Java Novice Note 34 connection database

1.JdbcUtil

Package Com.yfs.javase.jdbc;import Java.sql.connection;import Java.sql.drivermanager;import java.sql.ResultSet; Import Java.sql.sqlexception;import Java.sql.statement;public class Jdbcutil {private static final String Driver = "SUN.J Dbc.odbc.JdbcOdbcDriver ";p rivate static final String url =" Jdbc:odbc:driver={microsoft Access driver (*.mdb)};D bq= School.mdb ";//Get connection method public static Connection getconnection () {Connection conn = null;//Connect database try {class.forname (driver) ; conn = drivermanager.getconnection (URL);} catch (ClassNotFoundException e) {System.out.println ("Driver class not found ..."); catch (SQLException e) {System.out.println ("Connection database failed ..."); Return conn;} Release connection public static void release (ResultSet RS, Statement St, Connection conn) {try {if (rs! = null) {Rs.close ();}} catch (SQLException e) {E.printstacktrace ();} Finally {try {if (st! = null) {St.close ()}} catch (SQLException e) {e.printstacktrace ();} finally {try {if (conn! = null) {Conn.close ();}} catch (SQLException e) {e.printstacktrace ();}}}}

2. Connection Information: Jdbc.properties file

# #oracle \u9a71\u52a8jdbc.driver = Oracle.jdbc.OracleDriverjdbc.url = Jdbc:oracle:thin: @YEMA203 -13:1521:yfs_ Dbjdbc.username = Scottjdbc.password = tiger# #SQL Server 2005#jdbc.driver = Com.microsoft.sqlserver.jdbc.sqlserverdriver#jdbc.url = jdbc:sqlserver://localhost:1434;databasename=yfs_db# Jdbc.username = Sa#jdbc.password = # #MySQL #jdbc.driver = Com.mysql.jdbc.driver#jdbc.url = jdbc:mysql://localhost:3306/ Test#jdbc.username = Root#jdbc.password = root# #Access #jdbc.driver = Sun.jdbc.odbc.jdbcodbcdriver#jdbc.url = Jdbc:odbc :d river={microsoft Access Driver (*.mdb)};D Bq=yfs_db.mdb    

3.JDBCDEMO1 test SQL Execution (increase, check, change, delete)

Package Com.yfs.javase.jdbc;import Java.sql.connection;import Java.sql.drivermanager;import java.sql.SQLException; Import Java.sql.statement;public class JdbcDemo1 {public static void main (string[] args) throws Exception {//createtable ( );//insertdata ();//updata ();//deletedata (); Create ();} public static void Create () throws Exception {Connection conn = jdbcutil.getconnection (); Statement st = Conn.createstatement ();//SQL statement executed by string sql = "CREATE TABLE stu (ID int primary key, name Char (), score I NT) ";//execute St.execute (SQL);//close connection jdbcutil.release (null, ST, conn); SYSTEM.OUT.PRINTLN ("Table created successfully ..."); public static void DeleteData () throws Exception {Connection conn = jdbcutil.getconnection (); Statement st = Conn.createstatement ();//Execute SQL statement String sql = "Delete from Stu where id=102";//execute St.execute (SQL);//Close Connection J Dbcutil.release (NULL, ST, conn); System.out.println ("Delete data successfully ...");} public static void Updata () throws Exception {Connection conn = jdbcutil.getconnection (); Statement st = Conn.createstatemeNT ();//Execute SQL statement String sql = "Update stu set score=80 where id=102";//execute St.execute (SQL);//close connection st.close (); Conn.close (); SYSTEM.OUT.PRINTLN ("Update data successfully ...");} public static void InsertData () throws Exception {//Load driver Class.forName ("Sun.jdbc.odbc.JdbcOdbcDriver");//urlstring URL = "Jdbc:odbc:driver={microsoft Access Driver (*.mdb)};D Bq=e:/school.mdb";//Get connection Connection conn = Drivermanager.getconnection (URL);//URL database address//Execution Object Statement st = Conn.createstatement ();//SQL statement executed//string sql = " Insert into Stu (Id,name,score) VALUES (101, ' Mustang ', 98) "; String sql = "INSERT into Stu (Id,name,score) VALUES (102, ' Transformers 4 ', 65)";//execute St.execute (SQL);//close connection st.close (); conn.close (); System.out.println ("Insert data successfully ...");} public static void CreateTable () throws Exception {//Load driver Class.forName ("Sun.jdbc.odbc.JdbcOdbcDriver");//URLString url = "Jdbc:odbc:driver={microsoft Access driver (*.mdb)};D Bq=e:/school.mdb";//Get connection Connection conn = Drivermanager.getconnection (URL);//URL database address//Execution Object Statement st = Conn.createstatement();//Execute SQL statement String sql = "CREATE TABLE stu (ID int primary key, name Char (), score int)";//execute St.execute (SQL);//Close Connection St . Close (); Conn.close (); SYSTEM.OUT.PRINTLN ("Database operation succeeded ...");}}

