Interface package golang

 

A statement interfaces

1 type Result interface {
2     LastInsertId() (int64, error)
3     RowsAffected() (int64, error)
4 }

 

Second, implement the interface, the interface puts here as a member variable, and then will achieve the conversion interface is call interface, only the interface package, in fact, did not really realize, but wait for others to achieve

1  //     a lock
 2  //     false set of interfaces to achieve a result, a functional need, let others be embodied. Pretend implements an interface method actually calls the corresponding internal interface 
3  of the type driverResult struct {
 4      sync.Locker
 5      Resi driver.Result
 6  }
 7  //     the Result is a summary of the executed SQL commands.
. 8  //     lastInsertId () returns an integer generated by the database, this integer is the response to the command. In inserting a new row of data, generally derived from the self-energizing integer data column in the data table.
9  //     Not all databases support this feature, and individual statements database used in implementing this feature will be different.
10  //     RowsAffected () returns subject to update, insert, or delete operation affects the number of rows, not all databases or all database drivers support this feature. 
. 11 type the Result interface {
 12 is     LastInsertId() (int64, error)
13     RowsAffected() (int64, error)
14 }
15 
16 func (dr driverResult) LastInsertId() (int64, error) {
17     dr.Lock()
18     defer dr.Unlock()
19     return dr.resi.LastInsertId()
20 }
21 
22 func (dr driverResult) RowsAffected() (int64, error) {
23     dr.Lock()
24     defer dr.Unlock()
25     return dr.resi.RowsAffected()
26 }