GAE: DataStore
고도의 확장성을 가지는 데이터 위주의 APP 개발의 어려움
Problem 1. Scalability 2. Security 3. Replication 4. maintenance
Problem 1. Scalability 2. Security 3. Replication 4. maintenance
Problem 1. Scalability 2. Security 3. Replication 4. maintenance
Problem 1. Scalability 2. Security 3. Replication 4. maintenance
Google App Engine 1. Distribution 2. Replication 3. Load Balancing 4. BigTable+GFS
Google App Engine 1. Distribution 2. Replication 3. Load Balancing 4. BigTable+GFS
Google App Engine 1. Distribution 2. Replication 3. Load Balancing 4. BigTable+GFS
Google App Engine 1. Distribution 2. Replication 3. Load Balancing 4. BigTable+GFS
Entity N >= 0 Attribute
1 Identifier
Attribute Value Internal Class
Child Object Complex Type
Main Key Field Type Long String without Encoding
Key String with Encoding
Key 가 중복되면 데이터는 OverWrite 된다.
Creating jdoconfig.xml
Setting the Read Policy and Datastore Call Deadline
Getting a PersisitenceManager Instance
Query In JDO
Thank You!