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8.4 on the Way. We had the pleasure of doing a fresh install of PostgreSQL 8.3.5 on RedHat EL4 box and when using the Yum repository, we noticed a couple of changes from last time we did this. This could have been an oversight in our documentation before. Tables data_src -- appears to be a list of some food research articles. datsrcln -- correlates articles to nutritional data (nut_data) as we can see from relationships. deriv_cd -- some sort of lookup table to denoting short names - that define if nutritional is derived, calculated or analytical. fd_group -- lookup table defining food groups food_desc -- catalog of various foods foot_note -- general notes about a food stats. Only has one record so can't be that interesting. nut_data -- various stats collected about each food. nutr_def -- lookup table defining the various stat types about food. Things like protein, lactose, etc. concentration src_cd -- superclass of source of information - is it analytical, derived etc. weigth -- different unit types and gram weight of 1 unit of each for each food. For this section note we are living out with metrics like 18:0, 14:0. I have no clue what those things are. We no longer have to pass in a goofy 0 for depth. We can now use a unique feature of functions written in SQL and C that allows set returning functions in those languages to be used in the SELECT clause as described in our Trojan SQL Function Hack - A PL Lemma in Disguise. pg_dumpall -h localhost -p 5432 -U postgres -v --globals-only -f "/path/to/globals.sql" We are especially looking for 7.3+ testers! Gasp and Sun Solaris 64-bit testers and 8.4 testers of any OS persuasion. I know Mark is a man of integrity and he promised this version would work even on 7.3 so I guess we have to stick to that. I don't think anyone personally cares about it working on that version but him, but we have to humor him :). Which minimal PostgreSQL version to support? How many PostGIS users out there are running something lower than 8.2. My general thinking is that there aren't that many and spending key resources on such a small crowd is just not worthwhile. Remember that these executables pg_dumpall, psql are located in the bin of your postgresql install. Surprisingly, even the Free version contains a Gantt Chart which is a real rarity among free charting software. Analyzing what we have. Backing up Login Roles aka Users and Group Roles Beginner. PostGIS 1.3.5 urgent upgrade if you are running 1.3.4. To restore - connect to Postgres db (or any db as a super user) simply open the .sql file in the Query window Delete all the stuff at the top like \connect etc Run the script. Quick Gu > Intermediate. What do we want to know. This now should compile with 8.4 dev Lots of memory leak bugs closed to make upcoming GEOS 3.1 work well with PostGIS and major speed enhancements if you are using GEOS 3.1 AsGeoJSON and minor changes to other output function Numerous speed improvements for ST_Intersects, ST_DWithin, ST_Contains,Within, etc Numerous bug fixes to circular string support and increase in number of functions it works with. Using the Command Line: PostGIS 1.3.4 almost out the Door and 8.4 highlights. From the Editors. In this 3-part series article we shall demonstrate using this with a PostgreSQL database, building a simple dashboard with ASP.NET and PHP. We shall demonstrate both C# and VB.NET both using the PostgreSQL NPGSQL driver. Basics. What's new and upcoming in PostgreSQL. Then copy the above script to a text file called pgagent -- no extension Upload to folder on server /etc/rc.d/init.d . The path may vary slightly On server do a chmod 755 /etc/rc.d/init.d/pgagent to make it executable. to Add to start up services: chkconfig pgagent on To test you can do a service pgagent start. Yum addendum for 8.3.5 and PgAgent Beginner. Storing values in Temp variables, FOUND and more recursion. We were forced to release a 1.3.5 PostGIS upgrade as a result of a bug we accidentally introduced in 1.3.4 during our code cleanup. We apologize for any inconvenience this may have caused people. This bug affects the use of MULTILINESTRINGS and rears its ugly head by giving errors such as invalid circular line string when calling ST_Multi or another odd error when doing a Force collection on a MULTILINESTRING. This hits mapserver users using these geometry types the hardest. Installing the driver is the same in OpenOffice 3.0. pg_dumpall -h localhost -p 5432 -U postgres -v --roles-only -f "/path/to/useraccts.sql" PostGIS 1.3.5 out the door critical patch to 1.3.4 and Testing Enhancements. Documentation-driven testing and how I learned to love XML and XSLT. This is when you should whip out something like Fusion Charts. This is just a small part of a three part series. In our application arena, we shall demonstrate using Fusion Charts in PHP as well as ASP.NET and of course display PostgreSQL data using it. We shall only