最近项目的 core逻辑核心程序

这次的设计也算是失败了百分之40的，不过拿来练手也确实是学到了很多东西，学会了解决问题的很多不通的方法，整个系统是一个子集而已，还需要很多完善，而且想做一个高仿的，看来还是需要继续改进，最近又要忙了，自己给自己打气，晓儿，你加油哦！

 

package com.youngershen.mrp; import java.util.*; import java.sql.*; //°ÑžÃÀàÉèÖóɵ¥ÀûÀ࣬ÌṩÕûžö³ÌÐòµÄºËÐÄÂߌ­œá¹¹ public class MrpCore{ private ArrayList<Student> loadFromDB = new ArrayList<Student>(); private String username = "root"; private String password = "leon94941"; private String host = "jdbc:mysql://127.0.0.1:3306/school"; //Connection conn = null; // Statement state = null ; // ResultSet rs = null; //ListIterator<Student> indexItem = loadFromDB.listIterator(); private ListIterator<Student> indexItem; //ÓÃÓÚË÷ÒýÈ«ŸÖµÄÊýŸÝËùÔÚµÄλÖà private static MrpCore instance = null ; public static MrpCore getInstance(){ if(instance == null) instance = new MrpCore(); return instance; } public void writeToDB(){ ResultSet result = null; try{ Connection conn = DriverManager.getConnection(host,username,password); Statement state = conn.createStatement(); //ÖŽÐвÙ×÷µÄsqlÓïŸä String sql = "delete from student"; state.execute(sql); Iterator<Student> it = loadFromDB.iterator(); while(it.hasNext()){ state.clearBatch();//Çå¿Õµ±Ç°µÄÃüÁîÁÐ±í£» Student temp = it.next(); String name = temp.getName(); String age = temp.getAge(); String sex = temp.getSex(); String id = temp.getID(); String cla = temp.getClasss(); String grade = temp.getGrade(); String location = temp.getLocation(); sql ="insert into student values"+"("+"/""+id+"/""+","+"/""+name+"/""+","+"/""+sex+"/""+","+"/""+age+"/""+","+"/""+grade+"/""+","+"/""+cla+"/""+","+"/""+location+"/""+")"+";"; state.execute(sql); System.out.println(sql); } } catch(SQLException e){ System.out.println("fuck"); e.printStackTrace(); }catch(Exception e){ System.out.println("you"); e.printStackTrace(); } } public void updateToDB(int id,String name,String age,String sex,String grade,String cla,String location){ try{ // UPDATE ±íÃû SET ×Ö¶ÎÃû1=¡¯a',×Ö¶ÎÃû2=¡¯b¡¯ WHERE ×Ö¶ÎÃû3=¡¯c'; Connection conn = DriverManager.getConnection(host,username,password); Statement state = conn.createStatement(); //ÖŽÐвÙ×÷µÄsqlÓïŸä String sql = "update student set name="+"/'"+name+"/'"+","+"age="+"/'"+age+"/'"+","+"sex="+"/'"+sex+"/'"+","+"grade="+"/'"+grade+"/'"+","+"class="+"/'"+cla+"/'"+","+"location="+"/'"+location+"/'"+"where id="+"/'"+id+"/'"+";"; System.out.println(sql); state.execute(sql); } catch(SQLException e){ System.out.println("fuck"); e.printStackTrace(); }catch(Exception e){ System.out.println("you"); e.printStackTrace(); } } public Student showStudentItem(int flag){ if(flag>0){ // indexItem.remove(); return indexItem.next(); } else { //indexItem.remove(); return indexItem.previous(); } } /* public Student showStudentItemReplaceMethod(int index){ // if(loadFromDB.size()) } */ public void loadStudentFromDB(){ //Çå¿ÕŒ¯ºÏÀàÖеÄËùÓÐÊýŸÝ£¬ÒÔ±ãÖØÐÂŽÓÊýŸÝ¿âÖжÁÈ¡È«²¿ÊýŸÝ ResultSet result = null; loadFromDB.clear(); try{ Connection conn = DriverManager.getConnection(host,username,password); Statement state = conn.createStatement(); //ÖŽÐвÙ×÷µÄsqlÓïŸä String sql = "select * from student"; result = state.executeQuery(sql); //¿éœáÊø // result.first(); } catch(SQLException e){ System.out.println("fuck"); e.printStackTrace(); }catch(Exception e){ System.out.println("you"); e.printStackTrace(); } //String name = null; try{ while(result.next()){ String name = null; String age = null; String id = null; String sex = null; String cla = null; String grade = null; String location = null; // String id = null; name = result.getString("name"); name = new String(name.getBytes("ISO-8859-1"),"GB2312"); //id= result.getString("id"); // id = new String(id.getBytes("ISO-8859-1"),"GB2312"); //age = result.getInt("age"); age = new String(name.getBytes("ISO-8859-1"),"GB2312"); age = new String(age.getBytes("ISO-8859-1"),"GB2312"); id = result.getString("id"); id = new String(id.getBytes("ISO-8859-1"),"GB2312"); sex = result.getString("sex"); sex = new String(sex.getBytes("ISO-8859-1"),"GB2312"); cla = result.getString("class"); cla = new String(cla.getBytes("ISO-8859-1"),"GB2312"); grade = result.getString("grade"); grade = new String(grade.getBytes("ISO-8859-1"),"GB2312"); location = result.getString("location"); location = new String(location.getBytes("ISO-8859-1"),"GB2312"); //System.out.println(result.getString("id")+"/t"+name); //ŒÓÈëÄÚŽæµÄŒ¯ºÏœá¹¹ÖÐ Student temp = new Student(id,name,age,sex,location,cla,grade); // temp.showMeEveryThing(); //System.out.println(temp.toString()); loadFromDB.add(temp); // System.out.println("size is"+loadFromDB.size()); } }catch(SQLException e){ System.out.println("love"); e.printStackTrace(); } catch(Exception e){ System.out.println("hate"); e.printStackTrace(); } //rs.close(); // conn.close(); } private static void getConnected(){ String driver = "com.mysql.jdbc.Driver"; // URLÖžÏòÒª·ÃÎʵÄÊýŸÝ¿âÃûschool String url = "jdbc:mysql://127.0.0.1:3306/school"; // MySQLÅäÖÃʱµÄÓû§Ãû String user = "root"; // MySQLÅäÖÃʱµÄÃÜÂë String password = "leon94941"; try { // ŒÓÔØÇý¶¯³ÌÐò Class.forName(driver); // Á¬ÐøÊýŸÝ¿â Connection conn = DriverManager.getConnection(url, user, password); if(!conn.isClosed()) System.out.println("Succeeded connecting to the Database!"); } catch(ClassNotFoundException e) { System.out.println("Sorry,can`t find the Driver!"); e.printStackTrace(); } catch(SQLException e) { e.printStackTrace(); } catch(Exception e) { e.printStackTrace(); } } public ArrayList<Student> getStudentData(){ return loadFromDB; } public void addStudent(Student s){ loadFromDB.add(s); } public void flashIterator(){ indexItem.remove(); } private MrpCore(){ System.out.println("s"); getConnected(); loadStudentFromDB(); indexItem = loadFromDB.listIterator(); System.out.println(loadFromDB.size()); } public static void main(String[] args){ MrpCore mc = MrpCore.getInstance(); System.out.println(mc.getStudentData().size()); // System.out.println(mc.showStudentItem(-1)); mc.writeToDB(); } }