Method getServerVariable

backend/plugin/db/tidb/sync.go:117–131

(ctx context.Context, varName string)

}

func (d *Driver) getServerVariable(ctx context.Context, varName string) (string, error) {
	db := d.GetDB()
	query := fmt.Sprintf("SHOW VARIABLES LIKE '%s'", varName)
	var varNameFound, value string
	if err := db.QueryRowContext(ctx, query).Scan(&varNameFound, &value); err != nil {
		if err == sql.ErrNoRows {
			return "", common.FormatDBErrorEmptyRowWithQuery(query)
		}
		return "", util.FormatErrorWithQuery(err, query)
	}
	if varName != varNameFound {
		return "", errors.Errorf("expecting variable %s, but got %s", varName, varNameFound)
	}
	return value, nil
}

// SyncDBSchema syncs a single database schema.
func (d *Driver) SyncDBSchema(ctx context.Context) (*storepb.DatabaseSchemaMetadata, error) {