How to use one ChangeLog inside another in Liquibase? - liquibase

Question

I have two changeLog which has changesets to create two tables .
The changelog having changeset to create person
<?xml version="1.0" encoding="UTF-8"?>
<databaseChangeLog
xmlns="http://www.liquibase.org/xml/ns/dbchangelog"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:ext="http://www.liquibase.org/xml/ns/dbchangelog-ext"
xsi:schemaLocation="http://www.liquibase.org/xml/ns/dbchangelog http://www.liquibase.org/xml/ns/dbchangelog/dbchangelog-3.0.xsd
http://www.liquibase.org/xml/ns/dbchangelog-ext http://www.liquibase.org/xml/ns/dbchangelog/dbchangelog-ext.xsd">
<changeSet id="1" author="nvoxland">
<createTable tableName="person">
<column name="id" type="int" autoIncrement="true">
<constraints primaryKey="true" nullable="false" />
</column>
<column name="firstname" type="varchar(50)" />
<column name="lastname" type="varchar(50)">
<constraints nullable="false" />
</column>
<column name="state" type="char(2)" />
<column name="district" type="char(2)" />
<column name="city" type="char(2)" />
</createTable>
</changeSet>
</databaseChangeLog>
and the changelog to create passport
<?xml version="1.0" encoding="UTF-8"?>
<databaseChangeLog
xmlns="http://www.liquibase.org/xml/ns/dbchangelog"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:ext="http://www.liquibase.org/xml/ns/dbchangelog-ext"
xsi:schemaLocation="http://www.liquibase.org/xml/ns/dbchangelog http://www.liquibase.org/xml/ns/dbchangelog/dbchangelog-3.0.xsd
http://www.liquibase.org/xml/ns/dbchangelog-ext http://www.liquibase.org/xml/ns/dbchangelog/dbchangelog-ext.xsd">
<changeSet id="2" author="nvoxland">
<createTable tableName="passport">
<column name="passportNo" type="int">
<constraints primaryKey="true" nullable="false" />
</column>
</createTable>
</changeSet>
</databaseChangeLog>
I want to create a new changeset in a separate changelog which can use the above two changelog and add a foreignkey constraint between person and passport.
Something like this
<?xml version="1.0" encoding="UTF-8"?>
<databaseChangeLog
xmlns="http://www.liquibase.org/xml/ns/dbchangelog"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:ext="http://www.liquibase.org/xml/ns/dbchangelog-ext"
xsi:schemaLocation="http://www.liquibase.org/xml/ns/dbchangelog http://www.liquibase.org/xml/ns/dbchangelog/dbchangelog-3.0.xsd
http://www.liquibase.org/xml/ns/dbchangelog-ext http://www.liquibase.org/xml/ns/dbchangelog/dbchangelog-ext.xsd">
<changeSet id="3" author="nvoxland">
import changeset 1 & 2
add foreign-key between person & passport
</changeSet>
</databaseChangeLog>
Is this possible using Liquibase? Please suggest the possible ways.

Answer 1

If I get your question right, you can use master-changelog.xml file and specify all your changelog files there.
Your master-changelog may look like this:
<databaseChangeLog
xmlns="http://www.liquibase.org/xml/ns/dbchangelog"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://www.liquibase.org/xml/ns/dbchangelog
http://www.liquibase.org/xml/ns/dbchangelog/dbchangelog-3.1.xsd">
<include file="changelog/changelog_file_1.xml" relativeToChangelogFile="true"/>
<include file="changelog/changelog_file_2.xml" relativeToChangelogFile="true"/>
<include file="changelog/changelog_file_3.xml" relativeToChangelogFile="true"/>
</databaseChangeLog>
changelog files will be executed in the provided order, so the third changelog will already have all the needed data available.
So in your changelog_file_3.xml you'll have a changeSet with <addForeignKeyConstraint>.
By the way, you don't need to create separate changelog for each changeset.