*************** func (db *DB) putConn(dc *driverConn, er
*** 797,802 ****
--- 797,806 ----
  // If a connRequest was fulfilled or the *driverConn was placed in the
  // freeConn list, then true is returned, otherwise false is returned.
  func (db *DB) putConnDBLocked(dc *driverConn, err error) bool {
+   if db.numOpen > db.maxOpen {
+       return false
+   }
+ 
    if c := len(db.connRequests); c > 0 {
        req := db.connRequests[0]
        // This copy is O(n) but in practice faster than a linked list.