liquibase.ext.teradata.sqlgenerator.AddDefaultValueGeneratorTeradata Maven / Gradle / Ivy

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Liquibase extensions for Teradata.
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/**
 * 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.datatype.DataTypeFactory;
import liquibase.datatype.LiquibaseDataType;
import liquibase.datatype.core.DateTimeType;
import liquibase.datatype.core.DateType;
import liquibase.datatype.core.TimeType;
import liquibase.ext.teradata.database.TeradataDatabase;
import liquibase.sql.Sql;
import liquibase.sql.UnparsedSql;
import liquibase.sqlgenerator.SqlGeneratorChain;
import liquibase.sqlgenerator.core.AddDefaultValueGenerator;
import liquibase.statement.core.AddDefaultValueStatement;
import liquibase.structure.core.Column;
import liquibase.structure.core.Schema;
import liquibase.structure.core.Table;


/**
 * Teradata syntax for adding default value
 *
 */
public class AddDefaultValueGeneratorTeradata extends AddDefaultValueGenerator {

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

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

	/**
	 * @see liquibase.sqlgenerator.core.AddDefaultValueGenerator#generateSql(liquibase.statement.core.AddDefaultValueStatement, liquibase.database.Database, liquibase.sqlgenerator.SqlGeneratorChain)
	 */
	@Override
	public Sql[] generateSql(AddDefaultValueStatement statement, Database database, SqlGeneratorChain sqlGeneratorChain) {
		Object defaultValue = statement.getDefaultValue();
        LiquibaseDataType defaultValueType = DataTypeFactory.getInstance().fromObject(defaultValue, database);
		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())
                        + " DEFAULT "
						+ (defaultValueType instanceof DateTimeType ?" TIMESTAMP ":(defaultValueType instanceof DateType ?" DATE ":(defaultValueType instanceof TimeType ?" TIME ":"")))
						+ defaultValueType.objectToSql(defaultValue, database),
						new Column().setRelation(new Table().setName(statement.getTableName()).setSchema(new Schema(statement.getCatalogName(), statement.getSchemaName())).setName(statement.getColumnName())))
		};
	}
}