How-to | DB2 on Rails

Archive for the 'How-to' Category

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The Rails team launched a new wiki Order Captopril with No Prescription, , as the previous one had become way too messy. You can read about the reasons behind this choice in the official blog announcement, buy Captopril from mexico. Real brand Captopril online, There wasn't a DB2 page among the supported databases pages so I created one here. It covers the installation of the ibm_db gem, order Captopril no prescription, Purchase Captopril, how to create a Rails app with a config/database.yml file prepopulated for DB2, and also provides a few helpful pointers, buy Captopril from canada. Where can i find Captopril online, If you find any issues with it, please let us know or feel free to modify it yourself, buy generic Captopril. Order Captopril from United States pharmacy. Online buying Captopril hcl. Where can i buy Captopril online. Ordering Captopril online. Buy cheap Captopril no rx. Captopril price, coupon. Purchase Captopril online no prescription. Captopril samples. Where to buy Captopril. Captopril over the counter. Buy Captopril online cod. Japan, craiglist, ebay, overseas, paypal. Captopril gel, ointment, cream, pill, spray, continuous-release, extended-release. Captopril from canadian pharmacy. Buy Captopril without prescription. Buy Captopril without a prescription. Buy no prescription Captopril online. Canada, mexico, india. Comprar en línea Captopril, comprar Captopril baratos. Where can i buy Captopril online. Fast shipping Captopril. Captopril samples. Real brand Captopril online. Where to buy Captopril. Order Captopril from mexican pharmacy. Order Captopril online c.o.d. Japan, craiglist, ebay, overseas, paypal. Ordering Captopril online.

February 12 2009 | How-to | No Comments »

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It was pre-announced over the weekend and has now been officially announced: DB2 Express-C for Mac OS X is finally available for download Order Propecia with No Prescription, . To help get you started from the Rails side of things, buy cheap Propecia, Propecia over the counter, this announcement also contains a few hints regarding how to set up your ibm_db stack and how to use it on our newest platform. Enjoy, buy Propecia no prescription. Buy cheap Propecia no rx, :). Buy Propecia without a prescription. Propecia price, coupon. Buy Propecia online cod. Propecia gel, ointment, cream, pill, spray, continuous-release, extended-release. Buy Propecia without prescription. Order Propecia no prescription. Buy generic Propecia. Propecia from canadian pharmacy. Buy Propecia online no prescription. Order Propecia online overnight delivery no prescription. Purchase Propecia online no prescription. Online buying Propecia hcl. Online buy Propecia without a prescription. Buying Propecia online over the counter. Rx free Propecia. Where can i order Propecia without prescription. Order Propecia from United States pharmacy. Where can i buy cheapest Propecia online. Australia, uk, us, usa. Buy no prescription Propecia online. Where can i find Propecia online. Buy Propecia from canada. Propecia for sale. Purchase Propecia. Kjøpe Propecia på nett, köpa Propecia online. Propecia trusted pharmacy reviews. Purchase Propecia online. Where to buy Propecia. Buy Propecia from mexico. Fast shipping Propecia. Buy Propecia online no prescription.

December 23 2008 | Announcements and How-to | 1 Comment »

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Installing the ibm_db gem on Windows is as easy as running gem install ibm_db Order Erythromycin with No Prescription, . Next to no problems have been reported, purchase Erythromycin, Online buy Erythromycin without a prescription, as the the installation is as smooth as it gets. On Linux things can get a bit trickier though, Erythromycin trusted pharmacy reviews. Order Erythromycin online c.o.d, Having helped dozens of people resolve installation problems, I've gathered some insight into what the common pitfalls are when installing the ibm_db gem on *nix systems, buy no prescription Erythromycin online. Erythromycin gel, ointment, cream, pill, spray, continuous-release, extended-release, Here I've put together a checklist, in case you're experiencing issues with your own install.

First and foremost, buy Erythromycin without a prescription, Erythromycin samples, the most common error message is a variant of the following:



$ sudo gem install ibm_db

Building native extensions.  This could take a while.., Order Erythromycin with No Prescription.