 4.server3

Package Com.yfs.javase;import Java.io.bufferedoutputstream;import Java.io.bufferedreader;import Java.io.ioexception;import Java.io.inputstream;import Java.io.inputstreamreader;import Java.io.OutputStream; Import Java.io.outputstreamwriter;import java.io.printwriter;import java.net.serversocket;import java.net.Socket; Import Java.util.scanner;public class Server3 {/** * Boot service listener port */public static void Main (string[] args) throws Exception { ServerSocket Server = new ServerSocket (3000);//Start System.out.println ("Server boot, listen 3000 ports ..."); final socket socket = Server.accept ();//monitor If there are other hosts connected to string other = Socket.getinetaddress (). gethostaddress ();  System.out.println (Other + "request connection ...");//Receive information start multithreading new Thread (new Runnable () {@Overridepublic void run () {InputStream in = Null BufferedReader read = Null;while (true) {try {in = Socket.getinputstream (); read = new BufferedReader (New InputStreamReader (in)); String msg = Read.readline (), if (msg! = null) {SYSTEM.OUT.PRINTLN ("client says:" + msg);}} catch (IOException E) {E.printstacktrace ();}}}). Start ();//send information to get output stream outputstream out = Socket.getoutputstream (); Bufferedoutputstream buf = new Bufferedoutputstream (out); PrintWriter pw = new PrintWriter (new OutputStreamWriter (BUF), true);p w.println ("This is information sent by the server ...."); Scanner scan = new Scanner (system.in); String msg = Scan.next (), while (!msg.equals ("Bye")) {pw.println (msg); msg = Scan.next ();} Pw.close (); Buf.close (); Out.close (); SYSTEM.OUT.PRINTLN ("Send Message Complete");}}

 4.client3

Package Com.yfs.javase;import Java.io.bufferedinputstream;import Java.io.bufferedreader;import java.io.IOException ; Import Java.io.inputstream;import Java.io.inputstreamreader;import Java.io.outputstream;import Java.io.outputstreamwriter;import Java.io.printwriter;import Java.net.socket;import Java.util.Scanner;public class Client3 {/** * @param args */public static void main (string[] args) throws Exception {final socket socket = new Socket ("19 2.168.1.30 ", 3000);//Receive Message New Thread (new Runnable () {@Overridepublic void run () {inputstream in = null; BufferedReader Read = null;try {in = Socket.getinputstream (); read = new BufferedReader (new InputStreamReader (in)); String msg = Read.readline (); while (msg! = null) {SYSTEM.OUT.PRINTLN ("server says:" + msg); msg = Read.readline ();}} catch (IOException e) {e.printstacktrace ();}}}). Start ();//send information outputstream out = Socket.getoutputstream (); PrintWriter pw = new PrintWriter (new OutputStreamWriter (out), true); Scanner scan = new Scanner (system.in); String msg = sCan.next (); while (!msg.equals ("Bye")) {pw.println (msg); msg = Scan.next ();} Out.close ();p w.close ();}}

Java Novice Note 34 connection database