标签：
今天读到一段从oracle中读代码的代码，忘了getString(1)什么意思了，特意查了一下学习了一下。
这是文档中的解释：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
String 的形式获取此 ResultSet 对象的当前行中指定列的值 columnIndex - 第一个列是 1，第二个列是 2，……NULL，则返回值为 nullSQLException - 如果 columnIndex 无效；如果发生数据库访问错误或在已关闭的结果集上调用此方法程序片段：
…… 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("用户" + id + "的信息没找到 :("); } return cust;
标签：
原文地址：http://www.cnblogs.com/zhanglala/p/4960118.html
