很可能您的存储过程的第一个参数大小有限.在 Management Studio 中找到该程序，右键单击，选择 Modify 或 Script->Alter To.. 查找第一个参数的声明并将其更改为 varchar(max) 或 nvarchar(max).

Most likely the first parameter of your stored procedure has limited size. In Management Studio locate the procedure, right click, choose Modify or Script->Alter To.. Look for the declaration of the first parameter and change it to varchar(max) or nvarchar(max).