Podcast
Questions and Answers
What does ADO.NET primarily provide?
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?
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?
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?
Which class is used to represent the mapping between a database table and a DataTable in a DataSet?
What is the role of DataRelation in ADO.NET?
What is the role of DataRelation in ADO.NET?
What type of data can be manipulated by a DataTable in ADO.NET?
What type of data can be manipulated by a DataTable in ADO.NET?
Which component directly manages the execution of commands and data access in ADO.NET?
Which component directly manages the execution of commands and data access in ADO.NET?
What does a DataView allow a developer to do in ADO.NET?
What does a DataView allow a developer to do in ADO.NET?
What is the purpose of the SQL UPDATE command?
What is the purpose of the SQL UPDATE command?
Which SQL statement would you use to insert data into specific columns of a table?
Which SQL statement would you use to insert data into specific columns of a table?
What does the 'WHERE' clause do in an UPDATE statement?
What does the 'WHERE' clause do in an UPDATE statement?
Which method is used to add a parameter with a value in C# SQL commands?
Which method is used to add a parameter with a value in C# SQL commands?
In the context of SQL insertion, what does the statement 'INSERT INTO table_name VALUES(value1, value2, value3)' imply?
In the context of SQL insertion, what does the statement 'INSERT INTO table_name VALUES(value1, value2, value3)' imply?
What is the first step to create a new table in a database?
What is the first step to create a new table in a database?
Which statement correctly describes the purpose of the Update button when creating a table?
Which statement correctly describes the purpose of the Update button when creating a table?
Which command is used to remove a table from a database?
Which command is used to remove a table from a database?
What class is essential for establishing a connection to a database server?
What class is essential for establishing a connection to a database server?
Which property of the SqlConnection class can be assigned to specify the data source?
Which property of the SqlConnection class can be assigned to specify the data source?
What method is called to close a connection and release resources in SqlConnection?
What method is called to close a connection and release resources in SqlConnection?
To read data from a connected database, which object would typically be created?
To read data from a connected database, which object would typically be created?
Which of the following queries correctly creates a database?
Which of the following queries correctly creates a database?
Which namespace includes classes for OLE DB provider support?
Which namespace includes classes for OLE DB provider support?
What is the primary use of SQL Server Management Studio (SSMS)?
What is the primary use of SQL Server Management Studio (SSMS)?
Which class allows access to database connections in ADO.NET?
Which class allows access to database connections in ADO.NET?
In which window can you view a list of tables and stored procedures in Visual Studio?
In which window can you view a list of tables and stored procedures in Visual Studio?
What does the .ldf file contain in relation to SQL databases?
What does the .ldf file contain in relation to SQL databases?
Which namespace provides classes specifically for working with SQL Server data access?
Which namespace provides classes specifically for working with SQL Server data access?
Where can you create a new service-based database in Visual Studio?
Where can you create a new service-based database in Visual Studio?
What type of classes are included in System.Data.ProviderBase?
What type of classes are included in System.Data.ProviderBase?
What is the primary purpose of the 'Server' attribute in a connection string?
What is the primary purpose of the 'Server' attribute in a connection string?
Which attribute can be used interchangeably with 'Initial Catalog' in a connection string?
Which attribute can be used interchangeably with 'Initial Catalog' in a connection string?
What would be a correct way to establish a connection to the local database using the 'Data Source' attribute?
What would be a correct way to establish a connection to the local database using the 'Data Source' attribute?
Which of the following is NOT an accepted value for the 'Trusted_Connection' attribute?
Which of the following is NOT an accepted value for the 'Trusted_Connection' attribute?
What happens if the 'Database' attribute is omitted in a connection string?
What happens if the 'Database' attribute is omitted in a connection string?
In a connection string, which of the following specifies the computer name when using a local installation?
In a connection string, which of the following specifies the computer name when using a local installation?
How can the 'Server' attribute be represented apart from 'Server'?
How can the 'Server' attribute be represented apart from 'Server'?
Which statement about 'Integrated Security' is true in the context of connection strings?
