从db resultset java中检索单列的多行[关闭]

Question

谁能帮助我使用 java 从 db 结果集中检索单列的多行

例如：

id amount
1  245.0
2  245.0

Answer 1

这是一个简单的例子：

try {
    Class.forName("driver");
    Connection connection = DriverManager.getConnection("url", "username", "password");
    Statement statement = connection.createStatement();
    ResultSet result = statement.executeQuery("SELECT id FROM my_table");
    List<Integer> list = new ArrayList<>();

    while (result.next()) {
      list.add(result.getInt("id"));
    }

    //you can loop throw your list and do your action here

} catch (ClassNotFoundException | SQLException e) {
}

您可以在此处阅读更多关于：PreparedStatement 和 ResultSet