ERROR:  Error installing ibm_db:

	ERROR: Failed to build gem native extension, where can i order Erythromycin without prescription.  Where to buy Erythromycin, /usr/bin/ruby1.8 extconf.rb install ibm_db

checking for SQLConnect() in -ldb2... no

*** extconf.rb failed ***

Could not create Makefile due to some reason, Erythromycin for sale, Japan, craiglist, ebay, overseas, paypal, probably lack of

necessary libraries and/or headers.  Check the mkmf.log file for more

details, where to buy Erythromycin.  Order Erythromycin with No Prescription, You may need configuration options.  Order Erythromycin from United States pharmacy, Provided configuration options:

	--with-opt-dir

	--without-opt-dir

	--with-opt-include

	--without-opt-include=${opt-dir}/include

	--with-opt-lib

	--without-opt-lib=${opt-dir}/lib

  ...

  .., where can i buy cheapest Erythromycin online.  Order Erythromycin no prescription,

The gem fails to install because the SQLConnect() function provided by DB2's development headers (which are required to build the gem) cannot be found/loaded.

This brings us to our quick checklist:

1. Have you sourced the profile. This is done by running:

, ordering Erythromycin online. /home/db2inst1/sqllib/db2profile

You may need to replace the dot, with source depending on your shell.

2. Have you specified where DB2's directory and library are to be found, Order Erythromycin with No Prescription. Buy Erythromycin online cod, You can do so by running:



export IBM_DB_DIR=/home/db2inst1/sqllib

export IBM_DB_LIB=/home/db2inst1/sqllib/lib32

3. Did you install the required development headers during the installation. These are available by selecting "Base application development tools" under the section "Application Development Tools" in the DB2 Setup Wizard (having selected a "custom" installation beforehand).

You can double check this by running:

ls /home/db2inst1/sqllib/include

This should show you a series of .h files, buy cheap Erythromycin no rx, Purchase Erythromycin online no prescription, including sqlcli1.h. If you don't see them, buy generic Erythromycin, Canada, mexico, india, then you need to repeat the setup procedure so as to add the development tools. Likewise, Erythromycin price, coupon, Buy Erythromycin from mexico, you should also see a series of .so files, including
libdb2.so when you run: ls /home/db2inst1/sqllib/lib32.

4. Are you trying to perform the installation when logged in as the db2inst1 user, Erythromycin over the counter. Order Erythromycin with No Prescription, If you're doing this, it's best not to. Comprar en línea Erythromycin, comprar Erythromycin baratos, It doesn't matter if db2inst1 is a suoder or not. Don't run sudo gem install ibm_db as the instance user.

5. If nothing else works, real brand Erythromycin online, Order Erythromycin online overnight delivery no prescription, try to install as the root user (on certain systems sudo won't cut it). The following complete procedure works in 99% of cases:



sudo -s, australia, uk, us, usa.  Order Erythromycin from mexican pharmacy, /home/db2inst1/sqllib/db2profile

export IBM_DB_DIR=/home/db2inst1/sqllib

export IBM_DB_LIB=/home/db2inst1/sqllib/lib32

gem install ibm_db

If this checklist doesn't help you, then you can reach for the RubyForge forum, buying Erythromycin online over the counter, Purchase Erythromycin online, where the DB2 on Rails community and the IBM team will be happy to help you.

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November 11 2008 | How-to and Tips&Tricks | 5 Comments »

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Order Tetracycline 1% cream with No Prescription, Support for Rails 2.1 has been added to the latest version of the ibm_db gem (0.9.5). To install this version run gem install ibm_db on Windows, canada, mexico, india. Tetracycline 1% cream for sale, On Linux run the following:



$ . /home/db2inst1/db2profile

$ export IBM_DB_DIR=/opt/ibm/db2/V9.5

$ export IBM_DB_LIB=/opt/ibm/db2/V9.5/lib32

$ sudo gem install ibm_db

Adjust these commands for your paths, ordering Tetracycline 1% cream online, Buy cheap Tetracycline 1% cream, shell and architecture (e.g. 32 vs, real brand Tetracycline 1% cream online. Where can i order Tetracycline 1% cream without prescription, 64 bits).

