class Sequel::SQL::ComplexExpression
Constants
- ASSOCIATIVE_OPERATORS
Operator symbols that are associative
- BITWISE_OPERATORS
Bitwise mathematical operators used in
BitwiseMethods
- BOOLEAN_OPERATOR_METHODS
Hash of ruby operator symbols to SQL operators, used in
BooleanMethods
- CONSTANT_INVERSIONS
A hash of the opposite for each constant, used for inverting constants.
- CUSTOM_EXPRESSIONS
Custom expressions that may have different syntax on different databases
- EQUALITY_OPERATORS
Operators that check for equality
- INEQUALITY_OPERATORS
Inequality operators used in
InequalityMethods
- IN_OPERATORS
Operators that use IN/NOT IN for inclusion/exclusion
- IS_OPERATORS
Operators that use IS, used for special casing to override literal true/false values
- LIKE_OPERATORS
Operators that do pattern matching via LIKE
- MATHEMATICAL_OPERATORS
Standard mathematical operators used in
NumericMethods
- N_ARITY_OPERATORS
Operator symbols that take one or more arguments
- ONE_ARITY_OPERATORS
Operator symbols that take only a single argument
- OPERTATOR_INVERSIONS
A hash of the opposite for each operator symbol, used for inverting objects.
- REGEXP_OPERATORS
Operators that do pattern matching via regular expressions
- TWO_ARITY_OPERATORS
Operator symbols that take exactly two arguments
Attributes
An array of args for this object
The operator symbol for this object
Public Class Methods
Set the operator symbol and arguments for this object to the ones given.
Convert all args that are hashes or arrays of two element arrays to
BooleanExpressions
, other than the second arg for an IN/NOT IN
operator. Raise an Error
if the operator doesn't allow
boolean input and a boolean argument is given. Raise an Error
if the wrong number of arguments for a given operator is used.
# File lib/sequel/sql.rb, line 234 def initialize(op, *args) orig_args = args args = args.map{|a| Sequel.condition_specifier?(a) ? SQL::BooleanExpression.from_value_pairs(a) : a} case op when *N_ARITY_OPERATORS raise(Error, "The #{op} operator requires at least 1 argument") unless args.length >= 1 args.map!{|a| a.is_a?(self.class) && a.op == :NOOP ? a.args.first : a} if ASSOCIATIVE_OPERATORS.include?(op) old_args = args args = [] old_args.each{|a| a.is_a?(self.class) && a.op == op ? args.concat(a.args) : args.push(a)} end when *TWO_ARITY_OPERATORS raise(Error, "The #{op} operator requires precisely 2 arguments") unless args.length == 2 # With IN/NOT IN, even if the second argument is an array of two element arrays, # don't convert it into a boolean expression, since it's definitely being used # as a value list. args[1] = orig_args[1] if IN_OPERATORS.include?(op) when *ONE_ARITY_OPERATORS raise(Error, "The #{op} operator requires a single argument") unless args.length == 1 when *CUSTOM_EXPRESSIONS # nothing else raise(Error, "Invalid operator #{op}") end @op = op @args = args.freeze freeze end
Public Instance Methods
Return a BooleanExpression with the same op and args.
# File lib/sequel/sql.rb, line 1264 def sql_boolean BooleanExpression.new(self.op, *self.args) end
Return a NumericExpression with the same op and args.
# File lib/sequel/sql.rb, line 1269 def sql_number NumericExpression.new(self.op, *self.args) end
Return a StringExpression with the same op and args.
# File lib/sequel/sql.rb, line 1274 def sql_string StringExpression.new(self.op, *self.args) end
Private Instance Methods
ComplexExpression's initializer uses a splat for the operator arguments.
# File lib/sequel/extensions/eval_inspect.rb, line 102 def inspect_args [:op, "*args"] end