Spring @Conditional基于数据库表中的值

import org.springframework.context.annotation.Condition;
import org.springframework.context.annotation.ConditionContext;
import org.springframework.core.type.AnnotatedTypeMetadata;

import javax.sql.DataSource;
import java.sql.Connection;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;

public class DatabaseEnabledCondition implements Condition {

    @Override
    public boolean matches(ConditionContext context, AnnotatedTypeMetadata metadata) {
        DataSource dataSource = context.getEnvironment().getProperty("datasource", DataSource.class);
        if (dataSource == null) {
            throw new IllegalStateException("DataSource not found");
        }

        try (Connection connection = dataSource.getConnection();
             Statement statement = connection.createStatement();
             ResultSet resultSet = statement.executeQuery("SELECT enabled FROM config WHERE name = 'myBean'")) {

            if (resultSet.next()) {
                return resultSet.getBoolean("enabled");
            }
        } catch (SQLException e) {
            throw new RuntimeException("Failed to query database", e);
        }

        return false;
    }
}

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Conditional;
import org.springframework.context.annotation.Configuration;

@Configuration
public class AppConfig {

    @Bean
    @Conditional(DatabaseEnabledCondition.class)
    public MyBean myBean() {
        return new MyBean();
    }
}