java新手笔记34 连接数据库

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.jdbc.odbc.JdbcOdbcDriver";
private static final String url = "jdbc:odbc:driver={Microsoft Access Driver (*.mdb)};DBQ=school.mdb";

// 获取连接方法
public static Connection getConnection() {
Connection conn = null;
// 连接数据库
try {
Class.forName(driver);
conn = DriverManager.getConnection(url);
} catch (ClassNotFoundException e) {
System.out.println("驱动类找不到...");
} catch (SQLException e) {
System.out.println("连接数据库失败...");
}
return conn;
}

// 释放连接
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();
}
}
}
}

}

##oracle\u9A71\u52A8
jdbc.driver = oracle.jdbc.OracleDriver
jdbc.url = jdbc:oracle:thin:@YEMA203-13:1521:YFS_DB
jdbc.username = scott
jdbc.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:driver={Microsoft Access Driver (*.mdb)};DBQ=YFS_DB.mdb    "... DBQ="+application.getRealPath("/Data/ReportDemo.mdb")
#jdbc.username =
#jdbc.password =

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();
// 执行的sql语句
String sql = "create table stu(id int primary key, name char(30), score int)";
// 执行
st.execute(sql);
// 关闭连接
JdbcUtil.release(null, st, conn);
System.out.println("表创建成功...");

}

public static void deleteData() throws Exception {
Connection conn = JdbcUtil.getConnection();
Statement st = conn.createStatement();
// 执行的sql语句
String sql = "delete from stu where id=102";
// 执行
st.execute(sql);
// 关闭连接
JdbcUtil.release(null, st, conn);
System.out.println("删除数据成功...");

}

public static void upData() throws Exception {
Connection conn = JdbcUtil.getConnection();
Statement st = conn.createStatement();
// 执行的sql语句
String sql = "update stu set score=80 where id=102";
// 执行
st.execute(sql);
// 关闭连接
st.close();
conn.close();
System.out.println("更新数据成功...");

}

public static void insertData() throws Exception {
// 加载驱动
Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
// url
String url = "jdbc:odbc:driver={Microsoft Access Driver (*.mdb)};DBQ=E:/school.mdb";
// 获取连接
Connection conn = DriverManager.getConnection(url);// url 数据库地址
// 执行对象
Statement st = conn.createStatement();
// 执行的sql语句
//String sql = "insert into stu(id,name,score) values(101,'野马',98)";
String sql = "insert into stu(id,name,score) values(102,'变形金刚4',65)";
// 执行
st.execute(sql);
// 关闭连接
st.close();
conn.close();
System.out.println("插入数据成功...");

}

public static void createTable() throws Exception {
// 加载驱动
Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
// url
String url = "jdbc:odbc:driver={Microsoft Access Driver (*.mdb)};DBQ=E:/school.mdb";
// 获取连接
Connection conn = DriverManager.getConnection(url);// url 数据库地址
// 执行对象
Statement st = conn.createStatement();
// 执行的sql语句
String sql = "create table stu(id int primary key, name char(30), score int)";
// 执行
st.execute(sql);
// 关闭连接
st.close();
conn.close();
System.out.println("数据库操作成功...");
}

}

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 {

/**
* 启动服务 监听端口
*/
public static void main(String[] args) throws Exception {
ServerSocket server = new ServerSocket(3000);
// 启动
System.out.println("服务器启动，监听3000端口...");
final Socket socket = server.accept();// 监听是否有其他主机连接
String other = socket.getInetAddress().getHostAddress();
System.out.println(other + "请求连接...");
// 接收信息 启动多线程
new Thread(new Runnable() {
@Override
public 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("客户端说 ： " + msg);
}
} catch (IOException e) {
e.printStackTrace();
}
}
}
}).start();

// 发送信息 获取输出流
OutputStream out = socket.getOutputStream();
BufferedOutputStream buf = new BufferedOutputStream(out);
PrintWriter pw = new PrintWriter(new OutputStreamWriter(buf),true);
pw.println("这是服务器发送的信息....");
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("信息发送完成");

}

}

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("192.168.1.30", 3000);
// 接收信息
new Thread(new Runnable() {
@Override
public 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("服务器说：" + msg);
msg = read.readLine();
}
} catch (IOException e) {
e.printStackTrace();
}
}
}).start();

// 发送信息
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();
pw.close();

}

}