在 python 3 中使用 subprocess.check_call 运行 Oracle DBCA

Question

I want to run Oracle DBCA to create a database in silent mode. The command I want to run via Python script is the following one:

dbca -silent -createDatabase -templateName General_Purpose.dbc -gdbName testdb -sid testdb -createAsContainerDatabase false -emConfiguration NONE -datafileDestination /u01/data/oracle/testdb/db_files -storageType FS -characterSet AL32UTF8 -totalMemory 2048 -recoveryAreaDestination /u01/app/oracle/fast_recovery_area

If I run that command directly from the bash console it runs perfectly. Now I want to adapt it to be ran from a python script so I did the following:

subprocess.check_call(['dbca', '-silent', '-createDatabase', '-templateName', 'General_Purpose.dbc', '-gdbName', gdbName, '-sid', sid, '-createAsContainerDatabase', 'false', '-emConfiguration', 'NONE', '-datafileDestination', dfDest, '-storageType', storageType, '-characterSet', 'AL32UTF8', '-totalMemory', totalMemory, '-recoveryAreaDestination', recoAreaDest])

Not all of the arguments have single quotes and that's because I'm passing some variables as arguments. My variables are the following ones:

#### VARIABLES ####
gdbName = ""
sid = ""
#dfDest = ""
storageType = "FS"
totalMemory = "2048"
recoAreaDest = oracle_base + "/fast_recovery_area"

#### USER INPUTS ####
while gdbName == "":
    gdbName = input("\n" + "Global DB name: ")
while sid == "":
    sid = input("SID: ")
dfDest = "/u01/data/oracle/" + sid + "/db_files"
dfDest = input("Datafile destination [" + dfDest + "]: ")
storageType = input("Storage type [" + storageType + "]: ")
totalMemory = input("Total Memory (in MB) [" + totalMemory + "]: ")
recoAreaDest = input("Fast recover area [" + recoAreaDest + "]: ")

So when I run my script the following error occurs:

[oracle@dataguard-test-primary ~]$ ./oracle_silent_install.py

1. Install Software
2. Create Database
     Option: 2


Oracle Database Creation script
Please enter the required info...


Global DB name: d
SID: d
Datafile destination [/u01/data/oracle/d/db_files]:
Storage type [FS]:
Total Memory (in MB) [2048]:
Fast recover area [/u01/app/oracle/fast_recovery_area]:
java.lang.NullPointerException
        at oracle.install.commons.swing.StandardDialog$ErrorDialogShowTask.call(StandardDialog.java:567)
        at oracle.install.commons.swing.StandardDialog$ErrorDialogShowTask.call(StandardDialog.java:516)
        at java.util.concurrent.FutureTask.run(FutureTask.java:266)
        at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:311)
        at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:756)
        at java.awt.EventQueue.access$500(EventQueue.java:97)
        at java.awt.EventQueue$3.run(EventQueue.java:709)
        at java.awt.EventQueue$3.run(EventQueue.java:703)
        at java.security.AccessController.doPrivileged(Native Method)
        at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:76)
        at java.awt.EventQueue.dispatchEvent(EventQueue.java:726)
        at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:201)
        at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:116)
        at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:105)
        at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:101)
        at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:93)
        at java.awt.EventDispatchThread.run(EventDispatchThread.java:82)
[oracle@dataguard-test-primary ~]$

Answer 1

Solved it.

At the user input section, when trying to just hit 'enter' to pick the default value, the variable was being replaced with the value null because it read nothing, so I added an if after each user input to verify if the user just hit Enter and then fill the variable again with the default value.