用这个类吧.好的话,给我加加分.
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import java.sql.*;
/**
* @功能: 一个JDBC的本地化API连接类,封装了数据操作方法,只用传一个SQL语句即可
* @作者: 李开欢
* @日期: 2007/
*/
public class ConnectionDemo {
/*
* 这里可以将常量全部放入另一个类中,以方便修改
*/
private static Connection conn;
private static Statement ps;
private static ResultSet rs;
private static final String DRIVER = "com.microsoft.jdbc.sqlserver.SQLServerDriver";
private static final String URL = "jdbc:microsoft:sqlserver://localhost:1433;DatabaseName=mydb";
private static final String USER ="sa";
private static final String PASS = "sa";
public ConnectionDemo() {
// TODO Auto-generated constructor stub
ConnectionDemo.getConnection();
}
public static Connection getConnection(){
System.out.println("连接中...");
try {
Class.forName(ConnectionDemo.DRIVER);
conn = DriverManager.getConnection(ConnectionDemo.URL, ConnectionDemo.USER, ConnectionDemo.PASS);
System.out.println("成功连接");
} catch (ClassNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return conn;
}
public static Statement getStatement(String sql){
System.out.println("执行SQL语句中...");
try {
ps = conn.createStatement(ResultSet.TYPE_SCROLL_SENSITIVE, ResultSet.CONCUR_UPDATABLE);
if(sql.substring(0, 6).equals("select")){
rs = ps.executeQuery(sql);
System.out.println("执行完查询操作,结果已返回ResultSet集合");
}else if(sql.substring(0, 6).equals("delete")){
ps.executeUpdate(sql);
System.out.println("已执行完毕删除操作");
}else if(sql.substring(0, 6).equals("insert")){
ps.executeUpdate(sql);
System.out.println("已执行完毕增加操作");
}else{
ps.executeUpdate(sql);
System.out.println("已执行完毕更新操作");
}
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return ps;
}
public static ResultSet getResultSet(){
System.out.println("查询结果为:");
return rs;
}
public static void closeConnection(){
System.out.println("关闭连接中...");
try {
if (rs != null) {
rs.close();
System.out.println("已关闭ResultSet");
}
if (ps != null) {
ps.close();
System.out.println("已关闭Statement");
}
if (conn != null) {
conn.close();
System.out.println("已关闭Connection");
}
} catch (Exception e) {
// TODO: handle exception
}
}
public static void main(String[] args) {
// TODO Auto-generated method stub
ConnectionDemo.getConnection();
String sql = "delete from type where id = 1";
ConnectionDemo.getStatement(sql);
String sql2 = "insert into type values(1,'教学设备')";
ConnectionDemo.getStatement(sql2);
String sql1 = "select * from type";
ConnectionDemo.getStatement(sql1);
ResultSet rs = ConnectionDemo.getResultSet();
System.out.println("编号 "+"类 型");
try {
while(rs.next()){
System.out.print(" "+rs.getInt(1)+" ");
System.out.println(rs.getString(2));
}
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
ConnectionDemo.closeConnection();
}
}
//此类为连接数据库并进行数据库的操作
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
public class Conn {
private static Connection conn = null;
private static Statement st = null;
private static ResultSet rs = null;
//建立数据库的连接
以上的代码都不如哥的 且看哥是怎么写条理清晰的代码的!!!
package dbconnection //java 中不存在没有包的类(讲解详细因为项目需要)
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;
import java.sql.Statement;//引入sql数据库包
public class DBConnection{
private Connection conn=null;
private Statement stmt=null;
private Result rs=null;
private String jdbc="com.microsoft.sqlserver.jdbc.SQLServerDriver";
private String driverManager="jdbc:sqlserver://localhost:1433;databasename=HcitPos";
private String user="admin";
private int password="admin";
public DBConnection{
try{
Class.forName("jdbc");
conn.getConnection("driverManager");
}
catch(Exception e){}
}
public selectMethod(String sql){
stmt=conn.createStatement();
rs=stmt.extcuteQuery("sql");
while(rs.next()){
String title=rs.getString("title");//利用javaBean获得数据库中的属性
String name=rs.getString("name");
.......
System.out.println("title");
System.out.println("name");
......
//当然数据库的操作有很多 这里简单介绍下功能的实现
}
}
public void closeDB(){
if(rs != null) rs.close();
if(stmt != null) stmt.close();
if(conn != null) conn.close();
}
}
1 将数据库的JDBC驱动加载到classpath中,在基于JAVAEE的WEB应用实际开发过程中,通常要把目标数据库产品的JDBC驱动复制到WEB-INF/lib下.
2 加载JDBC驱动,并将其注册到DriverManager中,下面是一些主流数据库的JDBC驱动加裁注册的代码:
//Oracle8/8i/9iO数据库(thin模式)
Class.forName("oracle.jdbc.driver.OracleDriver").newInstance();
//Sql Server7.0/2000数据库
Class.forName("com.microsoft.jdbc.sqlserver.SQLServerDriver").newInstance();
//DB2数据库
Class.froName("com.ibm.db2.jdbc.app.DB2Driver").newInstance();
//Informix数据库
Class.forName("com.informix.jdbc.IfxDriver").newInstance();
//Sybase数据库
Class.forName("com.sybase.jdbc.SybDriver").newInstance();
//MySQL数据库
Class.forName("com.mysql.jdbc.Driver").newInstance();
//PostgreSQL数据库
Class.forNaem("org.postgresql.Driver").newInstance();
3 建立数据库连接,取得Connection对象.例如:
//Oracle8/8i/9i数据库(thin模式)
String url="jdbc:oracle:thin:@localhost:1521:orcl";
String user="scott";
String password="tiger";
Connection conn=DriverManager.getConnection(url,user,password);
--完整的太多了!我已经把完整的代码发到你QQ邮箱了!