derby

I currently use INT as type for primary key in JavaDB (Apache Derby), but since I'm implementing an distributed system I would like to change the type to java.util.UUID . A few questions about this: What datatype in JavaDB/Derby should I use for UUID? I have seen CHAR(16) FOR BIT DATA been mentioned but I don't know much about it. Is VARCHAR(16) an alternative? How should I use it with JDBC? E.g. in an PreparedStatement , how should I set and get an UUID? If I later would likte to change database to SQL Server, is there a compatible datatype to java.util.UUID? Simply, How should I use UUID

I've been having a hard time trying to figure this out. First I have an insertProduct(Product p) method that is supposed to check if a product with the specified code exists in the database. If so, this method will display an error message. Otherwise, it should add the product to the database and print it to the console. I'm not sure if I'm doing that correctly. Second, the deleteProduct(Product p) method is supposed to delete the product that was added by the insertProduct method. Now the thing is that I keep getting a SQL Exception when I try to add the product and then the deleteProduct

I am using apache derby for my database. I am able to perform inserts into the database. The following is the excerpt from the code that attempts to display the contents of my only table 'MAINTAB'. The instance of java.sql.Connection is 'dbconn'. ResultSet word; Statement query; String getData="SELECT THEWORD FROM MAINTAB"; try{ System.out.println(dbconn.getAutoCommit()); query = dbconn.createStatement(); word = query.executeQuery(getData); query.close(); dbconn.setAutoCommit(false); System.out.println(dbconn.getAutoCommit()); for(;word.next();) System.out.println(word.getString(1)); }catch

I'm programming Java application working with Apache Derby and i'm looking for equivalent for "explain" statement (working for mySQL for example). It's not working in Derby. Is there something similar? There are similar things: Firstly, there is derby.language.logQueryPlan=true, which writes query plan information to the log file: http://db.apache.org/derby/docs/10.8/ref/rrefproper43414.html . Secondly, there is the RUNTIMESTATISTICS feature, which can capture the statistics into your program if you want: http://db.apache.org/derby/docs/10.8/ref/rrefsqlj38831.html . Thirdly, there is XPLAIN

I have problem with starting derby server. My derby version: db-derby-10.11.1.1 I followed this tutorial: http://db.apache.org/derby/papers/DerbyTut/ns_intro.html but after typing: startNetworkServer.bat there is no response: https://www.dropbox.com/s/bo1tgfj8gf2533i/derby_issue.PNG?dl=0 Could you help me? Maybe there is some problem with my localhost? I think that i install Derby correctly because after typing: java org.apache.derby.tools.sysinfo I got some result regards DavidJezek The bug is in the localization (for me in cs localization) and the derby server does not print exceptions by

questing is about javaee6 with embedded glassfish and embedded derby jndi lookup for data source at the time of deployment before unit test is executed.... Please find the persistence.xml here... <?xml version="1.0" encoding="UTF-8"?> <persistence xmlns="http://java.sun.com/xml/ns/persistence" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/persistence http://java.sun.com/xml/ns/persistence/persistence_2_0.xsd" version="2.0"> <persistence-unit name="mymodulePU" transaction-type="JTA"> <provider>org.eclipse.persistence.jpa.PersistenceProvider