Sqldataadapter

Sqldataadapter

SqlDataAdapter interacts with the DataTable type. Here we see a quick example. We then review important members methods, events and properties on SqlDataAdapter. This is an example of the SqlDataAdapter code. However, DataGridViews are a common usage. Part 1: This creates a new SqlConnection instance. Note that you must include the System. SqlClient namespace in your program. Part 2: We use another using block. The using statements are ideal for disposing of resources, making your programs more efficient and reliable. Part 4: This part is commented out. The DataSource is assigned to the DataTable. C program that uses SqlDataAdapter type using System. Data; using System. SqlClient; using System. Fill is the most important method on the DataAdapter objects. It executes the query and fills the DataAdapter object with the results. There are several events, methods and properties that are used with Fill. OnFillError: This is an event that allows you to listen to when an error occurred when filling the DataTable. LoadOption is an enumeration of the options you can use when the DataAdapter is loaded. You can easily insert or upload with the same query. AcceptChangesDuringUpdate: You code can use the AcceptChanges method when you want to accept all changes made to the row. Here are my notes when researching SqlDataAdapter in my work. Note that Dispose and Finalize aren't really useful with the using-statement. They are included in this section for completeness. They allow you to receive messages when the specified actions occur. These are not covered in depth on this page. But they are useful when you must be alerted to changes. Dispose, Finalize. The Dispose and Finalize methods are available because SqlDataAdapter uses important system resources. You should use it with using. When you use using, you don't need to call these methods. Using Internals.

Dataset c#

Sqldataadapter
Initializes a new instance of the SqlDataAdapter class. The following example creates a SqlDataAdapter and sets some of its properties. This implementation of the SqlDataAdapter constructor sets the SelectCommand property to the value specified in the selectCommand parameter. When SelectCommand or any of the other command properties is assigned to a previously created SqlCommandthe SqlCommand is not cloned. The SelectCommand maintains a reference to the previously created SqlCommand object. A SqlConnection that represents the connection. This implementation of the SqlDataAdapter opens and closes a SqlConnection if it is not already open. This can be useful in an application that must call the Fill method for two or more SqlDataAdapter objects. If the SqlConnection is already open, you must explicitly call Close or Dispose to close it. The connection string. The SqlDataAdapter will create and maintain the connection created with the selectConnectionString parameter. Skip to main content. Contents Exit focus mode. SqlClient Assembly: System. SqlDataAdapter SqlCommand. SqlDataAdapter String, String. Is this page helpful? Yes No. Any additional feedback? Skip Submit.

Dataadapter in c# with stored procedure

Rappresenta un set di comandi dati e una connessione di database usati per riempire l'oggetto DataSet e aggiornare un database SQL Server. Represents a set of data commands and a database connection that are used to fill the DataSet and update a SQL Server database. This class cannot be inherited. Nell'esempio seguente vengono utilizzati SqlCommandSqlDataAdaptere SqlConnection per selezionare i record da un database e popolare un oggetto DataSet con le righe selezionate. DataSet Viene quindi restituito il riempimento. The filled DataSet is then returned. SqlDataAdapter Fornisce questo Bridge per mapping Fillche modifica i dati in DataSet in modo che corrispondano ai dati nell'origine dati e Updateche modifica i dati nell'origine dati in modo che corrispondano ai dati in DataSetusando le istruzioni Transact-SQL appropriate sull'origine dati. The SqlDataAdapter provides this bridge by mapping Fillwhich changes the data in the DataSet to match the data in the data source, and Updatewhich changes the data in the data source to match the data in the DataSetusing the appropriate Transact-SQL statements against the data source. L'aggiornamento viene eseguito in base alle righe. The update is performed on a by-row basis. For every inserted, modified, and deleted row, the Update method determines the type of change that has been performed on it InsertUpdateor Delete. A seconda del tipo di modifica, il Insert modello di Update comando, o Delete viene eseguito per propagare la riga modificata nell'origine dati. Depending on the type of change, the InsertUpdateor Delete command template executes to propagate the modified row to the data source. When the SqlDataAdapter fills a DataSetit creates the necessary tables and columns for the returned data if they do not already exist. However, primary key information is not included in the implicitly created schema unless the MissingSchemaAction property is set to AddWithKey. You may also have the SqlDataAdapter create the schema of the DataSetincluding primary key information, before filling it with data using FillSchema. Per ulteriori informazioni, vedere aggiunta di vincoli esistenti a un set di dati. This causes the rows affected count returned to be zero, which the DataAdapter interprets as a concurrency conflict. In this event, a DBConcurrencyException will be thrown. Per un elenco di questi valori, vedere il SqlDataAdapter costruttore. For a list of these values, see the SqlDataAdapter constructor. InsertCommandDeleteCommand E UpdateCommand sono modelli generici che vengono automaticamente riempiti con singoli valori da ogni riga modificata tramite il meccanismo Parameters. The InsertCommandDeleteCommandand UpdateCommand are generic templates that are automatically filled with individual values from every modified row through the parameters mechanism. For every column that you propagate to the data source on Updatea parameter should be added to the InsertCommandUpdateCommandor DeleteCommand.

