jdbc无法执行删除操作

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.SQLException;
import java.util.Scanner;
public class delt {

/**
 * @param args
 */
public static void main(String[] args) {
    // TODO Auto-generated method stub
    //装载驱动
    Connection con=null;
    PreparedStatement pre=null;
    Scanner input=new Scanner(System.in);
    System.out.print("输入要删除的姓名:");
    String name=input.next();

            try {
                Class.forName("com.microsoft.sqlserver.jdbc.SQLServerDriver");
                //得到数据库的连接对象
                String url="jdbc:sqlserver://127.0.0.1:1433;DatabaseName=us";
                con=DriverManager.getConnection(url,"sa","123456");
                //编写SQL语句
                String sql="delete name from st where name=?";
                //建立一个预处理对象

                pre=con.prepareStatement(sql);
                pre.setString(1,name);
                System.out.println("11");

                int i=pre.executeUpdate();
                //con.commit();
                System.out.println("22");

                if(i>0)
                    System.out.println("删除成功");
                else
                    System.out.println("操作未成功");
            } catch (ClassNotFoundException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            } catch (SQLException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }finally{
                try {
                    con.close();
                } catch (SQLException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }
            }
}

}

输入要删除的姓名:王二
11
com.microsoft.sqlserver.jdbc.SQLServerException: 对象名 'name' 无效。
at com.microsoft.sqlserver.jdbc.SQLServerException.makeFromDatabaseError(Unknown Source)
at com.microsoft.sqlserver.jdbc.IOBuffer.processPackets(Unknown Source)
at com.microsoft.sqlserver.jdbc.SQLServerPreparedStatement.getPrepExecResponse(Unknown Source)
at com.microsoft.sqlserver.jdbc.SQLServerPreparedStatement.doExecutePreparedStatement(Unknown Source)
at com.microsoft.sqlserver.jdbc.SQLServerPreparedStatement$PreparedStatementExecutionRequest.executeStatement(Unknown Source)
at com.microsoft.sqlserver.jdbc.CancelableRequest.execute(Unknown Source)
at com.microsoft.sqlserver.jdbc.SQLServerConnection.executeRequest(Unknown Source)
at com.microsoft.sqlserver.jdbc.SQLServerPreparedStatement.executeUpdate(Unknown Source)
at delt.main(delt.java:33)

错误在这：delete name from st where name=?

正确写法：delete from 表名 where name = ‘王二’

数据库中的 name 字段名正确吗？

最好把jdbc和功能实现分开写，不然出现错误会很乱。