Complete primary Universal DAO with Reflection

First, the goal

Complete primary Universal DAO with Reflection

Second, note

1.field[] fi = Clazz.getdeclaredfields ();

for (Field Ff:fi) {
Ff.setaccessible (TRUE);
Ff.set (ob, Rs.getobject (Ff.getname ()));
}

Third, the Code

Package Com.jikexueyuan.util;import Java.lang.reflect.field;import Java.sql.connection;import Java.sql.preparedstatement;import Java.sql.resultset;import Java.util.arraylist;import Com.jikexueyuan.bean.antype;import Com.jikexueyuan.bean.animals;public class Basedao {public ArrayList getList (class CL) {ArrayList ar = new ArrayList (); Connection conn = Baseconnection.getconnection (); PreparedStatement PS = null; ResultSet rs = null; String sql = "SELECT * from" +cl.getsimplename (); Field[] fi = Cl.getdeclaredfields (); try {PS = conn.preparestatement (sql); rs = Ps.executequery (); while (Rs.next ()) { Object ob = Cl.newinstance ();//êµàý»¯àà¶ôïófor (Field ff:fi) {ff.setaccessible (true); Ff.set (ob, Rs.getobject ( Ff.getname ()));} Ar.add (OB);}} catch (Exception e) {e.printstacktrace ();} Finally{baseconnection.closeres (Conn, PS, RS);} return ar;} Public Object Getobbyid (Class cl,int ID) {Object OB = NULL; Connection conn = Baseconnection.getconnection (); PreparedStatement PS = null; ResultSet RS =null; Field[] fi = CL.getdeclaredfields (); String sql = "SELECT * from" +cl.getsimplename () + "where" +fi[0].getname () + "=" +id;try {PS = conn.preparestatement (SQL); r s = Ps.executequery (), while (Rs.next ()) {OB = Cl.newinstance (); for (Field Ff:fi) {ff.setaccessible (true); Ff.set (ob, Rs.getobject (Ff.getname ()));}}} catch (Exception e) {e.printstacktrace ();} Finally{baseconnection.closeres (Conn, PS, RS);} return OB;} Public ArrayList Getlistbysome (Class cl, String name,object value) {ArrayList ar = new ArrayList (); Connection conn = Baseconnection.getconnection (); PreparedStatement PS = null; ResultSet rs = null; Field[] fi = Cl.getdeclaredfields ();  String sql = "SELECT * from" +cl.getsimplename () + "where" +name+ "=" "+value+" ' "; try {PS = conn.preparestatement (sql); rs = Ps.executequery (); while (Rs.next ()) {Object OB = Cl.newinstance (); for (Field Ff:fi) {ff.setaccessible (true); Ff.set (ob, Rs.getobject (Ff.getname ()));} Ar.add (OB);}} catch (Exception e) {e.printstacktrace ();} Finally{baseconnection.closeres (Conn, PS, RS);} Return aR;} public boolean insert (Object ob) {Boolean b = false; Connection conn = Baseconnection.getconnection (); PreparedStatement PS = null; Class cl = Ob.getclass (); Field[] fi = Cl.getdeclaredfields ();//insert into Animals (Name,age,anid) VALUES (?,?,?)  String sql = "INSERT INTO" +cl.getsimplename () + "("; for (int i = 1;i<fi.length;i++) {sql = Sql+fi[i].getname ();//4 0 1 2 3if (i!=fi.length-1) {sql = sql+ ",";}} sql = sql+ ") values ("; for (int i = 1;i<fi.length;i++) {sql = sql+ "?) "; if (i!=fi.length-1) {sql = sql+", ";}} sql = sql+ ")"; try {PS = conn.preparestatement (sql); for (int i = 1;i<fi.length;i++) {fi[i].setaccessible (true); Ps.setobject (i, Fi[i].get (OB));} int a = Ps.executeupdate (); if (a>0) {b = true;}} catch (Exception e) {e.printstacktrace ();} Finally{baseconnection.closeres (conn, PS);} return b;} public boolean insert1 (Object ob) {Boolean b = false; Connection conn = Baseconnection.getconnection (); PreparedStatement PS = null; Class cl = Ob.getclass (); Field[] fi = Cl.getdeclaredfields (); StringbuFfer sb = new StringBuffer ();//insert into Animals (Name,age,anid) VALUES (?,?,?) Sb.append ("INSERT INTO"), Sb.append (Cl.getsimplename ()), Sb.append ("("); for (int i = 1;i<fi.length;i++) {sb.append ( Fi[i].getname ()); if (i!