Ado.net Data Adapter works as a bridge between a DataSet and data source, using DataAdapter we can fill dataset, datatable etc. DataAdapter is basically a class that represents a set of SQL commands with a database connection property, the fill method is used for updating data source How to use Ado.Net DataAdapter
| Method | Description |
|---|---|
| CloneInternals() | It is used to create a copy of this instance of DataAdapter. |
| Dispose(Boolean) | It is used to release the unmanaged resources used by the DataAdapter. |
| Fill(DataSet) | It is used to add rows in the DataSet to match those in the data source. |
What is ADO DataAdapter in access?
ADO.NET DataAdapter. The DataAdapter works as a bridge between a DataSet and a data source to retrieve data. DataAdapter is a class that represents a set of SQL commands and a database connection. It can be used to fill the DataSet and update the data source.
What is the use of DataAdapter in Java?
The DataAdapter works as a bridge between a DataSet and a data source to retrieve data. DataAdapter is a class that represents a set of SQL commands and a database connection. It can be used to fill the DataSet and update the data source. It is used to initialize a new instance of a DataAdapter class.
What is a DataAdapter in Salesforce?
The DataAdapter works as a bridge between a DataSet and a data source to retrieve data. DataAdapter is a class that represents a set of SQL commands and a database connection.
What are the parameters of dbdataadapter?
DataAdapter Parameters. The DbDataAdapter has four properties that are used to retrieve data from and update data to the data source: the SelectCommand property returns data from the data source; and the InsertCommand , UpdateCommand, and DeleteCommand properties are used to manage changes at the data source.
What do you mean by data Adaptor?
The DataAdapter serves as a bridge between a DataSet and a data source for retrieving and saving data. The DataAdapter provides this bridge by mapping Fill, which changes the data in the DataSet to match the data in the data source, and Update, which changes the data in the data source to match the data in the DataSet.
What is DataSet in ADO.NET with example?
An ADO.NET DataSet contains a collection of zero or more tables represented by DataTable objects. The DataTableCollection contains all the DataTable objects in a DataSet. A DataTable is defined in the System. Data namespace and represents a single table of memory-resident data.
What is SqlDataAdapter in C# with example?
SqlDataAdapter is used in conjunction with SqlConnection and SqlCommand to increase performance when connecting to a SQL Server database. If you are using SQL Server stored procedures to edit or delete data using a DataAdapter , make sure that you do not use SET NOCOUNT ON in the stored procedure definition.
What is DataSet and DataAdapter?
DataSet is mainly used to fetch and hold the records for one or more tables into memory. A DataAdapter is used to populate DataSet from records returned from an SQL statement and also a DataSet can be created in memory and tables and data can be added to it.
What are types of data sets?
They are:Numerical data sets.Bivariate data sets.Multivariate data sets.Categorical data sets.Correlation data sets.
What is difference between DataSet and DataTable?
A DataTable object represents tabular data as an in-memory, tabular cache of rows, columns, and constraints. The DataSet consists of a collection of DataTable objects that you can relate to each other with DataRelation objects.
What is difference between SqlDataReader and SqlDataAdapter?
A SqlDataAdapter is typically used to fill a DataSet or DataTable and so you will have access to the data after your connection has been closed (disconnected access). The SqlDataReader is a fast forward-only and connected cursor which tends to be generally quicker than filling a DataSet/DataTable.
What is the difference between SqlCommand and SqlDataAdapter?
SqlAdapter is used to fill a dataset. SqlCommand can be used for any purpose you have in mind related to Create/Read/Update/Delete operations, stored procedure execution and much more.
What is the purpose SqlDataAdapter?
The SqlDataAdapter is a class that represents a set of SQL commands and a database connection. It can be used to fill the DataSet and update the data source.
What is the difference between ExecuteScalar and ExecuteNonQuery?
Solution 1. ExecuteScalar() only returns the value from the first column of the first row of your query. ExecuteReader() returns an object that can iterate over the entire result set. ExecuteNonQuery() does not return data at all: only the number of rows affected by an insert, update, or delete.
Which is faster DataSet or DataReader?
A great plus about DataSet is that it can be filled using multiple data sources. The DataSet represents a complete set of data among the tables that include related tables, constraints, and relationships. However, this greater functionality comes with performance overhead; therefore, DataSet is slower than DataReader.
Why do we use DataSet?
The purpose of DataSets is to avoid directly communicating with the database using simple SQL statements. The purpose of a DataSet is to act as a cheap local copy of the data you care about so that you do not have to keep on making expensive high-latency calls to the database.
What is difference between DataReader and DataSet?
DataReader provides faster performance, but has read-only and forward-only access. DataSet, on the other hand, is high resource-consuming, but offers more control and a disconnected nature.
What is ADO.NET stands for?
Active Data Objects.NETAlthough ADO.NET stands for Active Data Objects.NET, it's perhaps misnamed because ADO.NET is not an ActiveX/Component Object Model (COM) technology.
What is difference between ADO.NET and ASP NET?
ASP.NET is the compiled language. ASP uses ADO (ActiveX Data Objects) technology to connect and work with databases. ASP.NET uses ADO.NET to connect and work with databases. ASP is partially object-oriented.
What is ADO.NET and its architecture?
ADO.NET uses a multilayer architecture that mainly has a few concepts, for instance Connection, Reader, Command, Adapter and Dataset objects. ADO.NET introduced data providers that are a set of special classes to access a specific database, execute SQL commands and retrieve data.
