VISUAL BASIC DATA SET HOW TO
VISUAL BASIC DATA SET CODE
VISUAL BASIC DATA SET DOWNLOAD

The DataTable's Rows collection and then sets the valuesįor the row's fields. It calls the NewRow method of the TestScoresĭataTable to create a new DataRow object that contains the The values for each field and then calls the Add method of theĭataTable's Rows collection, passing it the array ofĪfter it fills the Students table, the program demonstrates another methodįor filling a table. Program creates an array of objects, one for each field in the table. These steps to build the TestScores table. To the collection's Add method gives the column's name, andĪfter it has defined the Students table's columns, the program repeats It then uses the DataTable's ColumnsĬollection to add definitions for the table's columns. Students, and adds it to the DataSet's TablesĬollection. It creates a new DataTable object, names it The program starts by creating a new DataSet object, giving it the

VISUAL BASIC DATA SET DOWNLOAD

Click here to download the InlineDB example program.

VISUAL BASIC DATA SET CODE

Program InlineDB uses the code shown in Listing 1 to build a database using The New keyword to instantiate the objects, and then use the Your program can declare variables to hold those objects, use There is nothing magical about the DataSet, DataTable,Īnd other classes. Your program can create database objects just like it can create any other

VISUAL BASIC DATA SET HOW TO

Related to DataSets, and shows how to use them. The rest of this article explains some other objects The section after that shows how you can load data from a database Theįollowing section shows how to build a DataSet at runtime using only For example, you can indicate that one of theĭataTable's columns is the table's primary key, disallowsĭuplicates, has a foreign key relationship with a field in anotherĭataTable, or defines a parent-child relationship between twoīefore you get into all those gory details, however, you need to know how to They also provide methods for restricting aĭataTable's data values and for relating one DataTable Figure 2 shows a schematic representationįigure 2 A DataSet represents an in-memory database.ĭataTable objects provide methods for examining, modifying, andĭeleting the data. Those objects hold table-like data similar to theĭata managed by a Recordset. TheĭataSet object's Tables collection may contain any number While a Recordset represents a table-likeĬollection of data, a DataSet represents an in-memory database. Figure 1 showsĪ schematic representation of a Recordset.įigure 1 A Recordset represents table-like data.ĭespite the similarity of name, a DataSet bears little resemblance

The Recordset may provide methods that let you view, modify, add, andĭelete records as you move forward and backward through the data. Table-like view of the data you have selected. You are probably familiar with the Recordset object. If you've been building database programs for a while with Visual Basic,

Visual basic data set