MySQL closes the problem of automatic submission of connection transactions

         In today's independent experiment , It is found that the statement of automatically submitting transactions when the database closes the connection has not been realized in the experiment , Therefore, looking up a lot of data, we have the following results .       

        MySQL Transactions are automatically committed by default , When we need to rollback a transaction, we need to automatically commit and close the transaction , You can set... With the following command ：

set AutoCommit = 0;

         After the transaction is completed, you can submit it with the following command ：

commit

         When closing the database connection , Transactions are also automatically committed , But at this time Automatic submission must be restored to true, Prove the following ：

• When the automatic submission of the database is false when , Change data in table , Close the database directly , The data in the query table remains unchanged .

         Initial data in the table ：

          Change the database to be automatically submitted as false：

          Modify the data in the table ：

          Close the connection directly ：

          Reconnect and query the data ：

         here , We find that the data in the table has not changed , That is to say, the transaction is not automatically committed when the connection is closed .

• When the automatic submission of the database is false when , Change data in table , At this time, change the automatic submission of the database to true, Then close the database connection , The data in the query table has changed .

          Initial data in the table ：

          Change the database to be automatically submitted as false：

          Modify the data in the table ：

         Then change the database to be automatically submitted as true：

          Close the connection ：

          Query the data in the table ：

          At this time, we find that the data in the table has changed , That is, the database automatically commits the transaction .

         Access to information , Find the following code ：

                if (!skipLocalTeardown) {
                    if (!this.getAutoCommit() && issueRollback) {
                        try {
                            this.rollback();
                        } catch (SQLException var21) {
                            sqlEx = var21;
                        }
                    }

        skipLocalTeardown and issueRollback stay close When calling, the default is false, We can see that when auto submit is turned off , When the connection is closed rollback Instead of submitting automatically . So I guess whether it is necessary to automatically commit transactions when closing the connection autoCommit by true Under the circumstances .

summary ：

        MySQL You want to automatically commit transactions when your database connection is closed , Be sure to set automatic submission to... Before closing the connection true