ibatis in sql statement to determine when and isNull isEqual

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isNull null field is determined whether property, a more convenient isEmpty, comprising a null and an empty string
if you use

a.id = # id #

even if you are not in the set value of the bean id, the id is the initial value 0 instead of null ; so this configuration will a.id equal to 0
and you name variables like configuration with isNotNull, name if no value is set, the initial is null, name of the condition not to add the sql;
isEqual equivalent of equals, with a much more digital It is generally determined state value


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