update readme

Author: zhuah

README.md

@@ -92,15 +92,15 @@ type Follow struct {
     FollowUserId int64
 }
 
+
 //gomodel insertUserFollowSQL = [
 //  INSERT INTO Follow(UserId, FollowUserId)
 //      SELECT ?, ? FROM DUAL
 //      WHERE EXISTS(SELECT Id FROM User WHERE Id=?)
 //]
 func (f *Follow) Add() error {
-    return f.txDo(func(tx gomodel.Tx, f *Follow) error {
-        stmt, err := tx.PrepareById(insertUserFollowSQL)
-        c, err := gomodel.CloseUpdate(stmt, err, gomodel.FieldVals(f, followFieldsAll, f.FollowUserId)...)
+    return f.txDo(DB, func(tx gomodel.Tx, f *Follow) error {
+        c, err := tx.UpdateById(insertUserFollowSQL, gomodel.FieldVals(f, followFieldsAll, f.FollowUserId)...)
 
         err = dberrs.NoAffects(c, err, ErrNoUser)
         err = dberrs.DuplicateKeyError(err, dberrs.PRIMARY_KEY, ErrFollowed)
@@ -110,7 +110,7 @@ func (f *Follow) Add() error {
 }
 
 func (f *Follow) Delete() error {
-    return f.txDo(func(tx gomodel.Tx, f *Follow) error {
+    return f.txDo(DB, func(tx gomodel.Tx, f *Follow) error {
         c, err := tx.Delete(f, followFieldsAll)
         err = dberrs.NoAffects(c, err, ErrNonFollow)
 
@@ -127,6 +127,7 @@ func (f *Follow) updateFollowInfo(tx gomodel.Tx, err error, c int) error {
     }
     return err
 }
+
 ```
 
 # LICENSE

example/userfollow/follow.go

@@ -23,8 +23,7 @@ type Follow struct {
 //]
 func (f *Follow) Add() error {
 	return f.txDo(DB, func(tx gomodel.Tx, f *Follow) error {
-		stmt, err := tx.PrepareById(insertUserFollowSQL)
-		c, err := gomodel.CloseUpdate(stmt, err, gomodel.FieldVals(f, followFieldsAll, f.FollowUserId)...)
+		c, err := tx.UpdateById(insertUserFollowSQL, gomodel.FieldVals(f, followFieldsAll, f.FollowUserId)...)
 
 		err = dberrs.NoAffects(c, err, ErrNoUser)
 		err = dberrs.DuplicateKeyError(err, dberrs.PRIMARY_KEY, ErrFollowed)