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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
2 changed files with 43 additions and 11 deletions
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27
models/db/convert.go
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@@ -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 {