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public boolean checkLogin(String username,String password){
String sql="select * from user" + "where username='"+username +"' and password ='"+password"';
List<UserInfo> list =userdao.query(sql);
return list.size()>0 ? true:false;
}
public List query(String sql)
{
String[] columns={"username","password","email"};
return query(sql,columns);
}
protect List query(String sql,String[] columns){
List list=new ArrayList();
Map map=null;
openconnection();
try{
ps=conn.prepareStatement(sql);
rs=ps.executeQuery();
while(rs,next()){
map=new HashMap();
for(int i=0;i<columns.length;i++)
{
map.put(colomns[i],rs.getObject(columns[i]));
}
list.add(map);
}
}catch(SQLException e)......