jdbcdatabasemetadata.java

一个用java写的开源的数据库系统

     * <b>HSQLDB-Specific Information:</b> <p>
     *
     * HSQLDB sorts null low; this method always returns <code>false</code>.
     * </span>
     * <!-- end release-specific documentation -->
     *
     *
     * @return <code>true</code> if so; <code>false</code> otherwise
     * @exception SQLException if a database access error occurs
     */
    public boolean nullsAreSortedAtStart() throws SQLException {

        if (Trace.TRACE) {
            Trace.trace();
        }

        return false;
    }

    /**
     * Retrieves whether <code>NULL</code> values are sorted at the end regardless of
     * sort order. <p>
     *
     * <!-- start release-specific documentation -->
     * <span class="ReleaseSpecificDocumentation">
     * <b>HSQLDB-Specific Information:</b> <p>
     *
     * HSQLDB sorts null low; this method always returns <code>false</code>.
     * </span>
     * <!-- end release-specific documentation -->
     *
     *
     * @return <code>true</code> if so; <code>false</code> otherwise
     * @exception SQLException if a database access error occurs
     */
    public boolean nullsAreSortedAtEnd() throws SQLException {

        if (Trace.TRACE) {
            Trace.trace();
        }

        return false;
    }

    /**
     * Retrieves the name of this database product.
     *
     * @return database product name
     * @exception SQLException if a database access error occurs
     */
    public String getDatabaseProductName() throws SQLException {

        if (Trace.TRACE) {
            Trace.trace();
        }

        return jdbcDriver.PRODUCT;
    }

    /**
     * Retrieves the version number of this database product.
     *
     * @return database version number
     * @exception SQLException if a database access error occurs
     */
    public String getDatabaseProductVersion() throws SQLException {

        if (Trace.TRACE) {
            Trace.trace();
        }

        return jdbcDriver.VERSION;
    }

    /**
     * Retrieves the name of this JDBC driver.
     *
     * @return JDBC driver name
     * @exception SQLException if a database access error occurs
     */
    public String getDriverName() throws SQLException {

        if (Trace.TRACE) {
            Trace.trace();
        }

        return jdbcDriver.PRODUCT + " Driver";
    }

    /**
     * Retrieves the version number of this JDBC driver as a <code>String</code>.
     *
     * @return JDBC driver version
     * @exception SQLException if a database access error occurs
     */
    public String getDriverVersion() throws SQLException {

        if (Trace.TRACE) {
            Trace.trace();
        }

        return jdbcDriver.VERSION;
    }

    /**
     * Retrieves this JDBC driver's major version number.
     *
     * @return JDBC driver major version
     */
    public int getDriverMajorVersion() {

        if (Trace.TRACE) {
            Trace.trace();
        }

        return jdbcDriver.MAJOR;
    }

    /**
     * Retrieves this JDBC driver's minor version number.
     *
     * @return JDBC driver minor version number
     */
    public int getDriverMinorVersion() {

        if (Trace.TRACE) {
            Trace.trace();
        }

        return jdbcDriver.MINOR;
    }

    /**
     * Retrieves whether this database stores tables in a local file. <p>
     *
     * <!-- start release-specific documentation -->
     * <span class="ReleaseSpecificDocumentation">
     * <b>HSQLDB-Specific Information:</b> <p>
     *
     * Up to and including HSQLDB 1.7.1, do not rely on this information.
     * This will be resolved and explained more clearly in 1.7.2.
     * </span>
     * <!-- end release-specific documentation -->
     *
     *
     * @return <code>true</code> if so; <code>false</code> otherwise
     * @exception SQLException if a database access error occurs
     */
    public boolean usesLocalFiles() throws SQLException {

        if (Trace.TRACE) {
            Trace.trace();
        }

        // SEE: FIXME at jdbcConnection.usesLocalFiles()
        // boucherb@users 20020426
        return cConnection.usesLocalFiles();
    }

    /**
     * Retrieves whether this database uses a file for each table. <p>
     *
     * <!-- start release-specific documentation -->
     * <span class="ReleaseSpecificDocumentation">
     * <b>HSQLDB-Specific Information:</b> <p>
     *
     * Up to and including 1.7.1, HSQLDB never uses a file for each table.
     * This method always returns <code>false</code>.
     * </span>
     * <!-- end release-specific documentation -->
     *
     *
     * @return <code>true</code> if this database uses a local file for each table;
     *      <code>false</code> otherwise
     * @exception SQLException if a database access error occurs
     */
    public boolean usesLocalFilePerTable() throws SQLException {

        if (Trace.TRACE) {
            Trace.trace();
        }

        return false;
    }

    /**
     * Retrieves whether this database treats mixed case unquoted SQL identifiers as
     * case sensitive and as a result stores them in mixed case. <p>
     *
     * <!-- start release-specific documentation -->
     * <span class="ReleaseSpecificDocumentation">
     * <b>HSQLDB-Specific Information:</b> <p>
     *
     * HSQLDB treats unquoted identifiers as case insensitive and stores
     * them in upper case. It treats quoted identifiers as case sensitive and
     * stores them verbatim; this method always returns <code>false</code>.
     * </span>
     * <!-- end release-specific documentation -->
     *
     *
     * @return <code>true</code> if so; <code>false</code> otherwise
     * @exception SQLException if a database access error occurs
     */
    public boolean supportsMixedCaseIdentifiers() throws SQLException {

