| gvSIG desktop 1

/* gvSIG. Geographic Information System of the Valencian Government

*

* Copyright (C) 2007-2008 Infrastructures and Transports Department

* of the Valencian Government (CIT)

*

* This program is free software; you can redistribute it and/or

* modify it under the terms of the GNU General Public License

* as published by the Free Software Foundation; either version 2

* of the License, or (at your option) any later version.

*

* This program is distributed in the hope that it will be useful,

* but WITHOUT ANY WARRANTY; without even the implied warranty of

* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

* GNU General Public License for more details.

*

* You should have received a copy of the GNU General Public License

* along with this program; if not, write to the Free Software

* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,

* MA  02110-1301, USA.

*

*/

/*

* AUTHORS (In addition to CIT):

* 2009 IVER T.I   {{Task}}

*/

/**

 *

 */

package org.gvsig.fmap.dal.store.jdbc;

import java.security.InvalidParameterException;

import java.sql.Connection;

import java.sql.PreparedStatement;

import java.sql.ResultSet;

import java.sql.SQLException;

import java.sql.Statement;

import java.util.ArrayList;

import java.util.Iterator;

import java.util.List;

import org.cresques.cts.IProjection;

import org.gvsig.fmap.dal.DALLocator;

import org.gvsig.fmap.dal.DataManager;

import org.gvsig.fmap.dal.DataServerExplorer;

import org.gvsig.fmap.dal.DataStoreNotification;

import org.gvsig.fmap.dal.DataTypes;

import org.gvsig.fmap.dal.exception.CloseException;

import org.gvsig.fmap.dal.exception.DataException;

import org.gvsig.fmap.dal.exception.InitializeException;

import org.gvsig.fmap.dal.exception.OpenException;

import org.gvsig.fmap.dal.exception.ReadException;

import org.gvsig.fmap.dal.exception.ValidateDataParametersException;

import org.gvsig.fmap.dal.feature.EditableFeatureType;

import org.gvsig.fmap.dal.feature.FeatureAttributeDescriptor;

import org.gvsig.fmap.dal.feature.FeatureQuery;

import org.gvsig.fmap.dal.feature.FeatureStore;

import org.gvsig.fmap.dal.feature.FeatureType;

import org.gvsig.fmap.dal.feature.spi.AbstractFeatureStoreProvider;

import org.gvsig.fmap.dal.feature.spi.FeatureProvider;

import org.gvsig.fmap.dal.feature.spi.FeatureReferenceProviderServices;

import org.gvsig.fmap.dal.feature.spi.FeatureSetProvider;

import org.gvsig.fmap.dal.resource.Resource;

import org.gvsig.fmap.dal.resource.exception.ResourceBeginException;

import org.gvsig.fmap.dal.resource.spi.ResourceProvider;

import org.gvsig.fmap.dal.spi.DataStoreProviderServices;

import org.gvsig.fmap.dal.store.jdbc.exception.InvalidResultSetIdException;

import org.gvsig.fmap.dal.store.jdbc.exception.JDBCException;

import org.gvsig.fmap.dal.store.jdbc.exception.JDBCExecuteSQLException;

import org.gvsig.fmap.dal.store.jdbc.exception.JDBCSQLException;

import org.gvsig.fmap.geom.Geometry;

import org.gvsig.fmap.geom.operation.towkb.ToWKB;

import org.gvsig.fmap.geom.primitive.Envelope;

import org.gvsig.tools.ToolsLocator;

import org.gvsig.tools.dynobject.DynClass;

import org.gvsig.tools.dynobject.DynObject;

import org.gvsig.tools.dynobject.DynObjectManager;

import org.gvsig.tools.exception.BaseException;

import org.slf4j.Logger;

import org.slf4j.LoggerFactory;

/**

 * @author jmvivo

 *

 */

public class JDBCStoreProvider extends AbstractFeatureStoreProvider

                implements JDBCHelperUser {

        final static private Logger logger = LoggerFactory

                        .getLogger(JDBCStoreProvider.class);

        private List resulsetList;

        public static String NAME = "JDBC";

        private static final String DYNCLASS_NAME = "JDBCStore";

        public static String DESCRIPTION = "JDBC source";

        private static DynClass DYNCLASS = null;

        private long mlsecondsToZombie = 1000 * 60 * 10; // 10 Min

        protected JDBCHelper helper;

        protected boolean directSQLMode;

        private Long totalCount = null;

        public JDBCStoreProvider(JDBCStoreParameters params,

                        DataStoreProviderServices storeServices) throws InitializeException {

                this(params, storeServices, ToolsLocator.getDynObjectManager()

