Foreign Key Constraints and Persistence Issues in Seam [relevance: 1.48]

2008-04-30

public String persist() { //this forces the persist function to persist IbUser before Rcs User and avoids the FKC issue getEntityManager().persist(getInstance().getIbUser()); return super.persist(); }

finding values through hibernate

@Override public String persist(){ //check if the nlc is duplicated here if(getEntityManager().find(JourneyLocation.class, this.instance.getNlc())!=null){ getFacesMessages().add(FacesMessage.SEVERITY_ERROR, "#{messages.nlcExists}") ; return null; }else{ return super.persist(); } }

Ubuntu alsa-utils sound Issues [relevance: 1.39]

2009-10-22

Alsa-Utils sound in Ubuntu 8+ is buggy as hell and always seems to die on me When the sound goes all crackly and

m@m:~$ /etc/init.d/alsa-utils restart

doesn't work; try

m@m:~$ /etc/init.d/alsa-utils reset

other params are:
{start [CARD]|stop [CARD]|restart [CARD]|reset [CARD]}

flash is still havng some issues [relevance: 1.29]

2006-10-25

have been drawing random movie clip instances all over the place an making pretty shapes.. have stuck a few on here to peruse
http://www.sciencenews.org/articles/20020831/mathtrek.asp
http://www.yu4you.com/items/en/photo/item_2118.html

Installing Java on Linux [relevance: 1.18]

2007-08-31

Install:

chmod +x jdk-6u2-linux-i586-rpm.bin

./jdk-6u2-linux-i586-rpm.bin

Follow prompts [yes]/[no] etc

If it gives the error message

error while loading shared libraries: libstdc++.so.5: cannot open shared object file: No such file or directory

Then you have to download

compat-libstdc++-33-3.2.3-47.fc4.i386.rpm

which can be found

ftp://ftp.mirrorservice.org/sites/sourceware.org/pub/gcc/releases/

or by googling it

rpm -i compat-libstdc++-33-3.2.3-47.fc4.i386.rpm
or # yum install libstdc++.so.5

The SDK installed in /usr/java/jdk/

add path to $HOME/.bash_profile

PATH=/usr/java/jdk/bin:$PATH:$HOME/bin:./

export PATH

export JAVA_HOME=/usr/java/jdk

export CLASSPATH=/usr/java/jdk/lib/tools.jar:/usr/java/jdk/jre/lib/rt.jar:./

Possible Issues

When installing Jboss 4.2.1.GA it throws a fit if you have anything less than Java 1.6 JRE and the 1.5 JDK installed - Centos installs it's own version of Java 1.4 to fulfil install dependencies and this seems to conflict with the Sun versions - make sure you uninstall GNU Java 1.4 from the package manager or any other way you fancy and then install first the 1.6 JRE followed by the 1.5 JDK. After that you can just drag a copy of Jboss onto the linux box and start it with /bin/./run.sh & (to spawn a process)

MySQL full indexed text search - just like a real database!! [relevance: 1.12]

2009-03-24

• As of My Sql 3.something you can now add text indexes to your columns and do full text searches with relevance ranking! text indexes are fantastic and allow more efficient searching and categorisation of text. The relevance ranking feature is rather good too and gives you a much better idea of how your search performed. 
•  
• Issues to note are, this example uses relevance ranking as the criteria for returning results, if you take that condition out you will return every result in the database with a relevance score of 0. 
•  
• The default MySQL settings do not bother to index search terms of less than 4 characters therefore searching for anything less will bring back no results. This can be altered by setting "set ft_min_word_len =1" in your mysql config. This will result in a performance hit.  
•  
• Text indexes in large data sets can be quite processor intensive so you might also consider limiting your result set. 
•  
• ALTER TABLE `database`.`table_name` 
• ENGINE = MyISAM; 
•  
• ALTER TABLE table_name 
• MODIFY column_name TEXT; 
•  
• ALTER TABLE table_name 
• ADD FULLTEXT(column_name); 
•  
• SELECT *, 
• MATCH(column_name) 
• AGAINST ('search term') 
• AS score 
• FROM table_name 
• HAVING score > 0 
• ORDER BY score DESC;