evaluate
function that allow to evaluate the predicates.
evaluate
function that allow to evaluate the predicates.
evaluate/2 | Evaluates a SQL92 predicate based on a property collection. |
evaluate(Predicate, Properties) -> boolean() | unknown | {error, Message}
Evaluates a SQL92 predicate based on a property collection. The predicate and property collection must follow this BNF grammar specifications.
Example: predicate successfully evaluatedamqp_filter:evaluate("ID IN (123, 456, 789)", [{"ID", 456}]). true amqp_filter:evaluate("USERNAME = 'NICK' AND AGE > 18", [{ "USERNAME", "NICK" }, { "AGE", 25 }]). true amqp_filter:evaluate("YEAR % 4 = 0 AND (NOT YEAR % 100 = 0 OR YEAR % 400 = 0)", [{ "YEAR", 2018 }]). falseExample: non-existent user property (more details)
amqp_filter:evaluate("USERNAME = 'NICK'", []). unknownExample: lexer or parser error
amqp_filter:evaluate("2 @ (1, 2, 3)", []). {error,{1,expression_lexer,{illegal,"@"}},1} amqp_filter:evaluate("2 IN (1,)", []). {error,{1,expression_parser, ["syntax error before: ",["\")\""]]}}
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