Java与腾讯云API对接：如何实现云数据库操作？

<dependencies>
    <!-- 腾讯云SDK -->
    <dependency>
        <groupId>com.qcloud</groupId>
        <artifactId>qcloud-sdk-java</artifactId>
        <version>2.0.0</version>
    </dependency>
</dependencies>

secretId=YourSecretId
secretKey=YourSecretKey
region=ap-guangzhou
dbInstanceId=YourDBInstanceId

import com.qcloud.cos.COSClient;
import com.qcloud.cos.ClientConfig;
import com.qcloud.cos.auth.*;
import com.qcloud.cos.exception.CosClientException;
import com.qcloud.cos.region.*;
import java.io.*;
import java.util.Properties;

public class DBUtil {
    private String secretId;
    private String secretKey;
    private String region;
    private String dbInstanceId;
    
    public DBUtil() {
        loadConfig();
    }
    
    private void loadConfig() {
        try {
            Properties properties = new Properties();
            InputStream inputStream = this.getClass().getClassLoader().getResourceAsStream("config.properties");
            properties.load(inputStream);
            secretId = properties.getProperty("secretId");
            secretKey = properties.getProperty("secretKey");
            region = properties.getProperty("region");
            dbInstanceId = properties.getProperty("dbInstanceId");
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
    
    public COSClient getDBClient() {
        COSCredentials credentials = new BasicCOSCredentials(secretId, secretKey);
        ClientConfig clientConfig = new ClientConfig(new Region(region));
        return new COSClient(credentials, clientConfig);
    }
}

import com.qcloud.cos.COSClient;
import com.qcloud.cos.model.*;
import java.util.*;

public class Example {
    public static void main(String[] args) {
        // 创建数据库连接
        DBUtil dbUtil = new DBUtil();
        COSClient client = dbUtil.getDBClient();
        
        // 定义查询语句
        String sql = "SELECT * FROM table";
        
        // 执行查询操作
        try {
            SelectObjectContentRequest request = new SelectObjectContentRequest();
            request.setBucketName("bucket-name");
            request.setKey("object-key");
            request.setExpressionType(ExpressionType.SQL);
            request.setInputSerialization(new InputSerialization().withCompressionType(CompressionType.GZIP)
                    .withJSON(new JSONInput().withType("LINES")));
            request.setOutputSerialization(new OutputSerialization().withJSON(new JSONOutput()));
            request.setExpression(sql);
            
            SelectObjectContentResult result = 
                    client.selectObjectContent(request);
            
            // 处理查询结果
            S3SelectResultEventStream resultStream = result.getPayload().getRecordsInputStream();
            BufferedReader reader = new BufferedReader(new InputStreamReader(resultStream));
            String line;
            while ((line = reader.readLine()) != null) {
                System.out.println(line);
            }
            
        } catch (Exception e) {
            e.printStackTrace();
        }
        
        // 关闭数据库连接
        client.shutdown();
    }
}