解决方法是情愿多几次访问数据库，增加　Where 条件　缩小检索范围，不要用连接

原代码：

List l = new ArrayList();
StringBuffer sql = new StringBuffer(); sql.append("select log.LOGID,log.LASID,customerinfo.REALNAME,customer.IDTYPE,char(date(log.OPERATEDATE))||' '||char(time(log.OPERATEDATE)),log.OPERATETYPE,");
sql.append("log.OPERATECODE,log.PRINTSTATE,log.FIRSTPRINTDATE,log.LASTPRINTDATE,log.LASTPRINTCODE,");
sql.append("log.EMAILSTATE,log.FIRSTEMAILDATE,log.LASTEMAILDATE,log.LASTEMAILCODE,log.PRINTID,");
sql.append("log.EMAILID,log.FLAG,customer.IDNO,customerinfo.SEX,customer.email,customer.mobile from 日志表　as log,　客户表　as customer, 客户详情表 as customerinfo where log.LASID = char(customer.CUSTOMERID)
and char(customer.CUSTOMERID)= char(customerinfo.CUSTOMERID)");

中　Where  条件　用到了　char()　函数，原来　DB2 中 where 条件中 引用函数会引起全表扫描，逻辑没有什么错，就是线程卡在这里。

修改： 分两部分 先将 顾客ID搜出来，再去搜日志

1.先将 顾客ID搜出来

select customer.CUSTOMERID from 客户表 as customer, 客户详情表 as customerinfo
where customer.CUSTOMERID= customerinfo.CUSTOMERID for read only with ur

2.再去搜日志

StringBuffer sql = new StringBuffer(); sql.append("select log.LOGID,log.LASID,customerinfo.REALNAME,customer.IDTYPE, char(date(log.OPERATEDATE))||' '||char(time(log.OPERATEDATE)),log.OPERATETYPE,");
sql.append("log.OPERATECODE,log.PRINTSTATE,log.FIRSTPRINTDATE,log.LASTPRINTDATE,log.LASTPRINTCODE,");
sql.append("log.EMAILSTATE,log.FIRSTEMAILDATE,log.LASTEMAILDATE,log.LASTEMAILCODE,log.PRINTID,");
sql.append("log.EMAILID,log.FLAG,customer.IDNO,customerinfo.SEX,customer.email,customer.mobile from 日志表 as log, 客户表 as customer,客户详情表 as customerinfo where log.LASID in (");
for(Object CustomerId : CustomerIds){sql.append("'"+CustomerId.toString()+"',");
}
sql.deleteCharAt(sql.lastIndexOf(","));
sql.append(") AND for read only with ur");

记得加上 " for read only with ur "