新增加一个DynamicQuery类，类似于tk.mybatis.mapper中的Example，这样我们可以把一些属性封装到一个类中方便以后扩展。 这里目前封装了筛选，排序和一个distinct。
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public class <T> {
private boolean distinct;
private final Class<T> entityClass;
private final List<FilterDescriptorBase> filters = new ArrayList<>();
private final List<SortDescriptor> sorts = new ArrayList<>();
public (Class<T> entityClass) {
this.entityClass = entityClass;
}
public Class<T> getEntityClass() {
return entityClass;
}
public FilterDescriptorBase[] getFilters() {
return filters.toArray(new FilterDescriptorBase[filters.size()]);
}
public SortDescriptor[] getSorts() {
return sorts.toArray(new SortDescriptor[sorts.size()]);
}
public boolean addFilter(FilterDescriptorBase filter) {
return this.filters.add(filter);
}
public boolean removeFilter(FilterDescriptorBase filter) {
return this.filters.remove(filter);
}
public boolean addSort(SortDescriptor sort) {
return this.sorts.add(sort);
}
public boolean removeSort(SortDescriptor sort) {
return this.sorts.remove(sort);
}
public boolean isDistinct() {
return distinct;
}
public void setDistinct(boolean distinct) {
this.distinct = distinct;
}
}
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