I guess I don't understand this locking stuff. I have a InnoDB table that
has one thing in it, a counter. All I want to do is have multiple
instances of the code read this counter and increment it. I want to make
sure that each one is unique.
Here is what I am doing in java:
c.setAutoCommit(false);
...
rs = statement.executeQuery("select request_id from requestid_innodb for
update");
...
String updateQuery = "update requestid_innodb set request_id=";
updateQuery = updateQuery + nextRequestId;
tempStatement = c.createStatement();
tempStatement.executeUpdate(updateQuery);
...
c.commit();
c.setAutoCommit(true);
If I have multiple instances of this code running I end up with duplicate
keys. I thought this was suppose to lock the table so that would not happen.
What am I not doing right? What am I not understanding about locking?
Thanks
Patrick
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