Fork me on GitHub

SQL Server 存储过程 数组参数 (How to pass an array into a SQL Server stored procedure)

Resource from StackOverflow

使用存储过程,如何传递数组参数?

1.分割解析字符串,太麻烦
2.添加Sql Server 自定义类型 sp_addtype

问题需求:需要向SP 传递数组类型的参数
select * from Users where ID IN (1,2,3 )

Sql Server 数据类型 并没有数组,但是允许自定义类型,通过 sp_addtype
添加 一个自定义的数据类型,可以允许c# code 向sp传递 一个数组类型的参数
但是不能直接使用 sp_addtype,而是需要结构类型的数据格式,如下:

CREATE TYPE dbo.IDList
AS TABLE
(
  ID INT
);
GO

有点像个是一个临时表,一种对象,这里只加了ID
在sp 中可以声明自定义类型的参数

CREATE PROCEDURE [dbo].[DoSomethingWithEmployees]
    @IDList AS  dbo.IDList readonly

Example

1. First, in your database, create the following two objects

CREATE TYPE dbo.IDList
AS TABLE
(
  ID INT
);
GO

CREATE PROCEDURE [dbo].[DoSomethingWithEmployees]
    @IDList AS  dbo.IDList readonly
    
AS
     SELECT * FROM [dbo].[Employees] 
      where ContactId in
       (  select ID from @IDList )
RETURN 

2. In your C# code

// Obtain your list of ids to send, this is just an example call to a helper utility function
int[] employeeIds = GetEmployeeIds();
DataTable tvp = new DataTable();
tvp.Columns.Add(new DataColumn("ID", typeof(int)));
// populate DataTable from your List here
foreach(var id in employeeIds)
      tvp.Rows.Add(id);
using (conn)
{
    SqlCommand cmd = new SqlCommand("dbo.DoSomethingWithEmployees", conn);
    cmd.CommandType = CommandType.StoredProcedure;
    SqlParameter tvparam = cmd.Parameters.AddWithValue("@List", tvp);

    // these next lines are important to map the C# DataTable object to the correct SQL User Defined Type
    tvparam.SqlDbType = SqlDbType.Structured;
    tvparam.TypeName = "dbo.IDList";
    
    // execute query, consume results, etc. here
}
posted @ 2019-09-07 15:30 StoneLeee 阅读(...) 评论(...) 编辑 收藏