SqlParameter的用法



方式一

SqlCommand command = new SqlCommand(sqlStr, DB.conn);
command.Parameters.Add("@Username", SqlDbType.VarChar);
command.Parameters.Add("@Pasword", SqlDbType.VarChar);
command.Parameters["@Username"].Value = loginId;
command.Parameters["@Pasword"].Value = loginPwd;

方式二

SqlCommand command = new SqlCommand();
command.Connection = DB.conn;
command.CommandText = sqlStr;
command.Parameters.Add(new SqlParameter("@Username", loginId));
command.Parameters.Add(new SqlParameter("@Pasword", loginPwd));

方式三

Sqlcommand cmd=new Sqlcommand(sqlStr, DB.conn);
cmd.parameters.add("@Username",DbType.varchar).value=loginId;
cmd.parameters.add("@Pasword",DbType.varchar).value=loginPwd;

方式四

Sqlcommand cmd=new Sqlcommand(sqlStr, DB.conn);
cmd.parameters.addwithvalue("@Username",loginId);
cmd.parameters.addwithvalue("@Pasword",loginPwd);

方式五

  Sqlcommand cmd=new Sqlcommand(sqlStr, DB.conn);  
  SqlParameter para1=new SqlParameter("@Username",SqlDbType.VarChar,16);
  para1.Value=loginId;
  cmd.Parameters.Add(para1);
  SqlParameter para2=new SqlParameter("@Pasword",SqlDbType.VarChar,16);
  para2.Value=loginPwd;
  cmd.Parameters.Add(para2);

方式六

 SqlParameter[] parms = new SqlParameter[]
 {
     new SqlParameter("@Username", SqlDbType.NVarChar,20),
     new SqlParameter("@Pasword", SqlDbType.NVarChar,20),
 };
 SqlCommand cmd = new SqlCommand(sqlStr, DB.conn);
 // 依次给参数赋值
 parms[0].Value = loginId;
 parms[1].Value = loginPwd;
//将参数添加到SqlCommand命令中
foreach (SqlParameter parm in parms)
{
    cmd.Parameters.Add(parm);
}

参考资料：  SqlParameter用法     http://www.studyofnet.com/news/763.html