Description Usage Arguments Value Examples
View source: R/buildCondition.R
Returns a condition clause to be used in queries.
1 | buildCondition(variable, operator, value)
|
variable |
The variable or column name to filter. |
operator |
An operator for the filter. Currenty (== equals) an (!= not equals) are supported. (More operators to be implemented in the future). |
value |
Provides a value to compare with. |
Returns the filtering clause. A list of clauses can be composed
and passed to query()
or count()
functions via the conditions
parameter to build complex queries.
1 2 3 4 5 6 7 | cnx <- connect('http://www.traitbase.info')
off <- resource(cnx, 'species')
count(off)
count(off, conditions=buildCondition('species', '!=', 'Bombus') )
count(off, conditions=buildCondition('species', '==', 'Bombus') )
query(off, conditions=buildCondition('species', '==', 'Bombus') )
|
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