我正在用 Go 構(gòu)建一個應(yīng)用程序，并使用 Google App Engine 進行部署。我已經(jīng)在 Google Cloud 上設(shè)置了一個 PostgreSQL 實例，啟用了 API，并使用本地計算機上的 SQL 代理（從本地 PSequel 客戶端和我的應(yīng)用程序）成功連接到它。gcloud app deploy但是，當(dāng)我這樣做時，我收到此錯誤：ERROR: (gcloud.app.deploy) Error Response: [9] Application startup error:panic: dial unix /cloudsql/sapling:europe-west1:sapling/.s.PGSQL.5432: connect: no such file or directory我嘗試將 Postgres 實例從版本 11 Beta 降級到 9.6。還嘗試過使用這個驅(qū)動程序https://github.com/broady/gae-postgres，這看起來很有希望，但我無法在 Flex 環(huán)境中工作。應(yīng)用程序.yamlruntime: go#Here we select the AppEngine Flex environment which performs a lot of the backend preparation for us including the ability to scale give the demandenv: flexenv_variables:  POSTGRES_CONNECTION: "user=postgres password=thisisntmypwd dbname=postgres host=/cloudsql/sapling:europe-west1:sapling"manual_scaling:  instances: 1#Select resource sizeresources:  cpu: 1  memory_gb: 0.5  disk_size_gb: 10beta_settings:  cloud_sql_instances: sapling:europe-west1:sapling=tcp:5432配置/db.gopackage configimport (    "database/sql"    "fmt"    _ "github.com/lib/pq"    "os")var Db *sql.DB//Set up connection to the databasefunc init() {    var err error    datastoreName := os.Getenv("POSTGRES_CONNECTION")    Db, err = sql.Open(        "postgres",        datastoreName,        )    if err != nil {        panic(err)    }    err = Db.Ping()    if err != nil {        panic(err)    }    fmt.Println("Connected to database")}