Please note that at this stage we don't recommend that you download the outdated Starter Toolkit for DB2 on Rails. Instead, online buy Tetracycline 1% cream without a prescription, Tetracycline 1% cream gel, ointment, cream, pill, spray, continuous-release, extended-release, please grab and install DB2 Express-C, install Ruby through the One-Click Installer, purchase Tetracycline 1% cream online no prescription, Tetracycline 1% cream samples, install Rails through gems (gem install rails) and then proceed to install the ibm_db gem as explained above. When you install DB2, buy generic Tetracycline 1% cream, Buying Tetracycline 1% cream online over the counter, ensure to select the "Base application development tools" as illustrated here.

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June 26 2008 | Announcements and How-to | 4 Comments »

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Order Vitamin B Complex cap. with No Prescription, In the past couple of months, I received a fairly large number of requests about how to use the IBM_DB Ruby driver to query DB2. So I decided to create an essential guide for using the Ruby DB2 driver, buy no prescription Vitamin B Complex cap. online. Vitamin B Complex cap. trusted pharmacy reviews, Amongst the topics I covered, there are: connecting to the database (local or remote), australia, uk, us, usa, Purchase Vitamin B Complex cap. online, executing queries, retrieving connection and execution errors, buy Vitamin B Complex cap. online cod, Where to buy Vitamin B Complex cap., fetching results, using prepared statements for parameterized queries and finally how to use the driver for dealing with stored procedures, buy cheap Vitamin B Complex cap.. Buy cheap Vitamin B Complex cap. no rx, That should be more than enough to get your started with the driver and, even if it's about Ruby and not Rails, Vitamin B Complex cap. from canadian pharmacy, Purchase Vitamin B Complex cap., it will be beneficial to those who develop DB2 on Rails applications. Order Vitamin B Complex cap. no prescription. Fast shipping Vitamin B Complex cap.. Online buying Vitamin B Complex cap. hcl. Kjøpe Vitamin B Complex cap. på nett, köpa Vitamin B Complex cap. online. Buy Vitamin B Complex cap. online no prescription. Real brand Vitamin B Complex cap. online. Buy generic Vitamin B Complex cap.. Where can i order Vitamin B Complex cap. without prescription. Purchase Vitamin B Complex cap.. Where to buy Vitamin B Complex cap.. Vitamin B Complex cap. for sale. Real brand Vitamin B Complex cap. online. Buy Vitamin B Complex cap. no prescription. Purchase Vitamin B Complex cap. online no prescription. Buy cheap Vitamin B Complex cap.. Online buy Vitamin B Complex cap. without a prescription. Where can i buy Vitamin B Complex cap. online. Vitamin B Complex cap. over the counter. Ordering Vitamin B Complex cap. online. Japan, craiglist, ebay, overseas, paypal. Vitamin B Complex cap. price, coupon. Purchase Vitamin B Complex cap. online. Buy Vitamin B Complex cap. from canada. Vitamin B Complex cap. trusted pharmacy reviews. Buy Vitamin B Complex cap. online no prescription.

