java getString

今天讀到一段從oracle中讀代碼的代碼，忘了getString(1)什么意思了，特意查了一下學習了一下。

這是文檔中的解釋：要注意1就是第一列

String getString(int columnIndex)
                 throws SQLException
Retrieves the value of the designated column in the current row of this ResultSet object as a String in the Java programming language.
Parameters:
columnIndex - the first column is 1, the second is 2, ...
Returns:
the column value; if the value is SQL NULL, the value returned is null
Throws:
SQLException - if the columnIndex is not valid; if a database access error occurs or this method is called on a closed result set

以 Java 編程語言中  String 的形式獲取此  ResultSet 對象的當前行中指定列的值 

參數：

columnIndex - 第一個列是 1，第二個列是 2，……

返回：

列值；如果值為 SQL  NULL，則返回值為  null

拋出：

SQLException - 如果 columnIndex 無效；如果發生數據庫訪問錯誤或在已關閉的結果集上調用此方法

程序片段：

……
   String name,addr;
   Customer cust;

   Connection con = obtainConnection();
   Statement stmt = con.createStatement();
   ResultSet result = stmt.executeQuery(
     "SELECT cust_name, address FROM Customer "
     + "WHERE ssn=" + "'" + id + "'");
   if (result.next()) {
    name = result.getString(1);
    addr = result.getString(2);
    cust = new Customer(id,name,addr);
   } else {
    throw new BrokerException("用戶" + id + "的信息沒找到 :(");
   }
   return cust;