Tài liệu Retrieving a Single Value from a Query pdf

... compared to retrieving a single value using an output parameter or using a DataReader, it allows a single value to be returned with the least code and may therefore improve readability and maintainability. ... ExecuteScalar( ) method of the Command object returns a single value from the data source rather than a table or data stream. While the ExecuteScalar( ) met...

Ngày tải lên: 14/12/2013, 18:16

... SqlDataAdapter da = new SqlDataAdapter("SELECT * FROM Orders", ConfigurationSettings.AppSettings["Sql_ConnectString"]); DataTable ordersTable = new DataTable(ORDERS_TABLE); ... method of the DataAdapter returns schema information, it does not include the default values for columns. You want to retrieve the default values of columns in a SQL Server table. Solutio...

Ngày tải lên: 24/12/2013, 05:15

... DataAdapter is created and used to fill the DataTable. The insert command and its parameters are defined for the DataAdapter so that new rows can be added to the data source. An event handler ... Creates a new row in the Categories DataTable using the entered CategoryName and Description values and the automatically generated CategoryID field. The Update( ) method of the DataAdapter .....

Ngày tải lên: 21/01/2014, 11:20

... Data from a Database ! Lab 1.1: Retrieving Data from a Database ! Demonstration: Creating a Details Results Page ! Lab 1.2: Creating a Details Results Page ! Review Data-driven Web sites are ... Demonstration: Tour of the Sample Web Site 8 Retrieving Data from a Database 10 Lab 1.1: Retrieving Data from a Database 22 Demonstration: Creating a Detail Results...

Ngày tải lên: 11/12/2013, 14:15

... Site ! Retrieving Data from a Database ! Lab 1.1: Retrieving Data from a Database ! Demonstration: Creating a Details Results Page ! Lab 1.2: Creating a Details Results Page ! Review Data-driven ... LastName="Smith" A relational database is a collection of related tables from which data can be accessed. To access data in relational databases, you use s...

Ngày tải lên: 21/12/2013, 19:15

... bullet, that delivers the advantage. A great company will have incorporated a set of advantages that all reinforce each other around a basic idea. Wal-Mart, IKEA, and South- west Airlines have unique ... a competitive advantage is like having a gun in a knife fight. This is true, but today most advantages don’t stay relevant and few are sustainable. Advantages are temporary. Increa...

Ngày tải lên: 20/01/2014, 01:20

... were analysed to assess the diversity and abundance of lichens, bryophytes and vas- cular plants in 2004 (45 quadrates from Norway, 80 from Russia and 87 from Finland). In each quadrate, the ... Helmisaari H S., Nieminen T. & Vanha-Majamaa I. 2004. Elemental accumulation in boreal bryophytes, lichens and vascular plants to heavy metal and sulfur deposition in Finland. Sci. Tot...

Ngày tải lên: 17/02/2014, 22:20

... INFORMATION_SCHEMA.TABLES view. It returns data as shown in Table 10-2 . Table 10-2. INFORMATION_SCHEMA.TABLES metadata Column name Data type Description TABLE_CATALOG nvarchar(128) Database name ... TABLE_TYPE = 'BASE TABLE' ORDER BY TABLE_TYPE"; // Retrieve the schema table contents. SqlDataAdapter da = new SqlDataAdapter(getSchemaTableText, ConfigurationSettings....

Ngày tải lên: 24/12/2013, 05:15

... (Washington: Mathe- matical Association of America). Keller, H.B. 1968, Numerical Methods for Two-Point Boundary -Value Problems (Waltham, MA: Blaisdell). 758 Chapter 17. Two Point Boundary Value ... email to trade@cup.cam.ac.uk (outside North America). Now, as far as Newton-Raphson is concerned, we are nearly in business. We want to find a vector value of V that zeros the vector value...

Ngày tải lên: 24/12/2013, 12:16

... increment, start value, maximum value, cycling, and caching can be specified when creating the sequence. Oracle stores the definition of sequences for a database in a single data dictionary table in ... SYSTEM table namespace. As a result, all sequence definitions are always available. A sequence is referenced in SQL statements using the NEXTVAL and CURRVAL keywords. NEXTVAL ge...

Ngày tải lên: 21/01/2014, 11:20