批处理文件，用于将psql查询输出存储到变量中 [英] batch file to store the psql query output into a variable

问题描述

您好，我正在创建一个批处理文件以执行查询并为输出写一个日志文件.因此，根据某些条件，将执行两个查询.因此，我试图将查询的输出值存储到变量中，并使用该变量值检查条件.但是这里我面临一个问题，我应该如何假设使用psql命令声明输出值并将其存储到变量中.请帮忙！！这是我尝试过的:

Hi I am creating a batch file to execute a query and write a log file for the output. So based on some condition the there two queries to be executed. So I was trying to store a output value of a query in to a variable and use that variable value to check the condition. But here I am facing a problem that how should I suppose to declare and store output value into a variable using psql command. Please help!! Here what I tried:

SET /A a = psql -t -U postgres -d rpd -c "select count(*) from rpd.rpm_rpd_count"
SET /A b = 1

if %a% == 3 goto is_stat 
else goto is_start

REM to copy the log
:is_start  
psql -U postgres -d rpd -c "SELECT
a.table_name , 'MATCH' status  FROM rpd.rpm_rpd_count A  WHERE
a.rpd_count = a.rpm_count UNION ALL SELECT a.table_name, 'NOT MATCH'
AS status FROM rpd.rpm_rpd_count A WHERE a.rpd_count <>  a.rpm_count;" >> C:\Users\admin\Desktop\err.log
goto END
:is_stat 
psql -U postgres -d rpd -c "SELECT a.table_name , 'MATCH'
status  FROM rpd.rpm_rpd_count A  WHERE a.rpd_count = a.rpm_count;" >>
C:\Users\admin\Desktop\err.log 
goto END
:END 
echo %b% >> C:\Users\admin\Desktop\err.log

这里的问题是变量 a

推荐答案

您可以使用for循环来解析输出

You can use a for loop to parse the output

for /f %%i in ('psql -t -U postgres -d rpd -c "select count(*) from rpd.rpm_rpd_count"') do set A=%%i

(如果在命令行控制台中尝试，请使用单个％，并在批处理文件中将 %% 翻倍)

(use a single % if you try it in the command line console, and double %% in a batch file)

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