How to get last inserted ID with GO-MSSQLDB driver? - sql

Question

I gathered that SQL Server does not return last inserted id automatically and I need to do it manually with: OUTPUT INSERTED.ID within SQL insert statement.
How do I pick it up later in Go code?
The function in question is:
func (sta *state) mkLogEntry(from time.Time, to time.Time, man bool) (id int64) {
qry := "INSERT INTO ROMEExportLog(FromDate,ToDate,ExecutedAt,ExecutedManually,ExportWasSuccessful,UpdatedDaysIrregular) OUTPUT INSERTED.ID " +
"VALUES(#FromDate,#ToDate,#ExecutedAt,#ExecutedManually,#ExportWasSuccessful,#UpdatedDaysIrregular)"
res, err := sta.db.Exec(qry,
sql.Named("FromDate", from),
sql.Named("ToDate", to),
sql.Named("ExecutedAt", time.Now()),
sql.Named("ExecutedManually", man),
sql.Named("ExportWasSuccessful", false),
sql.Named("UpdatedDaysIrregular", false),
)
if err != nil {
log.Fatal(err)
}
id, err = res.LastInsertId()
if err != nil {
log.Fatal(err)
}
return
}
The res.LastInsertId() returns There is no generated identity value.

Answer 1

FOR SQL SERVER:
This may be gimmicky... But I found that using QueryRow
will run multiple queries/commands and just return the LAST row.
if err := db.QueryRow(`
INSERT INTO [TABLE] ([COLUMN]) VALUES (?);
SELECT SCOPE_IDENTITY()`,
colValue
).Scan(&id); err != nil {
panic(err)
}
As long as SELECT SCOPE_IDENTITY() is the last row returned then this essentially does what I would have expected result.LastInsertId() to do.

Answer 2

The reason for this is because PostgreSQL does not return you the last inserted id. This is because last inserted id is available only if you create a new row in a table that uses a sequence.
If you actually insert a row in the table where a sequence is assigned, you have to use RETURNING clause. Something like this: INSERT INTO table (name) VALUES("val") RETURNING id.
I am not sure about your driver, but in pq you will do this in the following way:
lastInsertId := 0
err = db.QueryRow("INSERT INTO brands (name) VALUES($1) RETURNING id", name).Scan(&lastInsertId)