查看cqlsh命令帮助

root@sitewhere-cassandra-0:/# cqlsh --help

Usage: cqlsh.py [options] [host [port]]

CQL ShellforApache 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 inhttps://docs.python.org/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, thenexit--debug Show additional debugging information--encoding=ENCODING Specify a non-default encoding foroutput. (Default:

utf-8)--cqlshrc=CQLSHRC Specify an alternative cqlshrc filelocation.--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 timeoutin seconds (default: 5seconds).--request-timeout=REQUEST_TIMEOUT

Specify the default request timeoutinseconds

(default:10seconds).-t, --tty Force tty mode (command prompt).

Connects to127.0.0.1:9042by 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 at127.0.0.1:9042.

[cqlsh5.0.1 | Cassandra 3.11.3 | CQL spec 3.4.4 |Native protocol v4]

Use HELPforhelp.

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'}

(5rows)

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