回复：我的java自学之路

厉害，我现在正在学习java编程，不知道自己要向那里有，看完之后头脑清晰多了，谢谢楼主

很好

路过

数据库连不上 救命啊
package com.dao;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
public class DB
{
private Connection con;
private PreparedStatement pstm;
private String user = "sa";
private String password = "sa";
private String className = "com.microsoft.jdbc.sqlserver.SQLServerDriver";
private String url = "jdbc:microsoft:sqlserver://localhost:1433;databaseName=db_rlcp";
public DB()
{
try
{
Class.forName(className);
} catch (ClassNotFoundException e)
{
System.out.println("������ݿ���ʧ�ܣ�");
e.printStackTrace();
}
}
/** ������ݿ����� */
public Connection getCon()
{
try
{
con = DriverManager.getConnection(url, user, password);
} catch (SQLException e)
{
System.out.println("������ݿ�����ʧ�ܣ�");
con = null;
e.printStackTrace();
}
return con;
}
public void doPstm(String sql, Object[] params)
{
if (sql != null && !sql.equals(""))
{
if (params == null)
params = new Object[0];
getCon();
if (con != null)
{
try
{
System.out.println(sql);
pstm = con.prepareStatement(sql,
ResultSet.TYPE_SCROLL_INSENSITIVE,
ResultSet.CONCUR_READ_ONLY);
for (int i = 0; i < params.length; i++)
{
pstm.setObject(i + 1, params[i]);
}
pstm.execute();
} catch (SQLException e)
{
System.out.println("doPstm()�������?");
e.printStackTrace();
}
}
}
}
public ResultSet getRs() throws SQLException
{
return pstm.getResultSet();
}
public int getCount() throws SQLException
{
return pstm.getUpdateCount();
}
public void closed()
{
try
{
if (pstm != null)
pstm.close();
} catch (SQLException e)
{
System.out.println("�ر�pstm����ʧ�ܣ�");
e.printStackTrace();
}
try
{
if (con != null)
{
con.close();
}
} catch (SQLException e)
{
System.out.println("�ر�con����ʧ�ܣ�");
e.printStackTrace();
}
}
}