ADO.NET Components Overview
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What does ADO.NET primarily provide?

  • A framework for database management systems
  • A library for retrieving and updating relational databases (correct)
  • A web interface for data retrieval
  • A basis for cloud storage data solutions

    • Which of the following is NOT a data provider supported by ADO.NET?

  • Data Provider for MongoDB (correct)
  • Data Provider for OLE DB
  • Data Provider for SQL Server
  • Data Provider for Oracle

    • What is the main purpose of the DataSet component in ADO.NET?

  • To execute database commands and queries
  • To serve as a local copy of related data tables (correct)
  • To provide a direct connection to a database
  • To manipulate raw binary data

    • Which class is used to represent the mapping between a database table and a DataTable in a DataSet?

    <p>DataColumnMapping</p> Signup and view all the answers

    What is the role of DataRelation in ADO.NET?

    <p>To link two DataTable classes within a DataSet</p> Signup and view all the answers

    What type of data can be manipulated by a DataTable in ADO.NET?

    <p>Data of any type with related rows</p> Signup and view all the answers

    Which component directly manages the execution of commands and data access in ADO.NET?

    <p>Data Provider</p> Signup and view all the answers

    What does a DataView allow a developer to do in ADO.NET?

    <p>Customize the view of rows in a DataTable</p> Signup and view all the answers

    What is the purpose of the SQL UPDATE command?

    <p>To modify or update existing records.</p> Signup and view all the answers

    Which SQL statement would you use to insert data into specific columns of a table?

    <p>INSERT INTO table_name (column1, column2) VALUES(value1, value2);</p> Signup and view all the answers

    What does the 'WHERE' clause do in an UPDATE statement?

    <p>It determines the records to be updated.</p> Signup and view all the answers

    Which method is used to add a parameter with a value in C# SQL commands?

    <p>AddWithValue()</p> Signup and view all the answers

    In the context of SQL insertion, what does the statement 'INSERT INTO table_name VALUES(value1, value2, value3)' imply?

    <p>Values will be inserted regardless of column definitions.</p> Signup and view all the answers

    What is the first step to create a new table in a database?

    <p>Right-clicking the Tables folder in Server Explorer.</p> Signup and view all the answers

    Which statement correctly describes the purpose of the Update button when creating a table?

    <p>To preview the changes before confirming updates to the database.</p> Signup and view all the answers

    Which command is used to remove a table from a database?

    <p>DROP TABLE table_name;</p> Signup and view all the answers

    What class is essential for establishing a connection to a database server?

    <p>SqlConnection</p> Signup and view all the answers

    Which property of the SqlConnection class can be assigned to specify the data source?

    <p>ConnectionString</p> Signup and view all the answers

    What method is called to close a connection and release resources in SqlConnection?

    <p>Close()</p> Signup and view all the answers

    To read data from a connected database, which object would typically be created?

    <p>DataReader</p> Signup and view all the answers

    Which of the following queries correctly creates a database?

    <p>CREATE DATABASE database_name;</p> Signup and view all the answers

    Which namespace includes classes for OLE DB provider support?

    <p>System.Data.OleDb</p> Signup and view all the answers

    What is the primary use of SQL Server Management Studio (SSMS)?

    <p>To monitor and upgrade data-tier components.</p> Signup and view all the answers

    Which class allows access to database connections in ADO.NET?

    <p>System.Data.Common</p> Signup and view all the answers

    In which window can you view a list of tables and stored procedures in Visual Studio?

    <p>Server Explorer</p> Signup and view all the answers

    What does the .ldf file contain in relation to SQL databases?

    <p>Logs for each transaction.</p> Signup and view all the answers

    Which namespace provides classes specifically for working with SQL Server data access?

    <p>System.Data.SqlClient</p> Signup and view all the answers

    Where can you create a new service-based database in Visual Studio?

    <p>By right-clicking the project file in Solution Explorer.</p> Signup and view all the answers

    What type of classes are included in System.Data.ProviderBase?

    <p>Base classes and connection factory classes.</p> Signup and view all the answers

    What is the primary purpose of the 'Server' attribute in a connection string?

    <p>To indicate the location of the database server</p> Signup and view all the answers

    Which attribute can be used interchangeably with 'Initial Catalog' in a connection string?

    <p>Database</p> Signup and view all the answers

    What would be a correct way to establish a connection to the local database using the 'Data Source' attribute?

    <p>SqlConnection conn = new SqlConnection('Data Source=(local);');</p> Signup and view all the answers

    Which of the following is NOT an accepted value for the 'Trusted_Connection' attribute?

    <p>enable</p> Signup and view all the answers

    What happens if the 'Database' attribute is omitted in a connection string?

    <p>The connection can still be established without attaching to a specific database.</p> Signup and view all the answers

    In a connection string, which of the following specifies the computer name when using a local installation?

