com.abubusoft.kripton.android

Enum ColumnType

java.lang.Object

java.lang.Enum<ColumnType>

com.abubusoft.kripton.android.ColumnType

All Implemented Interfaces:

Serializable, Comparable<ColumnType>

public enum ColumnType
extends Enum<ColumnType>

Enum Constant Summary

Enum Constants

Enum Constant and Description
INDEXED Indexes are special lookup tables that the database search engine can use to speed up data retrieval.
PRIMARY_KEY
STANDARD
UNIQUE

Method Summary

Modifier and Type	Method and Description
static ColumnType	valueOf(String name) Returns the enum constant of this type with the specified name.
static ColumnType[]	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

Enum Constant Detail

PRIMARY_KEY

public static final ColumnType PRIMARY_KEY

UNIQUE

public static final ColumnType UNIQUE

STANDARD

public static final ColumnType STANDARD

INDEXED

public static final ColumnType INDEXED

Indexes are special lookup tables that the database search engine can use to speed up data retrieval. Simply put, an index is a pointer to data in a table. An index in a database is very similar to an index in the back of a book.

For example, if you want to reference all pages in a book that discuss a certain topic, you first refer to the index, which lists all topics alphabetically and are then referred to one or more specific page numbers.

An index helps speed up SELECT queries and WHERE clauses, but it slows down data input, with UPDATE and INSERT statements. Indexes can be created or dropped with no effect on the data.

Creating an index involves the CREATE INDEX statement, which allows you to name the index, to specify the table and which column or columns to index, and to indicate whether the index is in ascending or descending order.

Indexes can also be unique, similar to the UNIQUE constraint, in that the index prevents duplicate entries in the column or combination of columns on which there's an index.

See here for full documentation.

Method Detail

values

public static ColumnType[] 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 (ColumnType c : ColumnType.values())
    System.out.println(c);

Returns:

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

valueOf

public static ColumnType valueOf(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:

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

NullPointerException - if the argument is null