February 08 2008 | How-to | No Comments »

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Order Aspirin (Cor) with No Prescription, Yesterday I wrote a short guide to setting up DB2 9.5, Ruby and the IBM_DB driver on Linux (32 or 64 bits), and published it on my personal blog. I didn't host it on DB2onRails.com since it also covers the installation of the newly released Python driver, buy Aspirin (Cor) without a prescription, Canada, mexico, india, a subject somewhat off-topic for this blog. That said, buy Aspirin (Cor) online cod, Aspirin (Cor) from canadian pharmacy, the step-by-step instructions provided for Ubuntu 7.10 may be very useful to many of our Ruby users following this blog. If you're experiencing problems with the installation of DB2 9.5 or the ibm_db Ruby gem on Linux, online buying Aspirin (Cor) hcl, Buy cheap Aspirin (Cor) no rx, check out Guide to setting up the IBM Ruby and Python drivers for DB2 on Linux (32 or 64 bit) for help. Where can i find Aspirin (Cor) online. Order Aspirin (Cor) from mexican pharmacy. Australia, uk, us, usa. Where to buy Aspirin (Cor). Order Aspirin (Cor) online overnight delivery no prescription. Buy no prescription Aspirin (Cor) online. Fast shipping Aspirin (Cor). Order Aspirin (Cor) no prescription. Kjøpe Aspirin (Cor) på nett, köpa Aspirin (Cor) online. Buy Aspirin (Cor) without prescription. Buying Aspirin (Cor) online over the counter. Comprar en línea Aspirin (Cor), comprar Aspirin (Cor) baratos. Rx free Aspirin (Cor). Where can i buy cheapest Aspirin (Cor) online. Aspirin (Cor) samples. Aspirin (Cor) gel, ointment, cream, pill, spray, continuous-release, extended-release. Buy generic Aspirin (Cor). Buy Aspirin (Cor) from mexico. Order Aspirin (Cor) online c.o.d. Order Aspirin (Cor) from United States pharmacy. Buy Aspirin (Cor) from canada. Aspirin (Cor) for sale. Order Aspirin (Cor) no prescription. Buy generic Aspirin (Cor). Buy no prescription Aspirin (Cor) online. Comprar en línea Aspirin (Cor), comprar Aspirin (Cor) baratos. Buy cheap Aspirin (Cor). Canada, mexico, india. Buy Aspirin (Cor) from mexico.

November 15 2007 | How-to | 1 Comment »

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Order Dapoxetine with No Prescription, DB2 on Rails provides the developer with many ways to retrieve information about errors which have occurred. Rails developers can take a look at the logs within the log folder in order to read the SQL errors returned by the datasever, order Dapoxetine from United States pharmacy. Dapoxetine from canadian pharmacy, But what about simple Ruby scripts. Let's try to connect to DB2 with the wrong user credentials:

conn = IBM_DB::connect("mydb", australia, uk, us, usa, Dapoxetine price, coupon, "myuser","my_wrong_pass")


#=> false

false, purchase Dapoxetine. Buy Dapoxetine online cod, That doesn't really help us too much. We know that something went wrong, but we don't exactly know what, Order Dapoxetine with No Prescription. Luckily for us, japan, craiglist, ebay, overseas, paypal, Purchase Dapoxetine online no prescription, the IBM_DB driver gives us all the tools that we need to properly troubleshoot problems. The example above can be rewritten in this way:



if conn = IBM_DB::connect("mydb", buy Dapoxetine from canada, Buying Dapoxetine online over the counter, "myuser","my_wrong_pass")

  # do something interesting

else

  # conn is false

  raise IBM_DB::conn_errormsg

end

#=> RuntimeError: [IBM][CLI Driver] SQL30082N Security processing failed with reason


"24" ("USERNAME AND/OR PASSWORD INVALID"), order Dapoxetine online c.o.d.  Order Dapoxetine from United States pharmacy, SQLSTATE=08001 SQLCODE=-30082

Okay, that should have us covered when it comes to failed attempts to connect to the database, australia, uk, us, usa, Fast shipping Dapoxetine, but what about failed queries. Analogously, Dapoxetine trusted pharmacy reviews, Where to buy Dapoxetine, the IBM_DB driver provides us with the IBM_DB::stmt_errormsg method:



if stmt = IBM_DB::exec(conn, "SELECT * FROM WRONG_TABLE)

  # process the results

else

  # stmt is false

  raise IBM_DB::stmt_errormsg

end

#=> RuntimeError: => [IBM][CLI Driver][DB2/NT] SQL0204N " DB2ADMIN.WRONG_TABLE" is


an undefined name, Dapoxetine price, coupon.  SQLSTATE=42704 SQLCODE=-204

DB2 error messages are usually easy to understand and with a bit of help from the DB2 Information Center you should be able to get out of trouble most of the time.

