Java教程 Java API 模拟器学习

package zmsjdbc;
import java.sql.*;
public class mysql1
{

private String url="jdbc:mysql://localhost:3306/beyond";
//先下载MYSQL 驱动 mm.mysql-2.0.4-bin.jar 放在D:\JBuilder9\jdk1.4\jre\lib\ext 下

private String user="root";
private String pwd="";
public Connection getcon()
{
Connection con;
try
{ //加载驱动程序
Class.forName("org.gjt.mm.mysql.Driver").newInstance();
//创建连接
con=DriverManager.getConnection(url,user,pwd);
return con;
}

catch(ClassNotFoundException e)
{
System.out.println("加载驱动程序出错");
}

catch(Exception e)
{
System.out.println("出现了好大的错误");
}

return null;
}
public ResultSet executeSql(String sqlstr)
{
Connection conn;
Statement stmt;

try
{
conn=getcon();
stmt=conn.createStatement();
ResultSet rs=stmt.executeQuery(sqlstr);

return rs;
}
catch(SQLException e)
{
System.out.print("获取数据集时出现错误");
}
return null;
}

public static void main(String[] args)
{
mysql1 mysql11 = new mysql1();
Connection conn;
ResultSet rs;
rs= mysql11.executeSql("select * from zms1");
try
{
while(rs.next())
{
System.out.println(rs.getString("name"));
}
}
catch(Exception e)
{
System.out.println(e.getMessage());
}

}

}