com.googlecode.jdbw
Enum TransactionIsolation

java.lang.Object
  java.lang.Enum<TransactionIsolation>
      com.googlecode.jdbw.TransactionIsolation

All Implemented Interfaces:

Serializable, Comparable<TransactionIsolation>

public enum TransactionIsolation
extends Enum<TransactionIsolation>

This enum contains the various levels of transactional isolation supported by JDBC. These values are all derived from constants on the java.sql.Connection class. For more information, please see wikipedia.

Author:

Martin Berglund

Enum Constant Summary

READ_COMMITTED
Taken from Java 6 API documentation: A constant indicating that dirty reads are prevented; non-repeatable reads and phantom reads can occur.

READ_UNCOMMITTED
Taken from Java 6 API documentation: A constant indicating that dirty reads, non-repeatable reads and phantom reads can occur.

REPEATABLE_READ
Taken from Java 6 API documentation: A constant indicating that dirty reads and non-repeatable reads are prevented; phantom reads can occur.

SERIALIZABLE
Taken from Java 6 API documentation: A constant indicating that dirty reads, non-repeatable reads and phantom reads are prevented.

Method Summary

static TransactionIsolation	fromLabel(String label)
static TransactionIsolation	fromLevel(int level)
int	getConstant()
String	toString()
static TransactionIsolation	valueOf(String name) Returns the enum constant of this type with the specified name.
static TransactionIsolation[]	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, valueOf

Methods inherited from class java.lang.Object

getClass, notify, notifyAll, wait, wait, wait

Enum Constant Detail

READ_COMMITTED

public static final TransactionIsolation READ_COMMITTED

Taken from Java 6 API documentation: A constant indicating that dirty reads are prevented; non-repeatable reads and phantom reads can occur. This level only prohibits a transaction from reading a row with uncommitted changes in it.

READ_UNCOMMITTED

public static final TransactionIsolation READ_UNCOMMITTED

Taken from Java 6 API documentation: A constant indicating that dirty reads, non-repeatable reads and phantom reads can occur. This level allows a row changed by one transaction to be read by another transaction before any changes in that row have been committed (a "dirty read"). If any of the changes are rolled back, the second transaction will have retrieved an invalid row.

REPEATABLE_READ

public static final TransactionIsolation REPEATABLE_READ

Taken from Java 6 API documentation: A constant indicating that dirty reads and non-repeatable reads are prevented; phantom reads can occur. This level prohibits a transaction from reading a row with uncommitted changes in it, and it also prohibits the situation where one transaction reads a row, a second transaction alters the row, and the first transaction rereads the row, getting different values the second time (a "non-repeatable read").

SERIALIZABLE

public static final TransactionIsolation SERIALIZABLE

Taken from Java 6 API documentation: A constant indicating that dirty reads, non-repeatable reads and phantom reads are prevented. This level includes the prohibitions in TRANSACTION_REPEATABLE_READ and further prohibits the situation where one transaction reads all rows that satisfy a WHERE condition, a second transaction inserts a row that satisfies that WHERE condition, and the first transaction rereads for the same condition, retrieving the additional "phantom" row in the second read.

Method Detail

values

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

Returns:

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

valueOf

public static TransactionIsolation 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

getConstant

public int getConstant()

toString

public String toString()

Overrides:

toString in class Enum<TransactionIsolation>

fromLabel

public static TransactionIsolation fromLabel(String label)

fromLevel

public static TransactionIsolation fromLevel(int level)