https://github.com/Microsoft/mssql-jdbc: Microsoft JDBC Driver for SQL Server. (Microsoft Corporation) 
/*
 * Microsoft JDBC Driver for SQL Server Copyright(c) Microsoft Corporation All rights reserved. This program is made
 * available under the terms of the MIT License. See the LICENSE file in the project root for more information.
 */

package com.microsoft.sqlserver.jdbc;

import java.sql.SQLException;



Provides an interface to the SQLServerConnection43 class. 
/**
 * Provides an interface to the {@link SQLServerConnection43} class.
 */
public interface ISQLServerConnection43 extends ISQLServerConnection {

    
Hints to the driver that a request, an independent unit of work, is beginning on this connection. It backs up the values of the connection properties that are modifiable through public methods. Each request is independent of all other requests with regard to state local to the connection either on the client or the server. Work done between beginRequest, endRequest pairs does not depend on any other work done on the connection either as part of another request or outside of any request. A request may include multiple transactions. There may be dependencies on committed database state as that is not local to the connection. beginRequest marks the beginning of the work unit. 

Local state is defined as any state associated with a Connection that is local to the current Connection either
in the client or the database that is not transparently reproducible.

 Calls to beginRequest and endRequest are not nested. Multiple calls to beginRequest without an intervening call to endRequest is not an error. The first beginRequest call marks the start of the request and subsequent calls are treated as a no-op It is recommended to enclose each unit of work in beginRequest, endRequest pairs such that there is no open transaction at the beginning or end of the request and no dependency on local state that crosses request boundaries. Committed database state is not local. This method is to be used by Connection pooling managers. 
 The pooling manager should call beginRequest on the underlying connection prior to returning a connection to the caller. 


Throws:
See Also:
/**
     * Hints to the driver that a request, an independent unit of work, is beginning on this connection. It backs up the
     * values of the connection properties that are modifiable through public methods. Each request is independent of
     * all other requests with regard to state local to the connection either on the client or the server. Work done
     * between {@code beginRequest}, {@code endRequest} pairs does not depend on any other work done on the connection
     * either as part of another request or outside of any request. A request may include multiple transactions. There
     * may be dependencies on committed database state as that is not local to the connection. {@code beginRequest}
     * marks the beginning of the work unit.
     * <p>
     * Local state is defined as any state associated with a Connection that is local to the current Connection either
     * in the client or the database that is not transparently reproducible.
     * <p>
     * Calls to {@code beginRequest} and {@code endRequest} are not nested. Multiple calls to {@code beginRequest}
     * without an intervening call to {@code endRequest} is not an error. The first {@code beginRequest} call marks the
     * start of the request and subsequent calls are treated as a no-op It is recommended to enclose each unit of work
     * in {@code beginRequest}, {@code endRequest} pairs such that there is no open transaction at the beginning or end
     * of the request and no dependency on local state that crosses request boundaries. Committed database state is not
     * local.
     *
     * This method is to be used by Connection pooling managers.
     * <p>
     * The pooling manager should call {@code beginRequest} on the underlying connection prior to returning a connection
     * to the caller.
     * <p>
     * 
     * @throws SQLException
     *         if an error occurs
     * @see #endRequest()
     */
    @Override
    void beginRequest() throws SQLException;

    
Hints to the driver that a request, an independent unit of work, has completed. It rolls back the open transactions. Resets the connection properties that are modifiable through public methods back to their original values. Calls to beginRequest and endRequest are not nested. Multiple calls to endRequest without an intervening call to beginRequest is not an error. The first endRequest call marks the request completed and subsequent calls are treated as a no-op. If endRequest is called without an initial call to beginRequest is a no-op. This method is to be used by Connection pooling managers. 


Throws:
See Also:
/**
     * Hints to the driver that a request, an independent unit of work, has completed. It rolls back the open
     * transactions. Resets the connection properties that are modifiable through public methods back to their original
     * values. Calls to {@code beginRequest} and {@code endRequest} are not nested. Multiple calls to {@code endRequest}
     * without an intervening call to {@code beginRequest} is not an error. The first {@code endRequest} call marks the
     * request completed and subsequent calls are treated as a no-op. If {@code endRequest} is called without an initial
     * call to {@code beginRequest} is a no-op. This method is to be used by Connection pooling managers.
     * <p>
     * 
     * @throws SQLException
     *         if an error occurs
     * @see #beginRequest()
     */
    @Override
    void endRequest() throws SQLException;
}