Which statement about 'Integrated Security' is true in the context of connection strings?
What is the primary purpose of the Command object in a DBMS?
What is the primary purpose of the Command object in a DBMS?
Which object is responsible for transferring DataSets between the data source and the caller?
Which object is responsible for transferring DataSets between the data source and the caller?
How does a DataReader access data in a database?
How does a DataReader access data in a database?
Which of the following classes in ADO.NET is used to connect to a database?
Which of the following classes in ADO.NET is used to connect to a database?
What type of access does a DataReader provide?
What type of access does a DataReader provide?
Which of the following classes is NOT used for executing SQL commands in ADO.NET?
Which of the following classes is NOT used for executing SQL commands in ADO.NET?
What is the role of SqlCommandBuilder in ADO.NET?
What is the role of SqlCommandBuilder in ADO.NET?
What must be done when using a DataReader object?
What must be done when using a DataReader object?
Flashcards
ADO.NET
ADO.NET
A framework within the .NET environment that allows retrieval and manipulation of data from relational databases, such as SQL Server, Access, Oracle, and even XML.
Data Provider
Data Provider
A component within ADO.NET responsible for establishing a connection with a specific database, executing queries, and updating data.
Data Provider
Data Provider
A module within ADO.NET designed for working with various database systems. It provides tools for connecting, interacting with, and managing data.
DataSet
DataSet
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DataTable
DataTable
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DataView
DataView
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DataRelation
DataRelation
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DataColumnMapping
DataColumnMapping
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What is the .mdf file format used for?
What is the .mdf file format used for?
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What is updating a database?
What is updating a database?
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What is a database?
What is a database?
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What is a database table?
What is a database table?
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What is T-SQL (Transact-SQL)?
What is T-SQL (Transact-SQL)?
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What is a database connection?
What is a database connection?
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What is a SqlCommand object?
What is a SqlCommand object?
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What is a DataReader object?
What is a DataReader object?
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What is the purpose of the Command object in ADO.NET?
What is the purpose of the Command object in ADO.NET?
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What is the role of the Connection object in ADO.NET?
What is the role of the Connection object in ADO.NET?
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What is the purpose of the DataAdapter object in ADO.NET?
What is the purpose of the DataAdapter object in ADO.NET?
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What is the role of the DataReader object in ADO.NET?
What is the role of the DataReader object in ADO.NET?
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What are the command classes for interacting with different databases in ADO.NET?
What are the command classes for interacting with different databases in ADO.NET?
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What are the connection classes used in ADO.NET for different databases?
What are the connection classes used in ADO.NET for different databases?
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What are the data adapter classes in ADO.NET?
What are the data adapter classes in ADO.NET?
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What are the DataReader classes in ADO.NET?
What are the DataReader classes in ADO.NET?
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Database-specific classes in ADO.NET
Database-specific classes in ADO.NET
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System.Data namespace
System.Data namespace
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System.Data.Common namespace
System.Data.Common namespace
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System.Data.SqlClient namespace
System.Data.SqlClient namespace
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Server Explorer in Visual Studio
Server Explorer in Visual Studio
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MDF (Master Database File)
MDF (Master Database File)
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LDF (Log Database Files)
LDF (Log Database Files)
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SQL Server Management Studio (SSMS)
SQL Server Management Studio (SSMS)
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INSERT INTO
INSERT INTO
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UPDATE
UPDATE
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WHERE clause
WHERE clause
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AddWithValue
AddWithValue
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Server Attribute
Server Attribute
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Database / Initial Catalog Attribute
Database / Initial Catalog Attribute
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Trusted_Connection / Integrated Security Attribute
Trusted_Connection / Integrated Security Attribute
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Server Attribute in Connection String
Server Attribute in Connection String
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Database Attribute in Connection String
Database Attribute in Connection String
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Secure Connection Attribute in Connection String
Secure Connection Attribute in Connection String
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Server Attribute
Server Attribute
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Database Attribute
Database Attribute
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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)
andAddWithValue(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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