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: aindexcomposite.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"
)

// AIndexComposite represents a row from 'a_bit_of_everything.a_index_composite'.
type AIndexComposite struct {
	AKey1 sql.NullInt64 `json:"a_key1"` // a_key1
	AKey2 sql.NullInt64 `json:"a_key2"` // a_key2
}

// AIndexCompositeByAKey1AKey2 retrieves a row from 'a_bit_of_everything.a_index_composite' as a [AIndexComposite].
//
// Generated from index 'a_index_composite_idx'.
func AIndexCompositeByAKey1AKey2(ctx context.Context, db DB, aKey1, aKey2 sql.NullInt64) ([]*AIndexComposite, error) {
	// query
	const sqlstr = `SELECT ` +
		`a_key1, a_k
    
func AIndexCompositeByAKey1AKey2(ctx context.Context, db DB, aKey1, aKey2 sql.NullInt64) ([]*AIndexComposite, error) {
	// query
	const sqlstr = `SELECT ` +
		`a_key1, a_key2 ` +
		`FROM a_bit_of_everything.a_index_composite ` +
		`WHERE a_key1 = ? AND a_key2 = ?`
	// run
	logf(sqlstr, aKey1, aKey2)
	rows, err := db.QueryContext(ctx, sqlstr, aKey1, aKey2)
	if err != nil {
		return nil, logerror(err)
	}
	defer rows.Close()
	// process
	var res []*AIndexComposite
	for rows.Next() {
		aic := AIndexComposite{}
		// scan
		if err := rows.Scan(&aic.AKey1, &aic.AKey2); err != nil {
			return nil, logerror(err)
		}
		res = append(res, &aic)
	}
	if err := rows.Err(); err != nil {
		return nil, logerror(err)
	}
	return res, nil
}