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Driver.java
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1998-09-22
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/*
* @(#)Driver.java 1.6 98/07/01
*
* Copyright 1995-1998 by Sun Microsystems, Inc.,
* 901 San Antonio Road, Palo Alto, California, 94303, U.S.A.
* All rights reserved.
*
* This software is the confidential and proprietary information
* of Sun Microsystems, Inc. ("Confidential Information"). You
* shall not disclose such Confidential Information and shall use
* it only in accordance with the terms of the license agreement
* you entered into with Sun.
*/
package java.sql;
/**
* <P>The Java SQL framework allows for multiple database drivers.
*
* <P>Each driver should supply a class that implements
* the Driver interface.
*
* <P>The DriverManager will try to load as many drivers as it can
* find and then for any given connection request, it will ask each
* driver in turn to try to connect to the target URL.
*
* <P>It is strongly recommended that each Driver class should be
* small and standalone so that the Driver class can be loaded and
* queried without bringing in vast quantities of supporting code.
*
* <P>When a Driver class is loaded, it should create an instance of
* itself and register it with the DriverManager. This means that a
* user can load and register a driver by doing
* Class.forName("foo.bah.Driver").
*
* @see DriverManager
* @see Connection
*/
public interface Driver {
/**
* Try to make a database connection to the given URL.
* The driver should return "null" if it realizes it is the wrong kind
* of driver to connect to the given URL. This will be common, as when
* the JDBC driver manager is asked to connect to a given URL it passes
* the URL to each loaded driver in turn.
*
* <P>The driver should raise a SQLException if it is the right
* driver to connect to the given URL, but has trouble connecting to
* the database.
*
* <P>The java.util.Properties argument can be used to passed arbitrary
* string tag/value pairs as connection arguments.
* Normally at least "user" and "password" properties should be
* included in the Properties.
*
* @param url The URL of the database to connect to
* @param info a list of arbitrary string tag/value pairs as
* connection arguments; normally at least a "user" and
* "password" property should be included
* @return a Connection to the URL
* @exception SQLException if a database-access error occurs.
*/
Connection connect(String url, java.util.Properties info)
throws SQLException;
/**
* Returns true if the driver thinks that it can open a connection
* to the given URL. Typically drivers will return true if they
* understand the subprotocol specified in the URL and false if
* they don't.
*
* @param url The URL of the database.
* @return True if this driver can connect to the given URL.
* @exception SQLException if a database-access error occurs.
*/
boolean acceptsURL(String url) throws SQLException;
/**
* <p>The getPropertyInfo method is intended to allow a generic GUI tool to
* discover what properties it should prompt a human for in order to get
* enough information to connect to a database. Note that depending on
* the values the human has supplied so far, additional values may become
* necessary, so it may be necessary to iterate though several calls
* to getPropertyInfo.
*
* @param url The URL of the database to connect to.
* @param info A proposed list of tag/value pairs that will be sent on
* connect open.
* @return An array of DriverPropertyInfo objects describing possible
* properties. This array may be an empty array if no properties
* are required.
* @exception SQLException if a database-access error occurs.
*/
DriverPropertyInfo[] getPropertyInfo(String url, java.util.Properties info)
throws SQLException;
/**
* Get the driver's major version number. Initially this should be 1.
*/
int getMajorVersion();
/**
* Get the driver's minor version number. Initially this should be 0.
*/
int getMinorVersion();
/**
* Report whether the Driver is a genuine JDBC COMPLIANT (tm) driver.
* A driver may only report "true" here if it passes the JDBC compliance
* tests, otherwise it is required to return false.
*
* JDBC compliance requires full support for the JDBC API and full support
* for SQL 92 Entry Level. It is expected that JDBC compliant drivers will
* be available for all the major commercial databases.
*
* This method is not intended to encourage the development of non-JDBC
* compliant drivers, but is a recognition of the fact that some vendors
* are interested in using the JDBC API and framework for lightweight
* databases that do not support full database functionality, or for
* special databases such as document information retrieval where a SQL
* implementation may not be feasible.
*/
boolean jdbcCompliant();
}