jdbcstatement.java

hsqldb是100％java实现的数据库,是一个开放源代码的JAVA数据库 l 具有标准的SQL语法和JAVA接口 l HSQLDB可以自由使用和分发 l 非常简洁和快速的

     * @param columnIndexes an array of column indexes indicating the columns
     *    that should be returned from the inserted row
     * @return either the row count for <code>INSERT</code>, <code>UPDATE</code>,
     *     or <code>DELETE</code> statements, or 0 for SQL statements
     *     that return nothing
     * @exception SQLException if a database access error occurs or the SQL
     *        statement returns a <code>ResultSet</code> object
     * @since JDK 1.4, HSQLDB 1.7
     */
//#ifdef JDBC3
    public int executeUpdate(String sql,
                             int[] columnIndexes) throws SQLException {
        throw Util.notSupported();
    }

//#endif JDBC3

    /**
     * <!-- start generic documentation -->
     * Executes the given SQL statement and signals the driver that the
     * auto-generated keys indicated in the given array should be made available
     * for retrieval.  The driver will ignore the array if the SQL statement
     * is not an <code>INSERT</code> statement. <p>
     * <!-- end generic documentation -->
     *
     * <!-- start release-specific documentation -->
     * <div class="ReleaseSpecificDocumentation">
     * <h3>HSQLDB-Specific Information:</h3> <p>
     *
     * HSQLDB 1.7.2 does not support this feature. <p>
     *
     * Calling this method always throws an <code>SQLException</code>,
     * stating that the function is not supported.
     * </div>
     * <!-- end release-specific documentation -->
     *
     * @param sql an SQL <code>INSERT</code>, <code>UPDATE</code> or
     *    <code>DELETE</code> statement or an SQL statement that returns nothing
     * @param columnNames an array of the names of the columns that should be
     *    returned from the inserted row
     * @return either the row count for <code>INSERT</code>, <code>UPDATE</code>,
     *     or <code>DELETE</code> statements, or 0 for SQL statements
     *     that return nothing
     * @exception SQLException if a database access error occurs
     * @since JDK 1.4, HSQLDB 1.7
     */
//#ifdef JDBC3
    public int executeUpdate(String sql,
                             String[] columnNames) throws SQLException {
        throw Util.notSupported();
    }

//#endif JDBC3

    /**
     * <!-- start generic documentation -->
     * Executes the given SQL statement, which may return multiple results,
     * and signals the driver that any
     * auto-generated keys should be made available
     * for retrieval.  The driver will ignore this signal if the SQL statement
     * is not an <code>INSERT</code> statement.
     * <P>
     * In some (uncommon) situations, a single SQL statement may return
     * multiple result sets and/or update counts.  Normally you can ignore
     * this unless you are (1) executing a stored procedure that you know may
     * return multiple results or (2) you are dynamically executing an
     * unknown SQL string.
     * <P>
     * The <code>execute</code> method executes an SQL statement and indicates the
     * form of the first result.  You must then use the methods
     * <code>getResultSet</code> or <code>getUpdateCount</code>
     * to retrieve the result, and <code>getMoreResults</code> to
     * move to any subsequent result(s). <p>
     * <!-- end generic documentation -->
     *
     * <!-- start release-specific documentation -->
     * <div class="ReleaseSpecificDocumentation">
     * <h3>HSQLDB-Specific Information:</h3> <p>
     *
     * HSQLDB 1.7.2 does not support this feature. <p>
     *
     * Calling this method always throws an <code>SQLException</code>,
     * stating that the function is not supported.
     * </div>
     * <!-- end release-specific documentation -->
     *
     * @param sql any SQL statement
     * @param autoGeneratedKeys a constant indicating whether auto-generated
     *    keys should be made available for retrieval using the method
     *    <code>getGeneratedKeys</code>; one of the following constants:
     *    <code>Statement.RETURN_GENERATED_KEYS</code> or
     *      <code>Statement.NO_GENERATED_KEYS</code>
     * @return <code>true</code> if the first result is a <code>ResultSet</code>
     *     object; <code>false</code> if it is an update count or there are
     *     no results
     * @exception SQLException if a database access error occurs
     * @see #getResultSet
     * @see #getUpdateCount
     * @see #getMoreResults
     * @see #getGeneratedKeys
     * @since JDK 1.4, HSQLDB 1.7
     */
//#ifdef JDBC3
    public boolean execute(String sql,
                           int autoGeneratedKeys) throws SQLException {
        throw Util.notSupported();
    }

//#endif JDBC3

    /**
     * <!-- start generic documentation -->
     * Executes the given SQL statement, which may return multiple results,
     * and signals the driver that the
     * auto-generated keys indicated in the given array should be made available
     * for retrieval.  This array contains the indexes of the columns in the
     * target table that contain the auto-generated keys that should be made
     * available. The driver will ignore the array if the given SQL statement
     * is not an <code>INSERT</code> statement.
     * <P>
     * Under some (uncommon) situations, a single SQL statement may return
     * multiple result sets and/or update counts.  Normally you can ignore
     * this unless you are (1) executing a stored procedure that you know may
     * return multiple results or (2) you are dynamically executing an
     * unknown SQL string.
     * <P>
     * The <code>execute</code> method executes an SQL statement and indicates the
     * form of the first result.  You must then use the methods
     * <code>getResultSet</code> or <code>getUpdateCount</code>
     * to retrieve the result, and <code>getMoreResults</code> to
     * move to any subsequent result(s). <p>
     * <!-- end generic documentation -->
     *
     * <!-- start release-specific documentation -->
     * <div class="ReleaseSpecificDocumentation">
     * <h3>HSQLDB-Specific Information:</h3> <p>
     *
     * HSQLDB 1.7.2 does not support this feature. <p>
     *
     * Calling this method always throws an <code>SQLException</code>,
     * stating that the function is not supported.
     * </div>
     * <!-- end release-specific documentation -->
     *
     * @param sql any SQL statement
     * @param columnIndexes an array of the indexes of the columns in the
     *    inserted row that should be  made available for retrieval by a
     *    call to the method <code>getGeneratedKeys</code>
     * @return <code>true</code> if the first result is a <code>ResultSet</code>
     *     object; <code>false</code> if it is an update count or there
     *     are no results
     * @exception SQLException if a database access error occurs
     * @see #getResultSet
     * @see #getUpdateCount
     * @see #getMoreResults
     * @since JDK 1.4, HSQLDB 1.7
     */
//#ifdef JDBC3
    public boolean execute(String sql,
                           int[] columnIndexes) throws SQLException {
        throw Util.notSupported();
    }

