameters

string|Cake\Database\ExpressionInterface $field: Database field to be compared against value
mixed $value: The value to be bound to $field for comparison
string|null $type optional null: the type name for $value as configured using the Type map.

Returns

$this

not() public ¶

not( string|array|Cake\Database\ExpressionInterface $conditions , array $types [] )

Adds a new set of conditions to this level of the tree and negates the final result by prepending a NOT, it will look like "NOT ( (condition1) AND (conditions2) )" conjunction depends on the one currently configured for this object.

Parameters

string|array|Cake\Database\ExpressionInterface $conditions: to be added and negated
array $types optional []: associative array of fields pointing to the type of the values that are being passed. Used for correctly binding values to statements.

Returns

$this

notEq() public ¶

notEq( string|Cake\Database\ExpressionInterface $field , mixed $value , string|null $type null )

Adds a new condition to the expression object in the form "field != value".

Parameters

string|Cake\Database\ExpressionInterface $field: Database field to be compared against value
mixed $value: The value to be bound to $field for comparison
string|null $type optional null: the type name for $value as configured using the Type map. If it is suffixed with "[]" and the value is an array then multiple placeholders will be created, one per each value in the array.

Returns

$this

notExists() public ¶

notExists( Cake\Database\ExpressionInterface $query )

Adds a new condition to the expression object in the form "NOT EXISTS (...)".

Parameters

Cake\Database\ExpressionInterface $query: the inner query

Returns

$this

notIn() public ¶

notIn( string|Cake\Database\ExpressionInterface $field , array $values , string|null $type null )

Adds a new condition to the expression object in the form "field NOT IN (value1, value2)".

Parameters

string|Cake\Database\ExpressionInterface $field: Database field to be compared against value
array $values: the value to be bound to $field for comparison
string|null $type optional null: the type name for $value as configured using the Type map.

Returns

$this

notLike() public ¶

notLike( string|Cake\Database\ExpressionInterface $field , mixed $value , string|null $type null )

Adds a new condition to the expression object in the form "field NOT LIKE value".

Parameters

string|Cake\Database\ExpressionInterface $field: Database field to be compared against value
mixed $value: The value to be bound to $field for comparison
string|null $type optional null: the type name for $value as configured using the Type map.

Returns

$this

or_() public ¶

or_( callable|string|array|Cake\Database\ExpressionInterface $conditions , array $types [] )

Returns a new QueryExpression object containing all the conditions passed and set up the conjunction to be "OR"

Parameters

callable|string|array|Cake\Database\ExpressionInterface $conditions: to be joined with OR
array $types optional []: associative array of fields pointing to the type of the values that are being passed. Used for correctly binding values to statements.

Returns

Cake\Database\Expression\QueryExpression

setConjunction() public ¶

setConjunction( string $conjunction )

Changes the conjunction for the conditions at this level of the expression tree.

Parameters

string $conjunction: Value to be used for joining conditions

Returns

$this

tieWith() public ¶

tieWith( string|null $conjunction null )

Changes the conjunction for the conditions at this level of the expression tree. If called with no arguments it will return the currently configured value.

Deprecated

3.4.0 Use setConjunction()/getConjunction() instead.

Parameters

string|null $conjunction optional null: value to be used for joining conditions. If null it will not set any value, but return the currently stored one

Returns

string|Cake\Database\Expression\QueryExpression
$this

traverse() public ¶

traverse( callable $callable )

Traverses the tree structure of this query expression by executing a callback function for each of the conditions that are included in this object. Useful for compiling the final expression, or doing introspection in the structure.

Callback function receives as only argument an instance of ExpressionInterface

Parameters

callable $callable: The callable to apply to all sub-expressions.

Implementation of

Cake\Database\ExpressionInterface::traverse()

type() public ¶

type( string|null $conjunction null )

Backwards compatible wrapper for tieWith()

Deprecated

3.2.0 Use setConjunction()/getConjunction() instead

Parameters

string|null $conjunction optional null: value to be used for joining conditions. If null it will not set any value, but return the currently stored one

Returns

string|Cake\Database\Expression\QueryExpression
$this

Methods used from Cake\Database\Type\ExpressionTypeCasterTrait

_castToExpression() protected ¶

_castToExpression( mixed $value , string $type )

Conditionally converts the passed value to an ExpressionInterface object if the type class implements the ExpressionTypeInterface. Otherwise, returns the value unmodified.

