解析Spring Boot中的数据库迁移工具

import org.flywaydb.core.Flyway;
import org.springframework.boot.autoconfigure.flyway.FlywayMigrationStrategy;
import org.springframework.boot.autoconfigure.flyway.FlywayProperties;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.core.io.ResourceLoader;
 
@Configuration
public class DatabaseMigrationConfig {
 
    @Bean
    public FlywayMigrationStrategy flywayMigrationStrategy() {
        return flyway -> {
            // 自定义数据库迁移策略
            // 例如，可以在此处检查迁移前的版本和迁移后的版本
            int currentVersion = flyway.info().current().getVersion();
            System.out.println("当前数据库版本: " + currentVersion);
        };
    }
 
    @Bean
    public Flyway flyway(FlywayProperties flywayProperties, ResourceLoader resourceLoader, FlywayMigrationStrategy migrationStrategy) {
        Flyway flyway = Flyway.configure()
                .dataSource(flywayProperties.getUrl(), flywayProperties.getUser(), flywayProperties.getPassword())
                .baselineOnMigrate(flywayProperties.isBaselineOnMigrate())
                .baselineVersion(flywayProperties.getBaselineVersion())
                .baselineDescription(flywayProperties.getBaselineDescription())
                .locations(flywayProperties.getLocations().toArray(new String[0]))
                .table(flywayProperties.getTable())
                .outOfOrder(flywayProperties.isOutOfOrder())
                .resourceLoader(resourceLoader)
                .load();
 
        // 使用自定义的迁移策略
        migrationStrategy.migrate(flyway);
 
        return flyway;
    }
}

这个配置类定义了一个自定义的FlywayMigrationStrategy，并在flyway bean中使用了这个策略。开发者可以在自己的项目中使用类似的方法来定制数据库迁移的行为。