Java JDBC：如何通過執行SQL查詢來獲取表的int大小

Question

我的部分代碼如下所示：

int size = 0;

        try {

            String query = "SELECT count(*) FROM users";

            statement = connection.prepareStatement(query);
            statement.execute(query);

我不知道該怎么做才能將表的大小設置為我的int大小。

Answer 1

結果集將包含行數的值。 將值放入您的size變量中。

  ResultSet result = statement.executeQuery(query);
  while (result.next()){
  size= result.getInt(1);
  }
  System.out.println("Number of row:"+size);

Answer 2

int size = 0;

    try {

        String query = "SELECT count(*) FROM users";

        statement = connection.prepareStatement(query);
        ResultSet rs = statement.execute(query);
        size = rs.getInt(1);

rs.getInt（1）將以int形式返回查詢的第一行