Gorm With Postgres Too Many Client Issue - postgresql

Question

I have my database connection in my admin package setup like this,
Template File:
type Template struct{}
func NewAdmin() *Template {
return &Template{}
}
Database File:
type Database struct {
T *Template
}
func (admin *Database) DB() *gorm.DB {
db, err := gorm.Open("postgres", "host=localhost port=5010 user=postgres dbname=postgres password=password sslmode=disable")
if err != nil {
panic(err)
}
return db
}
Now I using that connection in my controllers package, like so
Controller Teamplate
type Template struct {
Connection *admin.Database
}
Profile File:
type ProfilesController struct {
T *Template
}
func (c *ProfilesController) ProfileList(ec echo.Context) error {
profile := []models.Profile{}
c.T.Connection.DB().Find(&profile)
if len(profile) <= 0 {
reply := map[string]string{"Message": "No Profiles Found", "Code": "204"}
return ec.JSON(http.StatusBadRequest, reply)
}
return ec.JSON(http.StatusOK, profile)
}
Now this was all working fine but I have now move on to building the frontend to this api. I am getting pq: sorry, too many clients already after about 96 or so requests.
So I run it though postman and got the same result. This is what I have done to correct the issue,
db := *c.T.Connection.DB()
db.Find(&profile)
defer db.Close()
Now that seems to work, I push over 500 requests though with postman and it worked fine. I am guest its the db.Close() that is helping there.
But I have read that the connection is a pool, so should the orginal code not work without needed a close on the connection? I thought that idle connections were released by the system over it was done with them? I have also read that due to it being a pool its not good to use db.Close().
So I am a little confused? Is what I done to fix the connection issue good? or is there a better way?
Many thanks.

Answer 1

You need to just create the one connection, and return the same instance:
type Database struct {
T *Template
}
var db *gorm.DB
func init() {
var err error
db, err = gorm.Open("postgres", "host=localhost port=5010 user=postgres dbname=postgres password=password sslmode=disable")
if err != nil {
panic(err)
}
}
func (admin *Database) DB() *gorm.DB {
return db
}