高性能数据库搜索算法的Java实现思路

// 数据库记录类
class Record {
    int id;
    String content;
    
    // 构造函数
    public Record(int id, String content) {
        this.id = id;
        this.content = content;
    }
    
    // 获取ID
    public int getId() {
        return id;
    }
    
    // 获取内容
    public String getContent() {
        return content;
    }
}

// 数据库搜索类
class DatabaseSearch {
    Map<String, List<Record>> invertedIndex; // 倒排索引
    
    // 构造函数
    public DatabaseSearch(List<Record> records) {
        invertedIndex = new HashMap<>();
        buildInvertedIndex(records);
    }
    
    // 建立倒排索引
    private void buildInvertedIndex(List<Record> records) {
        for (Record record : records) {
            String[] keywords = record.getContent().split(" ");
            for (String keyword : keywords) {
                if (!invertedIndex.containsKey(keyword)) {
                    invertedIndex.put(keyword, new ArrayList<>());
                }
                invertedIndex.get(keyword).add(record);
            }
        }
    }
    
    // 执行搜索
    public List<Record> search(String keyword) {
        if (!invertedIndex.containsKey(keyword)) {
            return new ArrayList<>();
        }
        return invertedIndex.get(keyword);
    }
}

// 示例代码的使用
public class Main {
    public static void main(String[] args) {
        List<Record> records = new ArrayList<>();
        records.add(new Record(1, "This is a test record"));
        records.add(new Record(2, "Another test record"));
        records.add(new Record(3, "Yet another test record"));
        
        DatabaseSearch dbSearch = new DatabaseSearch(records);
        
        String keyword = "test";
        List<Record> result = dbSearch.search(keyword);
        
        System.out.println("Search results for keyword "" + keyword + "":");
        for (Record record : result) {
            System.out.println("ID: " + record.getId() + ", Content: " + record.getContent());
        }
    }
}