databasemetadata.java

一个JDBC数据库连接的组件

     * @see #getSearchStringEscape 
     */
	ResultSet getProcedures(String catalog, String schemaPattern,
			String procedureNamePattern) throws SQLException;

    /**
     * PROCEDURE_TYPE - May return a result.
     */
	int procedureResultUnknown	= 0;
    /**
     * PROCEDURE_TYPE - Does not return a result.
     */
	int procedureNoResult		= 1;
    /**
     * PROCEDURE_TYPE - Returns a result.
     */
	int procedureReturnsResult	= 2;

    /**
     * Get a description of a catalog's stored procedure parameters
     * and result columns.
     *
     * <P>Only descriptions matching the schema, procedure and
     * parameter name criteria are returned.  They are ordered by
     * PROCEDURE_SCHEM and PROCEDURE_NAME. Within this, the return value,
     * if any, is first. Next are the parameter descriptions in call
     * order. The column descriptions follow in column number order.
     *
     * <P>Each row in the ResultSet is a parameter description or
     * column description with the following fields:
     *  <OL>
     *	<LI><B>PROCEDURE_CAT</B> String => procedure catalog (may be null)
     *	<LI><B>PROCEDURE_SCHEM</B> String => procedure schema (may be null)
     *	<LI><B>PROCEDURE_NAME</B> String => procedure name
     *	<LI><B>COLUMN_NAME</B> String => column/parameter name 
     *	<LI><B>COLUMN_TYPE</B> Short => kind of column/parameter:
     *      <UL>
     *      <LI> procedureColumnUnknown - nobody knows
     *      <LI> procedureColumnIn - IN parameter
     *      <LI> procedureColumnInOut - INOUT parameter
     *      <LI> procedureColumnOut - OUT parameter
     *      <LI> procedureColumnReturn - procedure return value
     *      <LI> procedureColumnResult - result column in ResultSet
     *      </UL>
     *  <LI><B>DATA_TYPE</B> short => SQL type from java.sql.Types
     *	<LI><B>TYPE_NAME</B> String => SQL type name, for a UDT type the
     *  type name is fully qualified
     *	<LI><B>PRECISION</B> int => precision
     *	<LI><B>LENGTH</B> int => length in bytes of data
     *	<LI><B>SCALE</B> short => scale
     *	<LI><B>RADIX</B> short => radix
     *	<LI><B>NULLABLE</B> short => can it contain NULL?
     *      <UL>
     *      <LI> procedureNoNulls - does not allow NULL values
     *      <LI> procedureNullable - allows NULL values
     *      <LI> procedureNullableUnknown - nullability unknown
     *      </UL>
     *	<LI><B>REMARKS</B> String => comment describing parameter/column
     *  </OL>
     *
     * <P><B>Note:</B> Some databases may not return the column
     * descriptions for a procedure. Additional columns beyond
     * REMARKS can be defined by the database.
     *
     * @param catalog a catalog name; "" retrieves those without a
     * catalog; null means drop catalog name from the selection criteria
     * @param schemaPattern a schema name pattern; "" retrieves those
     * without a schema 
     * @param procedureNamePattern a procedure name pattern 
     * @param columnNamePattern a column name pattern 
     * @return ResultSet - each row is a stored procedure parameter or 
     *      column description 
     * @exception SQLException if a database-access error occurs.
     * @see #getSearchStringEscape 
     */
	ResultSet getProcedureColumns(String catalog,
			String schemaPattern,
			String procedureNamePattern, 
			String columnNamePattern) throws SQLException;

    /**
     * COLUMN_TYPE - nobody knows.
     */
	int procedureColumnUnknown = 0;

    /**
     * COLUMN_TYPE - IN parameter.
     */
	int procedureColumnIn = 1;

    /**
     * COLUMN_TYPE - INOUT parameter.
     */
	int procedureColumnInOut = 2;

    /**
     * COLUMN_TYPE - OUT parameter.
     */
	int procedureColumnOut = 4;
    /**
     * COLUMN_TYPE - procedure return value.
     */
	int procedureColumnReturn = 5;

    /**
     * COLUMN_TYPE - result column in ResultSet.
     */
	int procedureColumnResult = 3;

    /**
     * TYPE NULLABLE - does not allow NULL values.
     */
    int procedureNoNulls = 0;

    /**
     * TYPE NULLABLE - allows NULL values.
     */
    int procedureNullable = 1;

    /**
     * TYPE NULLABLE - nullability unknown.
     */
    int procedureNullableUnknown = 2;


