Dear Nathan,
It's working fine for my project. When running unit test, it will bring up an
H2 DB in embedded mode and run the changelog against it.
So for unit test, we don't need an Oracle DB available for DAOs testing, and is
running a lot faster then using Oracle.
No major problem observe so far, except the column types I mentioned and we
find one Hibernate Query need to be modified to have it able to run on H2.
Let me know if you need more information.
Cheers
Clarence
From: Voxland, Nathan
Sent: Thursday, January 08, 2009 5:59 AM
To: liquibase-user@lists.sourceforge.net
Subject: Re: [Liquibase-user] Liquibase - different column type
fordifferentdatabase vendor
By the way, I had also been thinking of using H2 as a database to run
unit/integration tests against rather than our "real" database to make them run
faster. How is it working for you? Are they running noticeably faster? Are
you running into any problems and/or missed bugs?
Nathan
From: Clarence Ho [mailto:clare...@clarenceh.com]
Sent: Wednesday, January 07, 2009 12:26 AM
To: liquibase-user@lists.sourceforge.net; Voxland, Nathan
Subject: [Liquibase-user] Liquibase - different column type for
differentdatabase vendor
Hi,
I have a question on using Liquibase and would like to seek for advice.
I have an application that use Oracle as the backend DB, and I created a change
log for creating the schema.
However, when running unit test, I will bought up an in-memory H2 database and
run the same change log file against the DB for DAO unit testing. The objective
is to allow the unit test to run without an Oracle DB available.
I have one problem when dealing with timestamp columns.
In Oracle, I am using "TIMESTAMP WITH LOCAL TIME ZONE" as the column type. A
segment of the change log was as follows:
<createTable tableName="COUNTRY">
<column name="AUDIT_CREATE_TS" type="TIMESTAMP WITH LOCAL TIME
ZONE">
<constraints nullable="false"/>
</column>
</createTable>
However, when running unit test, obvious H2 doesn't support this data type, and
Liquibase will fail. I have to change to type="TIMESTAMP" for it to work.
>From the manual, I understand that I can use one of the following method to
>fulfill what I want:
1. Create a custom database class to handle the H2 database creation
2. Use parameter (e.g. TimestampColumnType="TIMESTAMP") and pass the parameter
into Liquibase when run.
However, I just thinking about it will be great if Liquibase support something
like "variables" which can be configure by DB type. For example, in the
changelog, I can define a variable in the preCondition (just an example I can
think of):
<preConditions>
<or>
<dbms type="oracle" />
<dbms type="h2" />
</or>
</preConditions>
<setVariable name="timestampType">
<value="TIMESTAMP WITH LOCAL TIME ZONE" dbms="oracle"/>
<value="TIMESTAMP" dbms="h2"/>
</setVariable>
And then I can change my change log fragment to:
<createTable tableName="COUNTRY">
<column name="AUDIT_CREATE_TS" type=${timestampType}>
<constraints nullable="false"/>
</column>
</createTable>
In this case, then I can define the very DB specific column type that we want
for different DB.
I think the advantage of this approach is that it allows more consistent change
log instead of passing different parameters when running Liquibase.
Any advice are welcome.
Thanks
Clarence
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