What is a data adapter?
A DataAdapter is used to retrieve data from a data source and populate tables within a DataSet. The DataAdapter also resolves changes made to the DataSet back to the data source. The DataAdapter uses the Connection object of the .NET Framework data provider to connect to a data source, and it uses Command objects to retrieve data from and resolve changes to the data source.
How does ADO.NET DataReader work?
You can use the ADO.NET DataReader to retrieve a read-only, forward-only stream of data from a database. Results are returned as the query executes, and are stored in the network buffer on the client until you request them using the Read method of the DataRea der. Using the DataReader can increase application performance both by retrieving data as soon as it is available, and (by default) storing only one row at a time in memory, reducing system overhead.
What is a SQLDataAdapter in C#?
The SqlDataAdapter is a class that represents a set of SQL commands and a database connection. It can be used to fill the DataSet and update the data source.
What is SQLDataAdapter selectCommand?
SqlDataAdapter (SqlCommand selectCommand): Initializes a new instance of the SqlDataAdapter class with the specified SqlCommand. Here, the selectCommand can be a Transact-SQL SELECT statement or a stored procedure.
What is update data set?
Update (DataSet): It is used to call the respective INSERT, UPDATE, or DELETE statements.
When is no active connection required to read data?
Once the dataset or data table is filled, then no active connection is required to read the data.
Is SQLDataAdapter inherited?
As you can see in the below image, the SqlDataAdapter class is a sealed class so it cannot be inherited. Again is inherited from DbDataAdapter class and implement the IDbDataAdapter, IDataAdapter and ICloneable interface.
How does Ado.net data adapter work?
Ado.net Data Adapter works as a bridge between a DataSet and data source, using DataAdapter we can fill dataset, datatable etc. DataAdapter is basically a class that represents a set of SQL commands with a database connection property, the fill method is used for updating data source
What is the advantage of using StoredProcedure instead of Select?
Another advantage of using StoredProcedure instead of select statement is, that we can get multiple result set with just one call.
Can you use stored procedure with SQLDataAdapter?
We also can use stored procedure with SqlDataAdapter, in below example you can see how to pass parameter in StoredProcedure using SqlCommand object, finally set SqlDataAdapter Select Command.
Is OleDBDataAdapter inherited from SqlDataAdapter?
Similarly we have OleDbDataAdapter, which is also inherited from same base class like SqlDataAdapter, so from implementation point of view there won’t be much difference between both classes, if you want to work with Oledb client then use OleDbDataAdapter, below is the OleDbDataAdapter class definition
How does DBDataAdapter work?
The DbDataAdapter has four properties that are used to retrieve data from and update data to the data source: the SelectCommand property returns data from the data source; and the InsertCommand , UpdateCommand, and DeleteCommand properties are used to manage changes at the data source. The SelectCommand property must be set before you call the Fill method of the DataAdapter. The InsertCommand, UpdateCommand, or DeleteCommand properties must be set before the Update method of the DataAdapter is called, depending on what changes were made to the data in the DataTable. For example, if rows have been added, the InsertCommand must be set before you call Update. When Update is processing an inserted, updated, or deleted row, the DataAdapter uses the respective Command property to process the action. Current information about the modified row is passed to the Command object through the Parameters collection.
What is the name of the statement that updates a row in a table?
When you update a row at the data source, you call the UPDATE statement, which uses a unique identifier to identify the row in the table to be updated. The unique identifier is typically the value of a primary key field. The UPDATE statement uses parameters that contain both the unique identifier and the columns and values to be updated, as shown in the following Transact-SQL statement.
What happens if parameter name is not supplied?
If a parameter name is not supplied for a parameter, the parameter is given an incremental default name of Parameter N , starting with "Parameter1". We recommend that you avoid the Parameter N naming convention when you supply a parameter name, because the name that you supply might conflict with an existing default parameter name in the ParameterCollection. If the supplied name already exists, an exception is thrown.
What is the ADO.NET class?
The ADO.NET SqlDataReader class in C# is used to read data from the SQL Server database in the most efficient manner. It reads data in the forward-only direction. It means, once it read a record, it will then read the next record, there is no way to go back and read the previous record.
Why is data reader important?
Note: The DataReader object increases the performance of the application as well as reduces the system overheads and the reason for this is, one row at a time is stored in memory.
What is a getdouble int?
GetDouble (int i): It gets the value of the specified column as a double-precision floating-point number. Here, parameter i is the zero-based column ordinal.
What is SQLDataReader?
The SqlDataReader is connection-oriented. It means it requires an open or active connection to the data source while reading the data. The data is available as long as the connection with the database exists. SqlDataReader is read-only. It means it is also not possible to change the data using SqlDataReader.
Can you create a SQLDataReader instance?
You can not create the instance of SqlDataReader using the new keyword. Then the question is how we get or create the instance of SqlDataReader class. In order to create the instance of SqlDataReader class, what you need to do is, call the ExecuteReader method of the SqlCommand object which will return an instance of SqlDataReader class as shown in the below image.
Is SQLDataReader read only?
SqlDataReader is read-only. It means it is also not possible to change the data using SqlDataReader. You also need to open and close the connection explicitly. If you look at the following image, you will see that this class is inherited from DbDataReader class and implements the IDisposable interface.
