SqlServer中存储过程 returnC#代码处理以及对应的MySQL如何改写

一.SqlServer 中

1. 创建表

create table testuser(
 id int, --primary key,
 names varchar(50),
 address varchar(50),
 paw varchar(50)
)

2.创建存储过程

create proc testp12(@id int ,@names varchar(50),@address varchar(50),@paw varchar(50))
as
begin
 declare @maxid int
 if @id is null or @id<5
 begin
  return -1;
 end
--set IDENTITY_INSERT testuser on
 insert into testuser(id,names,address,paw)values(@id,@names,@address,@paw)
--set IDENTITY_INSERT testuser off
  select @maxid=(select max(id) from testuser)
 return @maxid
end 

3.c#对应的代码处理

  #region"SqlServer中存储过程Return返回值处理"

        /*
        public void getresult(int id, string names, string address, string pwd)
        {
            string str = " server=192.168.xxx;user id=xx;password=xxxxxxxx;database=xxxxx_xx;min pool size=4;max pool size=4;packet size=3072";
            SqlConnection conn = new SqlConnection(str);
            conn.Open();
            SqlCommand cmd = new SqlCommand();
            cmd.CommandType = CommandType.StoredProcedure;
            cmd.CommandText = "testp12";
            cmd.Parameters.Add(new SqlParameter("@id", SqlDbType.Int));
            cmd.Parameters["@id"].Value = id;
            cmd.Parameters.Add(new SqlParameter("@names", SqlDbType.VarChar, 50));
            cmd.Parameters["@names"].Value = names;
            cmd.Parameters.Add(new SqlParameter("@address", SqlDbType.VarChar, 50));
            cmd.Parameters["@address"].Value = address;
            cmd.Parameters.Add(new SqlParameter("@paw", SqlDbType.VarChar, 50));
            cmd.Parameters["@paw"].Value = pwd;
            cmd.Parameters.Add(new SqlParameter("@return", SqlDbType.Int));
            cmd.Parameters["@return"].Direction = ParameterDirection.ReturnValue;
            cmd.Connection = conn;
            cmd.ExecuteNonQuery();
            conn.Close();
            Response.Write(cmd.Parameters["@return"].Value.ToString());
            Response.Write("<br/>");
            Response.Write("hello world");

        }*/
        #endregion

二.MySQL中

1.创建表

create table testuser(
 id int,  names varchar(50),
 address varchar(50),
 paw varchar(50)
)

2.创建函数

create FUNCTION testp12(_id int , _names varchar(50), _address varchar(50), _paw varchar(50) )
RETURNS INT
  label_pro: BEGIN
 declare _maxid int;
  declare returnid int;
 if _id is null  or _id<5 then
 begin
    set returnid=-1;
   RETURN returnid;
    leave label_pro;
 end ;
end if;
-- set IDENTITY_INSERT testuser on
 insert into testuser(id,`names`,address,paw)values(_id,_names,_address,_paw);
-- set IDENTITY_INSERT testuser off
  set _maxid=(select max(id) from testuser);
  set returnid=_maxid;
   RETURN returnid;
end 

3.C#代码实现----函数实现

  #region"函数实现SqlServer中存储过程功能Return"
        /// <summary>
        /// 函数实现SqlServer中存储过程功能
        /// </summary>
        /// <param name="id"></param>
        /// <param name="names"></param>
        /// <param name="address"></param>
        /// <param name="pwd"></param>

