Class WhenThenExpression

Represents a SQL when/then clause with a fluid API

Namespace: Cake\Database\Expression

Property Summary

$_typeMap protected

Cake\Database\TypeMap

The type map to use when using an array of conditions for the WHEN value.
$hasThenBeenDefined protected

bool

Whether the THEN value has been defined, eg whether then() has been invoked.
$then protected

Cake\Database\ExpressionInterface|object|scalar|null

The THEN value.
$thenType protected

string|null

The THEN result type.
$validClauseNames protected

list<string>

The names of the clauses that are valid for use with the clause() method.
$when protected

Cake\Database\ExpressionInterface|object|scalar|null

Then WHEN value.
$whenType protected

array|string|null

The WHEN value type.

Method Summary

__clone() public

Clones the inner expression objects.
__construct() public

Constructor.
_castToExpression() protected

Conditionally converts the passed value to an ExpressionInterface object if the type class implements the ExpressionTypeInterface. Otherwise, returns the value unmodified.
_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.
clause() public

Returns the available data for the given clause.
compileNullableValue() protected

Compiles a nullable value to SQL.
getResultType() public

Returns the expression's result value type.
inferType() protected

Infers the abstract type for the given value.
sql() public

Converts the Node into a SQL string fragment.
then() public

Sets the THEN result value.
traverse() public

Iterates over each part of the expression recursively for every level of the expressions tree and executes the callback, passing as first parameter the instance of the expression currently being iterated.
when() public

Sets the WHEN value.

Method Detail

__clone() ¶ public

__clone(): void

Clones the inner expression objects.

Returns

void

__construct() ¶ public

__construct(Cake\Database\TypeMap|null $typeMap = null)

Constructor.

Parameters

Cake\Database\TypeMap|null $typeMap optional: The type map to use when using an array of conditions for the WHEN value.

_castToExpression() ¶ protected

_castToExpression(mixed $value, string|null $type = null): mixed

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 convert to ExpressionInterface
string|null $type optional: The type name

Returns

mixed

_requiresToExpressionCasting() ¶ protected

_requiresToExpressionCasting(array $types): array

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

clause() ¶ public

clause(string $clause): Cake\Database\ExpressionInterface|object|scalar|null

Returns the available data for the given clause.

Available clauses

The following clause names are available:

when: The WHEN value.
then: The THEN result value.

Parameters

string $clause: The name of the clause to obtain.

Returns

Cake\Database\ExpressionInterface|object|scalar|null

Throws

InvalidArgumentException
In case the given clause name is invalid.

compileNullableValue() ¶ protected

compileNullableValue(Cake\Database\ValueBinder $binder, Cake\Database\ExpressionInterface|object|scalar|null $value, string|null $type = null): string

Compiles a nullable value to SQL.

Parameters

Cake\Database\ValueBinder $binder: The value binder to use.
Cake\Database\ExpressionInterface|object|scalar|null $value: The value to compile.
string|null $type optional: The value type.

Returns

string

getResultType() ¶ public

getResultType(): string|null

Returns the expression's result value type.

Returns

string|null

inferType() ¶ protected

inferType(mixed $value): string|null

Infers the abstract type for the given value.

Parameters

mixed $value: The value for which to infer the type.

Returns

string|null

sql() ¶ public

sql(Cake\Database\ValueBinder $binder): string

Converts the Node into a SQL string fragment.

Parameters

Cake\Database\ValueBinder $binder

Returns

string

then() ¶ public

then(Cake\Database\ExpressionInterface|object|scalar|null $result, string|null $type = null): $this

Sets the THEN result value.

Parameters

Cake\Database\ExpressionInterface|object|scalar|null $result: The result value.
string|null $type optional: The result type. If no type is provided, the type will be inferred from the given result value.

Returns

$this

traverse() ¶ public

traverse(Closure $callback): $this

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

Parameters

Closure $callback

Returns

$this

when() ¶ public

when(object|array|string|float|int|bool $when, array<string, string>|string|null $type = null): $this

Sets the WHEN value.

Parameters

object|array|string|float|int|bool $when: The WHEN value. When using an array of conditions, it must be compatible with \Cake\Database\Query::where(). Note that this argument is not completely safe for use with user data, as a user supplied array would allow for raw SQL to slip in! If you plan to use user data, either pass a single type for the $type argument (which forces the $when value to be a non-array, and then always binds the data), use a conditions array where the user data is only passed on the value side of the array entries, or custom bindings!
array<string, string>|string|null $type optional: The when value type. Either an associative array when using array style conditions, or else a string. If no type is provided, the type will be tried to be inferred from the value.

Returns

$this

Throws

InvalidArgumentException
In case the `$when` argument is an empty array.
InvalidArgumentException
In case the `$when` argument is an array, and the `$type` argument is neither an array, nor null.
InvalidArgumentException
In case the `$when` argument is a non-array value, and the `$type` argument is neither a string, nor null.

Property Detail

`$_typeMap` ¶ protected

The type map to use when using an array of conditions for the WHEN value.

Type

Cake\Database\TypeMap

`$hasThenBeenDefined` ¶ protected

Whether the THEN value has been defined, eg whether then() has been invoked.

Type

bool

`$then` ¶ protected

The THEN value.

Type

Cake\Database\ExpressionInterface|object|scalar|null

`$thenType` ¶ protected

The THEN result type.

Type

string|null

`$validClauseNames` ¶ protected

The names of the clauses that are valid for use with the clause() method.

Type

list<string>

`$when` ¶ protected

Then WHEN value.

Type

Cake\Database\ExpressionInterface|object|scalar|null

`$whenType` ¶ protected

The WHEN value type.

Type

array|string|null

Namespaces

Class WhenThenExpression

Property Summary

Method Summary

__clone() public

__construct() public

_castToExpression() protected

_requiresToExpressionCasting() protected

clause() public

compileNullableValue() protected

getResultType() public

inferType() protected

sql() public

then() public

traverse() public

when() public

Method Detail

__clone() ¶ public

Returns

__construct() ¶ public

Parameters

_castToExpression() ¶ protected

Parameters

Returns

_requiresToExpressionCasting() ¶ protected

Parameters

Returns

clause() ¶ public

Available clauses

Parameters

Returns

Throws

compileNullableValue() ¶ protected

Parameters

Returns

getResultType() ¶ public

Returns

See Also

inferType() ¶ protected

Parameters

Returns

sql() ¶ public

Parameters

Returns

then() ¶ public

Parameters

Returns

traverse() ¶ public

Parameters

Returns

when() ¶ public

Parameters

Returns

Throws

See Also

Property Detail

$_typeMap ¶ protected

Type

$hasThenBeenDefined ¶ protected

Type

$then ¶ protected

Type

$thenType ¶ protected

Type

$validClauseNames ¶ protected

Type

$when ¶ protected

Type

$whenType ¶ protected

Type

`$_typeMap` ¶ protected

`$hasThenBeenDefined` ¶ protected

`$then` ¶ protected

`$thenType` ¶ protected

`$validClauseNames` ¶ protected

`$when` ¶ protected

`$whenType` ¶ protected