“无法将参数值从int64转换为int32”

Question

I'm inserting few values into a SQL Server table. When I'm getting the values from the front end they are strings. So I need to convert them to int first, before I can insert them into the table.

I'm using this code:

Int64 x = Convert.ToInt64(some string value);

This x I want to insert into the table, into a column of type numeric(18,0) .

When doing this conversion, I get an error

Failed to convert parameter value from int64 to int32

while my all the values are just like 1000 around.

Answer 1

Use int x = Convert.ToInt32(some string value) and it should work.

Your db expects a value of type Int32 . SQL server won't implicitly convert a 64-bit number to a 32-bit number because of the potential loss of information.

Answer 2

一个Int64范围从−9,223,372,036,854,775,808到9,223,372,036,854,775,807 ，正如你可以看到的是长19个字符（不包括引号），因此不会在18你数值范围适合如果你真的想使用Int64为小号码，如1000，您应该将列修改为数据类型bigint 。

Answer 3

For System.Int64 (long) in sql server side you must use bigint data type. http://msdn.microsoft.com/en-us/library/ms187745.aspx