Question

爱堆栈，我的第一篇文章完全沮丧。谢谢你的评论！

创建App Engine项目
在我的App Engine项目中创建了第二代MySQL实例
在MySQL实例中创建数据库
在App Engine中，我激活 - ＆gt; Google Cloud Shell＆lt; - 。（我在console.cloud.google.com的命令提示符下工作）

我已经复制了这个基本的GO程序来连接我的MySQL实例。

我构建并运行它。去构建mysqlexample.go ./mysqlexample

我无法成功建立连接。你可以看到我尝试过的所有各种连接字符串，右边是我得到的响应。

我可以使用mysql admin从我的本地Windows机器连接。

帮助？

package main

import (
    "database/sql"
    _ "github.com/go-sql-driver/mysql"
    "log"
    )

func main() {

    const dbIP = "104.xxx.xx.x"
    const dbInstanceName =  "esp-1-dev:us-central1:espdev"
    const dbName = "servpro"
    const dbUserName = "root"
    const dbPassword = "xxxxxxx"

    const dbOpenString = dbUserName + ":" + dbPassword + "@/" + dbInstanceName + "/" + dbName  //GETS RESPONSE default addr for network 'AppEngine:Zone:Project' unknown
    //const dbOpenString = dbUserName + "@cloudsql(" + dbInstanceName + ")/" + dbName   //GETS RESPONSE  dial cloudsql: unknown network cloudsql
    //const dbOpenString = dbUserName + "@/"  //+ "?parseTime=true&loc=UTC"                 //GETS RESPONSE  getsockopt: connection refused
    //const dbOpenString = dbUserName + ":" + dbPassword + "@tcp(" + dbIP + ":3306)/" + dbName  //GETS RESPONSE  dial tcp 104.xxx.xxx.x:3306: getsockopt: connection timed out

    //  Got this from stack overflow.  GoDocs are not updated to reflect 2nd Gen databases.
    //  http://stackoverflow.com/questions/38890022/tls-requested-but-server-does-not-support-tls-error-with-google-cloud-sql-2nd
    //user:password@cloudsql(copiedPastedInstanceConnectionName)/d‌atabaseName?charset=‌charset&collation=co‌llation&tls=tlsConfi‌gName&parseTime=true
    //First Generation Connection String    
        //username:password@cloudsql(appID:CloudSQLInstance)/databasename?parseTime=true&loc=UTC

    db, err := sql.Open("mysql", dbOpenString);
    defer db.Close()

    log.Println("Attempting Ping of database....")

    err = db.Ping()

    if err != nil {
        log.Println("db.Ping() failed:  " + dbOpenString)
        log.Println(err)
    } else {
        log.Println("Success!")
    }

}

Answer 1

https://cloud.google.com/appengine/docs/flexible/go/using-cloud-sql

对于新人来说，App Engine和CloudSQL只是编写最简单的GO程序来连接和与您的CloudSQL第二代数据库进行通信是令人沮丧的！

您可以选择制作App Eng或App Eng Flex，SQL 1st或2nd Gen ....根据组合连接字符串的不同而不同。当您搜索时，所有Google的文档都会将您带到第一代SQL和App Engine而不使用flex，因为这主要是在生产中。如果您这样做，请确保您正在阅读Flex文档。如果这样做，请确保您正在阅读第二代文档。有时它们是完全不同的文档，有时文档堆叠在页面上，你必须转到底部才能看到第二代sql和app eng flex的新内容。

CloudShell很棘手，我仍然无法编译GO并在此处与SQL 2进行通信。我正在成功地与已部署的应用程序引擎flex进行云sql第2代谈话。在SQL PROXY RUNNING中，您必须使用SQL PROXY。你必须通过appengine和SQL来创建这个创建用户的设置。

这是我的工作计划。

package main

import (
"database/sql"
_ "github.com/go-sql-driver/mysql"
"log"
"fmt"
"net/http"
)

func healthCheckHandler(w http.ResponseWriter, r *http.Request) {
fmt.Fprint(w, "ok")
}

func main() {
http.HandleFunc("/", handle)
http.HandleFunc("/_cloudshellProxy/_ah/health", healthCheckHandler)
log.Print("Listening on port 8080")
log.Fatal(http.ListenAndServe(":8080", nil))
}


func handle(w http.ResponseWriter, r *http.Request) {

const dbIP = "104.xxx.xxx.x"
const dbInstanceName =  "projectname:us-central1:sqlinstance"
const dbName = "servxxx"
const dbUserName = "sqlproxysuser"
const dbPassword = "xxxRockxxx"


if r.URL.Path != "/" {
    http.NotFound(w, r)
    return
}
fmt.Fprint(w, "Hello SQL!  Hello?")
fmt.Fprint(w, "\n")

const dbOpenString = dbUserName + ":" + dbPassword + "@unix(/cloudsql/" + dbInstanceName + ")/" + dbName 
//const dbOpenString = dbUserName + ":" + dbPassword + "@cloudsql(" + dbInstanceName + ")/" + dbName 

//-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=--=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
//-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=--=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
//-=- SQL OPEN Statement,  per docs, DOES NOT return an error ever
//-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=--=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
//-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=--=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
db, err := sql.Open("mysql", dbOpenString);
defer db.Close()

err = db.Ping()
if err != nil {
    fmt.Fprint(w, "Failed Connection" + "  " + dbOpenString)
    fmt.Fprint(w, "\n")
    fmt.Fprint(w, err)
    return
} else {
    fmt.Fprint(w, "SUCCESSFUL CONNECTION" + "  " + dbOpenString)
    fmt.Fprint(w, "\n")
}

_, err = db.Exec("CREATE TABLE IF NOT EXISTS exercisecloudsql101 (id INT NOT NULL AUTO_INCREMENT, name VARCHAR(100) NOT NULL, description TEXT, PRIMARY KEY (id))")
if err != nil {
    fmt.Fprint(w, "CREATE TABLE failed:")
    fmt.Fprint(w, "\n")
    fmt.Fprint(w, err) 
    fmt.Fprint(w, "\n")
} else {
    fmt.Fprint(w, "SUCCESSFUL CreateTable" + "  " + dbOpenString)
    fmt.Fprint(w, "\n")
}

}

Answer 2

如果要迁移到第二代Go App Engine（Golang 1.11），请从以下位置更改连接字符串：

user:password@cloudsql(instanceID)/db

到

user:password@unix(/cloudsql/instanceID)/db

Answer 3

遇到了连接到云SQL实例的同样问题。我在windows localhost环境下工作的一个变种如下。我的localhost的IP需要添加到db实例的授权网络中。

Windows localhost通过tcp连接：

user:password@tcp(104.xxx.xxx.xxx:3306)/dbname

从App Engine（第二代CloudSQL）连接到CloudSQL GO

3 个答案: