How to generate sql file from Liquibase without DATABASECHANGELOG inserts? - ant

Question

I have the following problem : I need to produce migration file for a database in production. Currently I'm using ant and following ant task :
<liquibase:updateDatabase changeLogFile=db.changelog-master.xml" databaseRef="oracle-database" outputFile="out_ora.sql" />
But my file includes insert statements for DATABASECHANGELOG table. How can I produce output file without this statements ? (I wouldn't like to delete this statements manually or by some script later).

Answer 1

You can use this extension: https://github.com/liquibase/liquibase-nochangelogupdate
Just add the jar to your classpath and liquibase will not output any databasechangelog SQL

Answer 2

If you want to filter the insert/update from ChangeSets irrespective of Liquibase Insert/update statements retaining only the Create, Alter scripts.
Define a property with list of classes to be excluded
sqlgenerator.exclude=liquibase.statement.core.InsertOrUpdateStatement,liquibase.statement.core.InsertStatement,liquibase.statement.core.UpdateStatement,liquibase.statement.core.GetNextChangeSetSequenceValueStatement,liquibase.statement.core.MarkChangeSetRanStatement,liquibase.statement.core.RemoveChangeSetRanStatusStatement,liquibase.statement.core.UpdateChangeSetChecksumStatement
Implement a SQL Generator class that filters all the SQL statements falls into the class category listed above.
Spring injects the property into the class. Be sure to create the class under the package "liquibase.sqlgenerator.ext".
#Component
public class FilteredSQLGenerator extends AbstractSqlGenerator<AbstractSqlStatement> {
private static final Logger LOGGER = Logger.getLogger(FilteredSQLGenerator.class);
private static String[] excludeArr = new String[0];
#Value("${sqlgenerator.exclude}")
private String exclude;
#PostConstruct
public void init() {
LOGGER.debug(" Exclude List set to : " + exclude);
if (StringUtils.isNotBlank(exclude)) {
excludeArr = StringUtils.split(exclude, ',');
}
}
#Override
public ValidationErrors validate(AbstractSqlStatement statement, Database database, SqlGeneratorChain sqlGeneratorChain) {
return sqlGeneratorChain.validate(statement, database);
}
#Override
public int getPriority() {
return 1000;
}
#Override
public Sql[] generateSql(AbstractSqlStatement statement, Database database, SqlGeneratorChain sqlGeneratorChain) {
String clazzName = statement.getClass().getName();
for (String exclude : excludeArr) {
if (exclude.equals(clazzName)) {
return new Sql[0];
}
}
return sqlGeneratorChain.generateSql(statement, database);
}
}