TXWrap.java

/***************************************************************************
   Copyright 2012 Emily Estes

   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 net.metanotion.sqlc;


import java.sql.Connection;
import java.sql.SQLException;
import java.util.Map;

public final class TXWrap<V> implements QueryExpr<V> {
	public final QueryExpr<V> expr;
	public TXWrap(final QueryExpr<V> body) { this.expr = body; }

	public V eval(final Connection conn, final Map<String,Object> env) throws SQLException {
		try {
			conn.setAutoCommit(false);
			return expr.eval(conn, env);
		} catch (final Exception e) {
			conn.rollback();
			throw new RuntimeException(e);
		} finally {
			conn.setAutoCommit(true);
		}
	}
}