如何使用java代码在cassandra中插入java列表值？

Question

我的cassandra DB结构：

CREATE TABLE devjavasource.userorders (
user_id text PRIMARY KEY,
name text,
rlist list<text>
) WITH bloom_filter_fp_chance = 0.01
AND caching = {'keys': 'ALL', 'rows_per_partition': 'NONE'}
AND comment = ''
AND compaction = {'class': 'org.apache.cassandra.db.compaction.SizeTieredCompactionStrategy', 'max_threshold': '32', 'min_threshold': '4'}
AND compression = {'chunk_length_in_kb': '64', 'class': 'org.apache.cassandra.io.compress.LZ4Compressor'}
AND crc_check_chance = 1.0
AND dclocal_read_repair_chance = 0.1
AND default_time_to_live = 0
AND gc_grace_seconds = 864000
AND max_index_interval = 2048
AND memtable_flush_period_in_ms = 0
AND min_index_interval = 128
AND read_repair_chance = 0.0
AND speculative_retry = '99PERCENTILE';

我的代码：

import com.datastax.driver.core.*;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;

public class cassandraList
{

    public static void main(String[] args) {
        Cluster cluster = null;
        Session session = null;
        cluster = cluster.builder().addContactPoint("192.168.1.23").build();
        List<String> list= new ArrayList<String>();
        list.add("[e-mail]");
        list.add("[e-mail]");

        session = cluster.connect("devjavasource");

        System.out.println("test :" +list);

        Statement st = new SimpleStatement("INSERT INTO USERS (user_id, name, Rlist) VALUES ('11101', 'john', "+list+");");

        System.out.println("query :" +"INSERT INTO USERS (user_id, name, Rlist) VALUES ('11101', 'john', "+routing_points+");");
        ResultSet rs = session.execute(st);
    }

我有一个错误，所以从print语句中获取查询，如下所示：

  INSERT INTO USERS (user_id, name, Rlist) VALUES ('11101', 'john', [AUE, SAN, UK, LON]);

然后我手动运行此查询到cql，得到以下错误：

语法异常：

Answer 1

由于您的列表由字符串组成，因此这应该可以做到：

INSERT INTO USERS (user_id, name, Rlist) VALUES ('11101', 'john', ['AUE', 'SAN', 'UK', 'LON']);

Answer 2

使用绑定标记：

List<String> list = new ArrayList<String>(); 
list.add("[e-mail]"); 
list.add("[e-mail]"); 
Statement st = new SimpleStatement("INSERT INTO USERS (user_id, name, rlist) VALUES ('11101', 'john', ?);", list); 
ResultSet rs = session.execute(st);