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POH2DB and Java, an approximate> two hour discrepancy
 

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  1. POH2DB and Java, an approximate> two hour discrepancy
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    <p>I am developing a race timing system, and for several instances, I need to retrieve a time object from H2DB. Like its bretheren (or sisteren), the time data type is relative to 1st January 1970 and is expressed in SQL in the 'hh:mm:ss' format, with the date being by set by default to 01-01-1970. It is by default mapped to the a 'java.sql.Time' object. Being a trusting padawan, I coded the following to separate hours from minutes for display purposes.</p> <pre><code> if(race.getCutOffTime()!=null){ long cutOffHour=(race.getCutOffTime().getTime())/(3600000); int cutOffMinute=(int)(race.getCutOffTime().getTime()%(60*60*1000)); System.out.println(cutOffHour+":"+cutOffMinute); } </code></pre> <p>Java's time handling stink arises however in that these functions output unexpected values, for example, the following statement from my db, gives an output of 3:30.</p> <pre><code>INSERT INTO MagEye.Races(RaceName, EventID,CutOffTime) VALUES ('TEST', SELECT EventID FROM MagEye.Events WHERE EventName='Sabrina Love',TIME '5:50:00'); </code></pre> <p>Changing this statement to reflect a time of '0:0:0', gives me a value of "-2:00" What am I doing wrong? Thank you (in advance).</p> <p><em><strong>Edit</strong></em> As requested, here is my code for the database:</p> <p>Table Creation Statement:</p> <pre><code>CREATE TABLE IF NOT EXISTS MagEye.Races (RaceID INT PRIMARY KEY AUTO_INCREMENT , RaceName VARCHAR(100) ,EventID INT, Description TEXT, MaxEntrants INT, MinAge INT, MaxAge INT, RacePrefix VARCHAR (5), TimingMethod CHAR(1), CutOffTime TIME, RaceEnd TIMESTAMP,Finished BOOLEAN DEFAULT FALSE, Autostart BOOLEAN, FOREIGN KEY(EventID) REFERENCES MagEye.Events(EventID)); </code></pre> <p>Insertion Statement:</p> <pre><code>INSERT INTO MagEye.Races(RaceName, EventID,CutOffTime) VALUES ('TEST', SELECT EventID FROM MagEye.Events WHERE EventName='Sabrina Love',TIME '5:50:00'); </code></pre> <p>Retrieval:</p> <pre><code>raceDB.result = raceDB.state.executeQuery("SELECT * FROM MagEye.Races WHERE EventID=" + eventID + " ORDER BY RaceName"); java.util.ArrayList&lt;Race&gt; races = new java.util.ArrayList&lt;&gt;(); while (raceDB.result.next()) { Race thisRace; String timingMethodString = raceDB.result.getString("TimingMethod"); Race.TimingMethod timingMethod = null; if (timingMethodString != null) { timingMethod = Race.TimingMethod.valueOf(timingMethodString); } else { timingMethod = Race.TimingMethod.MANUAL; } thisRace = new Race(raceDB.result.getInt("RaceID"), event, raceDB.result.getString("RaceName"), raceDB.result.getString("Description"), raceDB.result.getInt("MaxEntrants"), raceDB.result.getInt("MinAge"), raceDB.result.getInt("MaxAge"), raceDB.result.getString("RacePrefix"), timingMethod,(raceDB.result.getTime("CutOffTime")), raceDB.result.getBoolean("Autostart")); thisRace = new Race(raceDB.result.getInt("RaceID"), event, raceDB.result.getString("RaceName"), raceDB.result.getString("Description"), raceDB.result.getInt("MaxEntrants"), raceDB.result.getInt("MinAge"), raceDB.result.getInt("MaxAge"), raceDB.result.getString("RacePrefix"), timingMethod,(raceDB.result.getTime("CutOffTime")), raceDB.result.getBoolean("Autostart")); </code></pre> <p>Display:</p> <pre><code>if(race.getCutOffTime()!=null){ long cutOffHour=(int)(race.getCutOffTime().getTime())/(3600000); RacesCutOffLength.setText(cutOffHour+""); int cutOffMinute=(int)(race.getCutOffTime().getTime()%(60*60*1000)); this.RacesMinutes.setText(cutOffMinute+""); } else{ RacesCutOffLength.setText("0"); RacesMinutes.setText("0"); } </code></pre> <p><em><strong>Edit</strong></em>: I've decided to replace the Time object with a long primative</p>
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    2. VO
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    1. CO"stink"? Good craftsmen do not blame the tools...
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      1. USThorbjørn Ravn Andersen
    2. COThe two hour discrepancy is most likely because you are in a GMT+2 time zone.
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      1. USThorbjørn Ravn Andersen
    3. COWhy is it then, that every mention of Java time in Stack-Overflow has a t least one or more references to Joda time?? :P
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