be demonstrating the Free version. If you really insist on Oracle, MySQL, IBM DBII, SQL Server, SQLite or FireBird or some other flavor of db, you can perform the same trick with slight variation. You just need data you want to chart. How do you restore just the users and roles without having to do a full pg_dumpall of your server? Looking at the data, some interesting questions come to mind. We may expand on this as we get into the app. Anyone with other thoughts are free to suggest. For the database, we shall be using the usda (USDA The US Department of Agriculture's public domain food and nutrient database) which you can download from http://pgfoundry.org/projects/dbsamples/. For 8.3.5 fresh install it seems they are separated and to get the postgresql server you need to do: Below is a Thumbnail view of the PostgreSQL 8.3 PL/PGSQL cheat sheet that covers both 8.3 new features and past core PL/PGSQL features. This is by no means comprehensive, but are the features we use most often. I suppose all side and core projects of PostgreSQL have to deal with this problem. Supporting numerous platforms and numerous versions of PostgreSQL is no easy undertaking and of course takes away resources that can be focused on bugs and new enhancements. PL Programming. We will be testing this on 8.3, but since the database is an old one, it should work just fine on older versions of PostgreSQL. We'll try to refrain from using new features of PostgreSQL. Pre 8.3 syntax pg_dumpall -h localhost -p 5432 -U postgres -v --globals-only > /path/to/useraccts.sql. We also described PgAgent in our January 2008/February 2008 issue, which is a task scheduling agent for PostgreSQL, which is similar in concept to Microsoft SQL Server Agent, but cross-platform so should fill Microsofties with a warm and fuzzy feeling. Changes to Yum Install for 8.3.5? psql -h localhost -d postgres -U postgres -f "/path/to/useraccts.sql" We covered installing Open Office's PostgreSQL SDBC driver in Using OpenOffice Base 2.3.1 with PostgreSQL. DEBUG, LOG, and INFO are just different levels of NOTICE and only vary depending on which logs they get written to and if they get written to client. By default NOTICE is always written to the client. These are controlled by the postgresql.conf client_min_messages and log_min_messages . GEOS 3.0.3 also has numerous bug fixes such as a contains bug fix, compilation fixes to allow compiling on higher gcc. With that said, its highly recommended to upgrade to 3.0.3 as well. A simple example of notices and recursion is shown below. Admittedly I couldn't come up with a more pointless example to demonstrate recursion: RAISE. We also throw in to get the development headers: yum install postgresql-devel. From the Editors. For this first part we shall simply load the database, do a quick analysis of what we've got to report on and create some views to help us with our PHP and ASP.NET apps that will follow in parts 2 and 3. A while back Kevin Neufeld came up with an efficient template for documenting each PostGIS function. This is the template we are using to rewrite the PostGIS 1.4 function reference section. The PostGIS 1.4 function reference section is almost complete. This allowed us to create special indexes sections and generate database level comments on functions with an XSL Transform. Sometimes you have the need to store intermediate results in a temp variable from a query to use for later processing. Here is a simple example of that. Downloads of the source are at: http://postgis.refractions.net/download/ Choose the 1.3 snapshot or 1.3.4RC3 when we release it. 8.4 has a couple of things cooking to advance SQL in PostgreSQL and improved features for PL/PGSQL. Below is just a sampling. RAISE EXCEPTION is slightly different. It both displays an error message and halts further excecution of the stored function. PDF Portrait version 8.5 x 11" of this cheatsheet is available at PostgreSQL 8.3 PL/PGSQL Cheatsheet 8.5 x 11 and also available in PDF A4 format and HTML. A couple of notes here of what has changed: PostGIS 1.3.4 is finally out the door. This version has: Support for 7.3, 7.4, 8.0, 8.1, 8.2, 8.3, 8.4 beta GEOS 2.2.3, GEOS 3.0.3, GEOS 3.1 beta Numerous bug fixes and speed improvements Slightly better documentation addition of function comments to help guide new users while in the psql or pgAdmin environment One new function ST_AsGeoJSON to support javascript apis such as OpenLayers. I'm curious what other PostgreSQL projects do and if PostgreSQL and other open source developers think this is wise. Using PgAdmin III Connect to the Server At Server level, right click the Server and choose Backup Globals Browse to path you want and give a .sql extention. FOUND is a state variable that contains either true or false if the last result returning query returned records or not. RAISE Notices in plpgsql are generally used for two reasons: As a simple debugging tool to output state variables in a