从sql server存储过程返回多个数据集

Question

我需要通过Web Api返回基于调用运行5个不同查询的存储过程的Base64 XML输出.

存储过程没有编写(我需要编写)但有5个查询,其中数据是完全不同的表和列等...所以我想知道这是否可能？

我知道在Oracle中你可以返回多个游标,但是使用SQL Server,我可以返回到asp.net 4.5(mvc c#/ Ado.net)多个数据集或集合吗？这有什么例子吗？

只有一个查询的示例

   -- Content Tab
SELECT -- vTC.[TemplateId]  
  t.Name as "Client Name and Document"  ,vTC.[SectionName] ,vTC.[ContentId] ,vTC.[ContentName]
  ,vTC.[ContentDescription],vTC.[ContentValue] ,CAL.ContentValue as "Spanish Content" , iif(S.IsClientSection = 1, 'Global Section','Template Section') as "Global or Template Section"
  ,DT.Title as DataType ,iif(vTC.IsRequired = 1, 'Yes', 'No') as "Required" ,vTC.[DisplayType] 
FROM [dbo].[vwTemplateContent] vTC
 left join dbo.Template t on vTC.TemplateId = t.TemplateId
  left join dbo.DataType DT on vTC.DataTypeId = dt.datatypeid
   left join dbo.Section S on S.SectionID = vTC.SectionID
   left join [dbo].[ContentAlternateLanguage] CAL on vTC.ContentId =    CAL.ContentID
  where vTC.templateid in (1) 
  order by DisplayOrder

Answer 1

如果要获得多个表,则必须在存储过程中编写多个select语句,如下所示:

CREATE PROCEDURE SPName
(
/*Declare your parameters*/
@parm1 dataType
)
AS
BEGIN
/*Write your select statements below*/
-- SELECT * FROM tblName
-- SELECT * FROM tblName2

END

您必须将这些记录填充到您的DataSet中,DataSet支持多个表进入ADO.net.

请参考以下代码填写您的DataSet:

SqlConnection con=new SqlConnection("YourConnection String");
SqlCommand cmd=new SqlCommand();
SqlDataAdapter da=new SqlDataAdapter();
DataSet ds = new DataSet();
cmd = new SqlCommand("SPName", con);
cmd.CommandType = CommandType.StoredProcedure;
cmd.Parameters.AddWithValue("@parm1", id);//if you have parameters.
da = new SqlDataAdapter(cmd);
da.Fill(ds);
con.Close();

在此之后,您可以使用不同的多个记录集

ds.Tables[0]
ds.Tables[1]
..

希望它能帮到你

谢谢

Answer 2

这是一个基本示例：

SQL 过程：

CREATE PROCEDURE usp_getStudentsAndClasses
    @ClassName      varchar(50)
,   @IsActive       bit
AS
BEGIN
    --First select is first table
    SELECT  *
    FROM    Students

    --Second select is second table, etc.
    SELECT  *
    FROM    Classes

    --Third table...
    --Can be more complex, as long as there is a result set
    SELECT  s.FirstName
    ,       s.LastName
    FROM    Students            s
    JOIN    StudentSeating      ss
    ON      s.StudentID     =   ss.StudentID
    JOIN    Classes             c
    ON      c.ClassID       =   ss.ClassID
    WHERE   s.IsActive      =   @IsActive
    AND     c.Name          =   @ClassName

END

C# 函数：

    public DataSet GetDataSet(SqlConnection connection, string storedProcName, params SqlParameter[] parameters)
    {
        var command = new SqlCommand(storedProcName, connection) { CommandType = CommandType.StoredProcedure };
        command.Parameters.AddRange(parameters);

        var result = new DataSet();
        var dataAdapter = new SqlDataAdapter(command);
        dataAdapter.Fill(result);

        return result;
    }

C#用法：

        var connection = new SqlConnection("Your_connection_string");
        var parameters = new SqlParameter[]
        {
            new SqlParameter("ClassName", "Robotics"),       //example of string value
            new SqlParameter("IsActive", true)               //example of numeric value
        };
        var dataSet = GetDataSet(connection, "usp_getStudentsAndClasses", parameters);

        var firstTable = dataSet?.Tables?[0];   //use as any other data table...

请注意，它几乎与用于单表存储过程的代码相同，只是返回的数据类型是 a DataSet，而不是 a DataTable。ADataSet包含MSDN 上的DataTableCollection 更多信息