public Page<Record> getLogPages(String meter_id, Integer emi, Integer lack, Integer low, Integer close,
String stat, Integer page, Integer limit) throws Exception {
String tbName = "data_civils_";
if(StringUtils.isNotEmpty(stat))
tbName += stat.replace("-", "").substring(0,6);
else
tbName += DateFormatUtils.format(new Date(), "yyyyMM");
String tb = Db.queryStr("select table_name from information_schema.TABLES WHERE table_name = ?", tbName);
if(StringUtils.isEmpty(tb))
return null;
else{
String filter = getFilter(emi, lack, low, close, null, null);
if(StringUtils.isNotEmpty(meter_id))
filter += " and t.device_id = '" + meter_id + "'";
if(StringUtils.isNotEmpty(stat))
filter += " and t.stat_date = '" + stat + "'";
String sql = "select count(1) from " + tbName + " t where 1=1";
Long count = Db.queryLong(sql + filter);
sql = "select t.stat_date, t.reading, t.voltage, t.surplus, t.balance, t.nouse, t.nosub, t.is_emi, t.is_lack, t.is_low, t.is_close, t.update_time,"
+ " case when t.is_emi = 1 then 'red' else 'green' end color1, case when t.is_lack = 1 then 'red' else 'green' end color2,"
+ " case when t.is_low = 1 then 'red' else 'green' end color3, case when t.is_close = 1 then 'red' else 'green' end color4"
+ " from " + tbName + " t where 1=1" + filter + " order by t.stat_date desc limit ?,?";
return new Page<Record>(page, limit, count, Db.find(sql, (page - 1) * limit, limit));
}
}
第二段代码：
public Page<Record> getLogPages(Integer id, String stat, Integer page, Integer limit) throws Exception{
String tbName = "data_cards_";
if(StringUtils.isNotEmpty(stat))
tbName += stat.replace("-", "").substring(0,6);
else
tbName += DateFormatUtils.format(new Date(), "yyyyMM");
String tb = Db.queryStr("select table_name from information_schema.TABLES where table_name = ?", tbName);
if(StringUtils.isEmpty(tb))
return null;
else{
String filter = "";
if(StringUtils.isNotBlank(stat))
filter += " and stat_date = '" + stat.trim() + "'";
if(id != null)
filter += " and device_id = " + id;
String sql = "select count(1) from tank." + tbName + " where 1=1";
Long count = Db.queryLong(sql + filter);
sql = "select * from tank." + tbName + " where 1=1 " + filter + " order by update_time desc limit ?,?";
return new Page<Record>(page, limit, count, Db.find(sql, (page - 1) * limit, limit));
}
}跟踪了一下发现第一段代码 return null 返回的是null，而第二段代码return null 返回的是一个page对象，这是什么原因？