    /**
     * Get a description of tables available in a catalog.
     *
     * <P>Only table descriptions matching the catalog, schema, table
     * name and type criteria are returned.  They are ordered by
     * TABLE_TYPE, TABLE_SCHEM and TABLE_NAME.
     *
     * <P>Each table description has the following columns:
     *  <OL>
     *	<LI><B>TABLE_CAT</B> String => table catalog (may be null)
     *	<LI><B>TABLE_SCHEM</B> String => table schema (may be null)
     *	<LI><B>TABLE_NAME</B> String => table name
     *	<LI><B>TABLE_TYPE</B> String => table type.  Typical types are "TABLE",
     *			"VIEW",	"SYSTEM TABLE", "GLOBAL TEMPORARY", 
     *			"LOCAL TEMPORARY", "ALIAS", "SYNONYM".
     *	<LI><B>REMARKS</B> String => explanatory comment on the table
     *  </OL>
     *
     * <P><B>Note:</B> Some databases may not return information for
     * all tables.
     *
     * @param catalog a catalog name; "" retrieves those without a
     * catalog; null means drop catalog name from the selection criteria
     * @param schemaPattern a schema name pattern; "" retrieves those
     * without a schema
     * @param tableNamePattern a table name pattern 
     * @param types a list of table types to include; null returns all types 
     * @return ResultSet - each row is a table description
     * @exception SQLException if a database-access error occurs.
     * @see #getSearchStringEscape 
     */
	ResultSet getTables(String catalog, String schemaPattern,
		String tableNamePattern, String types[]) throws SQLException;

    /**
     * Get the schema names available in this database.  The results
     * are ordered by schema name.
     *
     * <P>The schema column is:
     *  <OL>
     *	<LI><B>TABLE_SCHEM</B> String => schema name
     *  </OL>
     *
     * @return ResultSet - each row has a single String column that is a
     * schema name 
     * @exception SQLException if a database-access error occurs.
     */
	ResultSet getSchemas() throws SQLException;

    /**
     * Get the catalog names available in this database.  The results
     * are ordered by catalog name.
     *
     * <P>The catalog column is:
     *  <OL>
     *	<LI><B>TABLE_CAT</B> String => catalog name
     *  </OL>
     *
     * @return ResultSet - each row has a single String column that is a
     * catalog name 
     * @exception SQLException if a database-access error occurs.
     */
	ResultSet getCatalogs() throws SQLException;

    /**
     * Get the table types available in this database.  The results
     * are ordered by table type.
     *
     * <P>The table type is:
     *  <OL>
     *	<LI><B>TABLE_TYPE</B> String => table type.  Typical types are "TABLE",
     *			"VIEW",	"SYSTEM TABLE", "GLOBAL TEMPORARY", 
     *			"LOCAL TEMPORARY", "ALIAS", "SYNONYM".
     *  </OL>
     *
     * @return ResultSet - each row has a single String column that is a
     * table type 
     * @exception SQLException if a database-access error occurs.
     */
	ResultSet getTableTypes() throws SQLException;

    /**
     * Get a description of table columns available in a catalog.
     *
     * <P>Only column descriptions matching the catalog, schema, table
     * and column name criteria are returned.  They are ordered by
     * TABLE_SCHEM, TABLE_NAME and ORDINAL_POSITION.
     *
     * <P>Each column description has the following columns:
     *  <OL>
     *	<LI><B>TABLE_CAT</B> String => table catalog (may be null)
     *	<LI><B>TABLE_SCHEM</B> String => table schema (may be null)
     *	<LI><B>TABLE_NAME</B> String => table name
     *	<LI><B>COLUMN_NAME</B> String => column name
     *	<LI><B>DATA_TYPE</B> short => SQL type from java.sql.Types
     *	<LI><B>TYPE_NAME</B> String => Data source dependent type name,
     *  for a UDT the type name is fully qualified
     *	<LI><B>COLUMN_SIZE</B> int => column size.  For char or date
     *	    types this is the maximum number of characters, for numeric or
     *	    decimal types this is precision.
     *	<LI><B>BUFFER_LENGTH</B> is not used.
     *	<LI><B>DECIMAL_DIGITS</B> int => the number of fractional digits
     *	<LI><B>NUM_PREC_RADIX</B> int => Radix (typically either 10 or 2)
     *	<LI><B>NULLABLE</B> int => is NULL allowed?
     *      <UL>
     *      <LI> columnNoNulls - might not allow NULL values
     *      <LI> columnNullable - definitely allows NULL values
     *      <LI> columnNullableUnknown - nullability unknown
     *      </UL>
     *	<LI><B>REMARKS</B> String => comment describing column (may be null)
     * 	<LI><B>COLUMN_DEF</B> String => default value (may be null)
     *	<LI><B>SQL_DATA_TYPE</B> int => unused
     *	<LI><B>SQL_DATETIME_SUB</B> int => unused
     *	<LI><B>CHAR_OCTET_LENGTH</B> int => for char types the 
     *       maximum number of bytes in the column
     *	<LI><B>ORDINAL_POSITION</B> int	=> index of column in table 
     *      (starting at 1)
     *	<LI><B>IS_NULLABLE</B> String => "NO" means column definitely 
     *      does not allow NULL values; "YES" means the column might 
     *      allow NULL values.  An empty string means nobody knows.
     *  </OL>
     *
     * @param catalog a catalog name; "" retrieves those without a
     * catalog; null means drop catalog name from the selection criteria
     * @param schemaPattern a schema name pattern; "" retrieves those
     * without a schema
     * @param tableNamePattern a table name pattern 
     * @param columnNamePattern a column name pattern 
     * @return ResultSet - each row is a column description
     * @exception SQLException if a database-access error occurs.
     * @see #getSearchStringEscape 
     */
	ResultSet getColumns(String catalog, String schemaPattern,
		String tableNamePattern, String columnNamePattern)
					throws SQLException;
    /**
     * COLUMN NULLABLE - might not allow NULL values.
     */
    int columnNoNulls = 0;