                                .createDynObject(DYNCLASS));

        }

        protected JDBCStoreProvider(JDBCStoreParameters params,

                        DataStoreProviderServices storeServices, DynObject metadata)

                        throws InitializeException {

                super(params, storeServices, metadata);

                resulsetList = new ArrayList(10);

                helper = createHelper();

                if (params.getSQL() != null && (params.getSQL()).trim().length() > 0) {

                        directSQLMode = true;

                }

                this.setDynValue("DefaultSRS", null);

                this.setDynValue("Envelope", null);

                this.initFeatureType();

        }

        protected JDBCStoreParameters getJDBCParameters() {

                return (JDBCStoreParameters) this.getParameters();

        }

        protected static void registerDynClass() {

                DynObjectManager dynman = ToolsLocator.getDynObjectManager();

                DynClass dynClass;

                if (DYNCLASS == null) {

                        dynClass = dynman.add(DYNCLASS_NAME, DESCRIPTION);

                        dynClass.extend(dynman.get(FeatureStore.DYNCLASS_NAME));

                        DYNCLASS = dynClass;

                }

        }

        /**

         * Load data form a resulset.<br>

         *

         * <strong>Note:</strong><br>

         * this method have to perform <code>resouceBegin</code> at the begining and

         * <code>resourceEnd</code> at the end of execution.

         *

         *

         * @param data

         * @param resulsetID

         *

         * @return

         * @throws DataException

         */

        public void loadFeatureProvider(FeatureProvider data, int resultsetID)

                        throws DataException {

                this.resourceBegin();

                try {

                        ResultSet rs = getResultSet(resultsetID);

                        FeatureAttributeDescriptor attr;

                        Iterator iter = data.getType().iterator();

                        while (iter.hasNext()) {

                                attr = (FeatureAttributeDescriptor) iter.next();

                                loadFeatureProviderValue(data, rs, attr);

                        }

                } finally {

                        this.resourceEnd();

                }

        }

        protected void loadFeatureProviderValue(FeatureProvider data, ResultSet rs,

                        FeatureAttributeDescriptor attr) throws DataException {

                if (attr.getDataType() == DataTypes.GEOMETRY) {

                        byte[] buffer;

                        try {

                                buffer = rs.getBytes(attr.getIndex() + 1);

                                if (buffer == null) {

                                        data.set(attr.getIndex(), null);

                                } else {

                                        data.set(attr.getIndex(), this.helper.getGeometry(buffer));

                                }

                        } catch (SQLException e) {

                                throw new JDBCSQLException(e);

                        } catch (BaseException e) {

                                throw new ReadException(getName(), e);

                        }

                } else {

                        try {

                                data.set(attr.getIndex(), rs.getObject(attr.getIndex() + 1));

                        } catch (SQLException e) {

                                throw new JDBCSQLException(e);

                        }

                }

        }

        public long getTimeToResulSetZombie() {

                return mlsecondsToZombie;

        }

        public void setTimeToResulSetZombie(long mlSeconds) {

                mlsecondsToZombie = mlSeconds;

        }

        private class ResultSetInfo{

                private ResultSet resultSet = null;

                private long lastUse = 0;

                public ResultSetInfo(ResultSet resulSet) {

                        this.resultSet = resulSet;

                        used();

                }

                private void used() {

                        lastUse = System.currentTimeMillis();

                }

                public ResultSet get() {

                        used();

                        return resultSet;

                }

                public boolean isZombie() {

                        return System.currentTimeMillis() - lastUse > mlsecondsToZombie;

                }

        }

        public final int createResultSet(String sql)

                        throws DataException {

                return createResultSet(sql, null);

        }

        public final int createResultSet(String sql, Object[] values)

                        throws DataException {

                synchronized (this) {

                        checksResulsets();

                        resourceBegin();

                        try {

                                ResultSetInfo newRs = new ResultSetInfo(createNewResultSet(sql,

                                                values));

                                int newId = getNewId();

                                if (newId < 0) {

                                        newId = resulsetList.size();

                                        resulsetList.add(newRs);

                                } else {

                                        resulsetList.set(newId, newRs);

                                }

                                if (logger.isDebugEnabled()) {

                                        logger.debug(" id: {} (total {})", newId,

                                                        getResultsetOpenCount());

                                }

                                return newId;

                        } finally {

                                resourceEnd();

