如何将<List>数组传递给存储过程

Question

我在C#中有一个列表ClaimData,它有三个项目日期,类型和描述这里可以有多行,如下所示,

ClaimData

Date         Type      Description

01/02/2012  "Medical" "Its a medical"
05/02/2013  "Theft"   "Its a Theft"
01/02/2014  "Test"    "Its a Test"

我想将这整个数据传递给一个存储过程,一次转到sql server,这样我就可以减少数据库的命中率.我编写了存储过程,可以遍历此列表并将它们插入表中.

如何通过操作列表对象来实现可以作为参数传递给存储过程？

Answer 1

您需要做一些事情来实现这一目标,因为您的参数获得了创建表类型所需的多个值,并使您的存储过程接受该类型的参数.

由于您要传递一个TABLE参数作为参数,您需要创建一个TABLE TYPE,如下所示

表类型

CREATE TYPE dbo.ClaimData AS TABLE 
 (
    [Date]         DATE
    [Type]         VARCHAR(50)
    [Description]  VARCHAR(100)
  )
 GO

存储过程接受该类型参数

 CREATE PROCEDURE mainValues 
 @TableParam ClaimData READONLY   --<-- Accepts a parameter of that type 
 AS                                  -- Note it is ReadOnly 
 BEGIN
    SET NOCOUNT ON;

  --Temp table to store the passed values 
  -- since the passed parameter is only Read only and you
  -- cannot make any changes to the parameter so if you need to
  -- manipulate the data inside parameter you will need to get it
  -- into a Table vaiable.


  -- Declare a Table variable
  DECLARE @tmp_values table(
          [Date]         DATE
          [Type]         VARCHAR(50)
          [Description]  VARCHAR(100)
                            );   

   --Get values into that Table variable 
   INSERT INTO @tmp_values ([Date],[Type],[Description])
   SELECT [Date],[Type],[Description] FROM @TableParam

   -- Do other cool stuff with your passed data 

   SELECT * FROM @tmp_values  --<-- For testing purpose
END

执行PROC

声明该类型的变量并使用您的值填充它.

 DECLARE @Table ClaimData(      --<-- Declare a variable of your type
          [Date]         DATE
          [Type]         VARCHAR(50)
          [Description]  VARCHAR(100)
                            ); 
 -- Populate the variable
   INSERT INTO @Table ([Date],[Type],[Description])
   SELECT [Date],[Type],[Description] FROM Source_Table

EXECUTE mainValues @Table   --<-- Stored Procedure Executed