Cassandra spring data 試用

1. maven  依賴

1. <dependency>
2. <groupId>org.springframework.data</groupId>
3. <artifactId>spring-data-cassandra</artifactId>
4. </dependency>
5. <dependency>
6. <groupId>org.springframework.data</groupId>
7. <artifactId>spring-cql</artifactId>
8. </dependency>

 

2. 創建 Cassandra  keysapce，表定義

1. CREATE KEYSPACE dalong WITH replication = {'class': 'SimpleStrategy', 'replication_factor': 1};
2. CREATE TABLE userapp(user_id text PRIMARY KEY ,firstname text ,lastname text );

 

3. 實體映射定義

 

1. package com.yonyou.op.Enties;
3. import java.io.Serializable;
5. import org.springframework.data.cassandra.mapping.PrimaryKey;
6. import org.springframework.data.cassandra.mapping.Table;
8. @Table(value = "userapp")
9. public class Person implements Serializable{
10. private static final long serialVersionUID = 1L;
11. @PrimaryKey
12. private String user_id;
13. private String firstname;
14. private String lastname;
15. public Person() {
16. // TODO Auto-generated constructor stub
17. }
18. public Person(String id, String name, String age) {
19. this.user_id = id;
20. this.firstname = name;
21. this.lastname = age;
22. }
23. public String getUser_id() {
24. return user_id;
25. }
26. public String getFirstname() {
27. return firstname;
28. }
29. public String getLastname() {
30. return lastname;
31. }
32. @Override
33. public String toString() {
34. return "Person [user_id=" + user_id + ", firstname=" + firstname
35. + ", lastname=" + lastname + "]";
36. }
38. }

4. 添加，查詢代碼

 

1. public class Appdemo2 {
2. private static final Logger LOGGER = LoggerFactory
3. .getLogger(Appdemo2.class);
4. protected static Person newPerson(String name, String age) {
5. return newPerson(UUID.randomUUID().toString(), name, age);
6. }
7. protected static Person newPerson(String id, String name, String age) {
8. return new Person(id, name, age);
9. }
10. public static void main(String[] args) {
11. Cluster cluster = Cluster.builder().addContactPoints("XXXXXX")
12. .build();
13. Session session = cluster.connect("dalong");
14. CassandraOperations template = new CassandraTemplate(session);
15. Person jonDoe = template.insert(newPerson("Jon Doe", "dddd"));
16. Select selectStatement = QueryBuilder.select()
17. .from("dalong", "userapp");
18. selectStatement.allowFiltering();
19. selectStatement
20. .where(QueryBuilder.eq("lastname", jonDoe.getLastname()));
21. List<Person> selectpersons = template.select(selectStatement,
22. Person.class);
23. for (Person p : selectpersons) {
24. LOGGER.info(p.toString());
25. }
26. session.close();
27. cluster.close();
28. }
30. }

5. 常見問題：

 

   a. spring data  Cassandra  版本問題，目前已經支持3.0 但是需要使用新版本的spring 

       不然會出現比較怪異的問題