updateRule

updateRule(engineName, key, rules)

engineName is a STRING scalar indicating the engine name.

key is a scalar of STRING or INT type that specifies the key of rule set to be updated.

rules is a tuple of metacode indicating the rules to be updated.

If the specified key already exists in the rule engine, update the corresponding value with rules;

If the key does not exist in the rule engine, add the rules.

Return value: true if successful, otherwise false.

// create a rule engine
x = [1, 2, NULL]
y = [ [ < value>1 > ], [ < price<2 >, < price>6 > ], [ < value*price>10 > ] ]
ruleSets = dict(x, y)
names = `sym`value`price`quatity
types = [INT, DOUBLE, DOUBLE, DOUBLE]
dummy = table(10:0, names, types)
outputNames = `sym`value`price`rule
outputTypes = [INT, DOUBLE, DOUBLE, BOOL[]]
outputTable = table(10:0, outputNames, outputTypes)
test = createRuleEngine("ruleEngineTest",ruleSets,dummy ,`sym`value`price, outputTable,  "all",`sym)

test.append!(table(1 as sym, 0 as value, 2 as price, 3 as quatity))
test.append!(table(3 as sym, 6 as value, 1 as price, 3 as quatity))
// outputTable
1	0	2	[false]
3	6	1	[false]

// modify the rule for sym=1 to value >=0
updateRule("ruleEngineTest", 1, [ <value >= 0>])
test.append!(table(1 as sym, 0 as value, 2 as price, 3 as quatity))
// outputTable
1	0	2	[true]

// add the rule value > 5 for sym=3  
updateRule("ruleEngineTest",3,[<value>5>])
test.append!(table(3 as sym, 6 as value, 1 as price, 3 as quatity))
// outputTable
3	6	1	[true]