浅风

 我在自己的项目这样写会报空指针异常

```golang func run(dsn string) { // install the wrapped driver sql.Register("postgres-mw", sqlmw.Driver(pq.Driver{}, new(sqlInterceptor))) db, err := sql.Open("postgres-mw", dsn) ... } type sqlInterceptor struct { sqlmw.NullInterceptor } func (in *sqlInterceptor) StmtQueryContext(ctx...