readonlyTx
fun <T> readonlyTx(db: Database? = null, transactionIsolation: Int? = db?.transactionManager?.defaultIsolationLevel, statement: JdbcTransaction.() -> T): T
Executes a read-only database transaction.
Called inside another transaction, this does not start a new one: with Exposed's default useNestedTransactions = false the block joins the outer transaction, and with nesting on it inherits the outer transaction's read-only flag and isolation level. Either way, transactionIsolation and read-only mode (where applicable) are not applied, and only an outermost call commits.
Return
the result of statement
Parameters
db
the Database to use, or null for the default database
transactionIsolation
the JDBC transaction isolation level
statement
the transaction body to execute
Type Parameters
T
the return type of the transaction