将postgresql结果存储在bash变量中 [英] store postgresql result in bash variable
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问题描述
如何像下面的脚本那样在bash变量上赋予标量postgresql值?
How to atore a scalar postgresql-value on a bash-variable like in script below?
dbname="testlauf"
username="postgres"
vartest='psql -c -d $dbname -U $username -h localhost -p 5432 "SELECT gid FROM testtable WHERE aid='1';"'
echo "$vartest"
我尝试了几种不同的著作,但似乎没有任何效果。
I tried several different writings, but nothing seems to work. Thanks in advance.
推荐答案
将 -c
选项放在其前面参数-查询。注意,还可以使用附加的 -t
选项仅获取元组值。当然,请使用反引号(`)运算符。
Put the -c
option just before its argument - the query. Mind also using the additional -t
option to get just the tuple value. And of course, use the backticks (`) operator.
使用 -X
选项,因为有时 .psqlrc
文件可能会添加一些冗余输出,以及 -A
选项,该选项将禁用列对齐(空格)。
Using the -X
option is also recommended, as sometimes a .psqlrc
file might add some redundant output, as well as the -A
option, which disables column aligning (whitespaces).
vartest=`psql -X -A -d $dbname -U $username -h localhost -p 5432 -t -c "SELECT gid FROM testtable WHERE aid='1'"`
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