mirror of git://gcc.gnu.org/git/gcc.git
379 lines
11 KiB
Java
379 lines
11 KiB
Java
/* ResultSetMetaData.java -- Returns information about the ResultSet
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Copyright (C) 1999, 2000 Free Software Foundation, Inc.
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This file is part of GNU Classpath.
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GNU Classpath is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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GNU Classpath is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GNU Classpath; see the file COPYING. If not, write to the
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Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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02111-1307 USA.
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As a special exception, if you link this library with other files to
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produce an executable, this library does not by itself cause the
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resulting executable to be covered by the GNU General Public License.
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This exception does not however invalidate any other reasons why the
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executable file might be covered by the GNU General Public License. */
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package java.sql;
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/**
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* This interface provides a mechanism for obtaining information about
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* the columns that are present in a <code>ResultSet</code>.
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* <p>
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* Note that in this class column indexes start at 1, not 0.
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*
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* @author Aaron M. Renn (arenn@urbanophile.com)
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*/
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public interface ResultSetMetaData
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{
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/**
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* The column does not allow NULL's.
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*/
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public static final int columnNoNulls = 0;
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/**
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* The column allows NULL's.
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*/
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public static final int columnNullable = 1;
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/**
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* It is unknown whether or not the column allows NULL's.
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*/
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public static final int columnNullableUnknown = 2;
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/*************************************************************************/
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/**
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* This method returns the number of columns in the result set.
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*
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* @return The number of columns in the result set.
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*
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* @exception SQLException If an error occurs.
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*/
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public abstract int
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getColumnCount() throws SQLException;
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/*************************************************************************/
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/**
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* This method test whether or not the column is an auto-increment column.
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* Auto-increment columns are read-only.
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*
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* @param index The index of the column to test.
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*
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* @return <code>true</code> if the column is auto-increment, <code>false</code>
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* otherwise.
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*
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* @exception SQLException If an error occurs.
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*/
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public abstract boolean
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isAutoIncrement(int index) throws SQLException;
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/*************************************************************************/
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/**
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* This method tests whether or not a column is case sensitive in its values.
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*
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* @param index The index of the column to test.
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*
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* @return <code>true</code> if the column value is case sensitive,
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* <code>false</code> otherwise.
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*
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* @exception SQLException If an error occurs.
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*/
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public abstract boolean
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isCaseSensitive(int index) throws SQLException;
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/*************************************************************************/
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/**
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* This method tests whether not the specified column can be used in
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* a WHERE clause.
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*
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* @param index The index of the column to test.
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*
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* @return <code>true</code> if the column may be used in a WHERE clause,
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* <code>false</code> otherwise.
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*
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* @exception SQLException If an error occurs.
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*/
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public abstract boolean
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isSearchable(int index) throws SQLException;
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/*************************************************************************/
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/**
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* This method tests whether or not the column stores a monetary value.
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*
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* @param index The index of the column to test.
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*
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* @return <code>true</code> if the column contains a monetary value,
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* <code>false</code> otherwise.
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*
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* @exception SQLException If an error occurs.
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*/
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public abstract boolean
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isCurrency(int index) throws SQLException;
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/*************************************************************************/
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/**
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* This method returns a value indicating whether or not the specified
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* column may contain a NULL value.
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*
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* @param index The index of the column to test.
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*
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* @return A constant indicating whether or not the column can contain NULL,
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* which will be one of <code>columnNoNulls</code>,
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* <code>columnNullable</code>, or <code>columnNullableUnknown</code>.
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*
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* @exception SQLException If an error occurs.
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*/
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public abstract int
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isNullable(int index) throws SQLException;
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/*************************************************************************/
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/**
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* This method tests whether or not the value of the specified column
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* is signed or unsigned.
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*
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* @param index The index of the column to test.
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*
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* @return <code>true</code> if the column value is signed, <code>false</code>
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* otherwise.
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*
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* @exception SQLException If an error occurs.
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*/
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public abstract boolean
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isSigned(int index) throws SQLException;
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/*************************************************************************/
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/**
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* This method returns the maximum number of characters that can be used
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* to display a value in this column.
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*
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* @param index The index of the column to check.
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*
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* @return The maximum number of characters that can be used to display a
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* value for this column.
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*
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* @exception SQLException If an error occurs.
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*/
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public abstract int
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getColumnDisplaySize(int index) throws SQLException;
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/*************************************************************************/
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/**
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* This method returns a string that should be used as a caption for this
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* column for user display purposes.
