Java スキルの経験の共有とデータベース検索効果の最適化のためのベスト プラクティスの概要

// 创建数据库连接
Connection connection = DriverManager.getConnection("jdbc:mysql://localhost/mydatabase", "username", "password");

// 创建索引
Statement statement = connection.createStatement();
String createIndexQuery = "CREATE INDEX idx_name ON users (name)";
statement.executeUpdate(createIndexQuery);

// 关闭连接
statement.close();
connection.close();

// 创建数据库连接
Connection connection = DriverManager.getConnection("jdbc:mysql://localhost/mydatabase", "username", "password");

// 创建查询语句
String query = "SELECT * FROM users WHERE name LIKE 'John%'";

// 执行查询
Statement statement = connection.createStatement();
ResultSet resultSet = statement.executeQuery(query);

// 处理结果
while (resultSet.next()) {
    String name = resultSet.getString("name");
    System.out.println(name);
}

// 关闭连接
resultSet.close();
statement.close();
connection.close();

// 创建数据库连接
Connection connection = DriverManager.getConnection("jdbc:mysql://localhost/mydatabase", "username", "password");

// 创建批量操作
Statement statement = connection.createStatement();

// 添加批量操作语句
statement.addBatch("INSERT INTO users (name) VALUES ('John')");
statement.addBatch("INSERT INTO users (name) VALUES ('Jane')");
statement.addBatch("INSERT INTO users (name) VALUES ('Tom')");

// 执行批量操作
int[] result = statement.executeBatch();

// 关闭连接
statement.close();
connection.close();

// 创建缓存
Map<String, List<User>> cache = new HashMap<>();

// 搜索缓存
String keyword = "John";
List<User> result = cache.get(keyword);

// 如果缓存中不存在结果，则从数据库中搜索
if (result == null) {
    Connection connection = DriverManager.getConnection("jdbc:mysql://localhost/mydatabase", "username", "password");
    String query = "SELECT * FROM users WHERE name LIKE '%" + keyword + "%'";

    Statement statement = connection.createStatement();
    ResultSet resultSet = statement.executeQuery(query);

    result = new ArrayList<>();
    while (resultSet.next()) {
        String name = resultSet.getString("name");
        result.add(new User(name));
    }

    // 缓存结果
    cache.put(keyword, result);

    // 关闭连接
    resultSet.close();
    statement.close();
    connection.close();
}

// 处理结果
for (User user : result) {
    System.out.println(user.getName());
}