gdb链式操作使用方式简单灵活，是GF框架官方推荐的数据库操作方式。

链式操作

链式操作可以通过数据库对象的db.Table/db.Model方法或者事务对象的tx.Table/tx.Model方法，基于指定的数据表返回一个链式操作对象*Model，该对象可以执行以下方法。

接口文档：
https://godoc.org/github.com/gogf/gf/database/gdb#Model

  1. func (m *Model) Insert(data ...interface{}) (result sql.Result, err error)
  2. func (m *Model) Replace(data ...interface{}) (result sql.Result, err error)
  3. func (m *Model) Save(data ...interface{}) (result sql.Result, err error)
  4. func (m *Model) Update(dataAndWhere ...interface{}) (result sql.Result, err error)
  5. func (m *Model) Delete(where ...interface{}) (result sql.Result, err error)
  7. func (m *Model) All(where ...interface{} (Result, error)
  8. func (m *Model) One(where ...interface{}) (Record, error)
  9. func (m *Model) Array(fieldsAndWhere ...interface{}) ([]Value, error)
  10. func (m *Model) Value(fieldsAndWhere ...interface{}) (Value, error)
  11. func (m *Model) Count(where ...interface{}) (int, error)
  13. func (m *Model) FindAll(where ...interface{}) (Result, error)
  14. func (m *Model) FindOne(where ...interface{}) (Record, error)
  15. func (m *Model) FindArray(fieldsAndWhere ...interface{}) (Value, error)
  16. func (m *Model) FindValue(fieldsAndWhere ...interface{}) (Value, error)
  17. func (m *Model) FindCount(where ...interface{}) (int, error)
  19. func (m *Model) Struct(pointer interface{}) error
  20. func (m *Model) Structs(pointer interface{}) error
  21. func (m *Model) Scan(pointer interface{}) error
  23. func (m *Model) LeftJoin(joinTable string, on string) *Model
  24. func (m *Model) RightJoin(joinTable string, on string) *Model
  25. func (m *Model) InnerJoin(joinTable string, on string) *Model
  27. func (m *Model) Where(where interface{}, args...interface{}) *Model
  28. func (m *Model) WherePri(where interface{}, args ...interface{}) *Model
  29. func (m *Model) And(where interface{}, args ...interface{}) *Model
  30. func (m *Model) Or(where interface{}, args ...interface{}) *Model
  32. func (m *Model) Group(group string) *Model
  33. func (m *Model) Order(order string) *Model
  35. func (m *Model) Fields(fields string) *Model
  36. func (m *Model) FieldsEx(fields string) *Model
  37. func (m *Model) Data(data...interface{}) *Model
  38. func (m *Model) Batch(batch int) *Model
  39. func (m *Model) Filter() *Model
  40. func (m *Model) Safe(safe...bool) *Model
  42. func (m *Model) DB(db DB) *Model
  43. func (m *Model) TX(tx *TX) *Model
  45. func (m *Model) Master() *Model
  46. func (m *Model) Slave() *Model
  48. func (m *Model) As(as string) *Model
  49. func (m *Model) Chunk(limit int, callback func(result Result, err error) bool)
  50. func (m *Model) Schema(schema string) *Model
  51. func (m *Model) Option(option int) *Model
  52. func (m *Model) OmitEmpty() *Model
  53. func (m *Model) Page(page, limit int) (*Model)
  54. func (m *Model) Offset(offset int) *Model
  55. func (m *Model) Limit(start int, limit int) *Model