Class CaseExpression

This class represents a SQL Case statement

Namespace: Cake\Database\Expression

Properties summary

  • $_conditions protected
    array

    A list of strings or other expression objects that represent the conditions of the case statement. For example one key of the array might look like "sum > :value"

  • $_elseValue protected
    string|\Cake\Database\ExpressionInterface|array|null

    The ELSE value for the case statement. If null then no ELSE will be included.

  • $_values protected
    array

    Values that are associated with the conditions in the $_conditions array.

Method Summary

  • __construct() public

    Constructs the case expression

  • _addExpressions() protected

    Iterates over the passed in conditions and ensures that there is a matching true value for each.

  • _castToExpression() protected

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

  • _compile() protected

    Compiles the relevant parts into sql

  • _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.

  • add() public

    Adds one or more conditions and their respective true values to the case object.

  • elseValue() public

    Sets the default value

  • sql() public

    Converts the Node into a SQL string 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

__construct() public 

__construct(mixed $conditions, mixed $values, mixed $types)

Constructs the case expression

Parameters

array|\Cake\Database\ExpressionInterface $conditions optional

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

_addExpressions() protected 

_addExpressions(array $conditions, array $values, array $types)

Iterates over the passed in conditions and ensures that there is a matching true value for each.

If no matching true value, then it is defaulted to '1'.

Parameters

array $conditions

Array of ExpressionInterface instances.

array $values

associative array of values of each condition

array $types

associative array of types to be associated with the values

_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|null $type optional

The type name

Returns

mixed

_compile() protected 

_compile(mixed $part, \Cake\Database\ValueBinder $generator)

Compiles the relevant parts into sql

Parameters

array|string|\Cake\Database\ExpressionInterface $part

The part to compile

\Cake\Database\ValueBinder $generator

Sql generator

Returns

string

_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

add() public 

add(mixed $conditions, mixed $values, mixed $types)

Adds one or more conditions and their respective true values to the case object.

Conditions must be a one dimensional array or a QueryExpression. The trueValues must be a similar structure, but may contain a string value.

Parameters

array|\Cake\Database\ExpressionInterface $conditions optional

Must be a ExpressionInterface instance, or an array of ExpressionInterface instances.

array|\Cake\Database\ExpressionInterface $values optional

associative array of values of each condition

array $types optional

associative array of types to be associated with the values

Returns

$this

elseValue() public 

elseValue(mixed $value, ?string $type)

Sets the default value

Parameters

\Cake\Database\ExpressionInterface|string|array|null $value optional

Value to set

string|null $type optional

Type of value

sql() public 

sql(\Cake\Database\ValueBinder $generator)

Converts the Node into a SQL string fragment.

Parameters

\Cake\Database\ValueBinder $generator

Placeholder generator object

Returns

string

traverse() public 

traverse(\Closure $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

\Closure $visitor

The callable to apply to all nodes.

Returns

$this

Property Detail

$_conditions protected

A list of strings or other expression objects that represent the conditions of the case statement. For example one key of the array might look like "sum > :value"

Type

array

$_elseValue protected

The ELSE value for the case statement. If null then no ELSE will be included.

Type

string|\Cake\Database\ExpressionInterface|array|null

$_values protected

Values that are associated with the conditions in the $_conditions array.

Each value represents the 'true' value for the condition with the corresponding key.

Type

array

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https://api.cakephp.org/4.0/class-Cake.Database.Expression.CaseExpression.html