postgresql - how to create backup of postgres database using java -

-

i want take backup of postgres database using java. using following code this
not working , not generating dump.

string pgdump = "c:\\program files\\postgresql\\9.2\\bin\\pg_dump";           string dumpfile = "d:\\test\\"+ tenant.gettenantastemplate()+".sql";           string sql = pgdump+" -h localhost -u postgres -p postgres " + tenant.gettenantastemplate()+" > "+dumpfile;           process p = runtime.getruntime().exec(sql);           int time = p.waitfor();           system.out.println("time "+time);           if(time == 0){             system.out.println("backup created");           }           else{             system.out.println("fail create backup");           }

here getting time 1.

this operating system dependent , need pg_dump. there other way generate backup of database without pg_dump?

please reply soon.

no, there no way generate database backup without pg_dump, using regular sql connection. it's bit of faq, people want feature never step work implement feature in postgresql.

i guess technically use replication connection physical base backup pg_basebackup does, that's not want, requires copying databases on machine, , lot of work.

you should use string[] form of runtime.exec i mentioned in related answer regarding pg_restore.

you must check process exit value see if terminated or not, , must careful handle, not swallow, exceptions thrown.

your code fails check exit value, , think it's generating malformed command that's failing non-zero exit code, because not correctly quoting path pg_dump. see what's wrong, print final assembled command line, you'll see like:

c:\program files\postgresql\9.2\bin\pg_dump -h localhost ....

which cmd.exe split into:

c:\program files\postgresql\9.2\bin\pg_dump -h localhost

... etc

see problem?

do not quote path pg_dump work around this. use string[] form of exec , won't have to, plus it'll work correctly other things accidental %environmentvars% in paths.


Comments

Post a Comment

Popular posts from this blog

python - Subclassed QStyledItemDelegate ignores Stylesheet -

-
i'm trying subclass qstyleditemdelegate remove focus rectangle in qcombobox . even though i'm calling base implementation of paint function , nothing else, result different. looks if parts of style-sheet influence bounding box of item taken consideration. class pstyleditemdelegate(qstyleditemdelegate): def __init__(self, *args, **kwds): super(pstyleditemdelegate, self).__init__(*args, **kwds) def paint(self, *args, **kwargs): qstyleditemdelegate.paint(*args, **kwargs) what have paint unmodified qstyleditemdelegate ? as suggested tried replacing pyside pyqt4 , works, appears bug. update pyside 1.1.2 1.2.1 result same. unfortunately switch breaks other parts of code, if there no other suggestions i'm going accept answer. edit bug tracked here
Read more

java - HttpClient 3.1 Connection pooling vs HttpClient 4.3.2 -

-
i have used httpclient3.1(java) connection pooling below : import org.apache.commons.httpclient.httpclient; import org.apache.commons.httpclient.multithreadedhttpconnectionmanager; import org.apache.commons.httpclient.params.httpclientparams; import org.apache.commons.httpclient.params.httpmethodparams; import org.apache.log4j.logger; public class httpclientmanager { private static logger logger = logger.getlogger(httpclientmanager.class); private static multithreadedhttpconnectionmanager connectionmanager = new multithreadedhttpconnectionmanager(); private static httpclientparams clientparams = new httpclientparams(); static { try { clientparams.makelenient(); clientparams.setauthenticationpreemptive(false); clientparams.setparameter(httpmethodparams.so_timeout, new integer(30000)); // set so_timeout clientparams.setparameter(httpmethodparams.head_body_check_timeout, new integer(3000)); // head responses ...
Read more

node.js - StackOverflow API not returning JSON -

-
i using node.js script gather data stackoverflow. know responses gzipped, put code in should take care of that. script follows: var request = require('request'); var zlib = require('zlib'); function getstackoverflowresponse(url, callback){ request(url, {encoding: null}, function(err, response, body){ if(response.headers['content-encoding'] == 'gzip'){ zlib.gunzip(body, function(err, dezipped) { callback(dezipped); }); } else { callback(body); } }); } var url = "https://api.stackexchange.com/docs/questions#pagesize=2&order=desc&min=2014-01-04&max=2014-02-02&sort=activity&tagged=apigee&filter=default&site=stackoverflow&run=true"; getstackoverflowresponse(url, function(questions) { console.log(questions); }); instead of getting json output, i'm getting following response: buffer 0d 0a 0d 0a 0d 0a 0d 0a 3c 21 44 4f 43 54 59 50 45 20 48...
Read more