libjava/classpath/java/sql/ResultSetMetaData.java


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/* ResultSetMetaData.java -- Returns information about the ResultSet
   Copyright (C) 1999, 2000, 2002, 2006 Free Software Foundation, Inc.

This file is part of GNU Classpath.

GNU Classpath is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2, or (at your option)
any later version.
 
GNU Classpath is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
General Public License for more details.

You should have received a copy of the GNU General Public License
along with GNU Classpath; see the file COPYING.  If not, write to the
Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
02110-1301 USA.

Linking this library statically or dynamically with other modules is
making a combined work based on this library.  Thus, the terms and
conditions of the GNU General Public License cover the whole
combination.

As a special exception, the copyright holders of this library give you
permission to link this library with independent modules to produce an
executable, regardless of the license terms of these independent
modules, and to copy and distribute the resulting executable under
terms of your choice, provided that you also meet, for each linked
independent module, the terms and conditions of the license of that
module.  An independent module is a module which is not derived from
or based on this library.  If you modify this library, you may extend
this exception to your version of the library, but you are not
obligated to do so.  If you do not wish to do so, delete this
exception statement from your version. */


package java.sql;

/**
 * This interface provides a mechanism for obtaining information about
 * the columns that are present in a <code>ResultSet</code>.
 * 
 * <p> Note that in this class column indices start at 1, not 0.</p>
 *
 * @author Aaron M. Renn (arenn@urbanophile.com)
 */
public interface ResultSetMetaData 
{
  /**
   * The column does not allow NULL's.
   */
  int columnNoNulls = 0;

  /**
   * The column allows NULL's.
   */
  int columnNullable = 1;

  /**
   * It is unknown whether or not the column allows NULL's.
   */
  int columnNullableUnknown = 2;

  /**
   * This method returns the number of columns in the result set.
   *
   * @return The number of columns in the result set.
   * @exception SQLException If an error occurs.
   */
  int getColumnCount() throws SQLException;

  /**
   * This method test whether or not the column is an auto-increment column.
   * Auto-increment columns are read-only.
   *
   * @param columnIndex The index of the column to test.
   * @return <code>true</code> if the column is auto-increment, <code>false</code>
   *         otherwise.
   * @exception SQLException If an error occurs.
   */
  boolean isAutoIncrement(int columnIndex) throws SQLException;

  /**
   * This method tests whether or not a column is case sensitive in its values.
   *
   * @param columnIndex The index of the column to test.
   * @return <code>true</code> if the column value is case sensitive,
   *         <code>false</code> otherwise.
   * @exception SQLException If an error occurs.
   */
  boolean isCaseSensitive(int columnIndex) throws SQLException;

  /**
   * This method tests whether not the specified column can be used in 
   * a WHERE clause.
   *
   * @param columnIndex The index of the column to test.
   * @return <code>true</code> if the column may be used in a WHERE clause,
   *         <code>false</code> otherwise.
   * @exception SQLException If an error occurs.
   */
  boolean isSearchable(int columnIndex) throws SQLException;

  /**
   * This method tests whether or not the column stores a monetary value.
   *
   * @param columnIndex The index of the column to test.
   * @return <code>true</code> if the column contains a monetary value,
   *         <code>false</code> otherwise.
   * @exception SQLException If an error occurs.
   */
  boolean isCurrency(int columnIndex) throws SQLException;

  /**
   * This method returns a value indicating whether or not the specified
   * column may contain a NULL value.
   *
   * @param columnIndex The index of the column to test.
   * @return A constant indicating whether or not the column can contain NULL,
   *         which will be one of <code>columnNoNulls</code>,
   *         <code>columnNullable</code>, or <code>columnNullableUnknown</code>.
   * @exception SQLException If an error occurs.
   */
  int isNullable(int columnIndex) throws SQLException;

  /**
   * This method tests whether or not the value of the specified column
   * is signed or unsigned.
   *
   * @param columnIndex The index of the column to test.
   * @return <code>true</code> if the column value is signed, <code>false</code>
   *         otherwise.
   * @exception SQLException If an error occurs.
   */
  boolean isSigned(int columnIndex) throws SQLException;

  /**
   * This method returns the maximum number of characters that can be used
   * to display a value in this column.
   *
   * @param columnIndex The index of the column to check.
   * @return The maximum number of characters that can be used to display a
   *         value for this column.
   * @exception SQLException If an error occurs.
   */
  int getColumnDisplaySize(int columnIndex) throws SQLException;

  /**
   * This method returns a string that should be used as a caption for this
   * column for user display purposes.
   *
   * @param columnIndex The index of the column to check.
   * @return A display string for the column.
   * @exception SQLException If an error occurs.
   */
  String getColumnLabel(int columnIndex) throws SQLException;

  /**
   * This method returns the name of the specified column.
   *
   * @param columnIndex The index of the column to return the name of.
   * @return The name of the column.
   * @exception SQLException If an error occurs.
   */
  String getColumnName(int columnIndex) throws SQLException;

