package database import ( "database/sql" "database/sql/driver" "encoding/json" "fmt" "gorm.io/gorm" "reflect" ) type NullTime sql.NullTime func (n *NullTime) Scan(value any) error { return (*sql.NullTime)(n).Scan(value) } func (n NullTime) Value() (driver.Value, error) { if !n.Valid { return nil, nil } return n.Time, nil } func (n NullTime) MarshalJSON() ([]byte, error) { if n.Valid { return json.Marshal(n.Time) } return json.Marshal(nil) } func (n *NullTime) UnmarshalJSON(b []byte) error { if string(b) == "null" { n.Valid = false return nil } err := json.Unmarshal(b, &n.Time) if err == nil { n.Valid = true } return err } /*-----------------------------------------------------------*/ type PaginateList struct { Page int64 `json:"page"` Size int64 `json:"size"` Total int64 `json:"total"` List any `json:"list"` } func Paginate(db *gorm.DB, model any, page, size int64) (*PaginateList, error) { ptr := reflect.ValueOf(model) if ptr.Kind() != reflect.Ptr { return nil, fmt.Errorf("model must be pointer") } var total int64 err := db.Model(model).Count(&total).Error if err != nil { return &PaginateList{ Page: page, Size: size, Total: total, List: make([]any, 0), }, err } offset := size * (page - 1) err = db.Limit(int(size)).Offset(int(offset)).Find(model).Error if err != nil { return &PaginateList{ Page: page, Size: size, Total: total, List: make([]any, 0), }, err } return &PaginateList{ Page: page, Size: size, Total: total, List: model, }, nil }