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 程式師世界 >> 數據庫知識 >> Access數據庫 >> 關於Access數據庫 >> Access數據庫中無效的字符字段的行為

Access數據庫中無效的字符字段的行為

編輯:關於Access數據庫
 

Dealing with Null strings in Access database fIElds

By default Access string fields contain NULL values unless a string value (including a blank string like "") has been assigned. When you read these fields using recordsets into VB  string variables, you get a runtime type-mismatch error. The best way to deal with this problem is to use the built-in & Operator to concatenate a blank string to each fIEld as you read it. For example:

Dim DB As Database
Dim RS As Recordset
Dim sYear As String
Set DB = OpenDatabase("Biblio.mdb")
Set RS = DB.OpenRecordset("Authors")
sYear = "" & RS![Year Born]

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