function call. As a WARNING to a user to inform them of important things such as this function is deprecated and should not be used or they are using something in an incorrect way. It is still a work in progress, but was unfortunately too late in coming to test 1.3.4. Testing against 1.3.5 we uncovered some crashers and minor defects that have existed in this and prior versions which we plan to attend to in 1.3.6 and 1.4. We also uncovered another small thing we sort of broke with Curved types, but was of questionable logic to begin with that we temporarily patched in 1.3.5 but will revisit in later versions. Hopefully this added step to our testing process will save us from similar mistakes in the future. What we really love about this product. Basics. Below is a snapshot of what our loaded database relationships look like in OpenOffice 3.0. Fusion Charts is a Macromedia Flash-based charting component that makes extremely attractive 2D and 3D charts. It comes in 2 flavors. In our Product Showcase section of this issue, we introduced Fusion Charts which is a flash-based charting product that makes beautiful flash charts. It comes in both a free and a non-free more bells and whistles version. If you want to backup all globals which includes tables spaces run. David Fetters Trees and More http://fetter.org/Trees_and_More_WEST_2008.pdf - which demonstrates how to write recursive SQL statements with upcoming Common Table Expressions in 8.4 Hubert's Waiting for 8.4 - pl/* srf functions in selects http://www.depesz.com/index.php/2008/11/03/waiting-for-84-pl-srf-functions-in-selects/ - this one is a pretty important one I think. It means no longer a need for a trojan like hack for 8.4+ Hubert's Waiting for 8.4 - RETURNS TABLE http://www.depesz.com/index.php/2008/08/04/waiting-for-84-returns-table/ Again this feature I consider to be pretty important. Especially for people coming from Microsoft SQL Server backgrounds from a comfort stand-point (look at how similar SQL Servers table returning functions look). It also means no longer needing to create a custom type as we did above if you want to return a custom set of fields. Below is a slightly different variant of the above: Also note here we follow the general practice of having a single point of return. Having a single point of return tends to make your code easier to read and debug. Fusion Charts and PostgreSQL Part 1: Database Analysis of USDA DB Beginner. Application Development. Create view to get average stats about food groups by unit and metric. Create a view to provide basic food stats by metric. PgAgent on CentOS/Red Hat EL as a service. Special Feature. Creating Views and granting rights. PostGIS 1.3.4 is almost out the door - Need testers. This product is not specifically a PostgreSQL product but it is one that we use frequently with many of our database apps so we felt our obligation to blog about it in the context of databases. Lets face it, when you have a database, somebody will come to you one day and demand to see their data in sparkling colors, because why have data if you can't see it in sparkling colors. They might not know what the data is telling them, but at least it will look damn good when charted in 3D. PostgreSQL unlike Microsoft SQL Server, supports function name and argument overloading. Which in a nutshell means you can have multiple functions with the same name as long as they take a different number of arguments and/or different argument types. The functions don't even need to be written in the same language. With that said we can make our function a bit nicer by doing this. RAISE also has other variants namely DEBUG(1-5) , LOG , INFO , EXCEPTION. Sometimes when you are testing or setting up a server or just porting things to another server, you just want to install the same set of users as you had before without restoring any databases. In PostgreSQL, the users (Login Roles) and group roles are stored at the server level and only the permissions to objects are stored at the database level. Below is an example that demonstrates, FOUND, storing sql values in temp variables, and more recursion. Well PostGIS 1.3.4 is almost out the door and we will be releasing an RC3 very shortly. As a developer in the group and also as a user of the product that is near and dear to me I would be really appreciative if people in the PostgreSQL community interested in PostGIS can test this out. Below is a clip of Mark Cave-Ayland's note to the postgis-dev group. It turned out not to be too hard to write an xsl transform script that takes our documentation as input and spits out what I shall call a torture script that for each function defined in our documentation exercises it for each geometry type we support. So the output is an approximate 1 MB file of sql battery of tests. The added benefits is that as we add new functions to our documentation, they are automatically tested and the script also flags when documented functions