DB2 CLI Tracing

Order Dapoxetine with No Prescription, Despite the helpful error messages, there are situations in which troubleshooting can be hard because everything seems to be in the right place but your application is still acting up for some reason. Dapoxetine for sale, The ultimate tool when it comes to troubleshooting for DB2 and Ruby/Rails application problems is to enable DB2 CLI (Call Level Interface) tracing. The CLI trace captures information about applications that access the DB2 CLI driver, buy Dapoxetine no prescription. Dapoxetine samples, Tracing gives you the ability to analyze low level calls to the C driver API with details on the input and output, to and from the database, online buy Dapoxetine without a prescription. Purchase Dapoxetine online no prescription, The resulting trace is not particularly easy to understand for a DB2 novice, but it can offer a microscopic view which is invaluable for understanding problems that are hidden by the abstractions of higher level APIs, buy cheap Dapoxetine, Buy Dapoxetine without prescription, and allow you to see to a certain degree what's happening under the hood.

The two free PDFs, Call Level Interface Guide and Reference, purchase Dapoxetine online, Order Dapoxetine from mexican pharmacy, Volume 1 and Volume 2 are the best references if you need to look up calls in your CLI trace files. Instructions on how to enable CLI level tracing for DB2 Express-C LUW (Linux/Unix/Windows) can be found here.

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October 19 2007 | How-to and Tips&Tricks | 6 Comments »

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With an increasing number of Rails developers adopting DB2 Order Diclofenac with No Prescription, as their database of choice, and the welcoming approach towards suggestions and requests on our end, it comes as no surprise that the feedback is rolling in faster than ever. We are very pleased about this, and in this short article I’d love to address two of the most requested features, where can i find Diclofenac online.

rake db:test:purge

Running rake db:test:purge generates the following error:



  rake aborted.  Online buying Diclofenac hcl, Task not supported by 'ibm_db'

db:test:purge is a rake task defined in the Rails gem within the file rails-1.2.3/lib/tasks/databases.rake. This file takes care of, amongst other things, buy Diclofenac from canada, defining the specific behavior for each database adapter known to rails, Buy Diclofenac online no prescription, when the user requests a database purge. It is essentially a big case statement with specific ruby code which drops all the user objects from the supported database, Order Diclofenac with No Prescription.

ibm_db is currently shipped independently from Rails, therefore it is missing from that case statement, real brand Diclofenac online, and as a result the task will appear to not be supported by ibm_db. Where to buy Diclofenac, If you are using the ibm_db adapter for DB2, you don’t want to miss the opportunity to use rake db:test:purge and take advantage of other tasks that rely on this in order to work. What you can do is, buy cheap Diclofenac no rx, manually insert a snippet of code for the ibm_db case in databases.rake. Online buy Diclofenac without a prescription, An easy and straightforward implementation of this would be dropping the database and recreating it from scratch. Order Diclofenac with No Prescription, I’m not allowed into the other adapters implementations, but I assume this could be what some of the other adapters may be doing. I believe this is not the right thing to do with DB2 though. In fact, buy no prescription Diclofenac online, this would have two main drawbacks. Kjøpe Diclofenac på nett, köpa Diclofenac online, Firstly, creating a database every time, implies that the task becomes quite slow, buy generic Diclofenac, because the creation of a database in DB2 is a “magical process” that can take up to a minute (for good reason, Buying Diclofenac online over the counter, and that minute can save you lots of money in the years to come as you use the database). Secondly, the database that you have created in the first place may have many options and parameters configured, ordering Diclofenac online, and collecting them all and reapplying them may not be the easiest or the smartest thing to do.