                        }

                }

        }

        private int getNewId() {

                int newId;

                if (resulsetList.size() < 1) {

                        return -1;

                }

                for (newId = 0; newId < resulsetList.size(); newId++) {

                        if (resulsetList.get(newId) == null) {

                                return newId;

                        }

                }

                return -1;

        }

        protected final void forceCloseAllResultSet()

                        throws ResourceBeginException,

                        JDBCException {

                synchronized (this) {

                        Iterator iter = resulsetList.iterator();

                        Integer rsID = null;

                        while (iter.hasNext()) {

                                rsID = (Integer) iter.next();

                                if (rsID != null) {

                                        try {

                                                forceCloseResultSet(rsID.intValue());

                                        } catch (InvalidResultSetIdException e) {

                                                continue;

                                        }

                                }

                                iter.remove();

                        }

                }

        }

        protected final void forceCloseResultSet(int rsID)

                        throws ResourceBeginException, JDBCException,

                        InvalidResultSetIdException {

                logger.warn("Close forced of resultSet ({})", rsID);

                closeResulset(rsID);

        }

        protected final ResultSet getResultSet(int resultsetID)

                        throws InvalidResultSetIdException {

                if (resultsetID >= resulsetList.size()) {

                        throw new InvalidResultSetIdException(resultsetID);

                }

                ResultSetInfo rsInfo = (ResultSetInfo) resulsetList.get(resultsetID);

                if (rsInfo == null) {

                        throw new InvalidResultSetIdException(resultsetID);

                }

                return rsInfo.get();

        }

        private ResultSet dropResultSet(int resultsetID)

                        throws InvalidResultSetIdException {

                if (resultsetID >= resulsetList.size()) {

                        throw new InvalidResultSetIdException(resultsetID);

                }

                ResultSetInfo rsInfo = (ResultSetInfo) resulsetList.get(resultsetID);

                if (rsInfo == null) {

                        throw new InvalidResultSetIdException(resultsetID);

                }

                if (resultsetID == resulsetList.size() - 1) {

                        resulsetList.remove(resultsetID);

                } else {

                        resulsetList.set(resultsetID, null);

                }

                return rsInfo.get();

        }

        public final boolean resulsetNext(int resultsetID) throws JDBCException,

                        InvalidResultSetIdException, ResourceBeginException {

                ResultSet rs = getResultSet(resultsetID);

                resourceBegin();

                try {

                        return rs.next();

                } catch (SQLException e) {

                        throw new JDBCSQLException(e);

                } finally {

                        resourceEnd();

                }

        }

        public final void closeResulset(int resultsetID)

                        throws JDBCException,

                        InvalidResultSetIdException, ResourceBeginException {

                synchronized (this) {

                        resourceBegin();

                        try {

                                ResultSet rs = dropResultSet(resultsetID);

                                closeResulset(rs);

                                if (logger.isDebugEnabled()) {

                                        logger.debug(" id: " + resultsetID + " (total "

                                                        + getResultsetOpenCount() + ")");

                                }

                        } finally {

                                resourceEnd();

                        }

                        checksResulsets();

                }

        }

        public final void checksResulsets() throws JDBCException,

                        InvalidResultSetIdException, ResourceBeginException {

                synchronized (this) {

                        resourceBegin();

                        try {

                                ResultSetInfo rsInfo;

                                for (int i = 0; i < resulsetList.size(); i++) {

                                        rsInfo = (ResultSetInfo) resulsetList.get(i);

                                        if (rsInfo == null) {

                                                continue;

                                        }

                                        if (rsInfo.isZombie()) {

                                                forceCloseResultSet(i);

                                        }

                                }

                        } finally {

                                resourceEnd();

                        }

                }

        }

        private int getResultsetOpenCount() {

                int count = 0;

                Iterator iter = resulsetList.iterator();

                while (iter.hasNext()) {

                        if (iter.next() != null) {

                                count++;

                        }

                }

                return count;

        }

        protected void closeResulset(ResultSet rs) throws JDBCException,

                        ResourceBeginException {

                resourceBegin();

                try {

                        Statement st = rs.getStatement();

                        Connection con = st.getConnection();

                        try {

                                rs.close();

                        } finally {

                                // TODO revisar esto

                                try{ st.close();  } catch (Exception ex){ };

                                try{ con.close(); } catch (Exception ex){ };

                        }

                } catch (SQLException e) {

                        throw new JDBCSQLException(e);

                } finally {

                        resourceEnd();

                }

        }

        protected final int openResulsetCount() {

                int count = 0;

