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Support converting varchar to nvarchar for mssql database (#24105) (#24168)

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Backport #24105 by @lunny

In #12269, all string fields of struct will generate a NVARCHAR column
in database, but for those Gitea instances installed before that PR,
users have to convert columns themselves.

In this PR, we update the `./gitea admin convert` commands to support
both MySQL and MSSQL database converting. Previously, it only supported
converting `utf8 -> utf8mb4` for MySQL.
Now, it will check the database types.
If it's MSSQL, it will convert `VARCHAR -> NVARCHAR` as well.

Co-authored-by: Lunny Xiao <xiaolunwen@gmail.com>
This commit is contained in:
Giteabot 2023-04-17 10:10:15 -04:00 committed by GitHub
parent 03b6e7900b
commit c4f569b9a5
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GPG key ID: 4AEE18F83AFDEB23
2 changed files with 43 additions and 11 deletions
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27
cmd/convert.go
View file

@ -17,7 +17,7 @@ import (
var CmdConvert = cli.Command{
Name: "convert",
Usage: "Convert the database",
Description: "A command to convert an existing MySQL database from utf8 to utf8mb4",
Description: "A command to convert an existing MySQL database from utf8 to utf8mb4 or MSSQL database from varchar to nvarchar",
Action: runConvert,
}
@ -35,17 +35,22 @@ func runConvert(ctx *cli.Context) error {
log.Info("Log path: %s", setting.Log.RootPath)
log.Info("Configuration file: %s", setting.CustomConf)
if !setting.Database.Type.IsMySQL() {
fmt.Println("This command can only be used with a MySQL database")
return nil
switch {
case setting.Database.Type.IsMySQL():
if err := db.ConvertUtf8ToUtf8mb4(); err != nil {
log.Fatal("Failed to convert database from utf8 to utf8mb4: %v", err)
return err
}
fmt.Println("Converted successfully, please confirm your database's character set is now utf8mb4")
case setting.Database.Type.IsMSSQL():
if err := db.ConvertVarcharToNVarchar(); err != nil {
log.Fatal("Failed to convert database from varchar to nvarchar: %v", err)
return err
}
fmt.Println("Converted successfully, please confirm your database's all columns character is NVARCHAR now")
default:
fmt.Println("This command can only be used with a MySQL or MSSQL database")
}
if err := db.ConvertUtf8ToUtf8mb4(); err != nil {
log.Fatal("Failed to convert database from utf8 to utf8mb4: %v", err)
return err
}
fmt.Println("Converted successfully, please confirm your database's character set is now utf8mb4")
return nil
}

27
models/db/convert.go
View file

@ -42,6 +42,33 @@ func ConvertUtf8ToUtf8mb4() error {
return nil
}
// ConvertVarcharToNVarchar converts database and tables from varchar to nvarchar if it's mssql
func ConvertVarcharToNVarchar() error {
if x.Dialect().URI().DBType != schemas.MSSQL {
return nil
}
sess := x.NewSession()
defer sess.Close()
res, err := sess.QuerySliceString(`SELECT 'ALTER TABLE ' + OBJECT_NAME(SC.object_id) + ' MODIFY SC.name NVARCHAR(' + CONVERT(VARCHAR(5),SC.max_length) + ')'
FROM SYS.columns SC
JOIN SYS.types ST
ON SC.system_type_id = ST.system_type_id
AND SC.user_type_id = ST.user_type_id
WHERE ST.name ='varchar'`)
if err != nil {
return err
}
for _, row := range res {
if len(row) == 1 {
if _, err = sess.Exec(row[0]); err != nil {
return err
}
}
}
return err
}
// Cell2Int64 converts a xorm.Cell type to int64,
// and handles possible irregular cases.
func Cell2Int64(val xorm.Cell) int64 {