70-483 全真模擬試験 DEMO

問題1: You have an application that accesses a Microsoft SQL Server database.
The database contains a stored procedure named Proc1. Proc1 accesses several rows of data across
multiple tables.
You need to ensure that after Proc1 executes, the database is left in a consistent state. While Proc1
executes, no other operation can modify data already read or changed by Proc1. (Develop the
solution by selecting and ordering the required code snippets.
You may not need all of the code snippets.)
正解:
Explanation
Box 1:
Box 2:
Box 3:
Box 4: transaction.Commit();
Box 5:
Box 6: transaction.Rollback();
Box 7: } finally {
Box 8:
Note:
* Box 1: Start with the sqlconnection
* Box 2: Open the SQL transaction (RepeatableRead)
/ IsolationLevel
Specifies the isolation level of a transaction.
/ RepeatableRead
Volatile data can be read but not modified during the transaction. New data can be added during the
transaction.
/ ReadCommitted
Volatile data cannot be read during the transaction, but can be modified.
/ ReadUncommitted
Volatile data can be read and modified during the transaction.
Box 3: Try the query
Box 4: commit the transaction
Box 5: Catch the exception (a failed transaction)
Box 6: Rollback the transaction
Box 7: Final cleanup
Box 8: Clean up (close command and connection).
Reference: SqlConnection.BeginTransaction Method
Incorrect:
The transaction is not set up by transactionscope here. Begintransaction is used.