I need to execute postgresql queries from command line using psql -c command. For every psql command, it opens a new tcp connection to connect to the database server and execute query which is a overhead for large number of queries.
Currently I can execute single query like this:
psql -U postgres -h <ip_addr> -c "SELECT * FROM xyz_table;"
When I tried to execute multiple queries as below, but only the last query got executed.
psql -U postgres -h <ip_addr> -c "SELECT * FROM xyz_table; SELECT * FROM abc_table;"
Can anyone help me and tell me the proper way to do it?
-c
processes only one command. Without it however psql
expects commands to be passed into standard input, eg:
psql -U postgres -h <ip_addr> <database_name> << EOF
SELECT * FROM xyz_table;
SELECT * FROM abc_table;
EOF
Or by using echo
and pipes.
使用echo
和管道将其安装在一条线上:
echo 'SELECT * FROM xyz_table; \n SELECT * FROM abc_table' | psql -U postgres
The --file
parameter executes a file's content
psql -U postgres -h <ip_addr> -f "my_file.psql"
All the output will be sent to standard output
at least from 9.6.2 this approach works as well:
psql -c "select now()" -c "select version()" -U postgres -h 127.0.0.1
2017-12-26 20:25:45.874935+01 (1 row)
PostgreSQL 9.6.2 on x86_64-pc-linux-gnu, compiled by gcc (Ubuntu 5.3.1-14ubuntu2) 5.3.1 20160413, 64-bit (1 row)
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