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*
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* @param index The index of the column to check.
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*
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* @return A display string for the column.
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*
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* @exception SQLException If an error occurs.
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*/
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public abstract String
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getColumnLabel(int index) throws SQLException;
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/*************************************************************************/
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/**
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* This method returns the name of the specified column.
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*
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* @param index The index of the column to return the name of.
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*
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* @return The name of the column.
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*
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* @exception SQLException If an error occurs.
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*/
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public abstract String
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getColumnName(int index) throws SQLException;
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/*************************************************************************/
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/**
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* This method returns the name of the schema that contains the specified
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* column.
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*
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* @param index The index of the column to check the schema name for.
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*
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* @return The name of the schema that contains the column.
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*
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* @exception SQLException If an error occurs.
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*/
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public abstract String
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getSchemaName(int index) throws SQLException;
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/*************************************************************************/
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/**
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* This method returns the precision of the specified column, which is the
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* number of decimal digits it contains.
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*
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* @param index The index of the column to check the precision on.
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*
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* @return The precision of the specified column.
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*
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* @exception SQLException If an error occurs.
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*/
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public abstract int
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getPrecision(int index) throws SQLException;
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/*************************************************************************/
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/**
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* This method returns the scale of the specified column, which is the
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* number of digits to the right of the decimal point.
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*
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* @param index The index column to check the scale of.
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*
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* @return The scale of the column.
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*
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* @exception SQLException If an error occurs.
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*/
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public abstract int
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getScale(int index) throws SQLException;
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/*************************************************************************/
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/**
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* This method returns the name of the table containing the specified
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* column.
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*
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* @param index The index of the column to check the table name for.
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*
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* @return The name of the table containing the column.
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*
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* @exception SQLException If an error occurs.
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*/
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public abstract String
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getTableName(int index) throws SQLException;
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/*************************************************************************/
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/**
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* This method returns the name of the catalog containing the specified
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* column.
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*
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* @param index The index of the column to check the catalog name for.
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*
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* @return The name of the catalog containing the column.
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*
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* @exception SQLException If an error occurs.
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*/
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public abstract String
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getCatalogName(int index) throws SQLException;
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/*************************************************************************/
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/**
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* This method returns the SQL type of the specified column. This will
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* be one of the constants from <code>Types</code>.
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*
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* @param index The index of the column to check the SQL type of.
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*
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* @return The SQL type for this column.
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*
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* @exception SQLException If an error occurs.
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*
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* @see Types
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*/
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public abstract int
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getColumnType(int index) throws SQLException;
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/*************************************************************************/
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/**
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* This method returns the name of the SQL type for this column.
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*
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* @param index The index of the column to check the SQL type name for.
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*
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* @return The name of the SQL type for this column.
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*
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* @exception SQLException If an error occurs.
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*/
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public abstract String
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getColumnTypeName(int index) throws SQLException;
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/*************************************************************************/
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/**
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* This method tests whether or not the specified column is read only.
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*
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* @param index The index of the column to check.
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*
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* @return <code>true</code> if the column is read only, <code>false</code>
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* otherwise.
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*
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* @exception SQLException If an error occurs.
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*/
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public abstract boolean
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isReadOnly(int index) throws SQLException;
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/*************************************************************************/
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/**
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* This method tests whether or not the column may be writable. This
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* does not guarantee that a write will be successful.
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*
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* @param index The index of the column to check for writability.
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*
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* @return <code>true</code> if the column may be writable,
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* <code>false</code> otherwise.
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*
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* @exception SQLException If an error occurs.
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*/
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public abstract boolean
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isWritable(int index) throws SQLException;
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/*************************************************************************/
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/**
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* This method tests whether or not the column is writable. This
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* does guarantee that a write will be successful.
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*
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* @param index The index of the column to check for writability.
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*
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* @return <code>true</code> if the column is writable,
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* <code>false</code> otherwise.
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*
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* @exception SQLException If an error occurs.
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*/
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public abstract boolean
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isDefinitelyWritable(int index) throws SQLException;
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/*************************************************************************/
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/**
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* This method returns the name of the Java class which will be used to
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* create objects representing the data in this column.
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*
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* @param index The index of the column to check.
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*
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* @return The name of the Java class that will be used for values in
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* this column.
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*
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* @exception SQLException If an error occurs.
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*/
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public abstract String
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getColumnClassName(int index) throws SQLException;
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} // interface ResultSetMetaData
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