private void AddFilterParameter(FilterCondition filter) {
OpenParentesis();
AppendParameter(filter.Left);
AppendCompareOperator(filter);
AppendParameter(filter.Right);
CloseParentesis();
}
private static CompareOperator ChangeCompareOperatorToIsWhenParameterValueIsNull(FilterCondition filterCondition) {
var parameter = filterCondition.Right as FilterParameter;
if (parameter == null ||
parameter.FilterParameterType != FilterParameterType.Value ||
!parameter.ValueIsNullOrDBNull
) {
return filterCondition.CompareOperator;
}
return CompareOperator.Is;
}