                Iterator iter = resulsetList.iterator();

                while (iter.hasNext()) {

                        if (iter.next() != null) {

                                count++;

                        }

                }

                return count;

        }

        public boolean closeResourceRequested(ResourceProvider resource) {

                try {

                        checksResulsets();

                        return openResulsetCount() == 0 && closeResource(resource);

                } catch (DataException e) {

                        logger.error("Exception throws", e);

                        return false;

                }

        }

        protected String fixFilter(String filter) {

                if (filter == null) {

                        return null;

                }

                return filter;

        }

        protected JDBCHelper createHelper() throws InitializeException {

                return new JDBCHelper(this, getJDBCParameters());

        }

        protected JDBCHelper getHelper() {

                return helper;

        }

        protected void resetCount() {

                totalCount = null;

        }

        /**

         * Get feature count for a <code>filter</code>.<br>

         *

         * <code>filter</code> can be <code>null</code>.<br>

         *

         * <strong>Note:</strong><br>

         * this method have to perform <code>resouceBegin</code> at the begining and

         * <code>resourceEnd</code> at the end of execution.

         *

         *

         * @param filter

         * @return

         * @throws DataException

         */

        protected long getCount(String filter) throws DataException {

                this.open();

                if (filter == null && totalCount != null) {

                        return totalCount.longValue();

                }

                long count = 0;

                String sql = compoundCountSelect(filter);

                resourceBegin();

                try {

                        ResultSet rs = createNewResultSet(sql, null);

                        try {

                                if (rs.next()) {

                                        count = rs.getLong(1);

                                }

                        } catch (SQLException e) {

                                throw new JDBCSQLException(e);

                        } finally {

                                closeResulset(rs);

                        }

                } finally {

                        resourceEnd();

                }

                if (filter == null) {

                        totalCount = new Long(count);

                }

                return count;

        }

        public void close() throws CloseException {

                helper.close();

        }

        public void open() throws OpenException {

                helper.open();

        }

        public FeatureProvider getFeatureProviderByReference(

                        FeatureReferenceProviderServices reference) throws DataException {

                return getFeatureProviderByReference(reference, getFeatureStore()

                                .getDefaultFeatureType());

        }

        public FeatureProvider getFeatureProviderByReference(

                        FeatureReferenceProviderServices reference, FeatureType featureType)

                        throws DataException {

                open();

                resourceBegin();

                try {

                        StringBuilder filter = new StringBuilder();

                        FeatureAttributeDescriptor[] pk = getFeatureStore().getFeatureType(

                                        featureType.getId()).getPrimaryKey();

                        List values = new ArrayList();

                        int i;

                        for (i = 0; i < pk.length - 1; i++) {

                                values.add(helper.dalValueToJDBC(pk[i], reference

                                                .getKeyValue(pk[i].getName())));

                                filter.append(helper.getSqlFieldName(pk[i]));

                                filter.append(" = ? AND ");

                        }

                        values.add(helper.dalValueToJDBC(pk[i], reference.getKeyValue(pk[i]

                                        .getName())));

                        filter.append(helper.getSqlFieldName(pk[i]));

                        filter.append(" = ? ");

                        String sql = compoundSelect(featureType, filter.toString(), null,

                                        1, 0);

                        FeatureProvider data;

                        int rsId = createResultSet(sql, values.toArray());

                        try {

                                if (!resulsetNext(rsId)) {

                                        // FIXME Exception

                                        throw new RuntimeException("Reference Not found");

                                }

                                data = createFeatureProvider(featureType);

                                loadFeatureProvider(data, rsId);

                        } finally {

                                closeResulset(rsId);

                        }

                        return data;

                } finally {

                        resourceEnd();

                }

        }

        public int getOIDType() {

                return DataTypes.UNKNOWN;

        }

        protected void initFeatureType() throws InitializeException {

                EditableFeatureType edFType = null;

                try {

                        edFType = this.getStoreServices().createFeatureType();

                        helper.loadFeatureType(edFType, getJDBCParameters());

                } catch (DataException e) {

                        throw new InitializeException(this.getName(), e);

                }

                FeatureType defaultType = edFType.getNotEditableCopy();

                List types = new ArrayList(1);

                types.add(defaultType);

                this.getStoreServices().setFeatureTypes(types, defaultType);

                try {

                        loadMetadata();

                } catch (DataException e) {

                        throw new InitializeException(e);

                }

        }

        protected ResultSet createNewResultSet(String sql, Object[] values)

