org.teasoft.bee.osql.transaction

Enum TransactionIsolationLevel

java.lang.Object

java.lang.Enum<TransactionIsolationLevel>

org.teasoft.bee.osql.transaction.TransactionIsolationLevel

All Implemented Interfaces:

Serializable, Comparable<TransactionIsolationLevel>

public enum TransactionIsolationLevel
extends Enum<TransactionIsolationLevel>

Transaction isolation level.

Since:

1.0

Author:

Kingstar

Enum Constant Summary

Enum Constants

Enum Constant and Description
TRANSACTION_NONE A constant indicating that transactions are not supported.
TRANSACTION_READ_COMMITTED A constant indicating that dirty reads are prevented; non-repeatable reads and phantom reads can occur.
TRANSACTION_READ_UNCOMMITTED A constant indicating that dirty reads, non-repeatable reads and phantom reads can occur.
TRANSACTION_REPEATABLE_READ A constant indicating that dirty reads and non-repeatable reads are prevented; phantom reads can occur.
TRANSACTION_SERIALIZABLE A constant indicating that dirty reads, non-repeatable reads and phantom reads are prevented.

Method Summary

Modifier and Type	Method and Description
int	getLevel() get the value of TransactionIsolationLevel.
static TransactionIsolationLevel	valueOf(String name) Returns the enum constant of this type with the specified name.
static TransactionIsolationLevel[]	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

TRANSACTION_NONE

public static final TransactionIsolationLevel TRANSACTION_NONE

A constant indicating that transactions are not supported.

TRANSACTION_READ_UNCOMMITTED

public static final TransactionIsolationLevel TRANSACTION_READ_UNCOMMITTED

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.

TRANSACTION_READ_COMMITTED

public static final TransactionIsolationLevel TRANSACTION_READ_COMMITTED

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.

TRANSACTION_REPEATABLE_READ

public static final TransactionIsolationLevel TRANSACTION_REPEATABLE_READ

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").

TRANSACTION_SERIALIZABLE

public static final TransactionIsolationLevel TRANSACTION_SERIALIZABLE

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 TransactionIsolationLevel[] 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 (TransactionIsolationLevel c : TransactionIsolationLevel.values())
    System.out.println(c);

Returns:

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

valueOf

public static TransactionIsolationLevel 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

getLevel

public int getLevel()

get the value of TransactionIsolationLevel.

Returns:

value of TransactionIsolationLevel.