bash - psql 查询文件中的换行符可能吗？

Question

我正在运行一个 bash 文件来处理一些 psql 任务。但是，我希望包含查询 (fp_query.txt) 的文本文件接受换行符以增强可读性。目前，我收到此错误:

parse error at end of line

当我维护换行符时。有没有办法让解释器忽略换行符，以便我可以将它们保留在查询文件中？

作为引用，这里是 .sh 文件:

export PGPASSFILE=.pgpass
psql -h [hostname] -d [dbname] -U [user] -f fp_query.txt

这里是 fp_query.txt:

\copy (SELECT created_at::date, COUNT(*)
    FROM ela_snapshots 
    WHERE created_at::date > CURRENT_DATE - 30 
    GROUP BY 1) to 'ELA_comp_tot_daily_sess.csv' with CSV HEADER

Answer 1

问题不是您的查询文件中有换行符，而是您在 \copy 元命令中有换行符。根据the "Meta-Commands" section of the psql documentation for PostgreSQL 9.5 :

Parsing for arguments stops at the end of the line, or when another unquoted backslash is found. An unquoted backslash is taken as the beginning of a new meta-command. The special sequence \\ (two backslashes) marks the end of arguments and continues parsing SQL commands, if any. That way SQL and psql commands can be freely mixed on a line. But in any case, the arguments of a meta-command cannot continue beyond the end of the line.

(强调我的)。如果您在交互式 psql 提示符下运行它，情况同样如此。

一种解决方法可能是 create a temporary function consisting of your query ，并让您的 \copy 元命令运行仅调用该函数的查询。