批处理：带有 IF ELSE 的 FOR 循环

Question

我需要一些帮助。我想用 if-else 语句执行 for 循环，但出现了一些错误。这是我的代码

mysql -u%UserName% -N -B -e "SHOW DATABASES LIKE '%%sample%%';" | FOR /F %%D IN ('C:\Windows\System32\findstr /V "information_schema performance_schema"') DO (IF EXIST %pathx%\%%D (echo test) ELSE (echo fail))

输出为

< was unexpected at this time

Answer 1

您的错误报告不正确。您收到的输出是

( was unexpected at this time

您无法将输出有效地传送到 for 语句中。将您的代码更改为

FOR /F %%D IN ('mysql -u%UserName% -N -B -e "SHOW DATABASES LIKE '%%sample%%';" ^| C:\Windows\System32\findstr /V "information_schema performance_schema"') DO (IF EXIST %pathx%\%%D (echo test) ELSE (echo fail))

批处理：带有 IF ELSE 的 FOR 循环

BATCH: FOR LOOP with IF ELSE

for-loop

if-statement

batch-file