int TRANSACTION_NONE = 0;
int TRANSACTION_READ_UNCOMMITTED = 1;
int TRANSACTION_READ_COMMITTED = 2;
int TRANSACTION_REPEATABLE_READ = 4;
int TRANSACTION_SERIALIZABLE = 8;
int TRANSACTION_NONE = 0;
int TRANSACTION_READ_UNCOMMITTED = 1;
int TRANSACTION_READ_COMMITTED = 2;
int TRANSACTION_REPEATABLE_READ = 4;
int TRANSACTION_SERIALIZABLE = 8;