are no longer in use or errors in the documentation. So its a very interesting feedback loop. What is in store in 8.4. Fusion Chart v3 Fusion Charts v3 which comes with about 45 different chart types to choose from and numerous other extra bells and whistles for animation and integration. Fusion Charts v2 Free - The free version is free for commercial use as well, but has only 22 chart types and limited animation features. This version actually satisfies most of our charting needs. Which allows us to do this: In the first step we had: yum install postgresql and that as I recall installed the postgresql server in addition to some client libraries. In this third part of our PLPGSQL Quick Guide series, we shall delve into writing recursive functions. Before we do that, we shall demonstrate a very important but trivial feature in PostgreSQL and that is the RAISE NOTICE feature. There are more elegant ways of debugging, but this is the simple brain dead way of doing so. More details of the issue can be gleaned from Paul Ramsey's blog. Warning: PostGIS 1.3.4 + Mapserver. This documentation enhancement helped at least partly solve another problem all thru the magic of XSLT. Given how much code we are refactoring and so, forth, how can we possibly test all 150 someodd spatial functions against all geometry types we support and continue to do so as our geometry types expand and functions expand? PgAgent is now separate from PgAdmin III for Linux. Below is a sample script we hacked together from some samples we have seen. Works for us at anyrate, but we are predominantly microsofties though less so than we were before, so more professional Linux users, feel free to butt in. This example is the plpgsql equivalent to our SQL Server Transact-SQL article called Using SQL Server 2000's User Defined Function to solve the Tree Problem. In our April 2008 issue we had An Almost Idiot's Guide to PostgreSQL YUM and that article still seems to be surprisingly popular. Stay tuned for our Application demonstrations of how pretty data can look when dressed up in charts. To finish off our PL/PGSQL tutorial series, we are providing a PL/PGSQL cheat sheet. PostGIS 1.3.4 is finally out the door. Loading the USDA Database. The Charts are clean and breathtakingly beautiful The XML data format it requires is relatively easy to produce Both the Free and Commercial come packaged with APIs for ASP.NET, PHP, ASP Some simple demonstrations can be seen here. The differences between the Free and Non-free versions are outlined in Free vs. v3. It should automatically start on its own during server boot ups. PostgreSQL 8.3 PLPGSQL Cheatsheet Overview. Now lets see what we have here and what interesting questions we can answer and graph from this data. Since we have no instructions to go by aside from the relationships and the data we see, we'll make some educated guesses. Product Showcase. Now for the load. Now this database turns out to be somewhat rich for a demo db. It helps to look at the relationships in a relational designer to get a breath of what metrics we can glean from here. So lets itemize what we have here. By doing the above we kill 2 birds with one stone: Overloading Function names. 8.4 seems to be moving along. Hubert Lubaczewski has some nice examples of what you can expect and boy is he on a roll. Below are some and I'm sure I missed others. Some advanced GEOS functions such as ST_SimplifyPreserveTopology and ST_CoveredBy (both released in 1.3.3) will not be installed unless you are running GEOS 3.0 or above. Cool Features. 8.3 introduced the -f option to denote the file name and -r to only backup roles which makes things a bit more predictable how they behave from OS to OS. So to get PgAgent Download from http://www.postgresql.org/ftp/pgadmin3/release/pgagent/ Extract - Copy bin/pgagent file to /usr/bin/ Make sure to mark as executable with chmod 775 /usr/bin/pgagent Run psql -U postgres -d postgres -f pgagent.sql Install PgAgent as a service. See next section. Then to restore the accounts on the new server, open up the .sql file generated and delete all the accounts and stuff you don't want to bring over. Then just run the generate .sql file with psql something like. What is Fusion Charts? There is some talk recently in the PostGIS development team as to what minimal to support. I'm all for dropping 7.4.whatever and 8.0 for past releases (bug fix releases) and new major releases only supporting 8.2+ given our limited resources. Table Of Contents. Fusion Charts for Sprucing up Data. What are the top 10 foods that provide the most protein, caffein, sugar, etc, pick your favorite metric? Which food groups have the highest average concentration of protein, caffeine, sugar, pick your favorite metric? Extract the tar.gz file. Launch your shell - if you are on windows you'll want to use the Start->Program Files->PostgreSQL someversion ->Command Prompt.

 

 

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