以编程方式设置Flyway占位符

Question

我有一个非常简单的Spring Boot应用程序，它使用Flyway进行数据库迁移。我想在迁移开始之前使用Spring配置类以编程方式设置Flyway占位符。

@Configuration
public class FlywayConfiguration {

  @Autowired
  private Flyway flyway;

  @Value("${threedsserver.db.tableSpaces.data:pg_default}")
  private String tablespaceData;

  @Value("${threedsserver.db.tableSpaces.index:pg_default}")
  private String tablespaceIndex;

  @Value("${threedsserver.db.tableSpaces.lob:pg_default}")
  private String tablespaceLob;

  @PostConstruct
  void setFlywayPlaceholders() {
    Map<String, String> placeholders = flyway.getPlaceholders();
    placeholders.put("tablespace_data", tablespaceData);
    placeholders.put("tablespace_index", tablespaceIndex);
    placeholders.put("tablespace_lob", tablespaceLob);
    flyway.setPlaceholders(placeholders);
  }
}

No value provided for placeholder expressions: ${tablespace_data}

我假设迁移在配置文件被处理之前就开始了。怎么解决这个？我不想使用application.properties设置flyway占位符，但所有其他属性（如spring.flyway.user、spring.flyway.password等）都希望由application.properties设置。

Answer 1

您可以使用FlywayConfigurationCustomizer，如下所示：

import org.flywaydb.core.api.configuration.FluentConfiguration
import org.springframework.boot.autoconfigure.flyway.FlywayConfigurationCustomizer
import org.springframework.context.annotation.Configuration

@Configuration
class CustomFlywayConfiguration : FlywayConfigurationCustomizer {
    override fun customize(configuration: FluentConfiguration?) {
        configuration?.placeholders?.put("tablespace_index", "some_value")
    }
}

我这里有spring boot flyway集成的示例