Java SQLWarning.initCause方法代碼示例

import java.sql.SQLWarning; //導入方法依賴的package包/類
/**
     * Sets the value of the client info property specified by name to the
     * value specified by value.
     * <p>
     * Applications may use the <code>DatabaseMetaData.getClientInfoProperties</code>
     * method to determine the client info properties supported by the driver
     * and the maximum length that may be specified for each property.
     * <p>
     * The driver stores the value specified in a suitable location in the
     * database.  For example in a special register, session parameter, or
     * system table column.  For efficiency the driver may defer setting the
     * value in the database until the next time a statement is executed or
     * prepared.  Other than storing the client information in the appropriate
     * place in the database, these methods shall not alter the behavior of
     * the connection in anyway.  The values supplied to these methods are
     * used for accounting, diagnostics and debugging purposes only.
     * <p>
     * The driver shall generate a warning if the client info name specified
     * is not recognized by the driver.
     * <p>
     * If the value specified to this method is greater than the maximum
     * length for the property the driver may either truncate the value and
     * generate a warning or generate a <code>SQLClientInfoException</code>.  If the driver
     * generates a <code>SQLClientInfoException</code>, the value specified was not set on the
     * connection.
     * <p>
     * The following are standard client info properties.  Drivers are not
     * required to support these properties however if the driver supports a
     * client info property that can be described by one of the standard
     * properties, the standard property name should be used.
     * <p>
     * <ul>
     * <li>ApplicationName      -       The name of the application currently utilizing
     *                                                  the connection</li>
     * <li>ClientUser           -       The name of the user that the application using
     *                                                  the connection is performing work for.  This may
     *                                                  not be the same as the user name that was used
     *                                                  in establishing the connection.</li>
     * <li>ClientHostname       -       The hostname of the computer the application
     *                                                  using the connection is running on.</li>
     * </ul>
     * <p>
     * @param name              The name of the client info property to set
     * @param value             The value to set the client info property to.  If the
     *                                  value is null, the current value of the specified
     *                                  property is cleared.
     * <p>
     * @throws  SQLClientInfoException if the database server returns an error while
     *                  setting the client info value on the database server or this method
     * is called on a closed connection
     * <p>
     * @since JDK 1.6, HSQLDB 1.9.0
     */
//#ifdef JAVA6
    public void setClientInfo(String name,
                              String value) throws SQLClientInfoException {

        try {
            checkClosed();
        } catch (SQLException ex) {
            SQLClientInfoException e =
                new SQLClientInfoException(ex.getMessage(), null);

            e.initCause(ex);

            throw e;
        }

        SQLWarning warning = new SQLWarning("ClientInfo name not recognized: "
            + name);

        warning.initCause(Util.notSupported());
        addWarning(warning);
    }