多条件查询

public static  List<Grade>list(List<Object>m,    List<Object>n ,String b)
        { 
            String sql="select * from test20191117 where 1 = 1 ";
            //select语句
            //select * from tabel_name   这是查询所有，若要查询某一列
            //select column1_name,column2_name,column3_name from table_name
            StringBuilder c=new StringBuilder(sql);
            if(b.equals("binglie"))
            {    String d=" = ";
            for(int i=0;i<m.size();i++)
            {
                if(new String((String) m.toArray()[i]).contains("type"))
                {
                c.append("and "+n.toArray()[i]);
                }
                
                if(new String((String) m.toArray()[i]).contains("cipin"))
                        {
                if(new String((String) n.toArray()[i]).contains("jingque"))
                {    
                    
                
                    d=" = ";
                    
                    c.append(d);    
                }
                else
                {
                    d=" like ";
                    c.append(d);
                }
                
                        
                        }
                if(new String((String) m.toArray()[i]).contains("search"))
                {
                    if(d.equals(" like "))
                    {
                        c.append("‘%"+n.toArray()[i]+"%‘ ");
                    }
                
                    else {
                        c.append(" ‘"+n.toArray()[i]+"‘ ");

                    }
                
                }
            }}
            else if(b.equals("huozhe"))
            {c.append(" and ");
            String d=" = ";
                for(int i=0;i<m.size();i++)
            {
                    if(new String((String) m.toArray()[i]).contains("type"))
                    {    c.append(n.toArray()[i]);}
                    
                    
                    if(new String((String) m.toArray()[i]).contains("cipin"))
                            {
                    if(new String((String) n.toArray()[i]).contains("jingque"))
                    {    d=" = ";
                        c.append(d);    
                    }
                    else
                    {
                        d=" like ";
                        c.append(d);
                    }
                    
                            
                            }
                
                
                    
                
                if(new String((String) m.toArray()[i]).contains("search"))
                {
                    if(d.equals(" like "))
                    {
                        c.append("‘%"+n.toArray()[i]+"%‘ ");

                    }
                    else
                    {
                                    c.append("‘"+n.toArray()[i]+"‘ ");

                    }
                }

                if(new String((String) m.toArray()[i]).contains("xuanze"))    
        {
                    if(new String((String) n.toArray()[i]).contains("binglie"))
                    {System.out.println(i);
            c.append(" and ");}
        else
            {
            c.append(" or ");}
            }

            }
                
            }
            else {
                
            String d=" = ";
                for(int i=0;i<m.size();i++)
                {
                    if(new String((String) m.toArray()[i]).contains("type"))
                    {
                    c.append("and "+n.toArray()[i]+d);
                    }
                    if(new String((String) m.toArray()[i]).contains("search"))
                    {
                    c.append("‘"+n.toArray()[i]+"‘ ");
                    }
                    if(new String((String) n.toArray()[i]).contains("buhan"))
                    {
                        d=" != ";
                    }
                    System.out.println(b);
                }
                
                
            }
            System.out.println(b);
            sql=c.toString();
                        System.out.println(sql);
            List<Grade>list=new ArrayList<>();
            //给集合list创造（new）一个存储空间用于存放数据
            
            Connection conn=DBUtil.getConn();
            Statement state=null;
            ResultSet rs=null;
            
            try
            {
                state=conn.createStatement();
                rs=state.executeQuery(sql);
                Grade grade=null;
                while(rs.next()) //这里表示，当rs.next()有值得时候，即收到查询结果
                {
                    String name=rs.getString("name");
                    String sex=rs.getString("sex");
                    String nature=rs.getString("nature");
                    String time=rs.getString("time");
                    String old=rs.getString("old");
                    String select=rs.getString("zhengzhi");
                    String checkbox1=rs.getString("checkbox1");
                    String checkbox2=rs.getString("checkbox2");
                    String checkbox3=rs.getString("checkbox3");
                    String checkbox4=rs.getString("checkbox4");
                     grade=new Grade(name,sex,nature,time,old,select,checkbox1,checkbox2,checkbox3,checkbox4);
                    list.add(grade); //表示，把bean里的数据存入到list当中
                }
                
            }
            
            catch (SQLException e)
            {
                e.printStackTrace();
            }
            
            finally
            {
                DBUtil.close(state, conn);
            }
            return list;
        }