问psql -读取SQL文件并输出到CSV

EN

CONN="psql -U my_user -d my_db"
QUERY="$(sed 's/;//g;/^--/ d;s/--.*//g;' my_query.sql | tr '\n' ' ')"

echo "\\copy ($QUERY) to 'out.csv' with CSV HEADER" | $CONN

-- my_query.sql
select *
from my_table
where timestamp < current_date -- only want today's records
limit 10;

select * from my_table where timestamp < current_date limit 10

\copy (select * from my_table where timestamp < current_date) to 'out.csv' with csv header

#!/bin/bash
# sql_to_csv.sh

CONN="psql -U my_user -d my_db"
QUERY="$(sed 's/;//g;/^--/ d;s/--.*//g;' $1 | tr '\n' ' ')"
echo "$QUERY"

echo "\\copy ($QUERY) to '$2' with csv header" | $CONN > /dev/null

psql -U my_user -d my_db -c "COPY ($(cat my_query.sql)) TO STDOUT WITH CSV HEADER" > my_query_results.csv

#!/bin/bash

# Takes an sql query file as an argument and dumps its results
# to a CSV file using psql \copy command.
#
# Usage:
#
#  dump_query_to_csv.sh <sql_query_file> [<csv_output_filesname>]

SQL_FILE=$1
[ -z $SQL_FILE ] && echo "Must supply query file" && exit
shift

OUT_FILE=$1
[ -z $OUT_FILE ] && OUT_FILE="output.csv" # default to "output.csv" if no argument is passed

TMP_TABLE=ttt_temp_table_xx # some table name that will not collide with existing tables

## Build a psql script to do the work
PSQL_SCRIPT=temp.psql

# create a temporary database table using the SQL from the query file
echo "DROP TABLE IF EXISTS $TMP_TABLE;CREATE TABLE $TMP_TABLE AS" > $PSQL_SCRIPT
cat $SQL_FILE >> $PSQL_SCRIPT
echo ";" >> $PSQL_SCRIPT

# copy the temporary table to the output CSV file
echo "\copy (select * from $TMP_TABLE) to '$OUT_FILE' with csv header" >> $PSQL_SCRIPT

# drop the temporary table
echo "DROP TABLE IF EXISTS $TMP_TABLE;" >> temp.sql

## Run psql script using psql
psql my_database < $PSQL_SCRIPT # replace my_database and add user login credentials as necessary

## Remove the psql script
rm $PSQL_SCRIPT