=fi.length-1) {sb.append (",");}} Sb.append (") VALUES ("); for (int i = 1;i<fi.length;i++) {sb.append ("?"); if (i!=fi.length-1) {sb.append (",");}} Sb.append (")"), try {PS = conn.preparestatement (sb.tostring ()); for (int i = 1;i<fi.length;i++) {fi[i].setaccessible ( true);p S.setobject (i, Fi[i].get (OB));} int a = Ps.executeupdate (); if (a>0) {b = true;}} catch (Exception e) {e.printstacktrace ();} Finally{baseconnection.closeres (conn, PS);} return b;} public boolean update (Object ob) {Boolean b = false; Connection conn = Baseconnection.getconnection (); PreparedStatement PS = null; Class cl = Ob.getclass (); Field[] fi = Cl.getdeclaredfields (); StringBuffer sb = new StringBuffer ();//update animals Set name =?, age =?, Anid =? WHERE id =? sb.append ("Update"); Sb.append (Cl.getsimplename ()); Sb.append ("Set"), for (int i = 1;i<fi.length;i++) {fi[i].setaccessible (true); Sb.append (Fi[i].getname ()); Sb.append ("=?"); if (i!=fi.length-1) {sb.append (",");}} Sb.append ("where"); Sb.append (Fi[0].getname ()); Sb.append ("=?"); try {PS = conn.preparestatement (sb.tostring ()); for (int i = 1;i<fi.length;i++) {fi[i].setaccessible (true); Ps.setobject (i, Fi[i].get (OB));} Fi[0].setaccessible (True);p S.setobject (Fi.length, Fi[0].get (OB)), int a = Ps.executeupdate (), if (a>0) {b = true;}} catch (Exception e) {e.printstacktrace ();} Finally{baseconnection.closeres (conn, PS);} return b;} public boolean Delete (Class cl, int id) {Boolean b = false; Connection conn = Baseconnection.getconnection (); PreparedStatement PS = null; Field[] fi = Cl.getdeclaredfields (); String sql = "Delete from" +cl.getsimplename () + "where" +fi[0].getname () + "=?"; try {PS = conn.preparestatement (sql);p S.setobject (1, id), int a = Ps.executeupdate (), if (a>0) {b = true;}} catch (Excepti On e) {e.printstacktrace ();} Finally{baseconnectioN.closeres (conn, PS);} return b;} public boolean deletebysome (Class cl, String Name,object value) {Boolean b = false; Connection conn = Baseconnection.getconnection (); PreparedStatement PS = null; Field[] fi = Cl.getdeclaredfields (); String sql = "Delete from" +cl.getsimplename () + "where" +name+ "=?"; try {PS = conn.preparestatement (sql);p S.setobject (1, value), int a = Ps.executeupdate (), if (a>0) {b = true;}} catch (Exce Ption e) {e.printstacktrace ();} Finally{baseconnection.closeres (conn, PS);} return b;} public static void Main (string[] args) {Basedao bd = new Basedao (),//animals an = new Animals ();//an.setname ("½ð¾ååö");//a N.setage (//an.setanid) (1);//an.setid (3);//boolean B = bd.update (an); Bd.deletebysome (Animals.class, "name", " ½ð¾ååö ");//bd.delete (Animals.class, 5);//arraylist<animals> ar = bd.getlist (animals.class);//for (Animals an: AR) {//system.out.println ("±àºå£º" +an.getid () + "ãûxö£º" +an.getname () + "Äêáä:" +an.getage ());//}//arraylist< antype> arr = bd.getlist (Antype.class);for (Antype An:arr) {//system.out.println ("±àºå£º" +an.getanid () + "ãûxö£º" +an.getanname ()),//}//animals an = ( Animals) Bd.getobbyid (Animals.class, 2);//system.out.println (An.getname ());//arraylist<animals> AR = Bd.getlistbysome (Animals.class, "age", "a"),//for (Animals an:ar) {//system.out.println ("±àºå£º" +an.getid () + "ãûxö£ º "+an.getname () +" Äêáä: "+an.getage ())//}}}

Source code: http://files.cnblogs.com/files/shamgod/Java-DAO-4-v2.7z

Transfer from Jikexueyuan

Complete primary Universal DAO with Reflection