Results for "Category: Databases/ Data Access/ DAO/ ADO"
This code pastes into a Module that Create (if not exists) a MDB to record the errors that occur in your application.
A "single-form" utility program, to be used (1) when one does not have an Access program in hand, but wants to create an Access DB or to modify the structure of an existing one, or (2) if one wants to include a simple form as a handly tool in a project involving DB. The program provides functions (i) to display the hierarchical structure, properties and other relevant information of a database; (ii) to rename or delete tables/fields/indexes/queries (or delete relations); (iii) to create a new DB from scratch or by copying the selected tables from an existing DB, with or without index and/or data; (iv) to build a new table with specific field and index property settings; (v) to re-start an auto increment field; (vi) to print a table structure; and (vii) to browse &/or copy records, etc.
For ADO database application: To show (1) How to use ADO schema to obtain a list of tables of a database. (2) How to provide a re-usable single form for any MDB file name, and with another form to display as many tables as there are in that database at the same time. Otherwise, you will have to repeatedly create/refer to an instance of connection and you may need 10 forms if there are 10 tables in a database (see "3"). (3) The possible techniques to enable opening several tables on the screen in the same session, yet without conflict (otherwise if you create 10 instances of the same form, some common event handlers will mix up Table B as Table A, e.g. when calling yet another form. But with appropriate techniques, this conflict is avoided). (4) How to display various properties/attributes/status in descriptive text(pneumonic), rather than the VB's original numeric codes. Note: MS TreeView itself limits the node count to 32767 only. (For a comparative study of DAO, refer my DBofDAO)
All fields in the selected table are processed and the AllowZeroLength property of the fields are set to either True or False, depending on the Status given as the finaal parameter The function returns a boolean value that can be used by the user to determin other operations.
When using Autonumber fields in a database for a UID, you might need this value after you add the record, for that record. This is my example of how to get that value back from the database after it is added using DAO or ADO.
The code demonstrates 3 common combobox tasks: 1.) Filling a cbo with a recordset 2.) Setting the cbo Text to a recordset field using a numeric rst field 3.) Setting the cbo Text to a recordset field using a non-numeric rst field
This simple code allows to make an auto-filled textbox (like an adress box in IE). This example uses an DataEnvironment connection, but it can be easy used in any other cases.
Converts the timestamp data type of SQL server into a string that is then suitable for use in a where clause
how to use SQL to extract desired information from a database
Easily Compact & Repair a MS Access Database and display the size differences.
Accesses any ODBC database using ADO. Records are displayed in a table withe rows that alternate colors. Paging control code allows the user to select which page in the recordset to go to. Current code has been tested with Microsoft Access and SQL 7.0.
Very simple application that stores information about software. Stores Title,Serial#/CD-Key, Company/Author. Most significant thing is the use of DAO 3.6 to manipulate the database and write the report for printing. Code is commented, and clean. Limited error-checking and input checking. I do not plan on doing much more with this program, other than use it to keep a list of my own software. Please give me comments, votes NOT needed or requested.
((UPDATED!!!)) I commented the code and added a "Generate Character Stats" button on the Add Character form... I still need to add some rules for the generation. This is a new program I am just beginning to work on. I would like ideas on what to add. It is far from finished, but like I said, I would like some ideas. It uses an Access2000 database (included) and I have included an executable.
This is a new version. New additions include 2 types of code, one project-based the other snippets and functions. More settings added, including large or small toolbar icons, dock list on left or right, activate and maintain transparency. Checks to see if the program has run before, and if not, it sets up the default Registry settings, and if so, it just runs the program. Now asks for database location based with the default bein App.Path\codelib.mdb. I am starting to get more reuseable code. Combining forms and functions based on the type of code and user action. I will eventually combine the ViewCode and Add/Edit code forms for both types. It will require a full rewrite of most of the functions and redesign of the forms. Also in the works is the program's compiled HTML help file. I have almost completed the commenting of the Sub/Function purposes. Please bear with me as the commenting of the code is not the highest priority, getting a working, useable application is the priority. I have included two (2) versions of the actual database: codelib.mdb-Access 2000, and codelib-97.mdb-Access 97. Please leave me comments and questions on the code itself. Votes are appreciated, but not needed. I would rather have the comments.
Asynchronous Database Processing via Active EXE - When processing thousands of requests for a multi-user real-time application, you cannot afford to wait for the relatively slow database processing to occur. Here's the scenario: You have 1000 people already online and playing your multi-user game, and 10 people in the process of logging on right now. What do you do? You could process the logons right now, searching through thousands of user records, to load up their information - but then the game would appear to 'hang' for everyone already playing, waaaay bogus. You could process only 1 person at a time, in the main processing loop - that's better, but will add unnecessary slowdown to your program. What if you could log on the person in a BACKGROUND process, which wouldn't slow down the existing users? Ooh yeah. Or better yet, hand the request off to a machine across the network, dedicated to database processing? NOW we're talking! :-) You can do this easily, using Visual Basic ActiveX EXE's. Have fun with it!
This code allows you to connect to a SQL Server database without creating an ODBC Connection.
This project uses ADO to copy tables from one Access database to another. I did this up as a demo of ADO at work. It (probably) has no actual use but demonstrates ADO connection. This is my first submission, so please, Be Gentle!
Have you ever needed to view a database on a computer without MS Access? Here's an alternative. It uses ADO 2.1 to open, view & edit MS Access, SQL server, DSN and Oracle databases. There are also a few features to let you add, rename and delete tables as well as purge based on a Date/Time field. Clearly not a replacement for MS Access, but you can distribute it to help troubleshoot. Automatically registers itself as the default database viewer for .mdb files on systems without a default already set. Otherwise, it becomes a second option when right-clicking. Its Biggest advantage is its all ADO. No DAO at all. Now you're able to modify older versions of Access databases when Access itself requires a conversion!! I recommend distributing MDAC 2.5 even if you have a 2.1 application. Microsoft seems to have fixed some of the install problems with the MDAC 2.1. Please Note that you MUST HAVE the Oracle client installed on your PC to use the Oracle connection!!http://www.microsoft.com/data/download.htm ** Updated 3/21/2000 **Added Password support for Access databases.Please vote!
This will allow you to get BMPs (only Bitmaps) from an Access database using ADO. Officially, Microsoft says this about it in MSDN:INFO: Issues Migrating from DAO/Jet to ADO/Jet ID: Q225048 OLE Container Control Many databases, including the SQL Server 7 Northwind database, contain pictures and other objects saved by Microsoft Access. In Visual Basic, you can see the pictures by binding the OLE Container control to the DAO Data control. However, the OLE Container control is not compatible with the ADO Data control and there is no way to access these pictures and display them using ADO. The OLE Container control cannot be used unbound because GetChunk does not retrieve the data in a format compatible with the ReadFromFile method. Please Vote!
select any access database then select the table you want then select and insert any fields to a richtextbox then preform a mail merge like MSWord. you can then browse through the database while viewing the merged data.