Hibernate使用中文排序.

Mysql在使用utf-8字符集的时候,不能正确的以中文进行排序.

所以得强制mysql进行中文排序

select * from table ORDER BY CONVERT(column USING gbk);

但是hql并不支持 CONVERT这个语法.所以得改变hibernate的方言(hibernate.dialect)将它设置为我们自定义的dialect.

package com.sangame.ds.ws.util;

import org.hibernate.Hibernate;
import org.hibernate.dialect.MySQLDialect;
import org.hibernate.dialect.function.SQLFunctionTemplate;

/**
 * Created by Administrator on 2017/7/27.
 */
public class MySQLExtendDialect extends MySQLDialect {

    public MySQLExtendDialect(){
        super();
        registerFunction("convert_gbk",
                new SQLFunctionTemplate(Hibernate.STRING, "convert(?1 using gbk)") );
    }

}

需要创建一个类去继承MySQLDialect,在无参构造器中使用registerFunction函数,传入第一个参数,用于指定hql可识别的函数.第二参数用于指定函数的功能,这里就可以指定mysql可以

识别的语句,并将它赋予给自定义的hql函数. 这里convert_gbk = convert(?1 using gbk)了(?1为占位符)

创建好Dialect类后,就要指定hibernate的默认dialect为该类了.   

hibernate.dialect=com.sangame.ds.ws.util.MySQLExtendDialect

这时就可以在hql中使用convert_gbk函数来替代mysql中的CONVERT函数实现中文排序了.

 public Page findPlauLogPage(TerminalPlayLogVo search, int currentPage, int pageSize) {
        StringBuilder hql = new StringBuilder();
        hql.append("select new map(itemName as itemName,terminal.terminalGroup.id as terminalGroupId,terminal.terminalName as terminalName,count(*)as playCount) from TerminalPlayLog  WHERE 1 = 1");
        Long tid = null;
        Long gid = null;
        String itemName = null;
        String terminalName = null;
        Date playBeginTime =null;
        Date playEndTime = null;
        if (search != null) {
            if (search.getTerminal() != null && search.getTerminal().getId() != null) {
                hql.append(" and terminal.id = :tid");
                tid = search.getTerminal().getId();
            }
            if (search.getTerminal() != null && search.getTerminal().getTerminalGroup() != null && search.getTerminal().getTerminalGroup().getId() != null) {
                hql.append(" and terminal.terminalGroup.id = :gid");
                gid = search.getTerminal().getTerminalGroup().getId();
            }
            if (StringUtils.isNotBlank(search.getItemName())) {
                hql.append(" and itemName like :itemName");
                itemName ="%" + search.getItemName() + "%";
            }
            if (search.getTerminal() != null && StringUtils.isNotBlank(search.getTerminal().getTerminalName()) ) {
                hql.append(" and terminal.terminalName like :terminalName");
                terminalName ="%" + search.getTerminal().getTerminalName() + "%";
            }
            if (search.getPlayBeginTime() != null) {
                hql.append(" and playBeginTime >= :playBeginTime");
                playBeginTime = search.getPlayBeginTime();
            }
            if (search.getPlayEndTime() != null) {
                hql.append(" and playEndTime <= :playEndTime");
                playEndTime = search.getPlayEndTime();
            }
        }
        hql.append(" GROUP BY itemName,terminal.terminalName,terminal.terminalGroup.id order by convert_gbk(itemName) ASC");