Java数据库搜索优化策略与技巧落地解析

// 创建索引
CREATE INDEX idx_user_id ON user(id); 

// 使用索引查询
SELECT * FROM user WHERE id = 1;

CriteriaBuilder cb = session.getCriteriaBuilder();
CriteriaQuery<User> query = cb.createQuery(User.class);
Root<User> root = query.from(User.class);
query.select(root).where(cb.equal(root.get("id"), 1));
Query<User> q = session.createQuery(query);
List<User> users = q.getResultList();

// 查询时先检查缓存中是否存在
String key = "user:" + id;
String userStr = cache.get(key);

if (userStr == null) {
    // 从数据库中查询
    User user = userDao.findById(id);
    if (user != null) {
        // 将查询结果缓存到Redis中
        cache.set(key, user.toString());
    }
} else {
    // 取出缓存数据
    User user = new User(userStr);
    // ...
}

HikariConfig config = new HikariConfig();
config.setJdbcUrl("jdbc:mysql://localhost:3306/test");
config.setUsername("root");
config.setPassword("password");

HikariDataSource dataSource = new HikariDataSource(config);
Connection connection = dataSource.getConnection();

// 使用连接进行数据库操作

connection.close(); // 释放连接