java连接数据库的代码

Posted 2023-04-04

参考技术A 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
* @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();

求用jdbc 连接数据库的java代码（只连接部分即可）

mysql数据库！！

public Connection getConnection()//事先导入驱动
try
Class.forname("sun.jdbc.odbc.jdbcodbcDriver");//加载驱动
System.out.println("驱动加载完毕");
catch(ClassNotFoundException e)
e.printStackTrace();

try
Connecion con=DriverManager.getConnecion("jdbc:odbc:数据库名成","用户名","密码");//创建连接对象,即已经连接到数据库
system.out.println("连接成功!");

catch(exception e)
e.printStackTrace();

参考技术A public static Connection getConnection()
try
Class.forName("com.mysql.jdbc.Driver");
Connection conn = DriverManager.getConnection("jdbc:mysql://localhost:3306/test", "root", "root");
return conn;
catch (Exception e)
e.printStackTrace();
return null;

本回答被提问者采纳 参考技术B String driverName = "oracle.jdbc.driver.OracleDriver";

String url = "jdbc:oracle:thin:@localhost:1521:ORACLE9I";

Class.forName(driverName);

Connection con = null;

con = DriverManager.getConnection(url,"shown","dbwork"); 参考技术C oracle数据库
oracle.jdbc.driver.OracleDriver
jdbc:oracle:thin:@127.0.0.1:1521:orcl