    <p>(local)</p> Signup and view all the answers

    How can the 'Server' attribute be represented apart from 'Server'?

    <p>Data Source</p> Signup and view all the answers

    Which statement about 'Integrated Security' is true in the context of connection strings?

    <p>It specifies whether to use Windows Authentication.</p> Signup and view all the answers

    What is the primary purpose of the Command object in a DBMS?

    <p>To run SQL commands and perform stored procedures</p> Signup and view all the answers

    Which object is responsible for transferring DataSets between the data source and the caller?

    <p>DataAdapter</p> Signup and view all the answers

    How does a DataReader access data in a database?

    <p>Through a forward-only, read-only server-side cursor</p> Signup and view all the answers

    Which of the following classes in ADO.NET is used to connect to a database?

    <p>SqlConnection</p> Signup and view all the answers

    What type of access does a DataReader provide?

    <p>Forward-only, read-only access to data</p> Signup and view all the answers

    Which of the following classes is NOT used for executing SQL commands in ADO.NET?

    <p>SqlTransaction</p> Signup and view all the answers

    What is the role of SqlCommandBuilder in ADO.NET?

    <p>To generate SQL commands for updating database tables</p> Signup and view all the answers

    What must be done when using a DataReader object?

    <p>The connection must be closed after use</p> Signup and view all the answers

    Study Notes

    ADO.NET Components

    • ADO.NET stands for "Active Data Objects" and is a framework for accessing and updating data in various relational databases (e.g., SQL Server, Access, Oracle, XML).
    • It uses .NET Framework classes to handle requests and interactions between the database and the user.
    • ADO.NET has two main components: Data Providers and DataSets.

    Data Providers

    • Used for connecting to a database, retrieving results, updating data, and executing commands.
    • Different database systems have distinct data providers.
    • .NET Framework currently supports five data providers:
      • SQL Server
      • OLE DB
      • ODBC
      • Oracle
      • EntityClient

    DataSets

    • A local copy of related data tables that can be manipulated and updated by users.
    • Consists of one or more DataTable objects.
    • Manages data for entities
    • Includes data rows, columns, primary and foreign keys, constraints, and relationships between tables.
    • Has various elements for managing data:
      • DataColumn: Declares the type of data stored in a column.
      • DataRelation: Links two DataTables within a DataSet.
      • DataColumnMapping: Maps table names from the database to DataTables in a DataSet.
      • DataView: Customizes the view of data in a DataTable.
    • Uses various components including:
      • Command: Runs SQL commands, stored procedures to fetch and manipulate data.
      • Connection: Establishes connections to data sources.
      • DataAdapters: Transfer DataSets between a data source and caller, acting as a connection bridge.
      • DataReaders: Provide read-only access to data using a server-side cursor.

    Database Classes

    • Wrappers for SQL statements and stored procedures.
    • Generate SQL commands for database operations (e.g., updates, select statements).
    • Handle interactions between DataSets and data sources.
    • Used for handling different SQL commands and updating/populating DataSets.
    • Provide functionalities for database-related operations.
      • SqlCommand, OleDbCommand, ODBCCommand
      • SqlTransaction, OleDbTransaction, ODBCTransaction

    Creating a Database

    • Database creation via Server Explorer for managing server connections.
    • Data Connections: List of database connections.
    • SQL Server Object Explorer: Design, browse schema, and build queries.
    • SQL Server Management Studio (SSMS) for managing SQL infrastructure (queries, scripts).
    • Database Creation (Local): Add New Item (Service-Based Database). Results in .MDF (data) and .LDF (transaction logs), making the database recoverable.

    Data Access

    • Connecting to a database involves creating a Connection object to the data source.
    • Other steps include opening the connection, creating a command, using a DataReader or DataAdapter, and closing the connection, freeing resources.

    Connection String Attributes

    • Server: Specifies the computer where the database resides.
    • Database/Initial Catalog: Specifies the name of the database.
    • Trusted Connections/Integrated Security: Allows secure connections without explicit username and password.
    • UserName and Password: Used when Integrated Security is disabled.

    SqlCommand

    • Used for performing various database operations.
    • Methods (e.g., ExecuteNonQuery, ExecuteReader, ExecuteScalar, ExecuteRow) for different types of operations.
    • Properties like Connection, CommandText, CommandType to manage and execute commands.

    SqlParameterCollection

    • Manages parameters used for queries or commands.
    • Adds parameters using methods like Add(string paramterName, SqlDbtype sqlDbType) and AddWithValue(string parameterName, object value).

    Updating a Table

    • Updates existing records in a table using UPDATE command.
    • Uses WHERE clause to specify conditions.

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    Related Documents

    IT1811 Database Programming PDF

    Description

    Explore the key components of ADO.NET, including Data Providers and DataSets. This quiz will cover their functionalities, uses, and how they interact with relational databases. Test your knowledge on how these components work in the .NET framework.

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