英文:
Connecting to mysql database with go
问题
我正在尝试与我的MySQL服务器建立基本连接，但似乎无法实际连接。我知道凭据是有效的，并且具有所需的所有权限，但由于某种原因它们始终被拒绝。
package main
import (
"fmt"
"database/sql"
_ "github.com/go-sql-driver/mysql"
"os"
)
func main() {
db, err:= sql.Open("mysql", "user:pass@tcp(localhost:3306)/scf")
if err != nil {
fmt.Println(err)
os.Exit(1)
}
q, err := db.Prepare("SELECT * from logins limit 5")
if err != nil {
fmt.Println(err)
os.Exit(1)
}
rows, err := q.Query()
if err != nil {
fmt.Println(err)
os.Exit(1)
}
i := 0
for rows.Next() {
i++
var title string
err = rows.Scan( &title )
fmt.Printf("Title: %s \n", title)
}
db.Close()
}
编辑：
显然我忘记包含错误信息：
dial tcp 127.0.0.1:3306: connection refused
exit status 1
英文:
I'm trying to get a basic connect to my mysql server, but I can't seem to get it to actually connect. I know the credentials are valid and have all the permissions they need, but for some reason they're consistently rejected.
package main
import (
"fmt"
"database/sql"
_ "github.com/go-sql-driver/mysql"
"os"
)
func main() {
db, err:= sql.Open("mysql", "user:pass@tcp(localhost:3306)/scf")
if err != nil {
fmt.Println(err)
os.Exit(1)
}
q, err := db.Prepare("SELECT * from logins limit 5")
if err != nil {
fmt.Println(err)
os.Exit(1)
}
rows, err := q.Query()
if err != nil {
fmt.Println(err)
os.Exit(1)
}
i := 0
for rows.Next() {
i++
var title string
err = rows.Scan( &title )
fmt.Printf("Title: %s \n", title)
}
db.Close()
}
Edit:
Apparently I forgot to include the error:
dial tcp 127.0.0.1:3306: connection refused
exit status 1
答案1
得分: 3
连接被拒绝通常意味着端口未打开或被防火墙阻止。请检查以下几点：
- MySQL（在本地主机上）是否正在运行？它是否在3306端口上？
- 如果你使用的是Windows、Mac或Linux系统，是否有防火墙可能阻止了3306端口？
- 如果你使用的是Linux系统，是否启用了SELinux，它可能会阻止3306端口的连接？
英文:
connection refused generally means the port isn't open or is being blocked by a firewall. A couple things to check:
- Is MySQL (on localhost) running? Is it on port 3306?
- If you're on Windows, Mac or Linux, is there a firewall that might be blocking port 3306?
- If you're on Linux, is SELinux enabled that might be blocking port 3306?
答案2
得分: 0
我遇到了类似的问题。我发现在Mac上端口是不同的。我在my.cnf中找不到它，但是端口是在运行时设置的，你可以使用以下命令查看：
ps ax | grep mysql
英文:
I faced a similar issue. I found out port was different on Mac. I Couldn't find it in my.cnf but the port was set during runtime which you can see using
ps ax | grep mysql
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