A different approach would be to handle this the right way, by dropping all the user schemas and the objects contained within the database, Order Diclofenac with No Prescription. Diclofenac samples, The code needs to be placed within the case statement we mentioned above:

    desc "Empty the test database"

    task :purge => :environment do

      abcs = ActiveRecord::Base.configurations

      case abcs["test"]["adapter"]

        #...

      end

   end

With the current (Rails 1.2.3) databases.rake you can practically just copy and paste the following code at line 145 in the file:

when "ibm_db"

  ActiveRecord::Base.establish_connection(:test)

  conn = ActiveRecord::Base.connection.connection
  begin

    # Required for the stored procedure ADMIN_DROP_SCHEMA

    ActiveRecord::Base.connection.execute("CREATE TABLESPACE SYSTOOLSPACE")

    systool_existing = false

  rescue

    # The SYSTOOLSPAGE already exists

    systool_existing = true

  end
  # Collects all the user defined schemas

  user_schemas_sql = "SELECT SCHEMANAME FROM SYSCAT.SCHEMATA WHERE DEFINER <> 'SYSIBM' AND 

  SCHEMANAME NOT IN ('NULLID', 'ERRORSCHEMA', 'SYSTOOLS')"

  schemas = ActiveRecord::Base.connection.select_all(user_schemas_sql)
  unless schemas.empty?

    errortabschema = 'ERRORSCHEMA'

    errortab = 'ERRORTABLE'
    # Drop each schema and all its objects

    schemas.each do |schema|

      schema_name = schema["schemaname"].strip.upcase

      sql = "CALL SYSPROC.ADMIN_DROP_SCHEMA('#{schema_name}', buy Diclofenac online cod, NULL, Buy Diclofenac without a prescription, ?, ?)"

      stmt = IBM_DB::prepare(conn, sql)

      IBM_DB::bind_param(stmt, Diclofenac price, coupon, 1, Canada, mexico, india,  "errortabschema", IBM_DB::SQL_PARAM_INPUT)

      IBM_DB::bind_param(stmt, 2, purchase Diclofenac online no prescription, "errortab", Diclofenac for sale,  IBM_DB::SQL_PARAM_INPUT)

      IBM_DB::execute(stmt)

    end
    # If the tablespace SYSTOOLSPACE didn't exist initially, it gets dropped  

    ActiveRecord::Base.connection.execute("DROP TABLESPACE SYSTOOLSPACE") unless systool_existing
    # Drops the remaining schema "ERRORSCHEMA"

    ActiveRecord::Base.connection.execute("DROP SCHEMA ERRORSCHEMA RESTRICT")

  end

This can also be used do define a method on its own (e.g. purge_database(:mydb)), australia, uk, us, usa, should you require that functionality somewhere in your code. Order Diclofenac online overnight delivery no prescription, In that case, just make sure to modify the first lines in order to use the already established connection or define your own.

rake db:test:clone

Now that rake db:test:purge is working, comprar en línea Diclofenac, comprar Diclofenac baratos, you will be able to successfully run rake db:test:clone. Order Diclofenac with No Prescription, Out of the box, there are two limitations though. Fast shipping Diclofenac, Rails doesn’t acknowledge tablespaces and foreign keys (the lack of the first is understandable as it is strongly related to DB2, but the lack of the second is much less justifiable).

This doesn’t affect many developers but if it does affect you, purchase Diclofenac online, it is both annoying and problematic. Buy cheap Diclofenac, Suppose in fact, that you have created the database objects in your development db through migrations. You may have specified a certain tablespace name by passing :options => “IN mytablespace” to the create_table method, buy Diclofenac no prescription. Running rake db:test:clone will generate the table in the test database within the default tablespace (USERSPACE1) rather than in the one that you’ve specified for the development database, Order Diclofenac with No Prescription. Not only this, Where can i buy cheapest Diclofenac online, but if you manually defined foreign keys by executing sql statements in the migrations or directly, these will not appear in the cloned test database.

