使用 gh-ost 与 flyway/liquibase 等工具集成的在线迁移

Question

我一直在研究如何使用 gh-ost，但似乎尚未与 flyway/liquibase 等工具集成。 gh-ost 必须像这样运行：

./gh-ost --host=XXX--user=XXXX--password=XXXX--database=XXX--table=XXX --alter="ADD COLUMN XXX INT NOT NULL DEFAULT '0'"

似乎 table 名称和 "alter" sql 命令是 gh-ost 命令参数的一部分。

有什么方法可以让我使用 gh-ost 的好处（在线模式迁移）以及 flyway/liquibase 之类的工具所提供的功能？

Answer 1

看起来不简单。使用 Flyway，您可以使用 Custom Migration resolvers & executors 将特殊文件包装在 gh-ost 命令中。对于概念验证，您可以使用 java class 迁移来调用操作系统运行 Gh-ost 命令。

Answer 2

private Flyway flyway = new Flyway();

GhostMigrationResolver ghostMigrationResolver = new GhostMigrationResolver();
flyway.setResolvers(ghostMigrationResolver);

public class GhostMigrationResolver extends BaseMigrationResolver {

    private Set<String> ghostScriptFiles = new HashSet<>();

    public void addGhostScript(String ghostUpdateScript) {
        ghostScriptFiles.add(ghostUpdateScript);
    }

    @Override
    public Collection<ResolvedMigration> resolveMigrations() {
        Set<ResolvedMigration> resolvedMigrations = new HashSet<>();
        for (String ghostScriptFile : ghostScriptFiles) {
            GhostResolvedMigration ghostResolvedMigration = new GhostResolvedMigration();
            ghostResolvedMigration.setScript(ghostScriptFile);
            GhostExecutor executor = new GhostExecutor();
            executor.setGhostScriptFile(ghostScriptFile);
            ghostResolvedMigration.setExecutor(executor);
            ghostResolvedMigration.setDescription(ghostScriptFile);
            ghostResolvedMigration.setVersion(MigrationVersion.fromVersion(ghostScriptFile.substring(1, ghostScriptFile.indexOf("__"))));
            ghostResolvedMigration.setType(MigrationType.CUSTOM);
            resolvedMigrations.add(ghostResolvedMigration);
        }
        return resolvedMigrations;
    }
}

public class GhostExecutor implements MigrationExecutor {

    @Override
    public void execute(Connection connection) throws SQLException {
    //call ghost here
    }
}

使用 gh-ost 与 flyway/liquibase 等工具集成的在线迁移

Online migration with gh-ost integrated with tools like flyway/liquibase

ghost