databasemetadata.java

java数据库源代码 请看看啊 提点宝贵的意见

     * @exception SQLException if a database access error occurs
     */
    String getCatalogSeparator() throws SQLException;

    /**
     * Retrieves whether a schema name can be used in a data manipulation statement.
     *
     * @return <code>true</code> if so; <code>false</code> otherwise
     * @exception SQLException if a database access error occurs
     */
    boolean supportsSchemasInDataManipulation() throws SQLException;

    /**
     * Retrieves whether a schema name can be used in a procedure call statement.
     *
     * @return <code>true</code> if so; <code>false</code> otherwise
     * @exception SQLException if a database access error occurs
     */
    boolean supportsSchemasInProcedureCalls() throws SQLException;

    /**
     * Retrieves whether a schema name can be used in a table definition statement.
     *
     * @return <code>true</code> if so; <code>false</code> otherwise
     * @exception SQLException if a database access error occurs
     */
    boolean supportsSchemasInTableDefinitions() throws SQLException;

    /**
     * Retrieves whether a schema name can be used in an index definition statement.
     *
     * @return <code>true</code> if so; <code>false</code> otherwise
     * @exception SQLException if a database access error occurs
     */
    boolean supportsSchemasInIndexDefinitions() throws SQLException;

    /**
     * Retrieves whether a schema name can be used in a privilege definition statement.
     *
     * @return <code>true</code> if so; <code>false</code> otherwise
     * @exception SQLException if a database access error occurs
     */
    boolean supportsSchemasInPrivilegeDefinitions() throws SQLException;

    /**
     * Retrieves whether a catalog name can be used in a data manipulation statement.
     *
     * @return <code>true</code> if so; <code>false</code> otherwise
     * @exception SQLException if a database access error occurs
     */
    boolean supportsCatalogsInDataManipulation() throws SQLException;

    /**
     * Retrieves whether a catalog name can be used in a procedure call statement.
     *
     * @return <code>true</code> if so; <code>false</code> otherwise
     * @exception SQLException if a database access error occurs
     */
    boolean supportsCatalogsInProcedureCalls() throws SQLException;

    /**
     * Retrieves whether a catalog name can be used in a table definition statement.
     *
     * @return <code>true</code> if so; <code>false</code> otherwise
     * @exception SQLException if a database access error occurs
     */
    boolean supportsCatalogsInTableDefinitions() throws SQLException;

    /**
     * Retrieves whether a catalog name can be used in an index definition statement.
     *
     * @return <code>true</code> if so; <code>false</code> otherwise
     * @exception SQLException if a database access error occurs
     */
    boolean supportsCatalogsInIndexDefinitions() throws SQLException;

    /**
     * Retrieves whether a catalog name can be used in a privilege definition statement.
     *
     * @return <code>true</code> if so; <code>false</code> otherwise
     * @exception SQLException if a database access error occurs
     */
    boolean supportsCatalogsInPrivilegeDefinitions() throws SQLException;


    /**
     * Retrieves whether this database supports positioned <code>DELETE</code>
     * statements.
     *
     * @return <code>true</code> if so; <code>false</code> otherwise
     * @exception SQLException if a database access error occurs
     */
    boolean supportsPositionedDelete() throws SQLException;

    /**
     * Retrieves whether this database supports positioned <code>UPDATE</code>
     * statements.
     *
     * @return <code>true</code> if so; <code>false</code> otherwise
     * @exception SQLException if a database access error occurs
     */
    boolean supportsPositionedUpdate() throws SQLException;

    /**
     * Retrieves whether this database supports <code>SELECT FOR UPDATE</code>
     * statements.
     *
     * @return <code>true</code> if so; <code>false</code> otherwise
     * @exception SQLException if a database access error occurs
     */
    boolean supportsSelectForUpdate() throws SQLException;

    /**
     * Retrieves whether this database supports stored procedure calls 
     * that use the stored procedure escape syntax.
     *
     * @return <code>true</code> if so; <code>false</code> otherwise 
     * @exception SQLException if a database access error occurs
     */
    boolean supportsStoredProcedures() throws SQLException;

    /**
     * Retrieves whether this database supports subqueries in comparison 
     * expressions.
     *
     * @return <code>true</code> if so; <code>false</code> otherwise
     * @exception SQLException if a database access error occurs
     */
    boolean supportsSubqueriesInComparisons() throws SQLException;

    /**
     * Retrieves whether this database supports subqueries in 
     * <code>EXISTS</code> expressions.
     *
     * @return <code>true</code> if so; <code>false</code> otherwise
     * @exception SQLException if a database access error occurs
     */
    boolean supportsSubqueriesInExists() throws SQLException;

    /**
     * Retrieves whether this database supports subqueries in 
     * <code>IN</code> statements.
     *
     * @return <code>true</code> if so; <code>false</code> otherwise
     * @exception SQLException if a database access error occurs
     */
    boolean supportsSubqueriesInIns() throws SQLException;

    /**
     * Retrieves whether this database supports subqueries in quantified 
     * expressions.
     *
     * @return <code>true</code> if so; <code>false</code> otherwise
     * @exception SQLException if a database access error occurs
     */
    boolean supportsSubqueriesInQuantifieds() throws SQLException;

