问题
I am trying to execute the CQL commands from shell script. I am able to connect to the cqlsh (CQL version i'm using is 1.1.18) but unable to send the queries to cql.
Any ideas or suggestion how to proceed on this? Do I need to connect to Cassandra and execute few commands (select/update ) with shell script ??
回答1:
cqlsh -e "select * from ks.table limit 1;" > ~/output
回答2:
I'm not sure about Cassandra 1.1.18, but you should be able to accomplish this with the -f flag of cqlsh. Let's say have a file of CQL commands called "commands.cql". I can invoke those commands against my local Cassandra instance like this:
$ cqlsh -f commands.cql -u myusername -p mypassword localhost
If I wanted to invoke that from within a Bash script, the script's code would look something like this:
#!/bin/bash
cqlsh -f commands.cql -u myusername -p mypassword localhost
Save that as an executable file, and run it like any other.
回答3:
Need to connect to cassandra and execute few commands (select / update ) with shell script
You can execute your commands with shell script in next way:
echo "some QUERY; exit" | cqlsh CASSANDRA_HOST -u 'USER' -p 'PASS'
回答4:
The "exit" command in the last suggestion is a bit hacky.
I would propose using xargs with cqlsh -e.
echo "some QUERY;" | xargs cqlsh CASSANDRA_HOST -u 'USER' -p 'PASS' -e
I recently had to use this approach when working with docker, because clqsh -f was not an option (too complex to configure access to the file needed).
回答5:
echo "some QUERY;" | xargs cqlsh CASSANDRA_HOST -u 'USER' -p 'PASS' -e
But what if you Cassandra instance is on a different server to where the shell script is being executed? (Specifically in StreamSets - wouldn't the above require Cassandra installed on the same server such that it has access to the cqlsh lib?)
来源：https://stackoverflow.com/questions/25286253/executing-cql-through-shell-script