oracle - Golang godror - 执行一个 PL/SQL 游标

Question

我正在尝试使用 godror 在 golang 中检索 PL/SQL 函数的游标结果。

https://github.com/godror/godror

Using cursors returned by stored procedures Use ExecContext and an interface{} or a database/sql/driver.Rows as the sql.Out destination, then either use the driver.Rows interface, or transform it into a regular *sql.Rows with godror.WrapRows, or (since Go 1.12) just Scan into *sql.Rows.

db, err := sql.Open("godror", "api/user@localhost/DEV")
if err != nil {
  fmt.Println(err)
  panic(err)
}
defer db.Close()

ctx, cancel := context.WithTimeout(context.Background(), 10*time.Second)
defer cancel()

const query = `
DECLARE
BEGIN
:cursor := pkg_api.my_func(pstr_logn_nm => 'my_name');
END;
`
stmt, err := db.PrepareContext(ctx, query)
if err != nil {
  fmt.Println(err)
  panic(err)
}

var rows driver.Rows
_, err = stmt.ExecContext(ctx, sql.Out{Dest: &rows})
if err != nil {
  fmt.Println(err)
}

var r []driver.Value
err = rows.Next(r)
if err != nil {
  fmt.Println(err) // column count mismatch: we have 10 columns, but given 0 destination
}
defer rows.Close()

fmt.Println(rows.Columns()) // [COL_1 COL_2 COL_3 COL_4 COL_5 COL_6 COL_7 COL_8 COL_9 COL_10]

我有一个错误:column count mismatch: we have 10 columns, but given 0 destination在我看来，这是因为我必须定义一个包含一些列的接口(interface)。

如果我尝试改变 driver.Rows通过 sql.Rows我有这个错误:

arg: unknown type sql.Rows

如果我尝试创建一个界面，我:

type I interface {
  NM() string
}

var r []I
err = rows.Next(r)

我有这个错误:cannot use r (type []I) as type []driver.Value in argument to rows.Next
如果有人有想法，我也是 Golang 的新手 :)

非常感谢!

Answer 1

这解决了我的问题!

r := make([]driver.Value, len(rows.Columns()))
err = rows.Next(r)
if err != nil {
  fmt.Println(err) // column count mismatch: we have 10 columns, but given 0 destination
}
defer rows.Close()

https://github.com/godror/godror/issues/62