Examples of org.apache.torque.adapter.Adapter

org.apache.torque.adapter.Adapter
DB defines the interface for a Torque database adapter. Support for new databases is added by implementing this interface. A couple of default settings is provided by subclassing AbstractDBAdapter. The new database adapter and its corresponding JDBC driver need to be registered in the service configuration file.
The Torque database adapters exist to present a uniform interface to database access across all available databases. Once the necessary adapters have been written and configured, transparent swapping of databases is theoretically supported with zero code changes and minimal configuration file modifications. All database adapters need to be thread safe, as they are instantiated only once fore a given configured database and may be accessed simultaneously from several threads. * @author Jon S. Stevens @author Brett McLaughlin @author Daniel Rall @author Augustin Vidovic @author Thomas Vandahl @author Greg Monroe @version $Id: Adapter.java 1450486 2013-02-26 22:18:00Z tfischer $

        // This is known not to work for mysql
        author = new Author();
        author.setName("author");
        author.save();


        Adapter adapter = Torque.getAdapter(Torque.getDefaultDB());
        if (adapter instanceof MysqlAdapter
                || adapter instanceof MssqlAdapter)
        {
            log.error("testIgnoreCase(): "
                    + "Case sensitive comparisons are known not to work"

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     * @return the version String mysql returns
     * @throws TorqueException if the database is not mysql or the query fails.
     */
    protected String getMysqlVersion() throws TorqueException
    {
        Adapter adapter
                = Torque.getDatabase(Torque.getDefaultDB()).getAdapter();
        if (!(adapter instanceof MysqlAdapter))
        {
            throw new TorqueException(
                    "getMysqlVersion called but database adapter is "
                        + adapter.getClass().getName());
        }
        List<String> records = BasePeer.doSelect(
                "show variables like \"version\"",
                new StringMapper(1),
                (String) null);

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    /**
     * Criteria Howto, section "subselects"
     */
    public void testSubselects() throws TorqueException
    {
        Adapter adapter
                = Torque.getDatabase(Torque.getDefaultDB()).getAdapter();
        if (adapter instanceof MysqlAdapter)
        {
            int majorVersion = getMysqlMajorVersion();
            int minorVersion = getMysqlMinorVersion();

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                {
                    String adapterKey = c.getString(key);
                    String handle = key.substring(0, key.indexOf('.'));


                    Database database = getOrCreateDatabase(handle);
                    Adapter adapter = null;


                    if (StringUtils.equals(
                            Adapter.AUTODETECT_ADAPTER,
                            adapterKey))
                    {

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            final Query query)
            throws TorqueException
    {
        if (criteria.isForUpdate())
        {
            Adapter adapter = Torque.getAdapter(criteria.getDbName());
            query.setForUpdate(adapter.getUpdateLockClause());
        }
    }

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     *
     * @throws Exception if an error occurs.
     */
    public void testTransactionDeadlock() throws Exception
    {
        Adapter adapter
            = Torque.getDatabase(Torque.getDefaultDB()).getAdapter();
        if (adapter instanceof HsqldbAdapter)
        {
            log.warn("hsqldb (2.2.6) fails to detect the deadlock in this test"
                    + " therefore this test is skipped");

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                CriteriaInterface<?> criteria)
            throws TorqueException
    {
        final String dbName = criteria.getDbName();
        final Database database = Torque.getDatabase(dbName);
        final Adapter adapter = Torque.getAdapter(dbName);


        boolean ignoreCase
                = isIgnoreCase(criterion, criteria, database);


        WhereClauseExpression whereClausePartInput

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            query);


        boolean ignoreCase
                = criteria.isIgnoreCase() || criterion.isIgnoreCase();
        final String dbName = criteria.getDbName();
        final Adapter adapter = Torque.getAdapter(dbName);
        final Database database = Torque.getDatabase(dbName);
        {
            Column databaseColumn = resolveAliasAndAsColumnAndSchema(
                    column,
                    criteria);

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                    || (columnMap.getType() instanceof String
                        && sqlExpression.indexOf('(') == -1))
            {
                if (orderBy.isIgnoreCase() || crit.isIgnoreCase())
                {
                    final Adapter adapter = Torque.getAdapter(crit.getDbName());
                    orderByClause.add(
                            adapter.ignoreCaseInOrderBy(sqlExpression)
                                + ' ' + orderBy.getOrder());
                    selectClause.add(
                            adapter.ignoreCaseInOrderBy(sqlExpression));
                }
                else
                {
                    orderByClause.add(sqlExpression + ' ' + orderBy.getOrder());
                    if (crit.getAsColumns().get(sqlExpression) == null)

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        int limit = crit.getLimit();
        long offset = crit.getOffset();


        if (offset > 0 || limit >= 0)
        {
            Adapter adapter = Torque.getAdapter(crit.getDbName());
            adapter.generateLimits(query, offset, limit);
        }
    }

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