How visual in Visual C #. The selection of different records for implementing a dataset in net
From: Microsoft knowledge Base article–326176, address: http://support.microsoft.com/default.aspx?scid=kb; en-us;326176
Summary:
This is a basic, simple article that illustrates how to implement and how to use a DataSetHelper class that uses concise code to create a new DataTable object that is unique to the value of a column specified by a DataTable objec
Label: /*Updating a database table in a dataset * Note: When updating a database table with a dataset, the table must specify a primary key or a unique column*/
stringConnString ="Data source= (local); Initial catalog=linq;integrated Security=sspi";//log in with a Windows user
using(SqlConnection conn =NewSqlConnection (connstring)) {Conn.
Open (); using(SqlCommand cmd =Conn. CreateCommand ()) {Cmd.com
ADO. NET is the generic name for class libraries used to operate databases in the. NET Framework SDK. The dataset class is one of the core members of ADO. NET and also a variety of development based on. NET platforms.ProgramThe class most commonly used by language development database applications. The dataset class is in ADO. net has a special position because dataset
ArticleDirectory
Overview and structure of spry main and detailed regions
Overview and structure of spry main and detailed regions
With the spry dataset, you can create primary and detailed dynamic regions to display detailed data. One region (primary) controls the data display of another region (detail.
A.
Master Region
(Main region)
B.
Detail region (detailed Regio
This article mainly introduces the use of Datatable,dataset, attribute summary type, so only throw emphasis. About Datatable,dataset Here is a brief description: The DataSet is a dataset, it can contain a DataTable, and the relationships between the data tables, the DataTable is a datasheet, a column of columns, rows,
database.
In Server Explorer, expand the Northwind data connection until you can see all the tables.
Creating data Adapters and connections
This step creates connections and data adapters that are used to connect and exchange data between applications and data sources.
Creating data Adapters and connections
Drag the Customers table from the Server Explorer (Server Explorer) onto the form. The connection and data adapters are displayed in the component tray.
Select Connection (Connect) and set
Public JsonResult Test () {JsonResult json = new JsonResult {Data = new {Name = "zzl", Sex = "male" ,}}; return Json (json );} public JsonResult TestList () {List
method of List 2, you can also achieve this in a simpler way:
Public JsonResult TestList () {List
Var arr = [{"name": "zzl", "sex": "male" },{ "name": "lr", "sex ": "female"}]; for (var I = 0; I
DataSet is a method used to connect to SQL. It means that a copy of the database tutorial is
How to use the data adapter SqlDataAdapter to retrieve data from the database SQL Server and populate it with the dataset:Methods to get data sets
Private DataSet GetDataSet (){String Strcon = @ "Data source=./sqlexpress;initial catalog=school;uie=sa;pwd=123456";SqlConnection con = new SqlConnection (Strcon);String sql = "SELECT * from student";DataSet ds = new DataSet
xml| conversion Everyone knows that webservice, which is passed in a dataset, will not be compatible with J2ee,flash, so I find a way to convert them into normal XML. The code is as follows:
Method One:
Public Class datasettoxml:inherits System.Web.UI.Page
Private Sub Page_Load (ByVal sender as System.Object, ByVal e as System.EventArgs) Handles MyBase.Load
Dim objconn as SqlConnection
Dim strSQL as String
strSQL = "SELECT top * from Customers"
obj
Difference between DataRead and DataSet: datareaddatasetDifference between DataRead and DataSet
Dataset indicates a dataset, which is cached in memory. Can contain multiple tablesDatSet is non-connection-oriented when connecting to the database. Read all tables to the SQL Buffer Pool and disconnect from the database.
D
Dataset is a method used to connect to SQL. It means to store database copies in an application. When an application starts running, it saves database-related data to dataset.
Datatable indicates a table with data in memory. You can use view to obtain a custom view of a table that may include a filtering view or a cursor position.
The datareader object is the simplest way to read the database. It can only r
[Open source code and dataset] scene Word detection and recognition (from Mclab) [Open source code and dataset] scene Word detection and recognition (from Mclab)
End to end scene text recognition M. Liao, B. Shi, x. Bai, X. Wang, W. Liu. TEXTBOXES:A Fast text detector with A single deep neural network.In:proceedings of the 31st AAAI Conference on Artificial Intelligence (AAAI '), San Francisco, California,
oracle| Stored Procedures | data
Selected from CSDN http://search.csdn.net/Expert/topic/2280/2280860.xml?temp=2.169436E-02 forum JCC0128 Netizen's speech
Delphi+oracle Report Solution (i) Delphi stored procedures that invoke Oracle (striped return cursors, no value two)
Keywords: delphi, Oracle Stored procedures, cursors, return data sets, reports
Note: Delphi 6+ Oracle 8.1.6
I. Create package and package body
1. Attach: Build table Aaclass for the following test
CREATE TABLE Aaclass (CID V
5.2 implement complex data query using LINQ to DatasetLINQ to dataset integrates LINQ with ADO. net. It obtains data through ADO. NET and then queries data through LINQ, so as to perform complex queries on the dataset. This section describes how to use LINQ to dataset to operate data in a dataset.
5.2.1 use LINQ to Dat
Data
(i). Description
There is a problem with programming: Occasionally, for some reason, a database table needs to be changed to a field name. For example: change: Name to: PersonName.
The programmer then turns on all the code involved and finds something similar: DS. Table[0]. row[n][the statement "Name", modified to: DS. Table[0]. row[n]["Name"].
In fact, there is no need to do so, just add a structure with a dataset on the OK. Modifying only one
Ado
New features of Ado.net 2.0 dataset and DataTable
1. Faster execution efficiency of the new indexing engineThe following code takes 157 seconds in 2003 and can be completed in 2005 in 11 seconds:
DataSet ds = new DataSet ();
Ds. Tables.add ("BigTable");Ds. Tables[0]. Columns.Add ("ID", Type.GetType ("System.Int32"));Ds. Tables[0]. columns["ID"]. Unique = true
SqlConnection database Connection object: Only joins for other operations SqlDataAdapter data adapter object, which is to execute a query statement (SELECT statement) with a certain SqlConnection, and put it in a dataset SqlCommand data Command object (select,insert,delete,update, etc.) sqlcommand.parameter attribute pass SQL parameter executescalar: Executes the query, returns a single field, For example, the sum of the results, average, the maximum
DataSetRepresents the cache of data in memory.
PropertyTables gets a collection of tables that are contained in the DataSet.
Ds. tables["SJXX"]
DataTable
Represents a table of data in memory.
Public propertiesColumns gets the collection of columns that belong to the table.
The dataset obtains the dataset to which this table belongs.
DefaultView gets a cu
XML this time to write the project every time to use XML to save some configuration, and each operation of XML is very cumbersome, no database so smooth. It was later discovered that using a dataset to manipulate XML was convenient and flexible, so it wrote a class that manipulated XML to deal with general XML operations (source download attachments).
1 Basic IdeasIn fact, using dataset to manipulate XML, i
Check for changes with the HasChanges method.
First use the HasChanges method to detect the affected rows (return bool)
if (!mydataset.haschanges (datarowstate.modified)) return;
To create a temporary dataset
DataSet Xdataset;
Using the GetChanges method of the dataset to get the affected rows
Xdataset = Mydataset.getchanges (datarowstate.modified);
detecting
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