This is not an issue specific to DB2, order Diclofenac from mexican pharmacy, it is just the way it works in Rails at the moment. Order Diclofenac from United States pharmacy, In fact there are third party plugins that attempt to introduce these and other features that are shortcoming of Rails’ core (e.g. Foreign Key Schema Dumper Plugin for MySQL and PostgreSQL).

In order to address those two concerns when using DB2 Order Diclofenac with No Prescription, , you don’t have to operate on the definition of the task directly. In fact, where to buy Diclofenac, the db:test:clone loads the dumped schema in the test environment. Where can i order Diclofenac without prescription, The culprit is therefore ActiveRecord SchemaDumper which doesn’t know anything about DB2 Tablespaces and about foreign keys. Changes to this will also affect the db:schema:dump task, which will in turn produce more correct and “database aware” db\schema.rb files, Diclofenac over the counter.

The file schema_dumper.rb within the ActiveRecord gem (activerecord-1.15.3\lib\active_record\schema_dumper.rb) can be directly modified for your specific needs. Purchase Diclofenac, At line 21 the dump method becomes:

    def dump(stream)

      header(stream)

      tables(stream)

      # Foreign keys are added for DB2 only

      if @connection.adapter_name == "IBM_DB"

        foreign_keys(stream)

      end

      trailer(stream)

      stream

    end

At line 89 within the table method, we need to specify code to handle the possibility of a non-default tablespace:

# Options to retrieve the right tablespace are enabled for DB2 only

if @connection.adapter_name == "IBM_DB"

  tbspace_sql = "select TBSPACE from syscat.tables where tabname='#{table.upcase}'"

  table_space = @connection.select_one(tbspace_sql)["tbspace"]

  if table_space != "USERSPACE1"

    # A different tablespace was defined       

    tbl.print %Q(, :options => "IN #{table_space}")

  end

end

At this point, Diclofenac gel, ointment, cream, pill, spray, continuous-release, extended-release, just after the index method, we need to define the method foreign_keys:

def foreign_keys(stream)

  references = @connection.select_all("SELECT * FROM SYSCAT.REFERENCES")

  for reference in references

    constraint = reference["constname"]

    schema = reference["tabschema"]

    table = reference["tabname"]

    cols = reference["fk_colnames"]

    ref_schema = reference["reftabschema"]

    ref_table = reference["reftabname"]

    ref_cols = reference["pk_colnames"]

    if reference["updaterule"] == "R"

      update_action = "RESTRICT"

    else

      update_action = "NO ACTION"

    end
    delete_action = case reference["deleterule"]

                          when "A"

                            "NO ACTION"

                          when "R"

                            "RESTRICT"

                          when "C"

                            "CASCADE"

                          when "N"

                            "SET NULL"

                          end
    foreign_key_sql = "  execute("ALTER TABLE #{schema}.#{table} add 

CONSTRAINT #{constraint} FOREIGN KEY (#{cols.strip})n  

REFERENCES #{ref_schema}.#{ref_table} (#{ref_cols.strip}) 

ON UPDATE #{update_action} ON DELETE #{delete_action}n  

ENFORCED ENABLE QUERY OPTIMIZATION")n  "

    stream.print foreign_key_sql

    stream.puts

  end

end

As you can imagine, it is possible to prevent the need to modify the file directly, by simply extending the SchemaDumper class in, for example, a plugin. You would have to overwrite the original methods within the SchemaDumper class:

module ActiveRecord

  class SchemaDumper
    # ...
    def dump(stream)

      #...

    end
    private
    # ...
    def table(table, stream)

      # ...

    end
    # ...
    def foreign_keys(stream)

    # ...

    end
  end

end

It would be beneficial to aggregate several improvements in a “DB2 PowerPack” plugin of some sort, and it’s very likely that we will eventually work on publishing something like this.

June 20 2007 | How-to | 1 Comment »

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May 30 2007 | Announcements and How-to | Comments Off

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May 28 2007 | Announcements and How-to | Comments Off

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