VB.Net - Database Access
Nov 03, · Establish Connection to Database Connect to a database. Select tab from top menu-bar TOOLS, then Connect to Database Browse your database file and click the OK button. View database in Server Explorer On the View menu, click Server Explorer. Right-click Data Connections, and then click Add connection. In the Data Link Properties dialog box, click localhost in the Select or enter a server name box.
Applications communicate with a database, firstly, to retrieve the data stored there and present it in a user-friendly way, and secondly, to update the database by inserting, modifying and deleting data. Microsoft ActiveX Data Objects. Net ADO. Net is a model, a part of the. Net framework that is used by the. Net applications for retrieving, accessing and updating data.
Iwth object model is nothing but the structured process flow through various components. The vb.met residing in a data store or database is retrieved through the data provider. Various components of the data provider retrieve data for the application and update data. A data provider is used for connecting to a database, executing commands and retrieving data, storing it in a dataset, reading conject retrieved data and updating the database.
A command is a SQL statement or a stored procedure used to retrieve, insert, delete or modify data in vh.net data source. This is integral to the working of ADO. Net since data is transferred to and from a database through a data adapter.
It retrieves data from a database into a dataset and what does the name kellen mean the database. When changes are made to the dataset, the changes in the database are actually done by the data adapter. DataSet is how to connect database with vb.net in-memory representation of data.
It is a disconnected, cached set of records that are retrieved from a database. When a connection is established with the database, the data adapter creates a dataset and stores data in it. After the data is retrieved and stored in a dataset, the connection with the database is closed.
This is called the 'disconnected architecture'. The dataset works as a virtual database containing tables, rows, and columns. The DataSet class is present in the System.
Data namespace. It contains additional information, like hos SQL statement for retrieving data, time of retrieval, etc. It represents a table in the DataTableCollection of a dataset. It consists of databzse DataRow and DataColumn objects. The DataTable objects are case-sensitive. It represents a relationship in the DataRelationshipCollection of the dataset. It is used to relate two DataTable objects to each other through databbase DataColumn objects.
It represents a fixed customized view of a DataTable for sorting, filtering, searching, editing and navigation. It represents a row in the DataTable. The DataRow object and its properties and methods are used to retrieve, connwct, insert, delete, and update values in the DataTable. The NewRow method is used to create a new row and the Add method adds a row to the table.
In how to connect database with vb.net example, let us access data in a DataGridView control using code. So far, we have used tables and databases already existing in our computer. In this example, we will create databwse table, add columns, rows and data into it and display the table using a DataGridView object. Net - Database Access Advertisements. Previous Page. Next Page. Previous Dagabase Print Page. Dashboard Logout. Connection This component is used to set up a connection with a data source.
Command A command is a SQL statement or a stored procedure ot to retrieve, insert, delete or modify data in a data source. DataReader Data reader is used to retrieve data from a data source in a read-only and forward-only mode.
DataTableCollection It contains all the tables retrieved from vb.met data source. DataRelationCollection It contains relationships and the links between tables in a data set. ExtendedProperties It contains additional information, like the SQL statement for retrieving data, time of retrieval, etc. DataView It represents a fixed customized view of a DataTable for sorting, filtering, searching, editing and navigation. PrimaryKey It represents the column that uniquely identifies a row eith a DataTable.
DataRow It represents a row in the DataTable. DataColumn It consists of the how to get blood circulation in hands of columns that comprise a DataTable.
3. No ports where declared in the IP eg, And instead of Database use Initial Catalog=datos. On the server you would have to set in sql server management the option of allowing remote connections to true, then in windows firewall activate the port used to connect to the sql server. Full idea with the connection string.
In this article you will learn how to connect databases using ADO. NET in VB. Connecting and communication applications with a database is a necessary part of any type of application. We may even say an application that does not communicate with the database is useless.
Applications communicate with a database to retrieve data to the application or to insert, update or delete data. Net is a model provided by the. NET framework that allows us to retrieve, insert, update, or delete data from a database. NET contains the following important parts: Part Description Connection It is used for establishing a connection between database and application. DataSet It contains a copy of the original database tables.
DataAdapter It is used to retrieve data from the database and update DataSet. In the case of inserting, updating, or deleting data, it automatically updates the database while DataSet is updated. DataReader It is used to read or retrieve data from database to application. Ways of Communication using ADO. Provide connection string find it by opening properties of the connected database to created objects by ConnectionString property. Select Dataset and click the Next button. Choose the data connection and click the Next button.
Save the connection and click the Next button. Select data tables from the connected database and click the Finish button. Pass command and connection object via parameters. Create an object of the created DataSet. Invoke SqlDataAdapter. Fill method. Pass DataSet object via parameter. Fill ds. Note: You have to open the connection before the execution of the command and close it after execution.
SqlConnection cn. ExecuteReader cn. Run a while loop having the condition as SqlDataReader. Read values one by one using SqlDataReader. Item method.
Example: Code: Imports System. ExecuteReader DataGridView1. Read DataGridView1. Add DataGridView1. Item 0, i. Item 0 DataGridView1. Item 1, i. Item 1 DataGridView1. Item 2, i. Item 2 DataGridView1. Item 3, i. Item 3 DataGridView1. Item 4, i. Close End Sub End Class. View All. Khanzada Sultan Khan Updated date Nov 03, Now there are the following two ways of communication between the application and the database using parts of ADO.
Imports System. Tables 0 End Sub End Class. Establish a database connection the same as we have done it in the above way of communication. NET VB. Next Recommended Article. Classes And Objects. NET Core. It is used for establishing a connection between database and application. It is used to retrieve data from the database and update DataSet.
It is used to read or retrieve data from database to application.