## Background
Currently, XORM does not yet support the [GBase 8s database by Nanda General Data Technology]. GBase 8s is a widely used domestic database in China, commonly adopted by enterprises and government systems as a backend storage solution.
## Summary of This Contribution
• Added support for the gbase8s driver
• Implemented a basic database dialect: GBase8sDialect
## Usage Instructions
```go
import _ "gitee.com/GBase8s/go-gci""
engine, err := xorm.NewEngine("gbase8s", "gbase8s://username:pwd@ip:port/dbname?param=xxx")
Co-authored-by: zhangyunfei <zhangyunfei@gbase.cn>
Reviewed-on: https://gitea.com/xorm/xorm/pulls/2517
Reviewed-by: Lunny Xiao <xiaolunwen@gmail.com>
Co-authored-by: maktub <maktub@noreply.gitea.com>
Co-committed-by: maktub <maktub@noreply.gitea.com>
db7c264062/sync.go (L229-L231)
as oriIndex only is **not** nil if index.Equal(index2)
and index.Equal(index2) check if `oriIndex.Type == index.Type` ... so it always is false
Co-authored-by: Lunny Xiao <xiaolunwen@gmail.com>
Reviewed-on: https://gitea.com/xorm/xorm/pulls/2323
Reviewed-by: Lunny Xiao <xiaolunwen@gmail.com>
Co-authored-by: 6543 <6543@obermui.de>
Co-committed-by: 6543 <6543@obermui.de>
## `loadTableInfo` add context parameter
### Main change
```diff
+++ func (engine *Engine) loadTableInfo(ctx context.Context, table *schemas.Table) error
--- func (engine *Engine) loadTableInfo(table *schemas.Table) error
```
### Situation
After #2200, I built custom dialect to control the SQL. I find that everything else is fine, except when the `SYNC` method executes with an exception.
The reason is that the `loadTableInfo` method calls the `GetIndexes` and `GetColumns` methods with the dialect during execution. **The context passed to these two methods are all `engine.defaultContext` not the current session's context.** So, I think the `loadTableInfo` method should add the context parameter to ensure that the correct context is used during execution.
### Review Note
1. dialect's `GetColumns` and `GetIndexes` methods are **only** used here, if the context here is incorrect, then the context parameter is invalid.
2. `loadTableInfo` method is only used in `SYNC` and `DBMetas` methods, `SYNC` should pass the session's context, while `DBMetas` has no problem passing `engine.defaultContext`.
All in all, I think this change should not affect other function.
Reviewed-on: https://gitea.com/xorm/xorm/pulls/2297
Co-authored-by: LinkinStars <linkinstar@foxmail.com>
Co-committed-by: LinkinStars <linkinstar@foxmail.com>
Lunny Xiao
maktub
DacongDA
6543
LinkinStars
brookechen