在Java中使用mysql回滚事务

Question

I am inserting data into three table ie

Transaction
TransactionEntry
Payment

First I insert the data in Transaction , and then get Transaction ID and then insert data in TransactionEntry , after this inserting in Payment

Suppose in first two table, data inserted successfully. Then Server breakdown.

How can we Roll Back all the entries? can we control it programmatically or database has default feature to control this type of situation?

How to achieve consistency and integrity?

Which framwork, In java , can control this type of situation?

MySQL Java EE

Answer 1

mysql supports transactions the normal way. Open transaction at the beginning and commit at the end, if something happens in the middle nothing will be posted.

Since you are using Java EE you have to investigate whether your java mysql client proposes or not built in statements. If not, use

SET AUTOCOMMIT=0;

... statements ...

COMMIT;

Answer 2

You need to disable autocommit and commit after your unit of work is done (or rollback when it failed).

This should be something like:

Connection con = ...; //set earlier
con.setAutoCommit(false);
...
try {
  //insert here
  ...
  con.commit();
} catch (Exception e) {
  con.rollback();
  // other exception handling
}