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Class Comparison

A Comparison is a type of query expression that represents an operation involving a field an operator and a value. In its most common form the string representation of a comparison is field = value

Namespace: Cake\Database\Expression

Properties summary

  • $_field protected
    string|\Cake\Database\ExpressionInterface

    The field name or expression to be used in the left hand side of the operator

  • $_isMultiple protected
    bool

    Whether or not the value in this expression is a traversable

  • $_operator protected
    string

    The operator used for comparing field and value

  • $_type protected
    string|array

    The type to be used for casting the value to a database representation

  • $_value protected
    mixed

    The value to be used in the right hand side of the operation

  • $_valueExpressions protected
    \Cake\Database\ExpressionInterface[]

    A cached list of ExpressionInterface objects that were found in the value for this expression.

Method Summary

  • __clone() public

    Create a deep clone.

  • __construct() public

    Constructor

  • _bindValue() protected

    Registers a value in the placeholder generator and returns the generated placeholder

  • _castToExpression() protected

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

  • _collectExpressions() protected

    Returns an array with the original $values in the first position and all ExpressionInterface objects that could be found in the second position.

  • _flattenValue() protected

    Converts a traversable value into a set of placeholders generated by $generator and separated by ,

  • _requiresToExpressionCasting() protected

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

  • _stringExpression() protected

    Returns a template and a placeholder for the value after registering it with the placeholder $generator

  • getField() public

    Returns the field name

  • getOperator() public

    Returns the operator used for comparison

  • getValue() public

    Returns the value used for comparison

  • setField() public

    Sets the field name

  • setOperator() public

    Sets the operator to use for the comparison

  • setValue() public

    Sets the value

  • sql() public

    Convert the expression into a SQL fragment.

  • traverse() public

    Iterates over each part of the expression recursively for every level of the expressions tree and executes the $visitor callable passing as first parameter the instance of the expression currently being iterated.

Method Detail

__clone() public

__clone()

Create a deep clone.

Clones the field and value if they are expression objects.

__construct() public

__construct(mixed $field, mixed $value, mixed $type, mixed $operator)

Constructor

Parameters

string|\Cake\Database\ExpressionInterface $field

the field name to compare to a value

mixed $value

The value to be used in comparison

string|null $type

the type name used to cast the value

string $operator

the operator used for comparing field and value

_bindValue() protected

_bindValue(mixed $value, mixed $generator, mixed $type)

Registers a value in the placeholder generator and returns the generated placeholder

Parameters

mixed $value

The value to bind

\Cake\Database\ValueBinder $generator

The value binder to use

string $type

The type of $value

Returns

string

generated placeholder

_castToExpression() protected

_castToExpression(mixed $value, mixed $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

_collectExpressions() protected

_collectExpressions(mixed $values)

Returns an array with the original $values in the first position and all ExpressionInterface objects that could be found in the second position.

Parameters

array|\Traversable $values

The rows to insert

Returns

array

_flattenValue() protected

_flattenValue(mixed $value, mixed $generator, mixed $type)

Converts a traversable value into a set of placeholders generated by $generator and separated by ,

Parameters

array|\Traversable $value

the value to flatten

\Cake\Database\ValueBinder $generator

The value binder to use

string|array|null $type optional

the type to cast values to

Returns

string

_requiresToExpressionCasting() protected

_requiresToExpressionCasting(mixed $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

_stringExpression() protected

_stringExpression(mixed $generator)

Returns a template and a placeholder for the value after registering it with the placeholder $generator

Parameters

\Cake\Database\ValueBinder $generator

The value binder to use.

Returns

array

First position containing the template and the second a placeholder

getField() public

getField()

Returns the field name

Returns

string|\Cake\Database\ExpressionInterface

getOperator() public

getOperator()

Returns the operator used for comparison

Returns

string

getValue() public

getValue()

Returns the value used for comparison

Returns

mixed

setField() public

setField(mixed $field)

Sets the field name

Parameters

string|\Cake\Database\ExpressionInterface $field

The field to compare with.

setOperator() public

setOperator(mixed $operator)

Sets the operator to use for the comparison

Parameters

string $operator

The operator to be used for the comparison.

setValue() public

setValue(mixed $value)

Sets the value

Parameters

mixed $value

The value to compare

sql() public

sql(\Cake\Database\ValueBinder $generator)

Convert the expression into a SQL fragment.

Parameters

\Cake\Database\ValueBinder $generator

Placeholder generator object

Returns

string

traverse() public

traverse(callable $visitor)

Iterates over each part of the expression recursively for every level of the expressions tree and executes the $visitor callable passing as first parameter the instance of the expression currently being iterated.

Parameters

callable $visitor

The callable to apply to all nodes.

Property Detail

$_field protected

The field name or expression to be used in the left hand side of the operator

Type

string|\Cake\Database\ExpressionInterface

$_isMultiple protected

Whether or not the value in this expression is a traversable

Type

bool

$_operator protected

The operator used for comparing field and value

Type

string

$_type protected

The type to be used for casting the value to a database representation

Type

string|array

$_value protected

The value to be used in the right hand side of the operation

Type

mixed

$_valueExpressions protected

A cached list of ExpressionInterface objects that were found in the value for this expression.

Type

\Cake\Database\ExpressionInterface[]

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https://api.cakephp.org/3.9/class-Cake.Database.Expression.Comparison.html