//#endif JDBC3

    /**
     * <!-- start generic documentation -->
     * Executes the given SQL statement, which may return multiple results,
     * and signals the driver that the
     * auto-generated keys indicated in the given array should be made available
     * for retrieval. This array contains the names of the columns in the
     * target table that contain the auto-generated keys that should be made
     * available. The driver will ignore the array if the given SQL statement
     * is not an <code>INSERT</code> statement.
     * <P>
     * In some (uncommon) situations, a single SQL statement may return
     * multiple result sets and/or update counts.  Normally you can ignore
     * this unless you are (1) executing a stored procedure that you know may
     * return multiple results or (2) you are dynamically executing an
     * unknown SQL string.
     * <P>
     * The <code>execute</code> method executes an SQL statement and indicates the
     * form of the first result.  You must then use the methods
     * <code>getResultSet</code> or <code>getUpdateCount</code>
     * to retrieve the result, and <code>getMoreResults</code> to
     * move to any subsequent result(s). <p>
     * <!-- end generic documentation -->
     *
     * <!-- start release-specific documentation -->
     * <div class="ReleaseSpecificDocumentation">
     * <h3>HSQLDB-Specific Information:</h3> <p>
     *
     * HSQLDB 1.7.2 does not support this feature. <p>
     *
     * Calling this method always throws an <code>SQLException</code>,
     * stating that the function is not supported.
     * </div>
     * <!-- end release-specific documentation -->
     *
     * @param sql any SQL statement
     * @param columnNames an array of the names of the columns in the inserted
     *    row that should be made available for retrieval by a call to the
     *    method <code>getGeneratedKeys</code>
     * @return <code>true</code> if the next result is a <code>ResultSet</code>
     *     object; <code>false</code> if it is an update count or there
     *     are no more results
     * @exception SQLException if a database access error occurs
     * @see #getResultSet
     * @see #getUpdateCount
     * @see #getMoreResults
     * @see #getGeneratedKeys
     * @since JDK 1.4, HSQLDB 1.7
     */
//#ifdef JDBC3
    public boolean execute(String sql,
                           String[] columnNames) throws SQLException {
        throw Util.notSupported();
    }

//#endif JDBC3

    /**
     * <!-- start generic documentation -->
     * Retrieves the result set holdability for <code>ResultSet</code> objects
     * generated by this <code>Statement</code> object. <p>
     * <!-- end generic documentation -->
     *
     * <!-- start release-specific documentation -->
     * <div class="ReleaseSpecificDocumentation">
     * <h3>HSQLDB-Specific Information:</h3> <p>
     *
     * Starting with 1.7.2, this method returns HOLD_CURSORS_OVER_COMMIT
     * </div>
     * <!-- end release-specific documentation -->
     *
     * @return either <code>ResultSet.HOLD_CURSORS_OVER_COMMIT</code> or
     *      <code>ResultSet.CLOSE_CURSORS_AT_COMMIT</code>
     * @exception SQLException if a database access error occurs
     * @since JDK 1.4, HSQLDB 1.7
     */
//#ifdef JDBC3
    public int getResultSetHoldability() throws SQLException {
        return jdbcResultSet.HOLD_CURSORS_OVER_COMMIT;
    }

//#endif JDBC3
    // -------------------- Internal Implementation ----------------------------

    /**
     * Constructs a new jdbcStatement with the specified connection and
     * result type.
     *
     * @param  c the connection on which this statement will execute
     * @param  type the kind of results this will return
     */
    jdbcStatement(jdbcConnection c, int type) {

        // PRE: assume connection is not null and is not closed
        // PRE: assume type is a valid result set type code
        connection = c;
        rsType     = type;
    }

    /**
     * Retrieves whether this statement is closed.
     */
    synchronized boolean isClosed() {
        return isClosed;
    }

    /**
     * An internal check for closed statements.
     *
     * @throws SQLException when the connection is closed
     */
    void checkClosed() throws SQLException {

        if (isClosed) {
            throw Util.sqlException(Trace.STATEMENT_IS_CLOSED);
        }

        if (connection.isClosed) {
            throw Util.sqlException(Trace.CONNECTION_IS_CLOSED);
        }
    }

    /**
     * Internal result producer for jdbcStatement (sqlExecDirect mode). <p>
     *
     * @param sql a character sequence representing the SQL to be executed
     * @throws SQLException when a database access error occurs
     */
    private void fetchResult(String sql) throws SQLException {

        if (isEscapeProcessing) {
            sql = connection.nativeSQL(sql);
        }

        resultIn = null;

        resultOut.setMainString(sql);
        resultOut.setMaxRows(maxRows);

        try {
            resultIn = connection.sessionProxy.execute(resultOut);

            if (resultIn.isError()) {
                throw new HsqlException(resultIn);
            }
        } catch (HsqlException e) {
            throw Util.sqlException(e);
        }
    }
}