In Outsystems all, the standard db rules are applicable. yes you can change the constraint but again if you already have data in that table which do not follow that constraint then definitely, you will face the issues. for your above queries:ġ.New column added to the existing table,- yes you can addĢ.Modifying the constraints to the existing table- yes but keep in mind, if data is already exist in the same table may not have conflict with it.ģ.Adding new table to existing table.- yes you can add new table.Ĥ.Modifying the constraints to existing column in the table.
Usually these changes start from development environment not from QA. Again just to re-emphasize, the same is applicable to all the database types supported by liquibase. Note that if you do not see the expected difference in the output, the answer lies in the permissions on the user which is used to establish the database connection. Liquibase can diff different database types, but the results may be skewed due to differences in case and data types.
This is done with the diffChangeLog command: On successful run, we should see like below output:Īnd like other database diff tools, Liquibase can also generate a changelog for the missing objects. However, we can use liquibase to do this as well.įrom liquibase perspective, we can run below command to compare the databases: Doing this manually can be cumbersome and error prone as there can be any number of objects inside the database. This can be particularly helpful in determining how your dev database differs from production and why in one environment you are able to reproduce the bug but not in the other environment. It is useful from time to time when you want to compare databases to observe how they differ mostly in terms of schema and may be data. That are the topics for another blog post in future :). And we can also automate the mechanism used to invoke those tools. Alternatively, we can run database specific tools / languages to export this information in Database specific native SQL, and arrange in nice hierarchy. Same goes for other objects like tables etc. However we can easily write a script to parse the file and then categorize the information in nice hierarchy like we can store 1 stored procedure per file and make all stored procedures under a directory named stored procedures. However the commercial version does not have this limitation.Īnother one of the limitations with the exported data/schema is that it is one large changeLog file with possibly thoushands of changeSets. It does not export the following types of objects: Stored procedures, functions, packages, Triggers. Note that the open source version of Liquibase currently has some limitations. Liquibase allows you to do this with the generateChangeLog option:īelow is one of the snippets from file generated in my case:Īgain, by default, it will export information for dbo schema. So we need not be typing all parameters and values again.
Note that we have already learned how to use liquibase.properties file to minimize the information that needs to be typed while using Liquibase command.
It is one of the sample databases available from Microsoft. We’ll use the same database as we have been using till now, AdventureWorks2017, to export schema. Also, sometimes you would like to compare databases (both schema and data, again to some extent) to figure out issues, like why a special behavior is being observed in the dev environment but not in your production. Though Liquibase does not depend upon the existing schema, it is still a good idea to export all of the existing schema and possibly data (to some extent) and also put that information in the version control. Often times, when you start implementing Liquibase, you would already have a database which is being used by the application. In previous post, we discussed how we can use Liquibase to deploy changeLogs to databases.