    /**
     * COLUMN NULLABLE - definitely allows NULL values.
     */
    int columnNullable = 1;

    /**
     * COLUMN NULLABLE - nullability unknown.
     */
    int columnNullableUnknown = 2;

    /**
     * Get a description of the access rights for a table's columns.
     *
     * <P>Only privileges matching the column name criteria are
     * returned.  They are ordered by COLUMN_NAME and PRIVILEGE.
     *
     * <P>Each privilige description has the following columns:
     *  <OL>
     *	<LI><B>TABLE_CAT</B> String => table catalog (may be null)
     *	<LI><B>TABLE_SCHEM</B> String => table schema (may be null)
     *	<LI><B>TABLE_NAME</B> String => table name
     *	<LI><B>COLUMN_NAME</B> String => column name
     *	<LI><B>GRANTOR</B> => grantor of access (may be null)
     *	<LI><B>GRANTEE</B> String => grantee of access
     *	<LI><B>PRIVILEGE</B> String => name of access (SELECT, 
     *      INSERT, UPDATE, REFRENCES, ...)
     *	<LI><B>IS_GRANTABLE</B> String => "YES" if grantee is permitted 
     *      to grant to others; "NO" if not; null if unknown 
     *  </OL>
     *
     * @param catalog a catalog name; "" retrieves those without a
     * catalog; null means drop catalog name from the selection criteria
     * @param schema a schema name; "" retrieves those without a schema
     * @param table a table name
     * @param columnNamePattern a column name pattern 
     * @return ResultSet - each row is a column privilege description
     * @exception SQLException if a database-access error occurs.
     * @see #getSearchStringEscape 
     */
	ResultSet getColumnPrivileges(String catalog, String schema,
		String table, String columnNamePattern) throws SQLException;

    /**
     * Get a description of the access rights for each table available
     * in a catalog. Note that a table privilege applies to one or
     * more columns in the table. It would be wrong to assume that
     * this priviledge applies to all columns (this may be true for
     * some systems but is not true for all.)
     *
     * <P>Only privileges matching the schema and table name
     * criteria are returned.  They are ordered by TABLE_SCHEM,
     * TABLE_NAME, and PRIVILEGE.
     *
     * <P>Each privilige description has the following columns:
     *  <OL>
     *	<LI><B>TABLE_CAT</B> String => table catalog (may be null)
     *	<LI><B>TABLE_SCHEM</B> String => table schema (may be null)
     *	<LI><B>TABLE_NAME</B> String => table name
     *	<LI><B>GRANTOR</B> => grantor of access (may be null)
     *	<LI><B>GRANTEE</B> String => grantee of access
     *	<LI><B>PRIVILEGE</B> String => name of access (SELECT, 
     *      INSERT, UPDATE, REFRENCES, ...)
     *	<LI><B>IS_GRANTABLE</B> String => "YES" if grantee is permitted 
     *      to grant to others; "NO" if not; null if unknown 
     *  </OL>
     *
     * @param catalog a catalog name; "" retrieves those without a
     * catalog; null means drop catalog name from the selection criteria
     * @param schemaPattern a schema name pattern; "" retrieves those
     * without a schema
     * @param tableNamePattern a table name pattern 
     * @return ResultSet - each row is a table privilege description
     * @exception SQLException if a database-access error occurs.
     * @see #getSearchStringEscape 
     */
	ResultSet getTablePrivileges(String catalog, String schemaPattern,
				String tableNamePattern) throws SQLException;

    /**
     * Get a description of a table's optimal set of columns that
     * uniquely identifies a row. They are ordered by SCOPE.
     *
     * <P>Each column description has the following columns:
     *  <OL>
     *	<LI><B>SCOPE</B> short => actual scope of result
     *      <UL>
     *      <LI> bestRowTemporary - very temporary, while using row
     *      <LI> bestRowTransaction - valid for remainder of current transaction
     *      <LI> bestRowSession - valid for remainder of current session
     *      </UL>
     *	<LI><B>COLUMN_NAME</B> String => column name
     *	<LI><B>DATA_TYPE</B> short => SQL data type from java.sql.Types
     *	<LI><B>TYPE_NAME</B> String => Data source dependent type name,
     *  for a UDT the type name is fully qualified
     *	<LI><B>COLUMN_SIZE</B> int => precision
     *	<LI><B>BUFFER_LENGTH</B> int => not used
     *	<LI><B>DECIMAL_DIGITS</B> short	 => scale
     *	<LI><B>PSEUDO_COLUMN</B> short => is this a pseudo column 
     *      like an Oracle ROWID
     *      <UL>
     *      <LI> bestRowUnknown - may or may not be pseudo column
     *      <LI> bestRowNotPseudo - is NOT a pseudo column
     *      <LI> bestRowPseudo - is a pseudo column
     *      </UL>
     *  </OL>