java对数据库操作代码

如何通过Java代码操作数据库

//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

java连接数据库具体操作以及代码！最好有个例子 越详细越好?

你要连接的是什么数据库

package com.dao.conn;

import com.entity.PubTermBean;

/**

* @author Administrator

*

*/

public static Connection getConn(){

Connection conn=null;

try {

Class.forName("com.microsoft.sqlserver.jdbc.SQLServerDriver").newInstance(); //加载驱动类

} catch (InstantiationException e) {

e.printStackTrace();

} catch (IllegalAccessException e) {

} catch (ClassNotFoundException e) {

} catch (SQLException e) {

}

return conn;

//查询数据库表的方法

public ListUs select() {

Connection con = null;

PreparedStatement pst = null;

ResultSet rt = null;

ListUs list = new ArrayListUs();

String sql="select * from users";//查询语句

pst = con.prepareStatement();

rt = pst.executeQuery();//执行查询

while (rt.next()) { //循环查询的结果集

//将数据封装到javabean里

Us u = new Us();

u.setId(rt.getInt(1));

//将每一个javabean对象放到list集合

list.add(u);

} finally {

//关闭数据库操作对象

if (rt != null) {

rt.close();

if (pst != null) {

pst.close();

if (con != null) {

con.close();

return list; //返回得到的数据库数据

通过java代码如何实现对mysql数据库进行创建新的数据库的操作

①. import java.sql.Connection;

①.0 * @param args

①.1 */

求：用Java连接数据库和简单的数据库操作代码

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.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 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();

java连接数据库的代码

用这个类吧.好的话,给我加加分.

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

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 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...");

Class.forName(ConnectionDemo.DRIVER);

conn = DriverManager.getConnection(ConnectionDemo.URL, ConnectionDemo.USER, ConnectionDemo.PASS);

System.out.println("成功连接");

// TODO Auto-generated catch block

public static Statement getStatement(String sql){

System.out.println("执行SQL语句中...");

ps = conn.createStatement(ResultSet.TYPE_SCROLL_SENSITIVE, ResultSet.CONCUR_UPDATABLE);

rs = ps.executeQuery(sql);

System.out.println("执行完查询操作,结果已返回ResultSet集合");

ps.executeUpdate(sql);

System.out.println("已执行完毕删除操作");

System.out.println("已执行完毕增加操作");

}else{

System.out.println("已执行完毕更新操作");

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...");

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

String sql = "delete from type where id = 1";

ConnectionDemo.getStatement(sql);

String sql1 = "select * from type";

ConnectionDemo.getStatement(sql1);

ResultSet rs = ConnectionDemo.getResultSet();

System.out.println("编号 "+"类 型");

System.out.print(" "+rs.getInt(1)+" ");

ConnectionDemo.closeConnection();