SQLiteMetaModel.java

/*
 * DBeaver - Universal Database Manager
 * Copyright (C) 2010-2017 Serge Rider (serge@jkiss.org)
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.jkiss.dbeaver.ext.sqlite.model;

import org.jkiss.code.NotNull;
import org.jkiss.code.Nullable;
import org.jkiss.dbeaver.DBException;
import org.jkiss.dbeaver.ext.generic.model.*;
import org.jkiss.dbeaver.ext.generic.model.meta.GenericMetaModel;
import org.jkiss.dbeaver.ext.sqlite.SQLiteUtils;
import org.jkiss.dbeaver.model.DBPDataSourceContainer;
import org.jkiss.dbeaver.model.DBUtils;
import org.jkiss.dbeaver.model.exec.DBCQueryTransformProvider;
import org.jkiss.dbeaver.model.exec.DBCQueryTransformType;
import org.jkiss.dbeaver.model.exec.DBCQueryTransformer;
import org.jkiss.dbeaver.model.exec.jdbc.JDBCPreparedStatement;
import org.jkiss.dbeaver.model.exec.jdbc.JDBCResultSet;
import org.jkiss.dbeaver.model.exec.jdbc.JDBCSession;
import org.jkiss.dbeaver.model.impl.jdbc.JDBCUtils;
import org.jkiss.dbeaver.model.impl.jdbc.cache.JDBCBasicDataTypeCache;
import org.jkiss.dbeaver.model.impl.sql.QueryTransformerLimit;
import org.jkiss.dbeaver.model.runtime.DBRProgressMonitor;

import java.sql.SQLException;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;

/**
 * SQLiteMetaModel
 */
public class SQLiteMetaModel extends GenericMetaModel implements DBCQueryTransformProvider
{

    public SQLiteMetaModel() {
        super();
    }

    public String getViewDDL(DBRProgressMonitor monitor, GenericTable sourceObject) throws DBException {
        return SQLiteUtils.readMasterDefinition(monitor, sourceObject.getDataSource(), SQLiteObjectType.view, sourceObject.getName(), sourceObject);
    }

    @Override
    public String getTableDDL(DBRProgressMonitor monitor, GenericTable sourceObject) throws DBException {
        return SQLiteUtils.readMasterDefinition(monitor, sourceObject.getDataSource(), SQLiteObjectType.table, sourceObject.getName(), sourceObject);
    }

    @Override
    public String getTriggerDDL(@NotNull DBRProgressMonitor monitor, @NotNull GenericTrigger trigger) throws DBException {
        return SQLiteUtils.readMasterDefinition(monitor, trigger.getDataSource(), SQLiteObjectType.trigger, trigger.getName(), trigger.getTable());
    }

    @Override
    public boolean supportsTriggers(@NotNull GenericDataSource dataSource) {
        return true;
    }

    @Override
    public boolean supportsDatabaseTriggers(@NotNull GenericDataSource dataSource) {
        return false;
    }

    @Override
    public List<? extends GenericTrigger> loadTriggers(DBRProgressMonitor monitor, @NotNull GenericStructContainer container, @Nullable GenericTable table) throws DBException {
        if (table == null) {
            return Collections.emptyList();
        }
        try (JDBCSession session = DBUtils.openMetaSession(monitor, container.getDataSource(), "Read triggers")) {
            try (JDBCPreparedStatement dbStat = session.prepareStatement("SELECT name FROM sqlite_master WHERE type='trigger' AND tbl_name=?")) {
                dbStat.setString(1, table.getName());
                List<GenericTrigger> result = new ArrayList<>();
                try (JDBCResultSet dbResult = dbStat.executeQuery()) {
                    while (dbResult.next()) {
                        String name = JDBCUtils.safeGetString(dbResult, 1);
                        result.add(new GenericTrigger(container, table, name, null));
                    }
                }
                return result;
            }
        } catch (SQLException e) {
            throw new DBException(e, container.getDataSource());
        }
    }

    @Nullable
    @Override
    public DBCQueryTransformer createQueryTransformer(@NotNull DBCQueryTransformType type) {
        if (type == DBCQueryTransformType.RESULT_SET_LIMIT) {
            return new QueryTransformerLimit(false);
        }
        return null;
    }
    
    @Override
    public GenericDataSource createDataSource(DBRProgressMonitor monitor, DBPDataSourceContainer container) throws DBException {
        return new SQLiteDataSource(monitor, container, this);
    }

    @Override
    public JDBCBasicDataTypeCache createDataTypeCache(@NotNull DBPDataSourceContainer container) {
        return new SQLiteDataTypeCache(container);
    }

    @Override
    public GenericTable createTableImpl(GenericStructContainer container, @Nullable String tableName, @Nullable String tableType, @Nullable JDBCResultSet dbResult) {
        return new SQLiteTable(container, tableName, tableType, dbResult);
    }

    @Override
    public boolean isSystemTable(GenericTable table) {
        return table.getName().startsWith("sqlite_");
    }

    @Override
    public boolean supportsSequences(@NotNull GenericDataSource dataSource) {
        return true;
    }

    @Override
    public List<GenericSequence> loadSequences(@NotNull DBRProgressMonitor monitor, @NotNull GenericStructContainer container) throws DBException {
        try (JDBCSession session = DBUtils.openMetaSession(monitor, container.getDataSource(), "Read sequences")) {
            try (JDBCPreparedStatement dbStat = session.prepareStatement("SELECT * FROM sqlite_sequence")) {
                List<GenericSequence> result = new ArrayList<>();
                try (JDBCResultSet dbResult = dbStat.executeQuery()) {
                    while (dbResult.next()) {
                        String name = JDBCUtils.safeGetString(dbResult, 1);
                        long value = JDBCUtils.safeGetLong(dbResult, 2);
                        result.add(new GenericSequence(container, name, null, value, 0, Long.MAX_VALUE, 1));
                    }
                }
                return result;
            }
        } catch (SQLException e) {
            throw new DBException(e, container.getDataSource());
        }
    }
}