sql查询函数中的变量参数

This is my code

func QueryMap2(db *sql.DB, query string, args ...interface{}) (error) {
rows, err := db.Query(query, args...)
if err!=nil {
    return err
}

....

dblib.QueryMap2(myDB, "select * from user where userid=?", "admin")

This is error message

panic: interface conversion: interface {} is int64, not []uint8

help me