Isolation
Related Doc:
package api
Support a current transaction, create a new one if none exists.
Support a current transaction, create a new one if none exists. Analogous to EJB transaction attribute of the same name.
This is the default setting of a transaction annotation.
A constant indicating that dirty reads are prevented; non-repeatable reads and phantom reads can occur.
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.
java.sql.Connection#TRANSACTION_READ_COMMITTED
A constant indicating that dirty reads, non-repeatable reads and phantom reads can occur.
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.
java.sql.Connection#TRANSACTION_READ_UNCOMMITTED
A constant indicating that dirty reads and non-repeatable reads are prevented; phantom reads can occur.
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").
java.sql.Connection#TRANSACTION_REPEATABLE_READ
A constant indicating that dirty reads, non-repeatable reads and phantom reads are prevented.
A constant indicating that dirty reads, non-repeatable reads and phantom
reads are prevented. This level includes the prohibitions in
ISOLATION_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.
java.sql.Connection#TRANSACTION_SERIALIZABLE
Created by sauntor on 17-3-21.