java - SQL语句语法错误时ResultSet的值？

Question

我正在使用 mySQL。正如您所看到的，SELECT 处的 SQL 语句是错误的。那么，我想知道 rs 的值是多少？ 我希望得到一些建议。非常感谢您；

String sql = "SELCT * FROM user WHERE username = '" + username + "' and password = '" + password + "'";
ResultSet rs = stm.executeQuery(sql); 

Answer 1

没有任何值(value)，因为 Statement.executeQuery(String)会抛出 SQLException 。正如链接的 Javadoc 所说，

Returns: a ResultSet object that contains the data produced by the given query; never null

Throws: SQLException - if a database access error occurs, this method is called on a closed Statement, the given SQL statement produces anything other than a single ResultSet object, the method is called on a PreparedStatement or CallableStatement