                        throws DataException {

                this.open();

                Connection conn = null;

                PreparedStatement st = null;

                ResultSet rs = null;

                this.resourceBegin();

                try {

                        conn = this.helper.getConnection();

                        st = conn.prepareStatement(sql);

                        if (values != null) {

                                Object value;

                                for (int i = 0; i < values.length; i++) {

                                        value = values[i];

                                        if (value instanceof Geometry) {

                                                byte[] bytes;

                                                try {

                                                        bytes = (byte[]) ((Geometry) value)

                                                                        .invokeOperation(ToWKB.CODE, null);

                                                } catch (BaseException e) {

                                                        // FIXME

                                                        throw new InvalidParameterException();

                                                }

                                                st.setBytes(i + 1, bytes);

                                        }

                                        st.setObject(i + 1, value);

                                }

                        }

                        try {

                                rs = st.executeQuery();

                        } catch (SQLException e1) {

                                try {st.close();} catch (Exception e2) {};

                                try {conn.close();} catch (Exception e2) {}        ;

                                throw new JDBCExecuteSQLException(sql, e1);

                        }

                        rs.setFetchSize(5000); // TODO add to params?

                        return rs;

                } catch (SQLException e) {

                        // TODO throw exception ???

                        try {rs.close();} catch (Exception e1) {};

                        try {st.close();} catch (Exception e1) {};

                        try {conn.close();} catch (Exception e1) {};

                        throw new JDBCSQLException(e);

                } finally {

                        this.resourceEnd();

                }

        }

        /**

         * Permform a {@link Resource#begin()} to the current provider resources.

         *

         */

        protected void resourceBegin() throws ResourceBeginException {

                this.helper.begin();

        }

        /**

         * Permform a {@link Resource#end()} to the current provider resources.

         */

        protected void resourceEnd() {

                this.helper.end();

        }

        protected boolean closeResource(ResourceProvider resource) {

                try {

                        this.helper.close();

                } catch (CloseException e) {

                        logger.error("Exception in close Request", e);

                }

                return !this.helper.isOpen();

        }

        protected String compoundCountSelect(String filter) {

                if (this.directSQLMode) {

                        return null;

                }

                // Select

                StringBuilder sql = new StringBuilder();

                sql.append("Select count(");

                String[] pkFields = getJDBCParameters().getPkFields();

                if (pkFields != null && pkFields.length == 1) {

                        sql.append(helper.escapeFieldName(pkFields[0]));

                } else {

                        sql.append('*');

                }

                sql.append(") ");

                sql.append("from ");

                sql.append(getJDBCParameters().tableID());

                sql.append(' ');

                appendWhere(sql, filter);

                return sql.toString();

        }

        protected void appendWhere(StringBuilder sql, String filter) {

                filter = fixFilter(filter);

                String initialFilter = getJDBCParameters().getInitialFilter();

                if ((initialFilter != null && initialFilter.length() != 0)

                                || (filter != null && filter.length() != 0)) {

                        sql.append("where (");

                        if (initialFilter != null && initialFilter.length() != 0

                                        && filter != null && filter.length() != 0) {

                                // initialFilter + filter

                                sql.append('(');

                                sql.append(initialFilter);

                                sql.append(") and (");

                                sql.append(filter);

                                sql.append(')');

                        } else if (initialFilter != null && initialFilter.length() != 0) {

                                // initialFilter only

                                sql.append(initialFilter);

                        } else {

                                // filter only

                                sql.append(filter);

                        }

                        sql.append(") ");

                }

        }

        protected void loadMetadata() throws DataException {

                IProjection srs = getJDBCParameters().getSRS();

                if (srs == null) {

                        srs = getFeatureStore().getDefaultFeatureType().getDefaultSRS();

                }

                this.setDynValue("DefaultSRS", srs);

                String defGeomName = this.getFeatureStore().getDefaultFeatureType()

                                .getDefaultGeometryAttributeName();

                Envelope env = null;

                if (defGeomName != null && defGeomName.length() > 0) {

                        env = this.helper.getFullEnvelopeOfField(this.getJDBCParameters(),

                                        defGeomName, this.getJDBCParameters().getWorkingArea());

                }

                this.setDynValue("Envelope", env);

        }

        public void closeDone() throws DataException {

                clearMetadata();

        }

        public void opendDone() throws DataException {

                // Nothing to do

        }

        public Envelope getEnvelope() throws DataException {

                this.open();

                return (Envelope) this.getDynValue("Envelope");

