hibernate實現NULLS LAST

關於 hibernate 查詢中實現order by的 NULLS LAST 和 NULLS FIRST

　1:創建一個CustomNullsFirstInterceptor類
　

package com.jnpm.util;

import org.apache.tools.ant.util.StringUtils;
import org.hibernate.EmptyInterceptor;

import com.sun.org.apache.commons.logging.Log;
import com.sun.org.apache.commons.logging.LogFactory;

public class MyNullsFirstInterceptor extends EmptyInterceptor {

    private static final long serialVersionUID = 1L;

        private final Log logger = LogFactory.getLog(getClass());  

        private static final String ORDER_BY_TOKEN = "order by";

        public String onPrepareStatement(String sql) {  
            int orderByStart = sql.toLowerCase().indexOf(ORDER_BY_TOKEN);  
            boolean isNeedFixNullFirst = orderByStart > -1;  
            if (!isNeedFixNullFirst) {  
                return super.onPrepareStatement(sql);  
            }  

            sql = StringUtils.replace(sql, " DESC ", " DESC NULLS LAST ");  
            sql = StringUtils.replace(sql, " DESC)", " DESC NULLS LAST)");  
            sql = StringUtils.replace(sql, " ASC ", " ASC NULLS LAST ");  
            sql = StringUtils.replace(sql, " ASC)", " ASC NULLS LAST)");

            logger.debug(sql);  
            return super.onPrepareStatement(sql);
        }

}

2：加入配置
applicationContext.xml

    <bean id="sessionFactory"
        class="org.springframework.orm.hibernate3.LocalSessionFactoryBean">
        <property name="configLocations">
            <list>
            <value>classpath:*.cfg.xml</value>
            </list>
        </property>
        <property name="entityInterceptor">
            <bean id="myNullsFirstInterceptor"   　　　　　　　　　　　class="com.jnpm.util.MyNullsFirstInterceptor" />
    　　</property>
    </bean>

原文：http://czpae86.iteye.com/blog/1574915