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need help finishing my homework it3939s been 5 years since i3939ve use c i am a vnnet
fetching across commitsthe for update clauses acquire exclusive all row locks all rows are locked when you open the cursor and when you commit your
using lock tableyou use the lock table statement to lock the whole database tables in the specified lock mode so that you can share or deny the
using for updateif you declare a cursor which will be referenced in the current of clause of an update or delete statement you should use the for
overriding default lockingby default the oracle locks the data structures for you automatically though you can request exact data locks on rows or
using set transactionyou use the set transaction statement to begin the read-only or read-write transaction start an isolation level or assign your
ending transactionsa good quality programming practice is to commit or roll back every transaction explicitly whether you rollback or issue the
implicit rollbacksbefore execute the insert update or delete statement the oracle marks an implicit savepoint when the statement fails the oracle
using savepointthe savepoint names and marks the present point in the processing of a transaction used with the rollback to statement the savepoints
using rollbackthe rollback statements end the present transaction and undo any change made during the transaction the rolling back is helpful for two
using committhe commit statements end the present transaction and make permanent any changes made during that transaction till you commit the changes
how transactions guard your databasethe transaction is a sequence of sql data manipulation statements which does a logical unit of work the oracle
processing transactionsthis part describes how to do the transaction processing you learn the fundamental techniques that safeguard the consistency
rowcountthe rowcount yields the number of rows affected by the insert update or delete statement or returned by a select into statement the rowcount
notfoundthe notfound is the logical opposite of the found the notfound yields true when an insert update or delete statement affected no rows or the
isopenthe oracle closes the sql cursor automatically after executing its related sql statement as a result the isopen forever yields
founduntil the sql data manipulation statement is executed the found yields null afterward the found yields true when an insert update or delete
implicit cursor attributesthe implicit cursor attributes returns the information about the execution of an insert delete update or select into
rowcountwhen its cursor or cursor variable is opened the rowcount is zeroed before the first fetch the rowcount yields 0 afterward it yields the
notfoundthe notfound is logical opposite of the found the notfound yields false if the last fetch returned a row or true when the final fetch failed
isopenthe isopen yields true if its cursor or cursor variable is open or else the isopen yields false in the illustration you use the isopen to
foundsubsequent to a cursor or cursor variable is opened but before the first fetch the found yields null afterward it yields true when the last
explicit cursor attributesthe cursor variable or each cursor has four attributes found isopen rowcount and notfound when appended to the cursor or
closing a cursor variablethe close statement disables the cursor variable after that the related result set is undefined the syntax for the same is
fetching from a cursor variablethe fetch statement retrieve rows one at a time from the product set of a multi-row query the syntax for the same is