May 2024
Intermediate to advanced
752 pages
24h
Japanese
Content preview from Spring徹底入門 第2版 Spring FrameworkによるJavaアプリケーション開発
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11.4 MyBatis での応用的な CRUD 操作
❹
MyBatis が提供するSQL クラスとそのメソッドを使用して、SQL を組み立てる
MyBatis が提供する
SQL
クラスを使用すると、単純な文字列連結によるSQLの組み立てに比べて、
安全かつ効率的に SQLを組み立てることができます。
SQL
クラスの詳細については、MyBatis の公
式サイト
【5】
を参照してください。
1対 1と 1対多のマッピング
ここまでの説明では、取得したレコードを
1
つのオブジェクトにマッピングする方法を紹介してきました。こ
こでは、
1
対
1
や
1
対多の関連を持つテーブルからレコードを取得して、関連テーブルのレコードをネストしたオ
ブジェクトにマッピングする方法を紹介します。これを今まで説明してきた方法だけで実現しようとすると、以
下のような実装が必要になります。
ここまでの説明で紹介した方法で実現する際の実装例
//
主テーブルのレコードを取得するための
Mapper
メソッドを呼び出す。
MeetingRoom meetingRoom =
meetingRoomMapper.findOne(meetingRoomId);
//
関連テーブルのレコードを取得するための
Mapper
メソッドを呼び出す。
List<ReservableRoom> reservableRooms =
meetingRoomMapper.findReservableRooms(meetingRoomId); ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.