jdbc连接数据库的代码问题jdbc连接mysql数据库

Posted 2023-03-28

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();

参考技术B 连接mysql的完整代码如下：

String dbURL = "jdbc:mysql://localhost:3306/test?characterEncoding=utf8";
String username = "root";
String password = "";
try
Class.forName("com.mysql.jdbc.Driver");
catch(ClassNotFoundException e)

try
conn = DriverManager.getConnection(dbURL, username, password);
String sql = "INSERT INTO goods VALUES (?, ?, ?, ?, ?)";
pstmt = conn.prepareStatement(sql);
pstmt.setString(1, "0001");
pstmt.setString(2, "苹果手机");
pstmt.setString(3, "电子类");
pstmt.setInt(4, 6800);
pstmt.setString(3, "李某某");
pstmt.executeUpdate();
catch (SQLException ex)
ex.printStackTrace();