How to Avoid the 'Database is Locked' Error in Go's SQLite3?

Handling "Database is Locked" Error in SQLite3 with Go

When working with SQLite3 databases in Go, users may encounter the "database is locked" error. This error suggests the presence of multiple concurrent threads attempting to access the same database file.

To resolve this issue, ensure that only a single connection to the database is maintained within your program. While closing query results is essential, it's also crucial to consider the creation of multiple database file handles.

The following code snippet demonstrates the problem:

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
    }

    defer rows.Close() // Deferring the rows.Close() helps resolve the issue

    if rows.Next() {
        ...
    }
    rows.Close()
    //some insert queries
    tx.Commit()
}

Note the addition of defer rows.Close() within the dosomething function. This ensures that the database file handle is released promptly, preventing the creation of multiple handles.

By following this approach, you can effectively manage SQLite3 database connections in Go and avoid the "database is locked" error.

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