TeradataMetaModel.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.teradata.model;

import org.jkiss.code.Nullable;
import org.jkiss.dbeaver.DBException;
import org.jkiss.dbeaver.ext.generic.model.GenericDataSource;
import org.jkiss.dbeaver.ext.generic.model.GenericProcedure;
import org.jkiss.dbeaver.ext.generic.model.GenericTable;
import org.jkiss.dbeaver.ext.generic.model.GenericTableColumn;
import org.jkiss.dbeaver.ext.generic.model.meta.GenericMetaModel;
import org.jkiss.dbeaver.model.DBPDataSource;
import org.jkiss.dbeaver.model.DBPEvaluationContext;
import org.jkiss.dbeaver.model.DBUtils;
import org.jkiss.dbeaver.model.data.DBDPreferences;
import org.jkiss.dbeaver.model.data.DBDValueHandler;
import org.jkiss.dbeaver.model.data.DBDValueHandlerProvider;
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.data.handlers.JDBCContentValueHandler;
import org.jkiss.dbeaver.model.runtime.DBRProgressMonitor;
import org.jkiss.dbeaver.model.struct.DBSTypedObject;

import java.sql.SQLException;

/**
 * TeradataMetaModel
 */
public class TeradataMetaModel extends GenericMetaModel implements DBDValueHandlerProvider
{
    public TeradataMetaModel() {
        super();
    }

    @Override
    public String getTableDDL(DBRProgressMonitor monitor, GenericTable sourceObject) throws DBException {
        GenericDataSource dataSource = sourceObject.getDataSource();
        boolean isView = sourceObject.isView();
        try (JDBCSession session = DBUtils.openMetaSession(monitor, dataSource, "Read Teradata object DDL")) {
            try (JDBCPreparedStatement dbStat = session.prepareStatement(
                "SHOW " + (isView ? "VIEW" : "TABLE") + " " + sourceObject.getFullyQualifiedName(DBPEvaluationContext.DDL))) {
                try (JDBCResultSet dbResult = dbStat.executeQuery()) {
                    StringBuilder sql = new StringBuilder();
                    while (dbResult.nextRow()) {
                        sql.append(dbResult.getString(1));
                    }
                    return sql.toString();
                }
            }
        } catch (SQLException e) {
            throw new DBException(e, dataSource);
        }
    }

    public String getViewDDL(DBRProgressMonitor monitor, GenericTable sourceObject) throws DBException {
        return getTableDDL(monitor, sourceObject);
    }

    @Override
    public String getProcedureDDL(DBRProgressMonitor monitor, GenericProcedure sourceObject) throws DBException {
        GenericDataSource dataSource = sourceObject.getDataSource();
        try (JDBCSession session = DBUtils.openMetaSession(monitor, dataSource, "Read Teradata procedure source")) {
            try (JDBCPreparedStatement dbStat = session.prepareStatement(
                "SHOW PROCEDURE " + sourceObject.getFullyQualifiedName(DBPEvaluationContext.DDL))) {
                try (JDBCResultSet dbResult = dbStat.executeQuery()) {
                    StringBuilder sql = new StringBuilder();
                    while (dbResult.nextRow()) {
                        sql.append(dbResult.getString(1));
                    }
                    return sql.toString();
                }
            }
        } catch (SQLException e) {
            throw new DBException(e, dataSource);
        }
    }

    @Override
    public String getAutoIncrementClause(GenericTableColumn column) {
        return "GENERATED ALWAYS AS IDENTITY";
    }

    @Nullable
    @Override
    public DBDValueHandler getValueHandler(DBPDataSource dataSource, DBDPreferences preferences, DBSTypedObject typedObject) {
        if ("JSON".equals(typedObject.getTypeName())) {
            return JDBCContentValueHandler.INSTANCE;
        }
        return null;
    }
}