Re : Generate XML/ SQL output with data types of target database

Actually, it is necessary to manually correct the data types in the generated file. Data types are not converted automatically.

For example:

1. ...
2. <changeSet author="Alexey (generated)" id="1409146335011-53">
3.    <createTable tableName="TABLE1A">
4.       <!-- replace INT8 to NUMBER(16) for Oracle (for example) -->
5.       <column name="total_pk" type="INT8">           
6.          <constraints nullable="false"/>
7.       </column>
8.       <!-- replace INT4 to NUMBER(10) for Oracle (for example) -->
9.       <column name="form_fk" type="INT4"> 
10.          <constraints nullable="false"/>
11.       </column>   
12. ...

After that execute the command:

1. liquibase 
2.    --driver=oracle.jdbc.OracleDriver 
3.    --classpath="C:\db_drivers\ojdbc14.jar" 
4.    --changeLogFile="./postgresql_changelog.xml" 
5.    --url="jdbc:oracle:thin:@ip_here:orabeta" 
6.    --username=*** 
7.    --password=***
8.    update

The structure will be generated on the target database. Is similarly possible migrate the data (option --diffTypes = "data").

But, really, can be used "abstract" data types, as write in the documentation: Liquibase, Column tag

To help make scripts database-independent, the following “generic” data types will be converted to the correct database implementation: BOOLEAN CURRENCY UUID CLOB BLOB DATE DATETIME TIME BIGINT

Also, specifying a java.sql.Types.* type will be converted to the correct type as well. If needed, precision can be included. Here are some examples: java.sql.Types.TIMESTAMPjava.sql.Types.VARCHAR(255)

And possible to make the copy of structure without DDL (and data without DML).