Examples of org.exolab.castor.jdo.Database.begin()

org.exolab.castor.jdo.Database.begin()
Begin a new transaction. A transaction must be open in order to query and persist objects. @throws PersistenceException A transaction is already open onthis database, or an error reported by the persistence engine

    OQLQuery      computerOql;
    QueryResults  results;


    db = _jdo.getDatabase();


    db.begin();
    writer.println( "Begin transaction" );


    // Look up the product and if found in the database,
    // delete this object from the database
    productOql = db.getOQLQuery( "SELECT p FROM myapp.Product p WHERE id = $1" );

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    // Checkpoint commits all the updates to the database
    // but leaves the transaction (and locks) open
    writer.println( "Transaction checkpoint" );
    db.commit();


    db.begin();
    // If no such group exists in the database, create a new
    // object and persist it
    groupOql.bind( 3 );
    results = groupOql.execute();
    if ( ! results.hasMore() ) {

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    Marshaller     marshaller;


    marshaller = new Marshaller( writer );
    marshaller.setMapping( _mapping );


    db.begin();
    marshaller.marshal( db.load( Product.class, new Integer( 4 ) ) );
    computerOql = db.getOQLQuery( "SELECT c FROM myapp.Computer c" );
    results = computerOql.execute();
    while( results.hasMore() )
      marshaller.marshal( results.next() );

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    public void testReadWriteEmpty() throws Exception {
        long start = System.currentTimeMillis();
        
        Database db = _jdo.getDatabase();
        db.getCacheManager().expireCache();
        db.begin();
        
        long begin = System.currentTimeMillis();
        
        OQLQuery query = db.getOQLQuery(
                "SELECT o FROM " + Service.class.getName() + " o order by o.id");

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    public void testReadWriteCached() throws Exception {
        long start = System.currentTimeMillis();
        
        Database db = _jdo.getDatabase();
        db.begin();
        
        long begin = System.currentTimeMillis();
        
        OQLQuery query = db.getOQLQuery(
                "SELECT o FROM " + Service.class.getName() + " o order by o.id");

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    public void testReadOnlyEmpty() throws Exception {
        long start = System.currentTimeMillis();
        
        Database db = _jdo.getDatabase();
        db.getCacheManager().expireCache();
        db.begin();
        
        long begin = System.currentTimeMillis();
        
        OQLQuery query = db.getOQLQuery(
                "SELECT o FROM " + Service.class.getName() + " o order by o.id");

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    public void testReadOnlyCached() throws Exception {
        long start = System.currentTimeMillis();
        
        Database db = _jdo.getDatabase();
        db.begin();
        
        long begin = System.currentTimeMillis();
        
        OQLQuery query = db.getOQLQuery(
                "SELECT o FROM " + Service.class.getName() + " o order by o.id");

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    public void testReadWriteOidEmpty() throws Exception {
        long start = System.currentTimeMillis();
        
        Database db = _jdo.getDatabase();
        db.getCacheManager().expireCache();
        db.begin();
        
        long begin = System.currentTimeMillis();
        
        OQLQuery query = db.getOQLQuery(
                "CALL SQL select PTF_SERVICE.ID as ID "

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    public void testReadWriteOidCached() throws Exception {
        long start = System.currentTimeMillis();
        
        Database db = _jdo.getDatabase();
        db.begin();
        
        long begin = System.currentTimeMillis();
        
        OQLQuery query = db.getOQLQuery(
                "CALL SQL select PTF_SERVICE.ID as ID "

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    public void testReadOnlyOidEmpty() throws Exception {
        long start = System.currentTimeMillis();
        
        Database db = _jdo.getDatabase();
        db.getCacheManager().expireCache();
        db.begin();
        
        long begin = System.currentTimeMillis();
        
        OQLQuery query = db.getOQLQuery(
                "CALL SQL select PTF_SERVICE.ID as ID "

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