Module io.helidon.data.sql.datasource
Package io.helidon.data.sql.datasource

Enum Class TransactionIsolation

java.lang.Object
java.lang.Enum<TransactionIsolation>
io.helidon.data.sql.datasource.TransactionIsolation
All Implemented Interfaces:
Serializable, Comparable<TransactionIsolation>, Constable
public enum TransactionIsolation extends Enum<TransactionIsolation>
Supported transaction isolation levels.

Documentation is copied from Connection.

  • Enum Constant Details

    • TRANSACTION_READ_UNCOMMITTED

      public static final TransactionIsolation 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 TransactionIsolation 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 TransactionIsolation 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 TransactionIsolation 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 Details

    • values

      public static TransactionIsolation[] values()
      Returns an array containing the constants of this enum class, in the order they are declared.
      Returns:
      an array containing the constants of this enum class, in the order they are declared

    • valueOf

      public static TransactionIsolation valueOf(String name)
      Returns the enum constant of this class with the specified name. The string must match exactly an identifier used to declare an enum constant in this class. (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 class has no constant with the specified name
      NullPointerException - if the argument is null

    • level

      public int level()
      Level as defined by constants on Connection.
      Returns:
      level to be used with Connection.setTransactionIsolation(int)