如何使用Java技术实现高性能的数据库搜索策略与方法？

import java.sql.*;

public class DatabaseSearch {
    public static void main(String[] args) {
        try {
            // 连接数据库
            Connection conn = DriverManager.getConnection("jdbc:mysql://localhost:3306/test", "root", "123456");
            
            // 创建并执行SQL查询语句
            String sql = "SELECT * FROM users WHERE age > ?";
            PreparedStatement stmt = conn.prepareStatement(sql);
            stmt.setInt(1, 18);
            ResultSet rs = stmt.executeQuery();
            
            // 处理查询结果
            while (rs.next()) {
                String name = rs.getString("name");
                int age = rs.getInt("age");
                System.out.println("Name: " + name + ", Age: " + age);
            }
            
            // 关闭连接
            rs.close();
            stmt.close();
            conn.close();
        } catch (SQLException e) {
            e.printStackTrace();
        }
    }
}

import org.elasticsearch.action.search.SearchResponse;
import org.elasticsearch.action.search.SearchType;
import org.elasticsearch.client.transport.TransportClient;
import org.elasticsearch.common.settings.Settings;
import org.elasticsearch.common.transport.InetSocketTransportAddress;
import org.elasticsearch.common.unit.TimeValue;
import org.elasticsearch.index.query.QueryBuilders;
import org.elasticsearch.search.SearchHit;
import org.elasticsearch.transport.client.PreBuiltTransportClient;

import java.net.InetAddress;
import java.net.UnknownHostException;

public class DatabaseSearch {
    public static void main(String[] args) {
        try {
            // 连接Elasticsearch
            Settings settings = Settings.builder()
                    .put("cluster.name", "elasticsearch")
                    .build();
            TransportClient client = new PreBuiltTransportClient(settings)
                    .addTransportAddress(new InetSocketTransportAddress(InetAddress.getByName("localhost"), 9300));
            
            // 创建并执行全文搜索查询
            SearchResponse response = client.prepareSearch("index")
                    .setTypes("type")
                    .setSearchType(SearchType.DFS_QUERY_THEN_FETCH)
                    .setQuery(QueryBuilders.matchQuery("content", "keyword"))
                    .setSize(10)
                    .setTimeout(new TimeValue(60000))
                    .execute()
                    .actionGet();
                    
            // 处理查询结果
            for (SearchHit hit : response.getHits().getHits()) {
                String title = hit.getSource().get("title").toString();
                String content = hit.getSource().get("content").toString();
                System.out.println("Title: " + title + ", Content: " + content);
            }
            
            // 关闭连接
            client.close();
        } catch (UnknownHostException e) {
            e.printStackTrace();
        }
    }
}