java - 如何删除 java 中模式的所有数据库对象？

Question

在 Java 中清理(删除所有对象、表、 View 等)Oracle 数据库模式的最佳方法是什么？

我可以运行类似 https://stackoverflow.com/a/1690419/812093 的东西使用 Oracle 数据库客户端，但是否有可以使用的 Java 库或工具？我知道我可以读取连接元数据，遍历所有对象并删除它们，但我想知道以前是否有人这样做过，是否有任何开箱即用的东西可以使用。

我需要这个功能来设置集成测试- 清理数据库模式- 针对该模式执行一堆脚本以初始化数据库

Answer 1

飞行路线

它看起来像 Flyway数据库迁移工具提供了我一直在寻找的功能——至少如果你喜欢黑客 :) 因为我只需要这个功能来进行集成测试，所以它对我来说已经足够好了。让我分享我的代码。

添加Flyway和Oracle驱动依赖

<dependency>
    <groupId>org.flywaydb</groupId>
    <artifactId>flyway-core</artifactId>
    <version>5.1.1</version>
    <scope>test</scope>
</dependency>       
<dependency>
    <groupId>com.oracle</groupId>
    <artifactId>ojdbc7</artifactId>
    <version>12.1.0.2</version>
    <scope>provided</scope>
</dependency>   

执行脚本和清理数据库的主类

public class ExecuteScriptsAgainstOracle {

    public static void main(String args[]) throws Exception, SQLException {

        Flyway flyway = new Flyway();
        flyway.setDataSource("jdbc:oracle:thin:@xxx:1521:yyy", "zzz", "zzz");
        flyway.setTable("auto_schema_setup_flyway");

        Database<?> database = DatabaseFactory.createDatabase(flyway.getConfiguration(), false);

// clean the database (remove all objects of the schema)
        flyway.clean();
        flyway.setSkipDefaultResolvers(true);
        flyway.setResolvers(new MyMigrationResolver(database, flyway.getConfiguration()));
        flyway.migrate();
    }

}

列出要执行文件的MigrationResolver

包 org.flywaydb.core.internal.resolver.sql;

公共(public)类 MyMigrationResolver 实现 MigrationResolver {

private Database<?> database;
private Configuration configuration;
private int order = 0;

public MyMigrationResolver(Database<?> database, Configuration configuration) {
    this.database = database;
    this.configuration = configuration;
}

@Override
public Collection<ResolvedMigration> resolveMigrations() {

    Collection<ResolvedMigration> scripts = new LinkedList<ResolvedMigration>();
    scripts.add(script(folder1\\somescript.dml"));
    scripts.add(script("folder2\\someOtherScript.sql"));

    return scripts;
}

private ResolvedMigrationImpl script(String scriptName) {


    String baseFolder = "target\\scripts\\";
    order++;

    ResolvedMigrationImpl migration = new ResolvedMigrationImpl();
    migration.setScript(baseFolder+scriptName);
    migration.setType(MigrationType.SQL);
    migration.setDescription(""+String.format("%03d",order)+" "+scriptName);
    migration.setExecutor(new SqlMigrationExecutor(database,
            new FileSystemResource(migration.getScript(), configuration.getEncoding()),
            new PlaceholderReplacer() {

                @Override
                public String replacePlaceholders(String input) {

                    // just remove parts of the sql that flyway can't deal with
                    input = StringUtils.replace(input, "WHENEVER SQLERROR EXIT SQL.SQLCODE ROLLBACK;", "");
                    input = StringUtils.replace(input, "SET DEFINE OFF;", "");

                    return input;
                }

                @Override
                public Map<String, String> getPlaceholderReplacements() {
                    return null;
                }
            }
            , configuration));
    return migration;
}