Sqldataadapter fill datatable

Adds or refreshes rows in the DataSet to match those in the data source. Adds or refreshes rows in a specified range in the collection of DataTable objects to match those in the data source. Adds or refreshes rows in a specified range in the DataSet to match those in the data source using the DataSet and DataTable names. A DataSet to fill with records and, if necessary, schema. The number of rows successfully added to or refreshed in the DataSet. This does not include rows affected by statements that do not return rows. If the connection is closed before Fill is called, it is opened to retrieve data, then closed. If the connection is open before Fill is called, it remains open. The Fill operation then adds the rows to destination DataTable objects in the DataSetcreating the DataTable objects if they do not already exist. When creating DataTable objects, the Fill operation normally creates only column name metadata. However, if the MissingSchemaAction property is set to AddWithKeyappropriate primary keys and constraints are also created. You must explicitly define the primary key to ensure that duplicate rows are resolved correctly. For more information, see Defining Primary Keys. If the data adapter encounters duplicate columns while populating a DataTableit generates names for the subsequent columns, using the pattern "columnname1", "columnname2", "columnname3", and so on. If the incoming data contains unnamed columns, they are placed in the DataSet according to the pattern "Column1", "Column2", and so on. When multiple result sets are added to the DataSet each result set is placed in a separate table. Additional result sets are named by appending integral values to the specified table name for example, "Table", "Table1", "Table2", and so on. Applications using column and table names should ensure that conflicts with these naming patterns does not occur. You can use the Fill method multiple times on the same DataTable. If a primary key exists, incoming rows are merged with matching rows that already exist. If no primary key exists, incoming rows are appended to the DataTable. When handling batch SQL statements that return multiple results, the implementation of FillSchema for the. A DataTable to fill with records. An instance of IDataReader. The number of rows successfully added to or refreshed in the DataTable. See the remarks for DataAdapter. Fill DataSet for additional information.

Data set class

Sqldataadapter
Represents a set of data commands and a database connection that are used to fill the DataSet and update a SQL Server database. This class cannot be inherited. The filled DataSet is then returned. The SqlDataAdapter provides this bridge by mapping Fillwhich changes the data in the DataSet to match the data in the data source, and Updatewhich changes the data in the data source to match the data in the DataSetusing the appropriate Transact-SQL statements against the data source. The update is performed on a by-row basis. For every inserted, modified, and deleted row, the Update method determines the type of change that has been performed on it InsertUpdateor Delete. Depending on the type of change, the InsertUpdateor Delete command template executes to propagate the modified row to the data source. When the SqlDataAdapter fills a DataSetit creates the necessary tables and columns for the returned data if they do not already exist. However, primary key information is not included in the implicitly created schema unless the MissingSchemaAction property is set to AddWithKey. You may also have the SqlDataAdapter create the schema of the DataSetincluding primary key information, before filling it with data using FillSchema. This causes the rows affected count returned to be zero, which the DataAdapter interprets as a concurrency conflict. In this event, a DBConcurrencyException will be thrown. For a list of these values, see the SqlDataAdapter constructor. The InsertCommandDeleteCommandand UpdateCommand are generic templates that are automatically filled with individual values from every modified row through the parameters mechanism. For every column that you propagate to the data source on Updatea parameter should be added to the InsertCommandUpdateCommandor DeleteCommand. The SourceColumn property of the DbParameter object should be set to the name of the column. This setting indicates that the value of the parameter is not set manually, but is taken from the particular column in the currently processed row. An InvalidOperationException will occur if the Fill method is called and the table contains a user-defined type that is not available on the client computer. Initializes a new instance of the SqlDataAdapter class. The default name used by the DataAdapter object for table mappings.

Data adapter class

The ADO. NET DataSet is a memory-resident representation of data that provides a consistent relational programming model independent of the data source. The DataSet represents a complete set of data that includes tables, constraints, and relationships among the tables. Because the DataSet is independent of the data source, a DataSet can include data local to the application, and data from multiple data sources. Interaction with existing data sources is controlled through the DataAdapter. The SelectCommand property of the DataAdapter is a Command object that retrieves data from the data source. The InsertCommandUpdateCommandand DeleteCommand properties of the DataAdapter are Command objects that manage updates to the data in the data source according to modifications made to the data in the DataSet. Fill takes as its arguments a DataSet to be populated, and a DataTable object, or the name of the DataTable to be filled with the rows returned from the SelectCommand. Using the DataAdapter to retrieve all of a table takes time, especially if there are many rows in the table. This is because accessing the database, locating and processing the data, and then transferring the data to the client is time-consuming. Pulling all of the table to the client also locks all of the rows on the server. To improve performance, you can use the WHERE clause to greatly reduce the number of rows returned to the client. You can also reduce the amount of data returned to the client by only explicitly listing required columns in the SELECT statement. Another good workaround is to retrieve the rows in batches such as several hundred rows at a time and only retrieve the next batch when the client is finished with the current batch. The Fill method uses the DataReader object implicitly to return the column names and types that are used to create the tables in the DataSetand the data to populate the rows of the tables in the DataSet. Tables and columns are only created if they do not already exist; otherwise Fill uses the existing DataSet schema. Column types are created as. Primary keys are not created unless they exist in the data source and DataAdapter. If Fill finds that a primary key exists for a table, it will overwrite data in the DataSet with data from the data source for rows where the primary key column values match those of the row returned from the data source. If no primary key is found, the data is appended to the tables in the DataSet. You must define the PrimaryKey yourself to make sure that duplicate rows are resolved correctly. For more information, see Defining Primary Keys. The code shown in this example does not explicitly open and close the Connection. The Fill method implicitly opens the Connection that the DataAdapter is using if it finds that the connection is not already open. If Fill opened the connection, it also closes the connection when Fill is finished. This can simplify your code when you deal with a single operation such as a Fill or an Update. However, if you are performing multiple operations that require an open connection, you can improve the performance of your application by explicitly calling the Open method of the Connectionperforming the operations against the data source, and then calling the Close method of the Connection. You should try to keep connections to the data source open as briefly as possible to free resources for use by other client applications. If the DataAdapter encounters multiple result sets, it creates multiple tables in the DataSet.

Dataadapter vs datareader

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How to insert data using sqldataadapter c#

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