-
Notifications
You must be signed in to change notification settings - Fork 8
Commit
This commit does not belong to any branch on this repository, and may belong to a fork outside of the repository.
Merge pull request #54 from olachat/yinloo/transaction-support
add transaction support
- Loading branch information
Showing
25 changed files
with
1,455 additions
and
10 deletions.
There are no files selected for viewing
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,121 @@ | ||
| package coredb | ||
|
|
||
| import ( | ||
| "database/sql" | ||
| "reflect" | ||
| ) | ||
|
|
||
| // An InvalidScanError describes an invalid argument passed to Scan. | ||
| type InvalidScanError struct { | ||
| Type reflect.Type | ||
| } | ||
|
|
||
| func (e *InvalidScanError) Error() string { | ||
| if e.Type == nil { | ||
| return "coredb: target is nil" | ||
| } | ||
|
|
||
| if e.Type.Kind() != reflect.Pointer { | ||
| return "coredb: target must be a non-nil pointer, got " + e.Type.String() | ||
| } | ||
| return "coredb: nil " + e.Type.String() + ")" | ||
| } | ||
|
|
||
| // RowsToStructSlice converts the rows of a SQL query result into a slice of structs. | ||
| // | ||
| // It takes a pointer to a sql.Rows object as input. | ||
| // The function also uses a generic type T, which represents the type of the struct. | ||
| // | ||
| // The function returns a slice of pointers to T structs and an error. | ||
| func RowsToStructSlice[T any](rows *sql.Rows) (result []*T, err error) { | ||
| var u *T | ||
| for rows.Next() { | ||
| u = new(T) | ||
| data := StrutForScan(u) | ||
| err = rows.Scan(data...) | ||
| if err != nil { | ||
| return | ||
| } | ||
| result = append(result, u) | ||
| } | ||
| err = rows.Err() | ||
| return | ||
| } | ||
|
|
||
| // RowToStruct converts a database row into a struct. | ||
| // | ||
| // It takes a pointer to a sql.Row and returns a pointer to the converted struct and an error. | ||
| func RowToStruct[T any](row *sql.Row) (result *T, err error) { | ||
| result = new(T) | ||
| data := StrutForScan(result) | ||
| err = row.Scan(data...) | ||
| if err == sql.ErrNoRows { | ||
| err = nil | ||
| } | ||
| return | ||
| } | ||
|
|
||
| // StrutForScan returns value pointers of given obj | ||
| func StrutForScan(u any) (pointers []any) { | ||
| val := reflect.ValueOf(u).Elem() | ||
| pointers = make([]any, 0, val.NumField()) | ||
| for i := 0; i < val.NumField(); i++ { | ||
| valueField := val.Field(i) | ||
| if f, ok := valueField.Addr().Interface().(ColumnType); ok { | ||
| pointers = append(pointers, f.GetValPointer()) | ||
| } | ||
| } | ||
| return | ||
| } | ||
|
|
||
| func RowsToStructSliceReflect(rows *sql.Rows, out any) (err error) { | ||
| if rows == nil { | ||
| return | ||
| } | ||
| sliceValue := reflect.ValueOf(out) | ||
| if sliceValue.Kind() != reflect.Ptr || sliceValue.IsNil() { | ||
| panic(&InvalidScanError{Type: sliceValue.Type()}) | ||
| } | ||
| sliceValue = sliceValue.Elem() | ||
| if sliceValue.Kind() != reflect.Slice { | ||
| panic(&InvalidScanError{Type: reflect.TypeOf(out)}) | ||
| } | ||
| elementType := sliceValue.Type().Elem() | ||
| if elementType.Kind() != reflect.Ptr { | ||
| panic(&InvalidScanError{Type: reflect.TypeOf(out)}) | ||
| } | ||
| elementType = elementType.Elem() | ||
|
|
||
| var elements []reflect.Value | ||
| for rows.Next() { | ||
| v := reflect.New(elementType) | ||
| data := StrutForScan(v.Interface()) | ||
| err = rows.Scan(data...) | ||
| if err != nil { | ||
| return | ||
| } | ||
| elements = append(elements, v.Elem()) | ||
| } | ||
|
|
||
| sliceValue.Set(reflect.MakeSlice(sliceValue.Type(), len(elements), len(elements))) | ||
| for i, v := range elements { | ||
| sliceValue.Index(i).Set(v.Addr()) | ||
| } | ||
|
|
||
| err = rows.Err() | ||
| return | ||
| } | ||
|
|
||
| func RowToStructReflect(row *sql.Row, v any) (err error) { | ||
| rv := reflect.ValueOf(v) | ||
| if rv.Kind() != reflect.Pointer || rv.IsNil() { | ||
| panic(&InvalidScanError{reflect.TypeOf(v)}) | ||
| } | ||
|
|
||
| data := StrutForScan(v) | ||
| err = row.Scan(data...) | ||
| if err == sql.ErrNoRows { | ||
| return nil | ||
| } | ||
| return | ||
| } |
Oops, something went wrong.