使用函数传递参数来执行数据库操作

using System;
using System.Configuration;
using System.Data.SqlClient;
using System.Data;
using System.Collections;
比如：
// 打开数据库
public static SqlConnection OpenConnection()
  {
SqlConnection mysqlConn = new SqlConnection(ConfigurationSettings.AppSettings["connstring"]);

try
{
 mysqlConn.Open();
}
catch (Exception e)
{
 //rethrow this exception
 throw e;
}

return mysqlConn;
  }

// 执行SQL返回DataSet
public static DataSet GetDataSet(string SQLQuery)
  {
SqlConnection cn = DBObject.OpenConnection();
SqlDataAdapter da = new SqlDataAdapter(SQLQuery, cn);
DataSet ds = new DataSet();

da.Fill(ds);

//release resources
da.Dispose();
da = null;
cn.Close();
cn = null;

return ds;
  }

// 执行SQL语句
public static void ExecuteUpdateQuery(string SQLQuery)
  {
SqlConnection cn = DBObject.OpenConnection();
SqlCommand cmd = new SqlCommand();

cmd.CommandText = SQLQuery;
cmd.CommandType = CommandType.Text;
cmd.Connection = cn;
cmd.ExecuteNonQuery();

cn.Close();
cn = null;
  }