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Liquibase extensions for Teradata.

There is a newer version: 4.31.0

/**
 * Copyright 2010 Open Pricer
 *
 * 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 liquibase.ext.teradata.sqlgenerator;

import liquibase.database.Database;
import liquibase.ext.teradata.database.TeradataDatabase;
import liquibase.sql.Sql;
import liquibase.sql.UnparsedSql;
import liquibase.sqlgenerator.SqlGeneratorChain;
import liquibase.sqlgenerator.core.SetNullableGenerator;
import liquibase.statement.core.AddColumnStatement;
import liquibase.statement.core.SetNullableStatement;

/**
 * Teradata specific syntax for altering column nullability
 *
 */
public class SetNullableGeneratorTeradata extends SetNullableGenerator {

    @Override
    public int getPriority() {
        return PRIORITY_DATABASE;
    }


	@Override
	public boolean supports(SetNullableStatement statement, Database database) {
		return database instanceof TeradataDatabase;
	}

	@Override
	public Sql[] generateSql(SetNullableStatement statement, Database database, SqlGeneratorChain sqlGeneratorChain) {
		return new Sql[] { new UnparsedSql("ALTER TABLE " + database.escapeTableName(statement.getCatalogName(), statement.getSchemaName(), statement.getTableName()) + " ADD "
				+ database.escapeColumnName(statement.getCatalogName(), statement.getSchemaName(), statement.getTableName(), statement.getColumnName())
				+ (statement.isNullable()?"":" NOT ") + " NULL" ) };
	}

}