• MySQL Transactions

    MySQL Transactions



    MySQL Transactions

    What are transactions?

    # Sequential group of DML statements, which is performed as if it were one single work unit.

    # Will never complete unless each individual operation within the group is sucessful.If any operation within the transaction fails, the entire transaction will fail.

    # Begins with the first executable SQL statement.

    # Ends when it is committed or rolled back, either explicitly with a COMMIT or ROLLBACK statement or implicitly when a DDL statement
    is issued.

    Sample Scenario

    Suppose a bank customer transfers money from his savings account (SB a/c) to his current account (CA a/c), the statement will be divided into four blocks:

    # Debit SB a/c
    # Credit CA a/c
    # Record in Transaction Journal.
    # End Transaction

    The SQL statement to debit SB a/c is as follows:

    UPDATE sb_accounts SET balance = balance - 500 WHERE account_no = 932656;

    The SQL statement to credit CA a/c is as follows:

    UPDATE ca_accounts SET balance = balance + 500 WHERE account_no = 933456;

    The SQL statement for recording in the transaction journal is as follows:

    INSERT INTO journal VALUES (100896, 'Transaction on Kumar Atul Jaiswal a/c', '28-NOV-11' 932656, 933456, 500);

    The SQL statement for End Transaction is as follows:




    Ensures that all operations within the work unit are completed successfully; otherwise, the transaction is aborted at the point of failure and previous operations are rolled back to their former state.





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