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DateTableDao.java
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DateTableDao.java
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package com.backend;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.Map;
import java.util.Map.Entry;
import java.util.TreeMap;
import java.util.concurrent.locks.ReadWriteLock;
import java.util.concurrent.locks.ReentrantReadWriteLock;
import org.apache.commons.lang.StringUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
public class DateTableDao
{
private static final Logger logger = LoggerFactory
.getLogger(DateTableDao.class);
private Connection conn = SqliteConnManger.getInstance().getConn();
private ReadWriteLock lock = new ReentrantReadWriteLock(false);
private static DateTableDao instance = new DateTableDao();
private DateTableDao()
{
}
public static DateTableDao getInstance()
{
return instance;
}
public TreeMap<String, TreeMap<String, TreeMap<String, DateRecords>>> getAllDateRecord()
{
TreeMap<String, TreeMap<String, TreeMap<String, DateRecords>>> allrecords = new TreeMap<String, TreeMap<String, TreeMap<String, DateRecords>>>();
lock.readLock().lock();
PreparedStatement prep = null;
ResultSet res = null;
try
{
prep = conn.prepareStatement("select * from daterecords;");
res = prep.executeQuery();
while (res.next())
{
String date = res.getString("datestr");
if (StringUtils.isBlank(date) || date.length() != 8)
{
logger.error("one empty datestr record!");
continue;
}
String day = date.substring(6, 8);
String month = date.substring(4, 6);
String year = date.substring(0, 4);
TreeMap<String, TreeMap<String, DateRecords>> myear = allrecords
.get(year);
if (myear == null)
{
myear = new TreeMap<String, TreeMap<String, DateRecords>>();
allrecords.put(year, myear);
}
TreeMap<String, DateRecords> mmonth = myear.get(month);
if (mmonth == null)
{
mmonth = new TreeMap<String, DateRecords>();
myear.put(month, mmonth);
}
DateRecords dr = new DateRecords();
dr.setDatestr(date);
dr.setFirstpic(res.getString("firstpichashstr"));
dr.setPiccount(res.getLong("piccoount"));
mmonth.put(day, dr);
}
prep.close();
res.close();
}
catch (Exception e)
{
logger.error("caught: ", e);
}
finally
{
lock.readLock().unlock();
}
return allrecords;
}
public DateRecords getOneRecordsByDay(String day)
{
if (StringUtils.isBlank(day) || day.length() != 8)
{
return null;
}
lock.readLock().lock();
PreparedStatement prep = null;
ResultSet res = null;
try
{
prep = conn.prepareStatement(
"select * from daterecords where datestr=?;");
prep.setString(1, day);
res = prep.executeQuery();
if (res.next())
{
DateRecords dr = new DateRecords();
dr.setDatestr(day);
dr.setFirstpic(res.getString("firstpichashstr"));
dr.setPiccount(res.getLong("piccoount"));
return dr;
}
prep.close();
res.close();
}
catch (Exception e)
{
logger.warn("caused by: ", e);
}
finally
{
lock.readLock().unlock();
}
return null;
}
public void refreshDate()
{
logger.warn("refresh all date record.");
Map<String, DateRecords> dst = UniqPhotosStore.getInstance()
.genAllDateRecords();
if (dst == null || dst.isEmpty())
{
logger.warn("there is no pic.");
return;
}
lock.writeLock().lock();
PreparedStatement prep = null;
try
{
prep = conn.prepareStatement("delete from daterecords");
prep.execute();
prep.close();
prep = conn
.prepareStatement("insert into daterecords values(?,?,?);");
for (Entry<String, DateRecords> dr : dst.entrySet())
{
prep.setString(1, dr.getKey());
prep.setLong(2, dr.getValue().getPiccount());
prep.setString(3, dr.getValue().getFirstpic());
prep.addBatch();
}
prep.executeBatch();
prep.close();
}
catch (SQLException e)
{
e.printStackTrace();
logger.warn("caught: ", e);
}
finally
{
lock.writeLock().unlock();
}
}
}