Class CaseExpression
This class represents a SQL Case statement
Property Summary
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$_conditions protected
arrayA list of strings or other expression objects that represent the conditions of the case statement. For example one key of the array might look like "sum > :value"
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$_elseValue protected
stringCake\Database\ExpressionInterface|array|nullThe
ELSEvalue for the case statement. If null then noELSEwill be included. -
$_values protected
arrayValues that are associated with the conditions in the $_conditions array. Each value represents the 'true' value for the condition with the corresponding key.
Method Summary
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__construct() public
Constructs the case expression
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_addExpressions() protected
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'.
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_castToExpression() protected
Conditionally converts the passed value to an ExpressionInterface object if the type class implements the ExpressionTypeInterface. Otherwise, returns the value unmodified.
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_compile() protected
Compiles the relevant parts into sql
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_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.
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add() public
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.
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elseValue() public
Sets the default value
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sql() public
Converts the Node into a SQL string fragment.
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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(arrayCake\Database\ExpressionInterface $conditions = [], arrayCake\Database\ExpressionInterface $values = [], array $types = [])Constructs the case expression
Parameters
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arrayCake\Database\ExpressionInterface$conditions optional The conditions to test. Must be a ExpressionInterface instance, or an array of ExpressionInterface instances.
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arrayCake\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 $value is used as the
ELSEvalue-
array$types optional associative array of types to be associated with the values passed in $values
_addExpressions() ¶ protected
_addExpressions(arrayCake\Database\ExpressionInterface $conditions, arrayCake\Database\ExpressionInterface $values, array $types): voidIterates over the passed in conditions and ensures that there is a matching true value for each. If no matching true value, then it is defaulted to '1'.
Parameters
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arrayCake\Database\ExpressionInterface$conditions Must be a ExpressionInterface instance, or an array of ExpressionInterface instances.
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arrayCake\Database\ExpressionInterface$values associative array of values of each condition
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array$types associative array of types to be associated with the values
Returns
void_castToExpression() ¶ protected
_castToExpression(mixed $value, string $type): mixedConditionally converts the passed value to an ExpressionInterface object if the type class implements the ExpressionTypeInterface. Otherwise, returns the value unmodified.
Parameters
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mixed$value The value to converto to ExpressionInterface
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string$type The type name
Returns
mixed_compile() ¶ protected
_compile(array|stringCake\Database\ExpressionInterface $part, Cake\Database\ValueBinder $generator): stringCompiles the relevant parts into sql
Parameters
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array|stringCake\Database\ExpressionInterface$part The part to compile
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Cake\Database\ValueBinder$generator Sql generator
Returns
string_requiresToExpressionCasting() ¶ protected
_requiresToExpressionCasting(array $types): arrayReturns an array with the types that require values to be casted to expressions, out of the list of type names passed as parameter.
Parameters
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array$types List of type names
Returns
arrayadd() ¶ public
add(arrayCake\Database\ExpressionInterface $conditions = [], arrayCake\Database\ExpressionInterface $values = [], array $types = []): $thisAdds one or more conditions and their respective true values to the case object. Conditions must be a one dimensional array or a QueryExpression. The trueValues must be a similar structure, but may contain a string value.
Parameters
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arrayCake\Database\ExpressionInterface$conditions optional Must be a ExpressionInterface instance, or an array of ExpressionInterface instances.
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arrayCake\Database\ExpressionInterface$values optional associative array of values of each condition
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array$types optional associative array of types to be associated with the values
Returns
$thiselseValue() ¶ public
elseValue(Cake\Database\ExpressionInterface|string|array|null $value = null, string|null $type = null): voidSets the default value
Parameters
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Cake\Database\ExpressionInterface|string|array|null$value optional Value to set
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string|null$type optional Type of value
Returns
voidsql() ¶ public
sql(Cake\Database\ValueBinder $generator): stringConverts the Node into a SQL string fragment.
Parameters
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Cake\Database\ValueBinder$generator Placeholder generator object
Returns
stringtraverse() ¶ public
traverse(callable $visitor): voidIterates over each part of the expression recursively for every level of the expressions tree and executes the $visitor callable passing as first parameter the instance of the expression currently being iterated.
Parameters
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callable$visitor
Returns
voidProperty 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
stringCake\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