        }

        public void resourceChanged(ResourceProvider resource) {

                this.getStoreServices().notifyChange(

                                DataStoreNotification.RESOURCE_CHANGED,

                                resource);

        }

        protected void clearMetadata() {

                this.setDynValue("DefaultSRS", null);

                this.setDynValue("Envelope", null);

        }

        public boolean allowAutomaticValues() {

                return this.helper.allowAutomaticValues();

        }

        public DataServerExplorer getExplorer() throws ReadException {

                DataManager manager = DALLocator.getDataManager();

                JDBCServerExplorerParameters exParams;

                JDBCStoreParameters params = getJDBCParameters();

                try {

                        exParams = (JDBCServerExplorerParameters) manager

                                        .createServerExplorerParameters(JDBCServerExplorer.NAME);

                        exParams.setHost(params.getHost());

                        exParams.setPort(params.getPort());

                        exParams.setDBName(params.getDBName());

                        exParams.setUser(params.getUser());

                        exParams.setPassword(params.getPassword());

                        exParams.setUrl(params.getUrl());

                        exParams.setCatalog(params.getCatalog());

                        exParams.setSchema(params.getSchema());

                        exParams.setJDBCDriverClassName(params.getJDBCDriverClassName());

                        return manager.createServerExplorer(exParams);

                } catch (DataException e) {

                        throw new ReadException(this.getName(), e);

                } catch (ValidateDataParametersException e) {

                        // TODO Auto-generated catch block

                        throw new ReadException(this.getName(), e);

                }

        }

        public void dispose() throws CloseException {

                this.close();

                resulsetList = null;

                this.helper.dispose();

                super.dispose();

        }

        public Object createNewOID() {

                return null;

        }

        public String compoundSelect(FeatureType type, String filter, String order,

                        long limit, long offset) throws DataException {

                StringBuilder sql = new StringBuilder();

                JDBCStoreParameters params = getJDBCParameters();

                if (directSQLMode) {

                        if (filter != null || order != null) {

                                // FIXME Exception

                                throw new UnsupportedOperationException();

                        }

                        sql.append(params.getSQL());

                        sql.append(' ');

                } else {

                        FeatureAttributeDescriptor[] fields = type

                                        .getAttributeDescriptors();

                        // Select

                        sql.append("Select ");

                        for (int i = 0; i < fields.length - 1; i++) {

                                sql.append(helper.getSqlFieldName(fields[i]));

                                sql.append(", ");

                        }

                        sql.append(helper.getSqlFieldName(fields[fields.length - 1]));

                        sql.append(' ');

                        FeatureAttributeDescriptor[] pkFields = getStoreServices()

                                        .getProviderFeatureType(type.getId()).getPrimaryKey();

                        if (pkFields != null && pkFields.length > 0) {

                                // checks for pk fields are in select

                                boolean toAdd;

                                for (int i = 0; i < pkFields.length; i++) {

                                        toAdd = true;

                                        for (int j = 0; j < fields.length; j++) {

                                                if (pkFields[i].getName().equals(fields[j].getName())) {

                                                        toAdd = false;

                                                        break;

                                                }

                                                if (toAdd) {

                                                        sql.append(", ");

                                                        sql.append(helper.getSqlFieldName(pkFields[i]));

                                                }

                                        }

                                }

                                sql.append(' ');

                        }

                        // table

                        sql.append("from ");

                        sql.append(params.tableID());

                        sql.append(' ');

                        // Where

                        appendWhere(sql, filter);

                        // Order

                        if ((params.getInitialOrder() != null && params.getInitialOrder()

                                        .length() != 0)

                                        || (order != null && order.length() != 0)) {

                                sql.append("order by ");

                                if (order != null && order.length() != 0) {

                                        // order

                                        sql.append(order);

                                } else {

                                        // initial order

                                        sql.append(params.getInitialOrder());

                                }

                                sql.append(' ');

                        }

                }

                // limit offset

                if (limit >= 1 || offset >= 1) {

                        sql.append(helper.compoundLimitAndOffset(limit,offset));

                }

                return sql.toString();

        }

        public long getFeatureCount() throws DataException {

                return getCount(null);

        }

        public String getName() {

                return NAME;

        }

        public boolean hasGeometrySupport() {

                return false;

        }

        public FeatureSetProvider createSet(FeatureQuery query,

                        FeatureType featureType) throws DataException {

                return new JDBCSetProvider(this, query, featureType);

        }

        public Object getSourceId() {

                return this.getJDBCParameters().getSourceId();

        }

}