        if (Trace.TRACE) {
            Trace.trace();
        }

        return false;
    }

    /**
     * Retrieves whether this database treats mixed case unquoted SQL identifiers as
     * case insensitive and stores them in upper case. <p>
     *
     * <!-- start release-specific documentation -->
     * <span class="ReleaseSpecificDocumentation">
     * <b>HSQLDB-Specific Information:</b> <p>
     *
     * HSQLDB treats unquoted identifiers as case insensitive and stores
     * them in upper case. It treats quoted identifiers as case sensitive and
     * stores them verbatim; this method always returns <code>true</code>.
     * </span>
     * <!-- end release-specific documentation -->
     *
     *
     * @return <code>true</code> if so; <code>false</code> otherwise
     * @exception SQLException if a database access error occurs
     */
    public boolean storesUpperCaseIdentifiers() throws SQLException {

        if (Trace.TRACE) {
            Trace.trace();
        }

        return true;
    }

    /**
     * Retrieves whether this database treats mixed case unquoted SQL identifiers as
     * case insensitive and stores them in lower case. <p>
     *
     * <!-- start release-specific documentation -->
     * <span class="ReleaseSpecificDocumentation">
     * <b>HSQLDB-Specific Information:</b> <p>
     *
     * HSQLDB treats unquoted identifiers as case insensitive and stores
     * them in upper case. It treats quoted identifiers as case sensitive and
     * stores them verbatim; this method always returns <code>false</code>.
     * </span>
     * <!-- end release-specific documentation -->
     *
     *
     * @return <code>true</code> if so; <code>false</code> otherwise
     * @exception SQLException if a database access error occurs
     */
    public boolean storesLowerCaseIdentifiers() throws SQLException {

        if (Trace.TRACE) {
            Trace.trace();
        }

        return false;
    }

    /**
     * Retrieves whether this database treats mixed case unquoted SQL identifiers as
     * case insensitive and stores them in mixed case. <p>
     *
     * <!-- start release-specific documentation -->
     * <span class="ReleaseSpecificDocumentation">
     * <b>HSQLDB-Specific Information:</b> <p>
     *
     * HSQLDB treats unquoted identifiers as case insensitive and stores
     * them in upper case. It treats quoted identifiers as case sensitive and
     * stores them verbatim; this method always returns <code>false</code>.
     * </span>
     * <!-- end release-specific documentation -->
     *
     *
     * @return <code>true</code> if so; <code>false</code> otherwise
     * @exception SQLException if a database access error occurs
     */
    public boolean storesMixedCaseIdentifiers() throws SQLException {

        if (Trace.TRACE) {
            Trace.trace();
        }

        return false;
    }

    /**
     * Retrieves whether this database treats mixed case quoted SQL identifiers as
     * case sensitive and as a result stores them in mixed case. <p>
     *
     * <!-- start release-specific documentation -->
     * <span class="ReleaseSpecificDocumentation">
     * <b>HSQLDB-Specific Information:</b> <p>
     *
     * HSQLDB treats unquoted identifiers as case insensitive and stores
     * them in upper case. It treats quoted identifiers as case sensitive and
     * stores them verbatim; this method always returns <code>true</code>.
     * </span>
     * <!-- end release-specific documentation -->
     *
     *
     * @return <code>true</code> if so; <code>false</code> otherwise
     * @exception SQLException if a database access error occurs
     */
    public boolean supportsMixedCaseQuotedIdentifiers() throws SQLException {

        if (Trace.TRACE) {
            Trace.trace();
        }

        return true;

        // InterBase (iscdrv32.dll) returns false
    }

    /**
     * Retrieves whether this database treats mixed case quoted SQL identifiers as
     * case insensitive and stores them in upper case. <p>
     *
     * <!-- start release-specific documentation -->
     * <span class="ReleaseSpecificDocumentation">
     * <b>HSQLDB-Specific Information:</b> <p>
     *
     * HSQLDB treats unquoted identifiers as case insensitive and stores
     * them in upper case. It treats quoted identifiers as case sensitive and
     * stores them verbatim; this method always returns <code>false</code>.
     * </span>
     * <!-- end release-specific documentation -->
     *
     *
     * @return <code>true</code> if so; <code>false</code> otherwise
     * @exception SQLException if a database access error occurs
     */
    public boolean storesUpperCaseQuotedIdentifiers() throws SQLException {

        if (Trace.TRACE) {
            Trace.trace();
        }

        return false;
    }

    /**
     * Retrieves whether this database treats mixed case quoted SQL identifiers as
     * case insensitive and stores them in lower case. <p>
     *
     * <!-- start release-specific documentation -->
     * <span class="ReleaseSpecificDocumentation">
     * <b>HSQLDB-Specific Information:</b> <p>
     *
     * HSQLDB treats unquoted identifiers as case insensitive and stores
     * them in upper case. It treats quoted identifiers as case sensitive and
     * stores them verbatim; this method always returns <code>false</code>e.
     * </span>
     * <!-- end release-specific documentation -->
     *
     *
     * @return <code>true</code> if so; <code>false</code> otherwise
     * @exception SQLException if a database access error occurs
     */
    public boolean storesLowerCaseQuotedIdentifiers() throws SQLException {

        if (Trace.TRACE) {
            Trace.trace();
        }

        return false;
    }

    /**
     * Retrieves whether this database treats mixed case quoted SQL identifiers as
     * case insensitive and stores them in mixed case. <p>
     *
     * <!-- start release-specific documentation -->
     * <span class="ReleaseSpecificDocumentation">
     * <b>HSQLDB-Specific Information:</b> <p>
     *
     * HSQLDB treats unquoted identifiers as case insensitive and stores
     * them in upper case. It treats quoted identifiers as case sensitive and
     * stores them verbatim; this method always returns <code>false</code>.
     * </span>
     * <!-- end release-specific documentation -->