How to show Postgres table information
Here you want to use the "describe" command in Postgresql. Assuming that you want to get information about a database table named users, and you're logged into a Postgresql database using the psql...
View ArticlePostgresql backup - How to dump a Postgresql database
I just updated an old Postgresql blog entry about how to make a backup of a Postgresql database. The syntax changed quite a bit since that post in 2004.
View ArticleJDBC 101 - Connect to a SQL database with JDBC
Java database FAQ: How do I connect to a SQL database with Java and JDBC?If you're interested in connecting your Java applications to standard SQL databases like Oracle, MySQL, SQL Server, and others,...
View ArticlePostgresql - How to execute SQL commands from a file
With Postgresql (or Postgres, as I call it) you can execute commands from a file like this: \i your_file_name_here I just did that to run a subset of the restore commands from a backup file that I...
View ArticlePostgresql error - must be owner of relation
If you get a Postgresql error message like this: ERROR: must be owner of relation [your_table_here] don't worry too much, it probably means what it says: You don't own the table (or relation) you're...
View ArticleHow to perform a case-insensitive database query
Database FAQ: How do I do a case-insensitive database search?Answer: When performing a database search using MySQL, PostgreSQl, SQL Server, Oracle, etc., I convert the results of the query to uppercase...
View ArticleHow to perform a SQL query for fields that are null (or not null)
Okay, maybe this is lame, but when I've been away from writing SQL database queries for a while I can never remember how to search for database table fields that are either NULL, or NOT NULL. I always...
View ArticleMac OS X Postgresql: How to start a Postgres server on a Mac
Wow, it had been a long time since I last started Postgres on my Mac computer (a MacBook Pro, to be specific), and it took almost almost 20 minutes to remember how to do it. So, to keep that from...
View ArticleTomcat DBCP error: Cannot create JDBC driver of class ... for connect URL null
I just ran into a crazy error related to Tomcat and DBCP connection pooling. The error message I got after trying to use the Tomcat DBCP connection pooling in my Java web application was:read more
View ArticleJava JDBC connection string examples
Java JDBC FAQ: Can you share Java JDBC connection string examples for the most popular relational databases?Some days we all need something simple, and today I needed the example syntax for a JDBC...
View ArticleTomcat connection pool - a Tomcat JNDI DBCP connection pool example
Here's a quick demonstration of how to create a Tomcat connection pool (database connection pool) using the Tomcat DBCP library.I'm not going to go into a detailed explanation here of how Tomcat DBCP...
View ArticleJava JDBC Postgresql Driver class and URL example
Here's a quick post to help anyone that needs a quick JDBC Driver and URL reference when using Postgresql (Postgres) with Java (and JDBC).The basic Postgresql JDBC Driver and URL information you need...
View ArticleA collection of Java test projects and examples
Sigh, so many broken links, so little time ... when I switched this website to Drupal, I didn't (couldn't) take the time to move all of my static content in the Drupal CMS, so a lot of great content is...
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Older than dirt Postgres just works
This is cool. I used to prefer PostgreSQL/Postgres over MySQL, but guys at my company preferred MySQL. I’m glad to see Postgres is still around. Here’s a link to the story on ReadWrite.
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