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weixin_47526498
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5 年前
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public Boolean validateLogin(String user, String password) {
Boolean count = false;
String sql = "select Id from student where Id = '" + password + "'";
SQLcontent S = new SQLcontent();
Statement sc = null;
try {
sc = S.sqlcontent().createStatement();
} catch (SQLException throwables) {
throwables.printStackTrace();
} catch (ClassNotFoundException e) {
e.printStackTrace();
}
ResultSet rs = null;
try {
rs = sc.executeQuery(sql);
if (rs.next())
count = true;
} catch (SQLException throwables) {
throwables.printStackTrace();
}
return count;
}

为什么返回值一直是空null啊....
程序员写BUG的日常
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public Boolean validateLogin(String user, String password) { Boolean count = false; String sql = "select Id from student where Id = '" + password + "'"; SQLcontent S = new SQLcontent(); Statement sc = null; try { sc = S.sqlcontent().createStatement(); } catch (SQLException throwables) { throwables.printStackTrace(); } catch (ClassNotFoundException e) { e.printStackTrace(); } ResultSet rs = null; try { rs = sc.executeQuery(sql); if (rs.next()) count = true; } catch (SQLException throwables) { throwables.printStackTrace(); } return count; }上边代码，最后返回的count为什么一直是null......，救救孩子。