Parameters

mixed $value: The value to converto to ExpressionInterface
string $type: The type name

Returns

mixed

_requiresToExpressionCasting() protected ¶

_requiresToExpressionCasting( array $types )

Returns an array with the types that require values to be casted to expressions, out of the list of type names passed as parameter.

Parameters

array $types: List of type names

Returns

array

Methods used from Cake\Database\TypedResultTrait

getReturnType() public ¶

getReturnType( )

Gets the type of the value this object will generate.

Returns

string

returnType() public ¶

returnType( string|null $type null )

Sets the type of the value this object will generate. If called without arguments, returns the current known type

Deprecated

3.5.0 Use getReturnType()/setReturnType() instead.

Parameters

string|null $type optional null: The name of the type that is to be returned

Returns

string|Cake\Database\TypedResultTrait
$this

setReturnType() public ¶

setReturnType( string $type )

Sets the type of the value this object will generate.

Parameters

string $type: The name of the type that is to be returned

Returns

$this

Methods used from Cake\Database\TypeMapTrait

defaultTypes() public ¶

defaultTypes( array $types null )

Allows setting default types when chaining query

Deprecated

3.4.0 Use setDefaultTypes()/getDefaultTypes() instead.

Parameters

array $types optional null: The array of types to set.

Returns

$this|array

getDefaultTypes() public ¶

getDefaultTypes( )

Gets default types of current type map.

Returns

array

getTypeMap() public ¶

getTypeMap( )

Returns the existing type map.

Returns

Cake\Database\TypeMap

setDefaultTypes() public ¶

setDefaultTypes( array $types )

Allows setting default types when chaining query.

Parameters

array $types: The array of types to set.

Returns

$this

setTypeMap() public ¶

setTypeMap( array|Cake\Database\TypeMap $typeMap )

Creates a new TypeMap if $typeMap is an array, otherwise exchanges it for the given one.

Parameters

array|Cake\Database\TypeMap $typeMap: Creates a TypeMap if array, otherwise sets the given TypeMap

Returns

$this

typeMap() public ¶

typeMap( array|Cake\Database\TypeMap|null $typeMap null )

Creates a new TypeMap if $typeMap is an array, otherwise returns the existing type map or exchanges it for the given one.

Deprecated

3.4.0 Use setTypeMap()/getTypeMap() instead.

Parameters

array|Cake\Database\TypeMap|null $typeMap optional null: Creates a TypeMap if array, otherwise sets the given TypeMap

Returns

$this|\Cake\Database\TypeMap

Magic methods inherited from Cake\Database\TypedResultInterface


				getReturnType()

Properties detail

`$_name` ¶

protected string

The name of the function to be constructed when generating the SQL string

Namespaces

Classes

Interfaces

Traits

Class FunctionExpression

Properties summary

Inherited Properties

Method Summary

__construct() public

add() public

count() public

getName() public

name() public

setName() public

sql() public

Method Detail

__construct() public ¶

Examples:

Parameters

Overrides

add() public ¶

Parameters

Returns

See

Overrides

count() public ¶

Returns

Overrides

getName() public ¶

Returns

name() public ¶

Deprecated

Parameters

Returns

setName() public ¶

Parameters

Returns

sql() public ¶

Parameters

Returns

Overrides

Methods inherited from Cake\Database\Expression\QueryExpression

__call() public ¶

Parameters

Returns

Throws

__clone() public ¶

_addConditions() protected ¶

Parameters

_calculateType() protected ¶

Parameters

Returns

_parseCondition() protected ¶

Parameters

Returns

addCase() public ¶

Parameters

Returns

and_() public ¶

Parameters

Returns

between() public ¶

Parameters

Returns

eq() public ¶

Parameters

Returns

equalFields() public ¶

Parameters

Returns

exists() public ¶

Parameters

Returns

getConjunction() public ¶

Returns

gt() public ¶

Parameters

Returns

gte() public ¶

Parameters