使用动态SQL从临时表插入表； 错误：将varchar转换为数值类型的算术溢出错误

Question

我正在研究SQL Server存储过程。

这是有效的代码部分：

INSERT INTO [MYBASE].dbo.[DatabaseName]
    ([Employee No_], [From Date], [To Date], [Description], [Quantity],[First Name], [Last Name])   
    SELECT 
        EmployeeNo, FromDate, ToDate, Description, Quantity, 
        FirstName, LastName 
    FROM 
        #User_Data  

现在，我需要更改此部分：

INSERT INTO [MYBASE].dbo.[DatabaseName]

其中DatabaseName将是变量。

我已经试过了：

CREATE TABLE #User_Data 
(
    User_id INTEGER,
    FirstName VARCHAR(30),
    LastName VARCHAR(30),
    EmployeeNo VARCHAR(20),
    Description VARCHAR(50),
    FromDate DATETIME,
    ToDate DATETIME 
)

INSERT INTO #User_Data
    SELECT u.fname, u.lname, u.employee_no,  ... (this works)

DECLARE @InsertStatement VARCHAR(MAX)

SET @InsertStatement =
     'INSERT INTO [MYBASE].dbo.[' + @DatabaseName + ']
               ([Employee No_], [From Date], [To Date], [Description],
                [Quantity], [First Name], [Last Name])   
          SELECT 
              EmployeeNo, FromDate, ToDate, Description,
              Quantity, FirstName, LastName 
          FROM 
              #User_Data'   

    EXEC(@InsertStatement)

但它不起作用。 这是我得到的错误：

将varchar转换为数值数据类型的算术溢出错误。

请帮忙。

Answer 1

我一直在使用同义词来避免在引号中写：

Declare @MyDB as nvarchar(100) = 'myDBName'

if exists(select * from sys.synonyms where name = N'TableinMyDB') drop synonym [TableinMyDB];
exec('CREATE SYNONYM [TableinMyDB] FOR [' + @MyDB + '].dbo.[myTableName];');

 INSERT INTO [TableinMyDB]
               (
                [Employee No_]
               ,[From Date]
               ,[To Date]
               ,[Description]
               ,[Quantity]
               ,[First Name]
               ,[Last Name]
               )   

        SELECT 
               EmployeeNo 
               ,FromDate 
               ,ToDate
               ,Description
               ,Quantity
               ,FirstName
               ,LastName 
                FROM #User_Data