You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: auniqueindexcomposite.xo.go
    path of file: ./repos/xo/_examples/a_bit_of_everything/mysql
    
    the code of the file until where you have to start completion: package mysql

// Code generated by xo. DO NOT EDIT.

import (
	"context"
	"database/sql"
)

// AUniqueIndexComposite represents a row from 'a_bit_of_everything.a_unique_index_composite'.
type AUniqueIndexComposite struct {
	AKey1 sql.NullInt64 `
    
func AUniqueIndexCompositeByAKey1AKey2(ctx context.Context, db DB, aKey1, aKey2 sql.NullInt64) (*AUniqueIndexComposite, error) {
	// query
	const sqlstr = `SELECT ` +
		`a_key1, a_key2 ` +
		`FROM a_bit_of_everything.a_unique_index_composite ` +
		`WHERE a_key1 = ? AND a_key2 = ?`
	// run
	logf(sqlstr, aKey1, aKey2)
	auic := AUniqueIndexComposite{}
	if err := db.QueryRowContext(ctx, sqlstr, aKey1, aKey2).Scan(&auic.AKey1, &auic.AKey2); err != nil {
		return nil, logerror(err)
	}
	return &auic, nil
}