问题描述
我正在尝试将一些二进制数据存储到 minikube 笔记本电脑上的 yugabytedb 中,因此我使用了文档中所说的 bytea
数据类型。
但是当涉及到使用 select 查询检索二进制数据时,返回的字节与我预期的非常不同!
这可能是什么原因?
解决方法
我有办法
这是我的代码:
/*
===============================
GOLANG CODE REGISTERING A USER:
================================
*/
db := dbconnect()
defer db.Close()
log.Println("Registration Server says: user.Photo = ",user.Photo[:100])
usrInsert := fmt.Sprintf("INSERT INTO users (user_id,username,Phone,Email,Nationality,Photo,pxwrd)
VALUES ('%s','%s','%x','%s')",user.user_id,user.username,user.Phone,user.Email,user.Nationality,user.Photo,encriptedpassword)
_,err := db.Exec(usrInsert)
if err != nil {
fmt.Println(err.Error());
}
/*
=============================================
OUTPUT OF 'log.Println' ABOVE WAS:
=============================================
Registration Server says: user.Photo = [1 0 0 0 0 0 6
213 194 0 0 0 24 255 216 255 224 0 16 74 70 73 70 0 1 2 1
1 44 1 44 0 0 255 225 16 115 69 120 105 102 0 0 77 77 0 42
0 0 0 8 0 11 1 15 0 2 0 0 0 18 0 0 0 146 1 16 0 2 0 0 0 10
0 0 0 164 1 18 0 3 0 0 0 1 0 1 0 0 1 26 0 5 0 0 0 1 0 0 0]
*/
/*
=============================
GOLANG CODE FOR USER LOGIN:
=============================
Note: the user profile Photo is
saved as 'bytea' data type
*/
//select query for loging in
selecQuery := fmt.Sprintf("SELECT * FROM users WHERE
username='%s' AND pxwrd='%x' ",uname,encriptedpassword)
queryResult,err := db.Query(selecQuery)
if err != nil {
fmt.Println(err.Error())
}
defer queryResult.Close()
userExists := false
for queryResult.Next() {
userExists = true
var UserX rs_utils.User
var cnt,psw string
err = queryResult.Scan(&cnt,&UserX.User_id,&UserX.Username,&UserX.Phone,&UserX.Email,&UserX.Nationality,&UserX.Photo,&psw)
if err != nil {
log.Println("!! Error: ",err)
break
}
log.Println("UserX.Photo,psw :\n",UserX.Photo[:100],psw)
//...
/...
}
/*
==============================
OUTPUT OF 'log.Println' ABOVE:
==============================
UserX.Photo,psw :
[48 49 48 48 48 48 48 48 48 48 48 48 49 53 97 98 48 53 48 48 48
48 48 48 50 97 56 57 53 48 52 101 52 55 48 100 48 97 49 97 48 97
48 48 48 48 48 48 48 100 52 57 52 56 52 52 53 50 48 48 48 48 48
52 54 99 48 48 48 48 48 50 55 102 48 56 48 54 48 48 48 48 48 48
50 100 54 50 52 53 53 51 48 48 48 48 48
48 48 49] 8ae5776067290c4712fa454006c8ec6
*/
如您所见,检索到的二进制数据与 插入了什么。 原因:
usrInsert := fmt.Sprintf("INSERT INTO users (user_id,pxwrd)
VALUES ('%s',encriptedpassword)
_,err := db.Exec(usrInsert)
//AND
selecQuery := fmt.Sprintf("SELECT * FROM users WHERE
username='%s' AND pxwrd='%x' ",encriptedpassword)
queryResult,err := db.Query(selecQuery)
//Notice the string formatting in the queries.
解决方案: 我用以下代码替换了上面的代码行:
_,err := db.Exec(`INSERT INTO users (user_id,pxwrd)
VALUES ($1,$2,$3,$4,$5,$6,$7)`,encriptedpassword)
//AND
queryResult,err := db.Query(`SELECT * FROM users WHERE
username=$1 AND pxwrd=$2 `,encriptedpassword)
分别。