使用VB.Net中的查询更新Access中的列

Question

I need to update a column by adding a value in Access:

update table1 set column1 = column1+value

In the above, if column1 is null, then the table is not updated.

I need a function like in SQL Server:

update table1 set column1 = isnull(column1,0) + value

Answer 1

You do not give a data type for column1. The string concatenator is & not +, so consider:

UPDATE Table1  
SET Table1.AText = [AText] & "A", 
    Table1.ANumber = Nz([ANumber],0)+1;

In both these examples, the column (field) will be updated even if it is null.

Answer 2

我认为如果您使用Access作为数据库（后端），则查询中没有选项