cassandra命令行操作

cassandra命令⾏操作
查看cqlsh命令帮助
root@sitewhere-cassandra-0:/# cqlsh --help
Usage: cqlsh.py [options] [host [port]]
CQL Shell for Apache Cassandra
Options:
--version show program's version number and exit
-h, --help show this help message and exit
-C, --color Always use color output
--no-color Never use color output
--browser=BROWSER The browser to use to display CQL help, where BROWSER
can be:
- one of the supported browsers in
https:///2/library/webbrowser.html.
- browser path followed by %s, example: /usr/bin
/google-chrome-stable %s
--ssl Use SSL
--no_compact No Compact
-u USERNAME, --username=USERNAME
Authenticate as user.
-p PASSWORD, --password=PASSWORD
Authenticate using password.
-k KEYSPACE, --keyspace=KEYSPACE
Authenticate to the given keyspace.
-f FILE, --file=FILE Execute commands from FILE, then exit
--debug Show additional debugging information
--encoding=ENCODING Specify a non-default encoding for output. (Default:
utf-8)
--cqlshrc=CQLSHRC Specify an alternative cqlshrc file location.
--cqlversion=CQLVERSION
Specify a particular CQL version, by default the
highest version supported by the server will be used.
Examples: "3.0.3", "3.1.0"
--protocol-version=PROTOCOL_VERSION
Specify a specific protcol version otherwise the
client will default and downgrade as necessary
-e EXECUTE, --execute=EXECUTE
Execute the statement and quit.
--connect-timeout=CONNECT_TIMEOUT
Specify the connection timeout in seconds (default: 5
seconds).
--request-timeout=REQUEST_TIMEOUT
Specify the default request timeout in seconds
(default: 10 seconds).
-t, --tty Force tty mode (command prompt).
Connects to 127.0.0.1:9042 by default. These defaults can be changed by
setting $CQLSH_HOST and/or $CQLSH_PORT. When a host (and optional port number)
are given on the command line, they take precedence over any defaults.
连接数据库
root@sitewhere-cassandra-0:/# cqlsh
Connected to cassandra at 127.0.0.1:9042.
[cqlsh 5.0.1 | Cassandra 3.11.3 | CQL spec 3.4.4 | Native protocol v4]
Use HELP for help.
cqlsh>
查看帮助
cqlsh> help
Documented shell commands:
===========================
CAPTURE CLS COPY DESCRIBE EXPAND LOGIN SERIAL SOURCE UNICODE
CLEAR CONSISTENCY DESC EXIT HELP PAGING SHOW TRACING
CQL help topics:
================
AGGREGATES CREATE_KEYSPACE DROP_TRIGGER TEXT
ALTER_KEYSPACE CREATE_MATERIALIZED_VIEW DROP_TYPE TIME
ALTER_MATERIALIZED_VIEW CREATE_ROLE DROP_USER TIMESTAMP
ALTER_TABLE CREATE_TABLE FUNCTIONS TRUNCATE
ALTER_TYPE CREATE_TRIGGER GRANT TYPES
ALTER_USER CREATE_TYPE INSERT UPDATE
APPLY CREATE_USER INSERT_JSON USE
ASCII DATE INT UUID
BATCH DELETE JSON
BEGIN DROP_AGGREGATE KEYWORDS
BLOB DROP_COLUMNFAMILY LIST_PERMISSIONS
BOOLEAN DROP_FUNCTION LIST_ROLES
COUNTER DROP_INDEX LIST_USERS
CREATE_AGGREGATE DROP_KEYSPACE PERMISSIONS
CREATE_COLUMNFAMILY DROP_MATERIALIZED_VIEW REVOKE
CREATE_FUNCTION DROP_ROLE SELECT
CREATE_INDEX DROP_TABLE SELECT_JSON
连续两个Tab键
cqlsh>
BEGIN CLEAR CONSISTENCY CREATE DELETE DESCRIBE EXPAND HELP LIST PAGING SELECT SHOW TRACING UPDATE exit ALTER CAPTURE CLS COPY DEBUG DESC DROP GRANT INSERT LOGIN REVOKE SERIAL SOURCE TRUNCATE USE quit
查询有哪些keyspace
cqlsh> DESC KEYSPACES
system_traces system_schema system_auth system system_distributed
选择keyspace
cqlsh> use system_schema ;
cqlsh:system_schema>
查看tables
cqlsh:system_schema> desc tables;
tables triggers views keyspaces dropped_columns
functions aggregates indexes types columns
cqlsh:system_schema>
查询数据
cqlsh:system_schema> select * from keyspaces;
keyspace_name | durable_writes | replication
--------------------+----------------+-------------------------------------------------------------------------------------
system_auth | True | {'class': 'org.apache.cassandra.locator.SimpleStrategy', 'replication_factor': '1'}
system_schema | True | {'class': 'org.apache.cassandra.locator.LocalStrategy'}
system_distributed | True | {'class': 'org.apache.cassandra.locator.SimpleStrategy', 'replication_factor': '3'}
system | True | {'class': 'org.apache.cassandra.locator.LocalStrategy'}
system_traces | True | {'class': 'org.apache.cassandra.locator.SimpleStrategy', 'replication_factor': '2'}
(5 rows)
cqlsh:system_schema> select * from keyspaces where keyspace_name='system_auth';//注意不能⽤双引号，不然语法错误 keyspace_name | durable_writes | replication
---------------+----------------+-------------------------------------------------------------------------------------
system_auth | True | {'class': 'org.apache.cassandra.locator.SimpleStrategy', 'replication_factor': '1'}
(1 rows)
增删改查和mysql的语句差不多。