Access vba variant

Returns an Integer indicating the subtype of a variable. The required varnameargument is a Variant containing any variable except a variable of a user defined type. Although the Variant data type is flexible, VBA processes these data types a little slower because it must determine the most accurate data type for the assigned value. The definition of a Public variable is a variable that any module, Sub Procedure, Function or Class can access and use within a certain workbook. This chapter will teach you how to manipulate these functions using VBA.

Since there is now an intrinsic Date type, there is no further need for CVDate. VBA is a different dialect of the same language and so should be treated differently. If qualified with the type-library name, Array is unaffected by Option Base. In VBA you can assign a Boolean variable to True (-1) or False (0) or the numbers indicated in the brackets. Access VBA to Import a CSV File with Variable Name.

If, for example, you created a specification name that is saved as client_list_specification, then you’ll need to put that name within quotations: “client_list_specification” “Table” is the name of the Access table where the imported information, from the CSV file, will be stored. Below is a list of common VBA variables (known as data types) used in macros, and their purposes: Integer: Used to store number values that won’t take on decimal form. Single: Used to store number values that may take on decimal form. Can also contain integers.

Double: A longer form of the single variable. In this tutorial we will learn about VBA Variables. Next we will dive into the Data Types available in Excel VBA.

We will continue with diving into more advanced topics. So what is a variable ? Before you assign a value to a declared VBA variable, Excel assigns the default value. In the case of string type variables (such as String and Date), the default value is an empty string (“”), or the ASCII code (or Chr(0)).

This depends on whether the length of the string is variable or fixed. Assign the object variable to an object. Declare the object variable. A variable that refers to an object must be a Variant , an Object, or a specific type of object. Check if variant is null in VBA.

Ask Question Asked years, months ago. A CVDate function is also provided for compatibility with previous versions of Visual Basic. The syntax of the CVDate function is identical to the CDate function, however, CVDate returns a Variant whose subtype is Date instead of an actual Date type. To use a VBA variable in a query, you need to write a VBA function that returns the value of the variable as its return value and then reference the VBA function either as part of a calculation or in the criteria of a field.

The only way to work with VBA in queries is to call a function. This solution shows you how to do that. When you use the variable wk with a decimal point, VBA will automatically display the available options for the variable. You can see the Intellisense in the screenshot below. If you use Variant as a type then the Intellisense will not be available.

This is because VBA will not know the variable type until runtime. The good news is that VBA provides the tools and objects to massively speed things up. The key to this is to use variant arrays to grab all the data from a woksheet or range and then to work on this array. The performance improvements can be dramatic - something that takes hours can be done in minutes. MS Access: VarType Constants.

This MSAccess tutorial explains how to use VarType in Access with syntax. The syntax for the VarType function is: VarType( variable _name) It returns the type of value is currently stored in variable _name. Only the Variant data type can hold the value Null. A Variant can also contain the special values Empty, Error, Nothing, and Null. However, date can also be any expression that can represent a date, a time, or both a date and time, in that range.

I have a login screen which compares data via a Dlookup in order to authenticate users. Dim x As Variant x = Null. I would like to create a global variable upon a correct login that any form on the database can call on and t.