I'm trying to connect Golang to a Postgres DB, it is in Gcloud and I already allowed the network IP. I'm trying to access the User DB and then the User table inside the public schema, this is the database structure:

I am getting this error: pq: database "Users" does not exist

I'll add the code:

package ports

import (
    "database/sql"
    "log"

    "github.com/gofiber/fiber/v2"
    _ "github.com/lib/pq"
)

func OpenConnection(dbName string) (*sql.DB, error) {
    connStr := "<addr>"   dbName
    db, err := sql.Open("postgres", connStr)

    if err != nil {
        log.Fatal(err)
    }

    return db, err
}

func GetUsers(ctx *fiber.Ctx) error {
    db, dbErr := OpenConnection("Users")

    if dbErr != nil {
        log.Fatalln(dbErr)
    }

    defer db.Close()
    rows, err := db.Query("SELECT * FROM Users")

    if err != nil {
        log.Fatalln(err)
        ctx.JSON("An error ocurred")
    }

    defer rows.Close()

    return ctx.Render("/users", fiber.Map{
        "Users": rows,
    })
}

CodePudding user response：

I just fixed it and it was a combination of two things:

1. I wasn't properly combining the strings, when I hardcoded it I got rid of the db error.
2. After that I encountered an error where it would say the table doesn't exists, the issue is I was sending an unquote table name and I needed it to be case sensitive so I had to wrap the name between quotes to make it work. Like so

package ports

import (
    "database/sql"
    "log"

    "github.com/gofiber/fiber/v2"
    _ "github.com/lib/pq"
)

func OpenConnection() (*sql.DB, error) {
    connStr := "<connStr>/users"
    db, err := sql.Open("postgres", connStr)

    if err != nil {
        log.Fatal(err)
    }

    return db, err
}

func GetUsers(ctx *fiber.Ctx, db *sql.DB) error {

    defer db.Close()
    rows, err := db.Query(`SELECT * FROM "Users"`)

    if err != nil {
        log.Fatalln(err)
        ctx.JSON("An error ocurred")
    }

    defer rows.Close()

    return ctx.Render("/users", fiber.Map{
        "Users": rows,
    })
}