Package org.h2.engine

Enum NullsDistinct

java.lang.Object

java.lang.Enum<NullsDistinct>

org.h2.engine.NullsDistinct

All Implemented Interfaces:

java.io.Serializable, java.lang.Comparable<NullsDistinct>, HasSQL

public enum NullsDistinct
extends java.lang.Enum<NullsDistinct>
implements HasSQL

Determines how rows with NULL values in indexed columns are handled in unique indexes, unique constraints, or by unique predicate.

Enum Constant Summary

Enum Constants

Enum Constant	Description
ALL_DISTINCT	NULL values of columns are distinct only if all columns have null values.
DISTINCT	NULL values of columns are distinct.
NOT_DISTINCT	NULL values of columns are never distinct.

Field Summary

Fields inherited from interface org.h2.util.HasSQL

ADD_PLAN_INFORMATION, DEFAULT_SQL_FLAGS, NO_CASTS, QUOTE_ONLY_WHEN_REQUIRED, REPLACE_LOBS_FOR_TRACE, TRACE_SQL_FLAGS

Method Summary

Modifier and Type	Method	Description
java.lang.StringBuilder	getSQL(java.lang.StringBuilder builder, int sqlFlags)	Appends the SQL statement of this object to the specified builder.
static NullsDistinct	valueOf(java.lang.String name)	Returns the enum constant of this type with the specified name.
static NullsDistinct[]	values()	Returns an array containing the constants of this enum type, in the order they are declared.

Methods inherited from class java.lang.Enum

clone, compareTo, equals, finalize, getDeclaringClass, hashCode, name, ordinal, toString, valueOf

Methods inherited from class java.lang.Object

getClass, notify, notifyAll, wait, wait, wait

Methods inherited from interface org.h2.util.HasSQL

getSQL, getTraceSQL

Enum Constant Detail

DISTINCT

public static final NullsDistinct DISTINCT

NULL values of columns are distinct.

ALL_DISTINCT

public static final NullsDistinct ALL_DISTINCT

NULL values of columns are distinct only if all columns have null values.

NOT_DISTINCT

public static final NullsDistinct NOT_DISTINCT

NULL values of columns are never distinct.

Method Detail

values

public static NullsDistinct[] values()

Returns an array containing the constants of this enum type, in the order they are declared. This method may be used to iterate over the constants as follows:

for (NullsDistinct c : NullsDistinct.values())
    System.out.println(c);

Returns:

an array containing the constants of this enum type, in the order they are declared

valueOf

public static NullsDistinct valueOf(java.lang.String name)

Returns the enum constant of this type with the specified name. The string must match exactly an identifier used to declare an enum constant in this type. (Extraneous whitespace characters are not permitted.)

Parameters:

name - the name of the enum constant to be returned.

Returns:

the enum constant with the specified name

Throws:

java.lang.IllegalArgumentException - if this enum type has no constant with the specified name

java.lang.NullPointerException - if the argument is null

getSQL

public java.lang.StringBuilder getSQL(java.lang.StringBuilder builder,
                                      int sqlFlags)

Description copied from interface: HasSQL

Appends the SQL statement of this object to the specified builder.

Specified by:

getSQL in interface HasSQL

Parameters:

builder - string builder

sqlFlags - formatting flags

Returns:

the specified string builder