Add command to convert mysql database from utf8 to utf8mb4 (#7144)

* add command to convert mysql database from utf8 to utf8mb4

* Update cmd/convert.go

Co-Authored-By: John Olheiser <42128690+jolheiser@users.noreply.github.com>

* Update cmd/convert.go

Co-Authored-By: John Olheiser <42128690+jolheiser@users.noreply.github.com>

* Update cmd/convert.go

Co-Authored-By: John Olheiser <42128690+jolheiser@users.noreply.github.com>

* Update models/convert.go

Co-Authored-By: John Olheiser <42128690+jolheiser@users.noreply.github.com>

* Update models/convert.go

Co-Authored-By: John Olheiser <42128690+jolheiser@users.noreply.github.com>

* Update cmd/convert.go

Co-Authored-By: John Olheiser <42128690+jolheiser@users.noreply.github.com>

* Update cmd/convert.go

Co-Authored-By: John Olheiser <42128690+jolheiser@users.noreply.github.com>

1 files changed, 27 insertions, 0 deletions

diff --git a/models/convert.go b/models/convert.go
new file mode 100644
index 0000000000..c34be973c6
--- /dev/null
+++ b/models/convert.go
@@ -0,0 +1,27 @@
+// Copyright 2019 The Gitea Authors. All rights reserved.
+// Use of this source code is governed by a MIT-style
+// license that can be found in the LICENSE file.
+
+package models
+
+import "fmt"
+
+// ConvertUtf8ToUtf8mb4 converts database and tables from utf8 to utf8mb4 if it's mysql
+func ConvertUtf8ToUtf8mb4() error {
+	_, err := x.Exec(fmt.Sprintf("ALTER DATABASE `%s` CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci", DbCfg.Name))
+	if err != nil {
+		return err
+	}
+
+	tables, err := x.DBMetas()
+	if err != nil {
+		return err
+	}
+	for _, table := range tables {
+		if _, err := x.Exec(fmt.Sprintf("ALTER TABLE `%s` CONVERT TO CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci;", table.Name)); err != nil {
+			return err
+		}
+	}
+
+	return nil
+}