数据库搜索效率提升的Java技术实用方法应用探讨

// 创建索引
String createIndexSql = "CREATE INDEX index_name ON table_name (column_name)";
try (PreparedStatement statement = connection.prepareStatement(createIndexSql)){
    statement.executeUpdate();
} catch (SQLException e) {
    e.printStackTrace();
}

// 使用LIMIT语句
String querySql = "SELECT * FROM table_name LIMIT 10";
try (Statement statement = connection.createStatement()){
    ResultSet resultSet = statement.executeQuery(querySql);
    // 处理查询结果
    while (resultSet.next()) {
        // 处理查询结果
    }
} catch (SQLException e) {
    e.printStackTrace();
}

// 预编译语句
String querySql = "SELECT * FROM table_name WHERE column_name = ?";
try (PreparedStatement statement = connection.prepareStatement(querySql)){
    statement.setString(1, "value");
    ResultSet resultSet = statement.executeQuery();
    // 处理查询结果
    while (resultSet.next()) {
        // 处理查询结果
    }
} catch (SQLException e) {
    e.printStackTrace();
}

// 多线程查询
ExecutorService executorService = Executors.newFixedThreadPool(10);
List<Future<ResultSet>> results = new ArrayList<>();

for (int i = 0; i < 10; i++) {
    Callable<ResultSet> queryTask = () -> {
        // 执行查询操作
        String querySql = "SELECT * FROM table_name WHERE column_name = ?";
        try (PreparedStatement statement = connection.prepareStatement(querySql)) {
            statement.setString(1, "value");
            return statement.executeQuery();
        }
    };
    results.add(executorService.submit(queryTask));
}

for (Future<ResultSet> result : results) {
    // 处理查询结果
    ResultSet resultSet = result.get();
    while (resultSet.next()) {
        // 处理查询结果
    }
}

executorService.shutdown();

// 使用Ehcache缓存
CacheManager cacheManager = CacheManager.getInstance();
Cache cache = cacheManager.getCache("myCache");

// 查询缓存
Element element = cache.get("key");
if (element != null) {
    // 缓存命中，直接返回结果
    return element.getObjectValue();
} else {
    // 缓存未命中，进行数据库查询
    Object result = // 执行数据库查询操作
    // 将查询结果存入缓存
    cache.put(new Element("key", result));
    return result;
}