    /**
     * Retrieves whether this database supports correlated subqueries.
     *
     * @return <code>true</code> if so; <code>false</code> otherwise
     * @exception SQLException if a database access error occurs
     */
    boolean supportsCorrelatedSubqueries() throws SQLException;

    /**
     * Retrieves whether this database supports SQL <code>UNION</code>.
     *
     * @return <code>true</code> if so; <code>false</code> otherwise
     * @exception SQLException if a database access error occurs
     */
    boolean supportsUnion() throws SQLException;

    /**
     * Retrieves whether this database supports SQL <code>UNION ALL</code>.
     *
     * @return <code>true</code> if so; <code>false</code> otherwise
     * @exception SQLException if a database access error occurs
     */
    boolean supportsUnionAll() throws SQLException;

    /**
     * Retrieves whether this database supports keeping cursors open 
     * across commits. 
     * 
     * @return <code>true</code> if cursors always remain open;
     *       <code>false</code> if they might not remain open
     * @exception SQLException if a database access error occurs
     */
    boolean supportsOpenCursorsAcrossCommit() throws SQLException;

    /**
     * Retrieves whether this database supports keeping cursors open 
     * across rollbacks.
     * 
     * @return <code>true</code> if cursors always remain open;
     *       <code>false</code> if they might not remain open
     * @exception SQLException if a database access error occurs
     */
    boolean supportsOpenCursorsAcrossRollback() throws SQLException;

    /**
     * Retrieves whether this database supports keeping statements open 
     * across commits.
     * 
     * @return <code>true</code> if statements always remain open;
     *       <code>false</code> if they might not remain open
     * @exception SQLException if a database access error occurs
     */
    boolean supportsOpenStatementsAcrossCommit() throws SQLException;

    /**
     * Retrieves whether this database supports keeping statements open 
     * across rollbacks.
     * 
     * @return <code>true</code> if statements always remain open;
     *       <code>false</code> if they might not remain open
     * @exception SQLException if a database access error occurs
     */
    boolean supportsOpenStatementsAcrossRollback() throws SQLException;

	

    //----------------------------------------------------------------------
    // The following group of methods exposes various limitations 
    // based on the target database with the current driver.
    // Unless otherwise specified, a result of zero means there is no
    // limit, or the limit is not known.
	
    /**
     * Retrieves the maximum number of hex characters this database allows in an 
     * inline binary literal.
     *
     * @return max the maximum length (in hex characters) for a binary literal;
     *      a result of zero means that there is no limit or the limit 
     *      is not known
     * @exception SQLException if a database access error occurs
     */
    int getMaxBinaryLiteralLength() throws SQLException;

    /**
     * Retrieves the maximum number of characters this database allows 
     * for a character literal.
     *
     * @return the maximum number of characters allowed for a character literal;
     *      a result of zero means that there is no limit or the limit is 
     *      not known
     * @exception SQLException if a database access error occurs
     */
    int getMaxCharLiteralLength() throws SQLException;

    /**
     * Retrieves the maximum number of characters this database allows
     * for a column name.
     *
     * @return the maximum number of characters allowed for a column name;
     *      a result of zero means that there is no limit or the limit 
     *      is not known
     * @exception SQLException if a database access error occurs
     */
    int getMaxColumnNameLength() throws SQLException;

    /**
     * Retrieves the maximum number of columns this database allows in a 
     * <code>GROUP BY</code> clause.
     *
     * @return the maximum number of columns allowed;
     *      a result of zero means that there is no limit or the limit 
     *      is not known
     * @exception SQLException if a database access error occurs
     */
    int getMaxColumnsInGroupBy() throws SQLException;

    /**
     * Retrieves the maximum number of columns this database allows in an index.
     *
     * @return the maximum number of columns allowed;
     *      a result of zero means that there is no limit or the limit 
     *      is not known
     * @exception SQLException if a database access error occurs
     */
    int getMaxColumnsInIndex() throws SQLException;

    /**
     * Retrieves the maximum number of columns this database allows in an 
     * <code>ORDER BY</code> clause.
     *
     * @return the maximum number of columns allowed;
     *      a result of zero means that there is no limit or the limit 
     *      is not known
     * @exception SQLException if a database access error occurs
     */
    int getMaxColumnsInOrderBy() throws SQLException;

    /**
     * Retrieves the maximum number of columns this database allows in a 
     * <code>SELECT</code> list.
     *
     * @return the maximum number of columns allowed;
     *      a result of zero means that there is no limit or the limit 
     *      is not known
     * @exception SQLException if a database access error occurs
     */
    int getMaxColumnsInSelect() throws SQLException;

    /**
     * Retrieves the maximum number of columns this database allows in a table.
     *
     * @return the maximum number of columns allowed;
     *      a result of zero means that there is no limit or the limit 
     *      is not known
     * @exception SQLException if a database access error occurs
     */
    int getMaxColumnsInTable() throws SQLException;

    /**
     * Retrieves the maximum number of concurrent connections to this
     * database that are possible.
     *
     * @return the maximum number of active connections possible at one time;
     *      a result of zero means that there is no limit or the limit 
     *      is not known
     * @exception SQLException if a database access error occurs
     */
    int getMaxConnections() throws SQLException;

    /**
     * Retrieves the maximum number of characters that this database allows in a
     * cursor name.