public CartDao(IConnectionStringGetter connectionStringGetter)
 {
     this.connectionString = connectionStringGetter.Get();
 }
 public PurchaseDao(IConnectionStringGetter connectionStringGetter)
 {
     this.connectionString = connectionStringGetter.Get();
 }
 public BookDao(IConnectionStringGetter getter)
 {
     this.connectionString = getter.Get();
 }