ent.go 说 sql: 数据库在任何查询上都关闭

Question

db/db.go    func DbClient(cfg *config.Config, logger log.Logger) *ent.Client {    // "host=<host> port=<port> user=<user> dbname=<database> password=<pass>"    psqlInfo := fmt.Sprintf("host=%s port=%s user=%s dbname=%s password=%s",        cfg.DB_HOST, cfg.DB_PORT, cfg.DB_USER, cfg.DB_NAME, cfg.DB_PASS)    client, err := ent.Open("postgres", psqlInfo)    if err != nil {        logger.Fatal(err)    }    defer client.Close()    logger.Info("Database Connected")    if err := client.Schema.Create(context.Background()); !errors.Is(err, nil) {        logger.Fatalf("Error: failed creating schema resources %v\n", err)    }    return client}services/userservice.gofunc CreateUser(client *ent.Client, input *model.NewUser) (*ent.User, error) {    user, err := client.Debug().User.Create().SetName(input.Name).SetUsername(input.Username).SetEmail(input.Email).SetPassword(input.Password).Save(context.Background())    if err != nil {        return &ent.User{}, err    }    return user, nil}ent 客户端创建所有必要的表并显示数据库已连接。但是当我执行CreateUser()它时它正在返回sql: database is closed。谁能告诉我为什么会这样？

Answer 1

Close您的引导代码中有一个数据库连接调用：

func DbClient(cfg *config.Config, logger log.Logger) *ent.Client {

  // "host=<host> port=<port> user=<user> dbname=<database> password=<pass>"

  psqlInfo := fmt.Sprintf("host=%s port=%s user=%s dbname=%s password=%s",

cfg.DB_HOST, cfg.DB_PORT, cfg.DB_USER, cfg.DB_NAME, cfg.DB_PASS)

  client, err := ent.Open("postgres", psqlInfo)

  if err != nil {

      logger.Fatal(err)

  }

  defer client.Close() // <- this one

  logger.Info("Database Connected")

  if err := client.Schema.Create(context.Background()); !errors.Is(err, nil) {

    logger.Fatalf("Error: failed creating schema resources %v\n", err)

  }

  return client

}

返回后此调用关闭连接client。如果需要关闭连接，请从CreateUser()func 中将其关闭。

func CreateUser(client *ent.Client, input *model.NewUser) (*ent.User, error) {

    user, err := client.Debug().User.Create().SetName(input.Name).SetUsername(input.Username).SetEmail(input.Email).SetPassword(input.Password).Save(context.Background())

    if err != nil {

        return &ent.User{}, err

    }

    defer client.Close() // <- here

    return user, nil

}