Package org.h2.engine

Enum NullsDistinct

  • All Implemented Interfaces:
    java.io.Serializable, java.lang.Comparable<NullsDistinct>, org.h2.util.HasSQL
    public enum NullsDistinct
extends java.lang.Enum<NullsDistinct>
implements org.h2.util.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

      All Methods Static Methods Instance Methods Concrete Methods 
      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: org.h2.util.HasSQL
        Appends the SQL statement of this object to the specified builder.
        Specified by:
        getSQL in interface org.h2.util.HasSQL
        Parameters:
        builder - string builder
        sqlFlags - formatting flags
        Returns:
        the specified string builder