Fix bug on migration 111 (#12736)

* Fix bug on migration 111

* Check reviews when migrating v111

* Fix bug

* Fix commit

models/migrations/v111.go

@@ -357,21 +357,18 @@ func addBranchProtectionCanPushAndEnableWhitelist(x *xorm.Engine) error {
 		return sess.Where("uid=?", reviewer.ID).In("team_id", protectedBranch.ApprovalsWhitelistTeamIDs).Exist(new(TeamUser))
 	}
 
-	sess := x.NewSession()
-	defer sess.Close()
-
-	if _, err := sess.Exec("UPDATE `protected_branch` SET `enable_whitelist` = ? WHERE enable_whitelist IS NULL", false); err != nil {
+	if _, err := x.Exec("UPDATE `protected_branch` SET `enable_whitelist` = ? WHERE enable_whitelist IS NULL", false); err != nil {
 		return err
 	}
-	if _, err := sess.Exec("UPDATE `protected_branch` SET `can_push` = `enable_whitelist`"); err != nil {
+	if _, err := x.Exec("UPDATE `protected_branch` SET `can_push` = `enable_whitelist`"); err != nil {
 		return err
 	}
-	if _, err := sess.Exec("UPDATE `protected_branch` SET `enable_approvals_whitelist` = ? WHERE `required_approvals` > ?", true, 0); err != nil {
+	if _, err := x.Exec("UPDATE `protected_branch` SET `enable_approvals_whitelist` = ? WHERE `required_approvals` > ?", true, 0); err != nil {
 		return err
 	}
 
 	var pageSize int64 = 20
-	qresult, err := sess.QueryInterface("SELECT max(id) as max_id FROM issue")
+	qresult, err := x.QueryInterface("SELECT max(id) as max_id FROM issue")
 	if err != nil {
 		return err
 	}
@@ -385,14 +382,26 @@ func addBranchProtectionCanPushAndEnableWhitelist(x *xorm.Engine) error {
 
 	// Find latest review of each user in each pull request, and set official field if appropriate
 	reviews := []*Review{}
-	var page int64
-	for page = 0; page <= totalPages; page++ {
-		if err := sess.SQL("SELECT * FROM review WHERE id IN (SELECT max(id) as id FROM review WHERE issue_id > ? AND issue_id <= ? AND type in (?, ?) GROUP BY issue_id, reviewer_id)",
+
+	var executeBody = func(page, pageSize int64) error {
+		if err := x.SQL("SELECT * FROM review WHERE id IN (SELECT max(id) as id FROM review WHERE issue_id > ? AND issue_id <= ? AND type in (?, ?) GROUP BY issue_id, reviewer_id)",
 			page*pageSize, (page+1)*pageSize, ReviewTypeApprove, ReviewTypeReject).
 			Find(&reviews); err != nil {
 			return err
 		}
 
+		if len(reviews) == 0 {
+			return nil
+		}
+
+		sess := x.NewSession()
+		defer sess.Close()
+
+		if err := sess.Begin(); err != nil {
+			return err
+		}
+
+		var updated int
 		for _, review := range reviews {
 			reviewer := new(User)
 			has, err := sess.ID(review.ReviewerID).Get(reviewer)
@@ -407,13 +416,24 @@ func addBranchProtectionCanPushAndEnableWhitelist(x *xorm.Engine) error {
 				continue
 			}
 			review.Official = official
-
+			updated++
 			if _, err := sess.ID(review.ID).Cols("official").Update(review); err != nil {
 				return err
 			}
 		}
 
+		if updated > 0 {
+			return sess.Commit()
+		}
+		return nil
+	}
+
+	var page int64
+	for page = 0; page <= totalPages; page++ {
+		if err := executeBody(page, pageSize); err != nil {
+			return err
+		}
 	}
 
-	return sess.Commit()
+	return nil
 }