Cassandra - 數據操作 - 增刪改查

0. 建表

CREATE TABLE test01.t_test (
    id int PRIMARY KEY,
    col1 text,
    col2 date
);

1. 增加數據

INSERT INTO <tablename>
(<column1 name>, <column2 name>....)
VALUES (<value1>, <value2>....)
USING <option>

cqlsh:test01> insert into test01.t_test (id , col1 , col2 ) VALUES ( 1, 'abc', '2019-09-27');
cqlsh:test01> insert into test01.t_test (id , col1 , col2 ) VALUES ( 2, 'abc', '2019-09-27');
cqlsh:test01> insert into test01.t_test (id , col1 , col2 ) VALUES ( 3, 'abc', '2019-09-27');
cqlsh:test01> select * from t_test ;
 id | col1 | col2
----+------+------------
  1 |  abc | 2019-09-27
  2 |  abc | 2019-09-27
  3 |  abc | 2019-09-27

2. 更改數據

UPDATE <tablename>
SET <column name> = <new value>
<column name> = <value>....
WHERE <condition>

cqlsh:test01> UPDATE t_test SET col1 = 'ABC' , col2 = '2019-09-26' WHERE id = 3;
cqlsh:test01> SELECT * FROM t_test ;
 id | col1 | col2
----+------+------------
  1 |  abc | 2019-09-27
  2 |  abc | 2019-09-27
  3 |  ABC | 2019-09-26

3. 查詢數據

SELECT FROM <tablename>
SELECT FROM <table name> WHERE <condition>;
SELECT FROM <table name> WHERE <condition> ORDER BY <>;

cqlsh:test01> SELECT * FROM t_test ;
 id | col1 | col2
----+------+------------
  1 |  abc | 2019-09-27
  2 |  abc | 2019-09-27
  3 |  ABC | 2019-09-26

4. 刪除數據

DELETE FROM <identifier> WHERE <condition>;

cqlsh:test01> DELETE from t_test where id =3;
cqlsh:test01> SELECT * FROM t_test ;
 id | col1 | col2
----+------+------------
  1 |  abc | 2019-09-27
  2 |  abc | 2019-09-27
(2 rows)

cqlsh:test01> DELETE col2 FROM t_test WHERE id = 2;
cqlsh:test01> SELECT * FROM t_test ;
 id | col1 | col2
----+------+------------
  1 |  abc | 2019-09-27
  2 |  abc |       null