Sqlite3 error: database is locked in golang

Question

I am using the sqlite3 database in golang and I got the error: "database is locked."

I know that there cannot be multiple threads using the same database file.

Although I get only one connection in my program and close all query results, it always creates 2 or 3 database file descriptors.

I check this clouds using the opendfileview program.

Can someone help me with this problem. Thanks in advance.

The following code creates two database file descriptors.

func main() {
    database, tx, err := getDatabaseHandle()
    if err != nil {
        log.Fatal(err)
    }
    defer database.Close()
    dosomething(database, tx)
}
func dosomething(database *sql.DB, tx *sql.Tx) error {
    rows, err := database.Query("select * from sometable where name=?","some")
    if err != nil {
        return err
    }
    if rows.Next() {
        ...
    }
    rows.Close()
    //some insert queries
    tx.Commit()
}
func getDatabaseHandle() (*sql.DB, *sql.Tx, error) {
    database, err := sql.Open("sqlite3", dbPath)
    if err != nil {
        fmt.Println("Failed to create the handle")
        return nil, nil, err
    }
    if err2 := database.Ping(); err2 != nil {
        fmt.Println("Failed to keep connection alive")
        return nil, nil, err
    }
    tx, err := database.Begin()
    if err != nil {
        return nil, nil, err
    }
    return database, tx, nil
}

Answer 1

Try to delay rows.Close():

if err != nil {
    return err
}
defer rows.Close()
if rows.Next() {
    ...
}