result set type is TYPE_FORWARD_ONLY

connect=dataSource.getConnection();
Statement stmt=connect.createStatement();
ResultSet rs=stmt.executeQuery(strSql);
rs.last（）;                                                                                 (转载）

这样写之后会报rs.last（）有错，后来看到last()方法：

Throws:

SQLException - if a database access error occurs or the result set type is TYPE_FORWARD_ONLY

后来查明原因果然是因为the result set type is TYPE_FORWARD_ONLY，查明的具体过程是：System.out.println(rs.getType());看到打印出来的结果是1003，后到JDK的src里面查到int TYPE_FORWARD_ONLY = 1003;这句话，说明the result set type is TYPE_FORWARD_ONLY。

那么解决办法就是要把the result set type 不要设成 TYPE_FORWARD_ONLY，后来在网上查到解决办法是：

connect=dataSource.getConnection();
Statement stmt=connect.createStatement(ResultSet.TYPE_SCROLL_INSENSITIVE,   
                     ResultSet.CONCUR_UPDATABLE);
ResultSet rs=stmt.executeQuery(strSql);
rs.last（）;