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Method of updating map

Method of updating map

OutputParameters Only output parameters may be mapped to the changed row in the DataSet. The Update method resolves your changes back to the data source; however other clients may have modified data at the data source since the last time you filled the DataSet. New rows will be added to the table, and updated information will be incorporated into existing rows. The Fill method determines whether a new row will be added or an existing row will be updated by examining the primary key values of the rows in the DataSet and the rows returned by the SelectCommand.

If the Fill method encounters a primary key value for a row in the DataSet that matches a primary key value from a row in the results returned by the SelectCommand, it updates the existing row with the information from the row returned by the SelectCommand and sets the RowState of the existing row to Unchanged.

If a row returned by the SelectCommand has a primary key value that does not match any of the primary key values of the rows in the DataSet, the Fill method adds a new row with a RowState of Unchanged. You must define the PrimaryKey yourself to ensure that duplicate rows are resolved correctly.

For more information, see Defining Primary Keys. To handle exceptions that may occur when calling the Update method, you can use the RowUpdated event to respond to row update errors as they occur see Handling DataAdapter Events , or you can set DataAdapter. ContinueUpdateOnError to true before calling Update, and respond to the error information stored in the RowError property of a particular row when the update is complete see Row Error Information.

If the field values that identify the row as unique have been modified, after calling AcceptChanges the Original values will no longer match the values in the data source. AcceptChanges is called automatically for each row during a call to the Update method of a DataAdapter.

You can preserve the original values during a call to the Update method by first setting the AcceptChangesDuringUpdate property of the DataAdapter to false, or by creating an event handler for the RowUpdated event and setting the Status to SkipCurrentRow.

Example The following examples demonstrate how to perform updates to modified rows by explicitly setting the UpdateCommand of a DataAdapter and calling its Update method.

This is important, because the Current value may have been modified and may not match the value in the data source. The Original value is the value that was used to populate the DataTable from the data source. Update categoryTable ; Console. WriteLine "Rows after update. For more information and an example, see Retrieving Identity or Autonumber Values.

Ordering of Inserts, Updates, and Deletes In many circumstances, the order in which changes made through the DataSet are sent to the data source is important. For example, if a primary key value for an existing row is updated, and a new row has been added with the new primary key value as a foreign key, it is important to process the update before the insert. You can then pass the returned DataRow array to the Update method of the DataAdapter to process the modified rows.

By specifying a subset of rows to be updated, you can control the order in which inserts, updates, and deletes are processed. Example For example, the following code ensures that the deleted rows of the table are processed first, then the updated rows, and then the inserted rows.

Tables "Customers" ' First process deletes. Deleted ' Next process updates. ModifiedCurrent ' Finally, process inserts. Select null, null, DataViewRowState. The sample uses DataAdapter. AcceptChangesDuringFill to clone the data in the database.

If the property is set as false, AcceptChanges is not called when filling the table, and the newly added rows are treated as inserted rows.

So, the sample uses these rows to insert the new rows into the database. The samples uses DataAdapter. TableMappings to define the mapping between the source table and DataTable. When you create a DataTable, you can only write the data from database to the current version or the original version by setting the property as the LoadOption. Upsert or the LoadOption.

The sample will also update the table by using DbDataAdapter. UpdateBatchSize to perform batch operations. Before you compile and run the sample, you need to create the sample database: Get the table Department and Course from the database. Add " Year", SqlDbType. SmallInt, 2 ; parameter. WriteLine "The following tables are from the database. WriteLine "After we changed the tables: SmallInt, 2, "Year" ; insertCommand.

Add " Title", SqlDbType. NVarChar, , "Title" ; insertCommand. Add " Credits", SqlDbType. Int, 4, "Credits" ; insertCommand. The original version of each column's data will not be changed. An exception is thrown otherwise. Update table ; Console. WriteLine "Successfully to update the table. Equals typeof DateTime Console. Equals typeof Decimal Console.

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Method of updating map

OutputParameters Only output parameters may be mapped to the changed row in the DataSet. The Update method resolves your changes back to the data source; however other clients may have modified data at the data source since the last time you filled the DataSet.

