The scope of the Variables in VBA - Part 1

The scope of the variables means when we declare variable to hold some information in it, we need to provide those variables with some datatypes. DataTypes could be anything. Integer, long, string, variant etc...

Sometimes we required a single variable to use it in multiple procedures and even throughout the whole project of the workbook sometimes.


To understand the scope of the variables, we need to understand the basic structure of the VBA. Whatever the procedure you create it depends on your declaration, how you want to use those subprocedures and variables.

There are three layers of the project.

1. Procedure
2. Module
3. Project

the bottom layer is Procedure

Like whatever you will define will stay up to that procedure only.

E.g.

insert the module and type the following sub-procedure.

'/------------------------------------------

Private Sub Testing1()
'This is the Procedure.
       Dim A as long
       A = 1
       msgbox A
End Sub
'/------------------------------------------

Private Sub Testing2()
       msgbox A
End Sub

'/------------------------------------------

The output of Testing1 will be "1"
and The output of Testing2 will be "0" or blank

Because we have declared variable A in sub procedure. and that variable A has the scope of up to that Testing1 Procedure only.

So it's seems a private variable declaration.

you can notice... procedural declaration has effect until its own procedure only. that's the concept. we can do more and more.

But Scope is not only limited up to variables. It also applies to the declaration of procedure too. but we will look forward to it in next part.

thank you.

- Kamal Bharakhda

Concept of Connecting MySQL data into the EXCEL using VBA

There're numerous modules available on the internet about Importing MySQL Data into Excel using VBA. But What they don't explain is about the concept of the Connection string. you need to understand few important attributes of connecting MySQL server with ODBC Drivers.

We need the following few things to attempt this procedure.

1. Go to the Tools > References > and choose Microsoft ActiveX Data Objects x.x Library (6.1 in my case) 
2. Then we need to create two objects with ADODB (ActiveX Data Objects), one for connection and one for data storage (which brings data with it).

We refer,
Connection as ADODB.Connection, and 
Recordset as ADODB.Recordset

The first part is over. Now, comes the toughest part of the program where we need to create the connection between our excel workbook and the MySQL server where your data is kept under tables.

Now, to connect both excel and server, we need to address the things very properly. and it should be. because without providing the proper addressing, we will surely get the frustrating errors. anyway, let's get back to the point. so, addressing the server correctly, we need to provide the various pieces of information to the objects. and those pieces of information are attributes which we will use to get the perfect data as queried.

Here are those important attributes / element. 
- Driver / Provider
- Server Name / Host
- DataSource / Database 
- Initial Catalog / Table Name 
- Username 
- User Password
- Port No.

You need someone who supports you while reaching towards your destination. that we called a DRIVER. the first element. there are many attributes we required to mention but the DRIVER is the most sensitive part of the program. Because it requires the damn clear conception of ODBC Driver. (There are many kinds of drivers, but mostly ODBC driver has been used to fetch the MySQL Server Data)

ODBC is the clear and simple driver/software, which will use your attributes/elements and will reach the perfect destination using your SQL Queries. Let's looks at the definition of ODBC by Microsoft. "Open Database Connectivity (ODBC) interface by Microsoft that allows applications to access data in database management systems (DBMS) using SQL as a standard for accessing the data."

Now, ODBC Drive Which I have used is. "MySQL ODBC 5.3 ANSI Driver". There are many version available of the same software but I prefer to use this because it's the most successful one till.

You can find the ODBC driver in the System Drive C: > Windows Folder.

now the most important thing to remember is that, where this file is actually placed?

if your Windows operating is 32bit and office application also 32bit then VBA will look the ODBC driver in the system32 folder under windows. there's no issue at all.

but what if you have 64bit windows and running the 32bit office? you will face Driver Lost errors. It's just because, mostly all active drivers in the 64bit windows are kept in SYSWOW64 named folder under the same windows folder. So you need to copy that driver from system32 to the syswow64 folder.

but first, find the driver which named as odbcad32.exe (you can even find that drive in Administrative Tools)

Double click and find the DRIVER tab. you will get the above-mentioned ODBC driver name there. what if you don't have that driver specified there? just don't worry. Google the "MySQL ODBC 5.3 ANSI Driver" to download that driver's MSI form. and installed it. it has nearly an 8 MB of size. and I recommend you to choose 32bit if your office is 32bit. vice versa.

after installing, check the driver tab again, you will get that name there.... and now try your code again. you will get the result. and that's how I get.

it's the only thing which hasn't been discussed anywhere. so I thought I should share with you the proper concept.

thank you.



- Kamal C Bharakhda 

The Wonderful Login System for the Excel VBA

This is Kamal Bharakhda & I'm here presenting my tools for Excel VBA Workbooks for its protection. Yes, I have named this Application as "The Wonderful Login System" What it actually does, it will help you to make secure your Excel Workbooks at high-level. Yes, this application will use the online resources to compare the login credentials. Main Operation & Features of using my Login System. 1. Your application will not be accessed off-line. Yes, if your system has active internet, then only you can access the login system in the first place. 2. After checking the activeness with the Internet, you will see the Login form right at the moment. Now, Enter your credentials. 3. After entering the user details, you need to hit the "LOGIN" button once, and it will compare your provided pieces of information with an online database, and if it goes wrong then it gives the wrong messaged popups. 4. Let's say if you want to restrict one of the users the workbook, then you just need to change the password from the database. after that, that user will not be able to access the document furthermore. 5. Wonderful Login System will also check the System Compatibility. Suppose, one of the users has copied your workbook for the data... then the user will not be able to access that workbook from the different system, even if the user is providing the user credentials correct or not! So, in short, your workbook will be copy protected. Isn't it awesome tools for the industry where the data security is highly demanding things? Well, I'm also thinking of to adding more features, if you advise me to do so. But I'm so much excited to distribute this awesome tool. I hope it will help you in your work. Email me for any queries. I'm here providing the link of the video representation of my Wonderful Login System. Please have look to it. https://www.youtube.com/watch?v=VYuAP... -- Thank You, Regards Kamal C. Bharakhda | VBA (Excel) Developer Ahmedabad +91 - 9328093207 kamal.9328093207@gmail.com Skype : bharakhdakamal