Cassandra :
CREATE TABLE student (firstName text , lastName text, score int, PRIMARY KEY (firstName))
Java :
@PartitionKey
private String firstName;
@Column(name = "lastName")
private String lastName;
@Column(name = "score")
private int score;
2个Primary Key
Cassandra :
CREATE TABLE student (firstName text , lastName text, score int, PRIMARY KEY (firstName, lastName))
Java :
@PartitionKey(0)
private String firstName;
@PartitionKey(1)
private String lastName;
@Column(name = "score")
private int score;
查询：
select * from student where firstName = "*"; ✘
select * from student where lastName = "*"; ✖︎
select * from student where firstName ="*" and lastName ="*"; ✔︎
@PartitionKey
private String firstName;
@ClusteringColumn
private String lastName;
@Column(name = "score")
private int score;
查询：
select * from student where firstName = "*"; ✔︎
select * from student where lastName = "*"; ✖︎
select * from student where firstName ="*" and lastName ="*"; ✔︎