  /**
   * This method returns the name of the schema that contains the specified
   * column.
   *
   * @param columnIndex The index of the column to check the schema name for.
   * @return The name of the schema that contains the column.
   * @exception SQLException If an error occurs.
   */
  String getSchemaName(int columnIndex) throws SQLException;

  /**
   * This method returns the precision of the specified column, which is the
   * number of decimal digits it contains.
   *
   * @param columnIndex The index of the column to check the precision on.
   * @return The precision of the specified column.
   * @exception SQLException If an error occurs.
   */
  int getPrecision(int columnIndex) throws SQLException;

  /**
   * This method returns the scale of the specified column, which is the
   * number of digits to the right of the decimal point.
   *
   * @param columnIndex The index column to check the scale of.
   * @return The scale of the column.
   * @exception SQLException If an error occurs.
   */
  int getScale(int columnIndex) throws SQLException;

  /**
   * This method returns the name of the table containing the specified
   * column.
   *
   * @param columnIndex The index of the column to check the table name for.
   * @return The name of the table containing the column.
   * @exception SQLException If an error occurs.
   */
  String getTableName(int columnIndex) throws SQLException;

  /**
   * This method returns the name of the catalog containing the specified
   * column.
   *
   * @param columnIndex The index of the column to check the catalog name for.
   * @return The name of the catalog containing the column.
   * @exception SQLException If an error occurs.
   */
  String getCatalogName(int columnIndex) throws SQLException;

  /**
   * This method returns the SQL type of the specified column.  This will
   * be one of the constants from <code>Types</code>.
   *
   * @param columnIndex The index of the column to check the SQL type of.
   * @return The SQL type for this column.
   * @exception SQLException If an error occurs.
   * @see Types
   */
  int getColumnType(int columnIndex) throws SQLException;

  /**
   * This method returns the name of the SQL type for this column.
   *
   * @param columnIndex The index of the column to check the SQL type name for.
   * @return The name of the SQL type for this column.
   * @exception SQLException If an error occurs.
   */
  String getColumnTypeName(int columnIndex) throws SQLException;

  /**
   * This method tests whether or not the specified column is read only.
   *
   * @param columnIndex The index of the column to check.
   * @return <code>true</code> if the column is read only, <code>false</code>
   *         otherwise.
   * @exception SQLException If an error occurs.
   */
  boolean isReadOnly(int columnIndex) throws SQLException;

  /**
   * This method tests whether or not the column may be writable.  This
   * does not guarantee that a write will be successful.
   *
   * @param columnIndex The index of the column to check for writability.
   * @return <code>true</code> if the column may be writable,
   *         <code>false</code> otherwise.
   * @exception SQLException If an error occurs.
   */
  boolean isWritable(int columnIndex) throws SQLException;

  /**
   * This method tests whether or not the column is writable.  This
   * does guarantee that a write will be successful.
   *
   * @param columnIndex The index of the column to check for writability.
   * @return <code>true</code> if the column is writable,
   *         <code>false</code> otherwise.
   * @exception SQLException If an error occurs.
   */
  boolean isDefinitelyWritable(int columnIndex) throws SQLException;

  /**
   * This method returns the name of the Java class which will be used to
   * create objects representing the data in this column.
   *
   * @param columnIndex The index of the column to check.
   * @return The name of the Java class that will be used for values in
   *         this column.
   * @exception SQLException If an error occurs.
   */
  String getColumnClassName(int columnIndex) throws SQLException;
}
# This testcase is part of GDB, the GNU debugger.

# Copyright 2017-2020 Free Software Foundation, Inc.

# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.

# This test doesn't make sense on native-gdbserver.
if { [use_gdb_stub] } {
    untested "not supported"
    return
}

standard_testfile

if { [prepare_for_testing "failed to prepare" $testfile $srcfile debug] } {
    return -1
}

set test_var_name "GDB_TEST_VAR"

# Helper function that performs a check on the output of "getenv".
#
# - VAR_NAME is the name of the variable to be checked.
#
# - VAR_VALUE is the value expected.
#
# - TEST_MSG, if not empty, is the test message to be used by the
#   "gdb_test".
#
# - EMPTY_VAR_P, if non-zero, means that the variable is not expected
#   to exist.  In this case, VAR_VALUE is not considered.

proc check_getenv { var_name var_value { test_msg "" } { empty_var_p 0 } } {
    global hex decimal

    if { $test_msg == "" } {
	set test_msg "print result of getenv for $var_name"
    }

    if { $empty_var_p } {
	set var_value_match "0x0"
    } else {
	set var_value_match "$hex \"$var_value\""
    }

    gdb_test "print my_getenv (\"$var_name\")" "\\\$$decimal = $var_value_match" \
	$test_msg
}

# Helper function to re-run to main and breaking at the "break-here"
# label.

proc do_prepare_inferior { } {
    global decimal hex

    if { ![runto_main] } {
	return -1
    }

    gdb_breakpoint [gdb_get_line_number "break-here"]

    gdb_test "continue" "Breakpoint $decimal, main \\\(argc=1, argv=$hex\\\) at.*" \
	"continue until breakpoint"
}

