diff --git a/basicModels.go b/basicModels.go
index bf095b5..5a16406 100644
--- a/basicModels.go
+++ b/basicModels.go
@@ -10,7 +10,7 @@ type patient struct {
 	Name         string
 	Surname      string
 	BirthDate    time.Time
-	PatientState patientStates
+	PatientState sql.NullString
 	PatientSex   sex
 	PatientEmail string
 }
@@ -37,7 +37,7 @@ type operation struct {
 	Name          string
 	averageTime   string
 	operationType operationTypes
-	cost          []uint8
+	cost          uint8
 	refoundation  int64
 }
 
@@ -48,14 +48,14 @@ type room struct {
 }
 
 type admission struct {
-	AdmissionID     int
+	AdmissionID     int64
 	AdmissionDate   time.Time
 	EndDate         time.Time
 	PatientPesel    string
 	DiagnosisSymbol string
-	MainDoctor      int
-	PlanedOperation int
-	RoomNumber      int
+	MainDoctor      int64
+	PlanedOperation int64
+	RoomNumber      int64
 	IsPlanned       bool
 }
 
@@ -70,7 +70,10 @@ type admissions []admission
 type operations []operation
 type rooms []room
 
-type iDatabaseModel interface{}
+type iDatabaseModel interface {
+	getPrimaryKey() string
+	getPrimaryKeyName() string
+}
 type iDatabaseModels []iDatabaseModel
 type iStoreModels interface {
 	readModels(rows *sql.Rows) iDatabaseModels