利用sql server2000 查询过程中 写的几个函数和在.NET中的执行

查询市份 函数

CREATE function user_register_address_city_info_modify
(@username nvarchar(15))
returns nvarchar(15)
begin
declare @user_city_name nvarchar(15)
select @user_city_name=city_name
from city_info
where city_info.c_id=(select u_address_city from user_info where username=@username)
return @user_city_name
end
执行情况如下：select wotian_things.dbo.user_register_address_city_info_modify('lgq12345') AS 'user_active_flag'
－－－－时间转化函数－－－－
CREATE function change_date
(@date_str smalldatetime)
returns char(14)
begin
declare @date_str_para char(14)
set @date_str_para=cast(year(@date_str) as char(4))+'年'+cast(month(@date_str) as char(2))+'月'+cast(day(@date_str) as char(2))+'日'
return @date_str_para
end
在查询分析器执行情况 select wotian_things.dbo.change_date('2005-12-01') as '日期格式'

具体的 一个函数
private int user_address_select(string str_user)
{
int user_address_select_flag;
string str_sql="select wotian_things.dbo.user_address_flag('str_user') AS 'user_address_select_flag'";
SqlConnection myConnection = new SqlConnection(System.Configuration.ConfigurationSettings.AppSettings["ConnectionSqlServer"]);
myConnection.Open();
SqlCommand mysqlcommand = new SqlCommand(str_sql,myConnection);
mysqlcommand.CommandType = CommandType.Text;
user_address_select_flag=(int)mysqlcommand.ExecuteScalar();
myConnection.Close();
return user_address_select_flag;
}