Hibernate Example.setPropertySelector

于 2009-08-24 10:33:03 发布 · 236 阅读

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本文介绍了一个自定义的Hibernate PropertySelector实现——MyPropertySelector，用于在查询过程中排除空值、空白字符串及数值零值的情况。通过具体代码展示了如何创建并应用这个筛选器到Hibernate的查询条件中。

MyPropertySelector


package util;

import org.hibernate.criterion.Example.PropertySelector;
import org.hibernate.type.Type;

@SuppressWarnings("serial")
public class MyPropertySelector {
	private static PropertySelector NOT_NULL_BLANK_ZEROS = null;

	private MyPropertySelector(){
	}

	public static PropertySelector getNotNullBlankZeros() {
		if(NOT_NULL_BLANK_ZEROS == null){
		   NOT_NULL_BLANK_ZEROS = new PropertySelector() {
				public boolean include(Object value, String propertyName, Type type) {
					return value != null
							&& (((value instanceof String) && !("").equals(value)) 
									|| ((value instanceof Number) && ((Number) value).longValue() != 0));			
				}
			};
		}
		return NOT_NULL_BLANK_ZEROS;
	}

}


Criteria c = session.createCriteria(Student.class);
l = c.add(Example.create(s)
                 .setPropertySelector(

	            MyPropertySelector.getNotNullBlankZeros())

                 .enableLike()
).list()