hsqldb

I am creating a spring based web application that uses embedded hsqldb. My spring config is pretty simple: <jdbc:embedded-database id="dataSource" type="HSQL" > <jdbc:script location="classpath:scripts/create-table-if-not-exists" /> </jdbc:embedded-database> But with this config all data is stored in memory. Here is the data source url that is created jdbc:hsqldb:mem:dataSource I need to persist data to a file. So that I can use it again after server restart. This solution worked for me <bean class="org.apache.commons.dbcp2.BasicDataSource" id="dataSource"> <property name="driverClassName"

I have the following definition for an id field in an entity that is mapped to a table in HSQLDB. ... @Id @GeneratedValue(strategy=GenerationType.AUTO) @Column(name = "ID") private Integer id; ... But this does not seem to generate the an unique id; instead an attempt is made to insert null into the column which results in failure. If, I manually create a sequence and generation strategy to use that sequence then the data is persisted as expected. Doesn't a generation strategy of auto imply that the provider (hibernate in this case) will automatically choose the correct approach and do all the

Oracle: select systimestamp from dual MySQL: select current_timestamp SQL Server: select current_timestamp PostgreSQL: select current_timestamp The question is, how can I get the current timestamp in HSQLDB ? I use version 1.8.0.10 You can write select current_timestamp from tablename where tablename is a real table in your database. The result of the query is only the current timestamp. In a select I use SELECT CURRENT_DATE AS today, CURRENT_TIME AS now FROM (VALUES(0)) pilcrow @alexdown's answer is quite right -- under 1.8 you need a one-row relation to do this, like Oracle's DUAL or the

Recently i heard about the concept of In memory database. In any type of database we are finally storing the data in the computer,from there our program will get the data .How in memory database operations are fast when compared to the others. Will the in memory database load all the data from the database into memory(RAM). Thanks in advance.... An in-memory database (IMDB; also main memory database system or MMDB or memory resident database) is a database management system that primarily relies on main memory for computer data storage. It is contrasted with database management systems that

What are the main differences between SQLite and HSQLDB ? There are lots of applications using both of them, but I don't really see any major difference. SQLite is implemented in C, HSQL is implemented in Java. It should be more seamless and easy to integrate SQLite with an application project written in C or C++, whereas I would expect the HSQL technology is easier to integrate with a project written in Java. No doubt there are numerous other more subtle differences between these two embedded databases, but the above is the most prominent difference. The good comparison of HSQLDB & SQLite can

Something of an novice with HSQL and Hibernate... em.getTransaction().begin(); for (Activity theActivity : activities) { em.persist(theActivity); } em.getTransaction().commit(); em.close(); followed by... EntityManager em = emf.createEntityManager(); em.getTransaction().begin(); System.out.println("QUERY:: " + em.createQuery("SELECT COUNT(*) FROM " + Activity.class.getName()).getSingleResult() .toString()); em.getTransaction().commit(); Prints 25000 (the number of Activity objects in activities). But when I run this test again, the number of objects in the count(*) doesn't increase (and is 0