# Helper function that does the actual testing.
#
# - VAR_VALUE is the value of the environment variable.
#
# - VAR_NAME is the name of the environment variable.  If empty,
#   defaults to $test_var_name.
#
# - VAR_NAME_MATCH is the name (regex) that will be used to query the
#   environment about the variable (via getenv).  This is useful when
#   we're testing variables with strange names (e.g., with an equal
#   sign in the name) and we know that the variable will actually be
#   set using another name.  If empty, defatults, to $var_name.
#
# - VAR_VALUE_MATCH is the value (regex) that will be used to match
#   the result of getenv.  The rationale is the same as explained for
#   VAR_NAME_MATCH.  If empty, defaults, to $var_value.

proc do_test { var_value { var_name "" } { var_name_match "" } { var_value_match "" } } {
    global binfile test_var_name

    clean_restart $binfile

    if { $var_name == "" } {
	set var_name $test_var_name
    }

    if { $var_name_match == "" } {
	set var_name_match $var_name
    }

    if { $var_value_match == "" } {
	set var_value_match $var_value
    }

    if { $var_value != "" } {
	gdb_test_no_output "set environment $var_name = $var_value" \
	    "set $var_name = $var_value"
    } else {
	gdb_test "set environment $var_name =" \
	    "Setting environment variable \"$var_name\" to null value." \
	    "set $var_name to null value"
    }

    do_prepare_inferior

    check_getenv "$var_name_match" "$var_value_match" \
	"print result of getenv for $var_name"
}

with_test_prefix "long var value" {
    do_test "this is my test variable; testing long vars; {}"
}

with_test_prefix "empty var" {
    do_test ""
}

with_test_prefix "strange named var" {
    # In this test we're doing the following:
    #
    #   (gdb) set environment 'asd =' = 123 43; asd b ### [];;;
    #
    # However, due to how GDB parses this line, the environment
    # variable will end up named <'asd> (without the <>), and its
    # value will be <' = 123 43; asd b ### [];;;> (without the <>).
    do_test "123 43; asd b ### \[\];;;" "'asd ='" "'asd" \
	[string_to_regexp "' = 123 43; asd b ### \[\];;;"]
}

# Test setting and unsetting environment variables in various
# fashions.

proc test_set_unset_vars { } {
    global binfile

    clean_restart $binfile

    with_test_prefix "set 3 environment variables" {
	# Set some environment variables
	gdb_test_no_output "set environment A = 1" \
	    "set A to 1"
	gdb_test_no_output "set environment B = 2" \
	    "set B to 2"
	gdb_test_no_output "set environment C = 3" \
	    "set C to 3"

	do_prepare_inferior

	# Check that the variables are known by the inferior
	check_getenv "A" "1"
	check_getenv "B" "2"
	check_getenv "C" "3"
    }

    with_test_prefix "unset one variable, reset one" {
	# Now, unset/reset some values
	gdb_test_no_output "unset environment A" \
	    "unset A"
	gdb_test_no_output "set environment B = 4" \
	    "set B to 4"

	do_prepare_inferior

	check_getenv "A" "" "" 1
	check_getenv "B" "4"
	check_getenv "C" "3"
    }

    with_test_prefix "unset two variables, reset one" {
	# Unset more values
	gdb_test_no_output "unset environment B" \
	    "unset B"
	gdb_test_no_output "set environment A = 1" \
	    "set A to 1 again"
	gdb_test_no_output "unset environment C" \
	    "unset C"

	do_prepare_inferior

	check_getenv "A" "1"
	check_getenv "B" "" "" 1
	check_getenv "C" "" "" 1
    }
}

with_test_prefix "test set/unset of vars" {
    test_set_unset_vars
}

# Test that unsetting works.

proc test_unset { } {
    global hex decimal binfile gdb_prompt

    clean_restart $binfile

    do_prepare_inferior

    set test_msg "check if unset works"
    set found_home 0
    gdb_test_multiple "print my_getenv (\"HOME\")" $test_msg {
	-re "\\\$$decimal = $hex \".*\"\r\n$gdb_prompt $" {
	    pass $test_msg
	    set found_home 1
	}
	-re "\\\$$decimal = 0x0\r\n$gdb_prompt $" {
	    untested $test_msg
	}
    }

    if { $found_home == 1 } {
	with_test_prefix "simple unset" {
	    # We can do the test, because $HOME exists (and therefore can
	    # be unset).
	    gdb_test_no_output "unset environment HOME" "unset HOME"

	    do_prepare_inferior

	    # $HOME now must be empty
	    check_getenv "HOME" "" "" 1
	}

	with_test_prefix "set-then-unset" {
	    clean_restart $binfile

	    # Test if setting and then unsetting $HOME works.
	    gdb_test_no_output "set environment HOME = test" "set HOME as test"
	    gdb_test_no_output "unset environment HOME" "unset HOME again"

	    do_prepare_inferior

	    check_getenv "HOME" "" "" 1
	}
    }
}

with_test_prefix "test unset of vars" {
    test_unset
}