Question

when I print the isolation level

 DatabaseMetaData dbMetaData = conn.getMetaData();
             if (dbMetaData                         .supportsTransactionIsolationLevel(Connection.TRANSACTION_SERIALIZABLE)) {
                     System.out.println("Transaction Isolation level= "
                                     + conn.getTransactionIsolation());
                     System.out.println(dbMetaData.getDefaultTransactionIsolation());
             }

for the connection I get an integer value 4
and for the database I get a value 2

I want to set the isolation level as SERIALIZABLE as it seems to work for most of the problems(that’s what i heard anyways :-/) but i am not getting as to how to set it as its asking for a int value

conn.setTransactionIsolation(level);

what does the integer levels refer to and in which order to the transaction levels? I am using mysql database

Answer 1

The Connection class should have all the isolation levels defined as constants. Go to the Javadoc and you can see the constants.

conn.setTransactionIsolation(Connection.TRANSACTION_SERIALIZABLE );

NOTE: TRANSACTION_SERIALIZABLE might not be the one what you want. I suggest you read this tutorial.

print readable string

String getReadableLevel(int isolation)
{
String result="";

switch(isolation)
{
  case Connection.TRANSACTION_SERIALIZABLE: result="TRANSACTION_SERIALIZABLE";break;
  ...//u get the idea
}
return result;
}