partition key, composite key and clustering key in Cassandra

There is a lot of confusion around this, I will try to make it as simple as possible. The primary key is a general concept to indicate one or more columns used to retrieve data from a Table. The primary key may be SIMPLE create table stackoverflow ( key text PRIMARY KEY, data text );…

spring injection variable setter constructor

1 field.  @Autowired     private Point center; 2 setter.  @Autowired     public void setCenter(Point center) {         this.center = center;     } If you weren’t using autowiring, there is a big difference between constructor and setter injection. You write the XML differently in order to inject the dependencies. And setter injection dependencies are optional while constructor injection dependencies are…