VISUAL BASIC DATA BASE PASSWORD
password: The password of the user of the mysql database server.user id: The user of the mysql database server.Data Source: We have our database in our local machine, thus I have used “localhost”, if you have your DB at some other computer connected by LAN to your machine, you will put the IP address of that machine instead of localhost.Here, look at the connection string which as currently have 5 parts as follows MsgBox("Connection Error: " & ex.Message.ToString)
VISUAL BASIC DATA BASE CODE
The code looks like the following dbconn = New MySqlConnection("Data Source=localhost user id=root password=demo port=3310 database=vb_mysql") We will open the connection to the DB in the load event of our form which now named as form1 by default. Okay, now we are going to make the connection.
dbread is the one which will hold those data that we will fetch using query from DB.dbcomm is the MySqlCommand that will execute the query.sql is a string, which will actually hold our query.dbconn is the connection to the database.Here we are declaring 4 public objects that we will use. Now, just below Public Class Form1 write the followings Public dbconn As New MySqlConnection
This will allow us to use various types, methods and classes of the Connector. Now Double-Click on the form to bring the code editor.Ībove everything, write this Imports We are done with the database and form so far, lets start coding in the next part. If you try, you receive the following error message: "Could not decrypt file."Įxcel 2007 Files Provider=.12.0 Data Source=c:\myFolder\myExcel2007file.xlsx Extended Properties="Excel 12.That’s it. If the Excel workbook is protected by a password, you cannot open it for data access, even by supplying the correct password with your connection string. That's the key to not letting Excel use only the first 8 rows to guess the columns data type. Excel worksheet name followed by a "$" and wrapped in "" brackets.Ĭheck out the located registry REG_DWORD "TypeGuessRows". Note that this option might affect Excel worksheet write access negative.
VISUAL BASIC DATA BASE DRIVER
"IMEX=1 " tells the driver to always read "intermixed" (numbers, dates, strings etc) data columns as text. "HDR=Yes " indicates that the first row contains columnnames, not data. The quote " in the string needs to be escaped using your language specific escape syntax.
Provider=.4.0 Data Source=C:\MyExcel.xls Extended Properties="Excel 8.0 HDR=Yes IMEX=1"
excel worksheet name followed by a "$" and wrapped in "" brackets. Here are some example connection strings to connect to some common database typesĭriver= DriverId=790 Dbq=C:\MyExcel.xls DefaultDir=c:\mypath The usual way to connect to a database from VB is to use ADO (ActiveX Data Objects).Ĭonnecting to databases usually happens with a connection string. Nonetheless we can explain the basics of connecting to databases, retrieving information from them and so on. Database management as a subject in its own right is far too big to be dealt with in this book and would distract from the principal subject which is programming in VB Classic.
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