Introduction to ADO 2

8/8/2019 Introduction to ADO 2

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Welcome to Database Programming.MS Access DB Objects


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Database Table Fundamentals...

Data is stored in tables.

The data is arranged in rows & columns much like aspreadsheet....

Your Access DB has a .MDB file extension


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Database Table Fundamentals...


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You use design view in Access to create your table. You control the data typefor the field and you make a unique or primary field which identifies eachrecord. CustID is my primary field. Notice the small key symbol.


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ADO DataBase Model(Active-XData Access Objects)

Step 1: The Connection object is used to talk to theDB. We give it the location and type of db and itknows how to communicate with our DB.


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Step 2: The Data adapter is used to actuallyread/write our data. It is designed specifically for thetype of DB we are using. For MS ACCESS, we use theOleDbDataAdapter control.


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Step 3: We use a DataSet to hold our data in RAM.We actually work with this data and we do not directlymanipulate the DB table. A dataset can hold morethan one table of information if you like.


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Step 4: We use controls on our form to display thedata. Each textbox is bound to or associated with afield in the DB table we are using. We can use buttonsto navigate through the dataset to display ourrecords.


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Steps for Building a DB Front-End Application

Using a DataGridView Control...

Step 1:

Create your form and rename it if

you like. Drag DataGridView Control to the form

Use the smart tag to choose NewData Source.


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Step 2: The control will launch the Configuration wizard


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Step 3: Choose New connection and browse to your .mdb file thenclick next.


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Step 4: Change the data source to MS Access and navigate to thedatabase using the browse button. Choose Yes if you want theDB to be copied to the project folder or not.


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Step 5: You can decide to copy the connection string to theproject folder in the app_config file. This is a good idea sochoose Yes.


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Step 6: Add the table you want to use and click finish. We willselect all fields. Or you can click on the ones you want thenclick Finish.


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Step 7: You will then see the table with your data displayed. Forthis project, we did not allow edit, updates, or deletes.


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Step 8: Run your app. You can sort columns by clicking on a grid column.Notice the column headers may not look too good. I will show you how tochange those so they say exactly what you want.

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Introduction to ADO 2