




 
The default value of the 
connect
 keyword argument 
:signal-rollback-errors
 is determined by the value of the 
:default-table-type
 argument. If 
default-table-type
 is 
:support-transactions
 or 
"innodb"
 or 
"bdb"
, then the default value for 
:signal-rollback-errors
 is 
t
, otherwise the default value is 
nil
.