dbi

问题 On my Windows 7 box, I've installed Ruby 1.9.2, and installed the following gems: * LOCAL GEMS * dbd-mysql (0.4.4) dbi (0.4.5) deprecated (2.0.1) httparty (0.8.1) rubygems-update (1.8.15) (I did this using gem install). I have also written the following simple test harness: require 'rubygems' require 'dbi' begin dbh = DBI.connect("DBI:Mysql:test", "username", "pwd") row = dbh.select_one("SELECT VERSION()") puts "Server Version: "+row[0] rescue DBI::DatabaseError => e puts "An error occurred"

问题 I am using this query with the Perl DBI: SELECT c.change_id , COLLECT(t.tag) AS the_tags FROM changes c LEFT JOIN tags t ON c.change_id = t.change_id WHERE c.project = ? GROUP BY c.change_id The DBI uses OCI to prepare this statement, bind the value I pass, and get the results. But Oracle, for some reason, does not like it. The error output is: ORA-00932: inconsistent datatypes: expected - got - (DBD ERROR: error possibly near <*> indicator at char 41 in ' SELECT c.change_id , <*>COLLECT(t

问题 My code is similar to the below: $sth = $dbh->prepare("CREATE TABLE IF NOT EXISTS ? (`id` bigint(100) unsigned NOT NULL AUTO_INCREMENT"); $sth->execute('test'); I end up with the error: ERROR 1064 (42000): You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near ''test' From the trace I found perl DBI put single quote around the table name, which mysql doesnt like. How to tell DBI not to put any quote or to put (`)

问题 I have a Postgres table with more than 8 million rows. Given the following two ways of doing the same query via DBD::Pg , I get wildly different results. $q .= '%'; ## query 1 my $sql = qq{ SELECT a, b, c FROM t WHERE Lower( a ) LIKE '$q' }; my $sth1 = $dbh->prepare($sql); $sth1->execute(); ## query 2 my $sth2 = $dbh->prepare(qq{ SELECT a, b, c FROM t WHERE Lower( a ) LIKE ? }); $sth2->execute($q); query 2 is at least an order of magnitude slower than query 1... seems like it is not using the

问题 How can i retrive the return value of stored procedure by using perl and the dbi against sql server ? could someone provide example. 回答1: There are examples in DBD::ODBC t/ dir (see 20SqlServer.t). Basically you do (not a full working example): my $output; my $input = 'fred'; my $sth = $dbh->prepare(q/{ ? = call myproc(?) }/); $sth->bind_param_inout(1, \$output, 100); $sth->bind_param(2, $input); $sth->execute Now $output should contain whatever your procedure returned. Make sure you set then

问题 How can i build a sql server 2008 datetime object with perl and insert it using the dbi module to specific table could someone provide example 回答1: If using ODBC: my $sth = $dbh->do(q/insert into mytable (mydatetimecol) values(?)/; $sth->execute(q/{ts 'yyyy-mm-dd hh:mm:ss'}/); The datetime can also have '.mmm' on the end for milliseconds. If not using ODBC it will depend on what DBD you are using. 来源： https://stackoverflow.com/questions/3044445/how-to-build-sql-server-2008-datetime-object-and

问题 I'm new to all this this stuff. I'm trying to execute the following code use DBI; my $dsn = 'DBI:mysql:db:localhost'; my $db_user_name = 'root'; my $db_password = '*******'; my $dbh = DBI->connect($dsn, $db_user_name, $db_password); my $sth = $dbh->prepare("select id from table where field = 'value'"); $sth->execute(); ($id) = $sth->fetchrow_array(); print "id is $id"; $sth->finish(); print outputs nothing. Can you tell me what am I doing wrong? Thank you in advance! 回答1: You said in one of

问题 I can easily connect to a remote MySQL server using the DBI module in my Perl scripts. However, when I try to use the same connection settings/properties from within a CGI script, the connection fails. There are no helpful errors/warnings being logged either in the apache error log, or the browser, in spite of using use CGI::Carp qw(warningsToBrowser fatalsToBrowser); Strangely, the exact same script works fine when executed from the terminal. I also tried connecting the CGI script to the

问题 sorry for my noob question, I'm currently writing a perl web application with sqlite database behind it. I would like to be able to show in my app query results which might get thousands of rows - these should be split in pages - routing should be like /webapp/N - where N is the page number. what is the correct way to query the sqlite db using DBI, in order to fetch only the relavent rows. for instance, if I show 25 rows per page so I want to query the db for 1-25 rows in the first page, 26

问题 What's the best way of capturing any DBI errors in Perl? For example if an insert fails because there were illegal characters in the values being inserted, how can I not have the script fail, but capture the error and handle it appropriately. I don't want to do the "or die" because I don't want to stop execution of the script. 回答1: Use the RaiseError=>1 configuration in DBI->connect , and wrap your calls to the $dbh and $sth in a try block (TryCatch and Try::Tiny are good implementations for