         public void getresult(int id, string names, string address, string pwd)
        {
            string str = "Server=192.168.xxxx;Database=xxxx_xxx; port=xxxx;user id=xxxxx;password=  providerName=MySql.Data.MySqlClient";
            MySqlConnection conn = new MySqlConnection(str);
            conn.Open();
                MySqlCommand cmd = new MySqlCommand();
            cmd.CommandType = CommandType.StoredProcedure;
            cmd.CommandText = "fnetravel2_db.testp12";
            cmd.Parameters.Add(new MySqlParameter("_id", MySqlDbType.Int32));
            cmd.Parameters["_id"].Value = id;
            cmd.Parameters.Add(new MySqlParameter("_names", MySqlDbType.VarChar, ));
            cmd.Parameters["_names"].Value = names;
            cmd.Parameters.Add(new MySqlParameter("_address", MySqlDbType.VarChar, ));
            cmd.Parameters["_address"].Value = address;
            cmd.Parameters.Add(new MySqlParameter("_paw", MySqlDbType.VarChar, ));
            cmd.Parameters["_paw"].Value = pwd;
           // cmd.Parameters.Add(new MySqlParameter("returnid", MySqlDbType.Int32));
            //cmd.Parameters["returnid"].Direction = ParameterDirection.ReturnValue;
            cmd.Parameters.Add("returnid", MySqlDbType.Int32, );
            //设置参数的类型为输出参数,默认情况下是输入,
            cmd.Parameters["returnid"].Direction = ParameterDirection.ReturnValue;
            cmd.Connection = conn;
            cmd.ExecuteNonQuery();
            string name = cmd.Parameters["returnid"].Value.ToString();
            conn.Close();
            Response.Write(name);
            Response.Write("<br/>");
            Response.Write("hello world");

        }
        #endregion

4.存储过程实现

create PROCEDURE testp122(in _id int ,in _names varchar(50),in _address varchar(50),in _paw varchar(50),out returnid int )
label_pro:BEGIN
 declare _maxid int;
  -- declare returnid int;
 if _id is null  or _id<5 then
 begin
    set returnid=-1;
    leave label_pro;
 end ;
end if;
-- set IDENTITY_INSERT testuser on
 insert into testuser(id,`names`,address,paw)values(_id,_names,_address,_paw);
-- set IDENTITY_INSERT testuser off
  set _maxid=(select max(id) from testuser);
  set returnid=_maxid;
end 

5.C#代码实现----存储过程

 #region"mysql存储过程实现SqlServer中存储过程功能Return"
        /// <summary>
        ///
        /// </summary>
        /// <param name="id"></param>
        /// <param name="names"></param>
        /// <param name="address"></param>
        /// <param name="pwd"></param>
        public void getresult(int id, string names, string address, string pwd)
        {
            string str = "Server=192.168.xxxxxx;Database=xxxxx_dxxxxxxb; port=xxxxx;user id=xxxxx;password= providerName=MySql.Data.MySqlClient";
            MySqlConnection conn = new MySqlConnection(str);
            conn.Open();
             MySqlCommand cmd = new MySqlCommand();
            cmd.CommandType = CommandType.StoredProcedure;
            cmd.CommandText = "fnetravel2_db.testp122";
            cmd.Parameters.Add(new MySqlParameter("_id", MySqlDbType.Int32));
            cmd.Parameters["_id"].Value = id;
            cmd.Parameters.Add(new MySqlParameter("_names", MySqlDbType.VarChar, ));
            cmd.Parameters["_names"].Value = names;
            cmd.Parameters.Add(new MySqlParameter("_address", MySqlDbType.VarChar, ));
            cmd.Parameters["_address"].Value = address;
            cmd.Parameters.Add(new MySqlParameter("_paw", MySqlDbType.VarChar, ));
            cmd.Parameters["_paw"].Value = pwd;
            // cmd.Parameters.Add(new MySqlParameter("returnid", MySqlDbType.Int32));
            //cmd.Parameters["returnid"].Direction = ParameterDirection.ReturnValue;
            cmd.Parameters.Add("returnid", MySqlDbType.Int32, );
            //设置参数的类型为输出参数,默认情况下是输入,
            cmd.Parameters["returnid"].Direction = ParameterDirection.Output;
            cmd.Connection = conn;
            cmd.ExecuteNonQuery();
            string name = cmd.Parameters["returnid"].Value.ToString();
            conn.Close();
            Response.Write(name);
            Response.Write("<br/>");
            Response.Write("hello world");

        }

    }
        #endregion

看到上面想到是不是SqlServer中也可以实现这个功能，但是测试发现SqlServer中函数不允许insert语句。但是如果函数返回表则是可以的。如这个函数：

CREATE FUNCTION func(@selection int)
RETURNS @table TABLE
(
id char(4) primary key not null,
names nvarchar(4) null
)
AS
BEGIN
IF @selection = 0
INSERT INTO @table SELECT id,names FROM testuser
ELSE
INSERT INTO @table SELECT id,names FROM testuser
Return
END

这些例子都是我实践得到了。
记录一点点，收获一点点。