通过 Java API 使用 Liquibase 生成数据导出 SQL 文件

Question

would like to generate an SQL file from liquibase via Java code replicating this command

java -jar liquibase.jar --changeLogFile="./data/filename" --diffTypes="data" generateChangeLog

I am using this as a replacement for a home grown SQL backup Java class

Answer 1

Something like the following should do what you want I think:

ResourceAccessor resourceAccessor = new FileSystemResourceAccessor();
Database db = DatabaseFactory.getInstance().findCorrectDatabaseImplementation(new JdbcConnection(yourJdbcConnection));
Liquibase liquibase = new Liquibase("data/filename", resourceAccessor, db);
try (Writer writer = new OutputStreamWriter(System.out)) {
    liquibase.update((Contexts) null, writer);
}

Answer 2

You can use an util method liquibase.integration.commandline.CommandLineUtils#doGenerateChangeLog from the liquibase-core.jar . It uses same parameters as in your example with a command line.

In my project there is example of using this method:https://github.com/0x100/liquibase-backuper-spring-boot-starter . This is a starter for Spring Boot, but I think it's easy to understand how to use the method.