New rows will be added to the table, and updated information will be incorporated into existing rows. The Fill method determines whether a new row will be added or an existing row will be updated by examining the primary key values of the rows in the DataSet and the rows returned by the SelectCommand. If the Fill method encounters a primary key value for a row in the DataSet that matches a primary key value from a row in the results returned by the SelectCommand, it updates the existing row with the information from the row returned by the SelectCommand and sets the RowState of the existing row to Unchanged.

If a row returned by the SelectCommand has a primary key value that does not match any of the primary key values of the rows in the DataSet, the Fill method adds a new row with a RowState of Unchanged. You must define the PrimaryKey yourself to ensure that duplicate rows are resolved correctly. For more information, see Defining Primary Keys. To handle exceptions that may occur when calling the Update method, you can use the RowUpdated event to respond to row update errors as they occur see Handling DataAdapter Events , or you can set DataAdapter.

ContinueUpdateOnError to true before calling Update, and respond to the error information stored in the RowError property of a particular row when the update is complete see Row Error Information. If the field values that identify the row as unique have been modified, after calling AcceptChanges the Original values will no longer match the values in the data source.

AcceptChanges is called automatically for each row during a call to the Update method of a DataAdapter. You can preserve the original values during a call to the Update method by first setting the AcceptChangesDuringUpdate property of the DataAdapter to false, or by creating an event handler for the RowUpdated event and setting the Status to SkipCurrentRow.

Example The following examples demonstrate how to perform updates to modified rows by explicitly setting the UpdateCommand of a DataAdapter and calling its Update method. This is important, because the Current value may have been modified and may not match the value in the data source. The Original value is the value that was used to populate the DataTable from the data source. Update categoryTable ; Console. WriteLine "Rows after update. For more information and an example, see Retrieving Identity or Autonumber Values.

Ordering of Inserts, Updates, and Deletes In many circumstances, the order in which changes made through the DataSet are sent to the data source is important. For example, if a primary key value for an existing row is updated, and a new row has been added with the new primary key value as a foreign key, it is important to process the update before the insert. You can then pass the returned DataRow array to the Update method of the DataAdapter to process the modified rows.

By specifying a subset of rows to be updated, you can control the order in which inserts, updates, and deletes are processed. Example For example, the following code ensures that the deleted rows of the table are processed first, then the updated rows, and then the inserted rows.

Tables "Customers" ' First process deletes. Deleted ' Next process updates. ModifiedCurrent ' Finally, process inserts. Select null, null, DataViewRowState.

The sample uses DataAdapter. AcceptChangesDuringFill to clone the data in the database. If the property is set as false, AcceptChanges is not called when filling the table, and the newly added rows are treated as inserted rows.

So, the sample uses these rows to insert the new rows into the database. The samples uses DataAdapter. TableMappings to define the mapping between the source table and DataTable.

When you create a DataTable, you can only write the data from database to the current version or the original version by setting the property as the LoadOption. Upsert or the LoadOption. The sample will also update the table by using DbDataAdapter. UpdateBatchSize to perform batch operations. Before you compile and run the sample, you need to create the sample database: Get the table Department and Course from the database.

Add " Year", SqlDbType. SmallInt, 2 ; parameter. WriteLine "The following tables are from the database. WriteLine "After we changed the tables: SmallInt, 2, "Year" ; insertCommand.

Add " Title", SqlDbType. NVarChar, , "Title" ; insertCommand. Add " Credits", SqlDbType. Int, 4, "Credits" ; insertCommand. The original version of each column's data will not be changed.

An exception is thrown otherwise. Update table ; Console. WriteLine "Successfully to update the table. Equals typeof DateTime Console. Equals typeof Decimal Console.

Method of updating map

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2 Comments

  1. A feed for a partial list contains subset of the entries of the Collection and a link to the next potentially partial list. If this is the case, you may wish to rename your intermediate table accessor to subscription instead of pivot. Get the table Department and Course from the database.

  2. So, you will access those methods as dynamic properties: Model Structure Next, let's examine the model definitions needed to build this relationship: We can define the inverse of a hasOne relationship using the belongsTo method:

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