[英]liquibase - how to generate the sql script from the changelog after comparing two databases using java?
我將兩個數據庫與liquibase java API 3.3.2進行了比較,然后生成了changelog.xml文件。 現在,我想生成將更新目標數據庫的sql腳本。 這是我的代碼:
Database database;
Database database2;
try {
database = CommandLineUtils.createDatabaseObject(org.postgresql.Driver.class.getClassLoader(), "jdbc:postgresql://localhost:5432/loan", "postgres", "", "org.postgresql.Driver", null, null, false, false, null, null, null, null, null);
database2=CommandLineUtils.createDatabaseObject(org.postgresql.Driver.class.getClassLoader(), "jdbc:postgresql://localhost:5432/loan2", "postgres", "", "org.postgresql.Driver", null, null, false, false, null, null, null, null, null);
Liquibase liquibase = new Liquibase("", new FileSystemResourceAccessor(), database);
DiffResult result = liquibase.diff(database, database2, new CompareControl());
DiffToChangeLog diffLog = new DiffToChangeLog(result, new DiffOutputControl());
diffLog.print(System.out);
//new DiffToReport(result, System.out).print();
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
編輯這是我的工作方式,這要感謝Steve donie:
Database database;
Database database2;
try {
database = CommandLineUtils.createDatabaseObject(org.postgresql.Driver.class.getClassLoader(), "jdbc:postgresql://localhost:5432/loan", "postgres", "", "org.postgresql.Driver", null, null, false, false, null, null, null, null, null);
database2= CommandLineUtils.createDatabaseObject(org.postgresql.Driver.class.getClassLoader(), "jdbc:postgresql://localhost:5432/loan2", "postgres", "", "org.postgresql.Driver", null, null, false, false, null, null, null, null, null);
// generate the changelog that contains the differences
CommandLineUtils.doDiffToChangeLog("changelog.xml", database, database2, new DiffOutputControl(), null, null);
// generate the sql script from the changeLog (without executing it)
File sql = new File("output.sql");
Liquibase liquibase = new Liquibase("changelog.xml", new FileSystemResourceAccessor(), database);
liquibase.update("Update", new FileWriter(sql));
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
解決此問題的一種方法是查看從命令行運行時Liquibase本身的功能。 在這種情況下,通常將使用diffChangeLog命令創建更改日志,然后運行updateSQL生成更新數據庫所需的SQL。 看着為Liquibase源代碼liquibase.integration.commandline.Main
,我看到它做什么是使用Liquibase.update()方法與參數指定一個非空輸出作家 (這是SQL將文件保存到)。
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