cql3

问题 I am wondering how can I achieve pagination using Cassandra. Let us say that I have a blog. The blog lists max 10 posts per page. To access next posts a user must click on pagination menu to access page 2 (posts 11-20), page 3 (posts 21-30), etc. Using SQL under MySQL, I could do the following: SELECT * FROM posts LIMIT 20,10; The first parameter of LIMIT is offset from the beginning of result set and second argument is amount of rows to fetch. The example above returns 10 rows starting from

问题 Hello I was reading the Cassandra documentation on Token Function, I am trying to achieve pagination for a Cassandra table, I am unable to understand the lines highlighted. The document speaks about the difference between k > 42 and TOKEN(k) > TOKEN(42), but I am not able to understand the "token based comparison" Looking forward for a detailed explanation of what token function does when part of a WHERE clause. 回答1: In order to understand in which partition it should put your data, C* makes

问题 Suppose I have a column family: CREATE TABLE update_audit ( scopeid bigint, formid bigint, time timestamp, record_link_id bigint, ipaddress text, user_zuid bigint, value text, PRIMARY KEY ((scopeid, formid), time) ) WITH CLUSTERING ORDER BY (time DESC) With two secondary indexes, where record_link_id is a high-cardinality column: CREATE INDEX update_audit_id_idx ON update_audit (record_link_id); CREATE INDEX update_audit_user_zuid_idx ON update_audit (user_zuid); According to my knowledge

问题 I am trying to create a WIDE Column Table, 20,000+ columns Initially I was thinking I would use: CREATE TABLE details ( key TEXT, detail map<TEXT, TEXT> PRIMARY KEY (KEY) ); Inserting into this table works fine UPDATE details SET detail = detail + { 'col1': '12'} where key='123' ; UPDATE details SET detail = detail + { 'col20000': 'ABCD'} where key='123' ; However, I would like to read an individual detail: select detail[col1] where key='123' when executing this query I get the following