怎样判断判断ResultSet是否为空

pstm = conn.prepareStatement("select * From Cl_ArticleClass Where ParentID=? order by OrderID");

pstm.setInt(1,parentid);

rs = pstm.executeQuery();

if(rs.next()){

coll= new ArrayList<ArticleClassInfo>();

while(rs.next())

{

ArticleClassInfo ac = new ArticleClassInfo();

ac.setClassID(rs.getInt("ClassID"));

ac.setParentPath(rs.getString("ParentPath"));

ac.setClassName(rs.getString("ClassName"));

ac.setChild(rs.getInt("Child"));

ac.setNextID(rs.getInt("NextID"));

ac.setDepth(rs.getInt("Depth"));

coll.add(ac);

}

}

使用rs.next()是否为true来判断，会使游标前移一位，可能丢掉一条记录

if(rs.next()) {

rs.first();

}这样是不是可以重新回到原始位置

改下算法就可以了 太大意了最终结果

pstm = conn.prepareStatement("select * From Cl_ArticleClass Where ParentID=? order by OrderID");

pstm.setInt(1,parentid);

rs = pstm.executeQuery();

if(rs.next()){

coll= new ArrayList<ArticleClassInfo>();

do{

ArticleClassInfo ac = new ArticleClassInfo();

ac.setClassID(rs.getInt("ClassID"));

ac.setParentPath(rs.getString("ParentPath"));

ac.setClassName(rs.getString("ClassName"));

ac.setChild(rs.getInt("Child"));

ac.setNextID(rs.getInt("NextID"));

ac.setDepth(rs.getInt("Depth"));

coll.add(ac);

} while(rs.next());

}

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