Examples of org.apache.cayenne.dba.DbAdapter

org.apache.cayenne.dba.DbAdapter
Defines API needed to handle differences between various databases accessed via JDBC. Implementing classed are intended to be pluggable database-specific adapters. DbAdapter-based architecture is introduced to solve the following problems:
- Make Cayenne code independent from SQL syntax differences between different RDBMS.
- Allow for vendor-specific tuning of JDBC access.

    /**
     * Creates new internal DbGenerator instance.
     */
    protected void prepareGenerator() {
        try {
            DbAdapter adapter = connectionInfo.makeAdapter(getApplication()
                    .getClassLoadingService());
            this.generator = new DbGenerator(adapter, dataMap, tables.getExcludedTables());
        }
        catch (Exception ex) {
            reportError("Error loading adapter", ex);

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    public String getAdapterName() {
        if (node == null) {
            return null;
        }


        DbAdapter adapter = node.getAdapter();


        // TODO, Andrus, 11/3/2005 - to simplify this logic, it would be nice to
        // consistently load CustomDbAdapter... this would require an ability to set a
        // load delegate in OpenProjectAction
        if (adapter == null) {
            return null;
        }
        else if (adapter instanceof ModelerDbAdapter) {
            return ((ModelerDbAdapter) adapter).getAdapterClassName();
        }
        // don't do "instanceof" here, as we maybe dealing with a custom subclass...
        else if (adapter.getClass() == AutoAdapter.class) {
            return null;
        }
        else {
            return adapter.getClass().getName();
        }
    }

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    /**
     * Returns iterator of preprocessed table create queries.
     */
    protected Iterator tableCreateQueries(DataNode node, DataMap map) throws Exception {
        DbAdapter adapter = node.getAdapter();
        DbGenerator gen = new DbGenerator(adapter, map, null, getDomain());


        List orderedEnts = dbEntitiesInInsertOrder(node, map);
        List queries = new ArrayList();


        // table definitions
        Iterator it = orderedEnts.iterator();
        while (it.hasNext()) {
            DbEntity ent = (DbEntity) it.next();
            queries.add(adapter.createTable(ent));
        }


        // FK constraints


        it = orderedEnts.iterator();

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            // canceled
            return;
        }


        Connection connection = connectWizard.getConnection();
        DbAdapter adapter = connectWizard.getAdapter();
        DBConnectionInfo dataSourceInfo = connectWizard.getConnectionInfo();


        // from here pass control to DbLoaderHelper, running it from a thread separate
        // from EventDispatch

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        DataDomain domain = dataContext.getParentDataDomain();


        for (DataMap dataMap : domain.getDataMaps()) {
            DataMap map = dataMap;
            DataNode node = domain.lookupDataNode(map);
            DbAdapter adapter = node.getAdapter();
            DbGenerator generator = new DbGenerator(adapter, map);


            try {
                generator.runGenerator(node.getDataSource());
            }

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    /**
     * Returns iterator of preprocessed table create queries.
     */
    private Collection<String> tableCreateQueries(DataNode node, DataMap map)
            throws Exception {
        DbAdapter adapter = node.getAdapter();
        DbGenerator gen = new DbGenerator(adapter, map, null, domain, jdbcEventLogger);


        List<DbEntity> orderedEnts = dbEntitiesInInsertOrder(node, map);
        List<String> queries = new ArrayList<String>();


        // table definitions
        for (DbEntity ent : orderedEnts) {
            queries.add(adapter.createTable(ent));
        }


        // FK constraints
        for (DbEntity ent : orderedEnts) {
            if (!unitDbAdapter.supportsFKConstraints(ent)) {

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                logger.warn("NULL "
                        + jta
                        + " DataSource returned from PersistenceUnitInfo");
            }


            DbAdapter adapter = createCustomAdapter(loader.getContext(), unit);
            DataNode node = new DataNode(name);
            if (adapter == null) {
                adapter = new AutoAdapter(new NodeDataSource(node));
            }

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    /**
     * Handles saving adapter name for CustomDbAdapter that is only used within Modeler.
     */
    public String nodeAdapterName(String domainName, String nodeName) {
        DbAdapter adapter = findNode(domainName, nodeName).getAdapter();
        if (adapter instanceof ModelerDbAdapter) {
            ModelerDbAdapter customAdapter = (ModelerDbAdapter) adapter;
            return customAdapter.getAdapterClassName();
        }

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    protected void buildStatements() {
        dropTables = new HashMap();
        createTables = new HashMap();
        createConstraints = new HashMap();


        DbAdapter adapter = getAdapter();
        Iterator it = dbEntitiesInInsertOrder.iterator();
        while (it.hasNext()) {
            DbEntity dbe = (DbEntity) it.next();


            String name = dbe.getName();


            // build "DROP TABLE"
            dropTables.put(name, adapter.dropTable(dbe));


            // build "CREATE TABLE"
            createTables.put(name, adapter.createTable(dbe));


            // build constraints
            createConstraints.put(name, createConstraintsQueries(dbe));
        }


        PkGenerator pkGenerator = adapter.getPkGenerator();
        dropPK = pkGenerator.dropAutoPkStatements(dbEntitiesRequiringAutoPK);
        createPK = pkGenerator.createAutoPkStatements(dbEntitiesRequiringAutoPK);
    }

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            // TODO: andrus, 2/3/2007 - clarify this logic.... JTA EM may not always mean
            // JTA DS?
            DataSource dataSource = isJTA ? unit.getJtaDataSource() : unit
                    .getNonJtaDataSource();


            DbAdapter adapter = createCustomAdapter(loader.getContext(), unit);
            DataNode node = new DataNode(name);
            if (adapter == null) {
                adapter = new AutoAdapter(new NodeDataSource(node));
            }

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