Tài liệu Enforcing Business Rules with Column Expressions docx

... [ Team LiB ] Recipe 6.7 Enforcing Business Rules with Column Expressions Problem You need to enforce a business rule based on multiple columns in a table at the user interface ... EnforceBusinessRulesWithColumnExpressionsForm_Load( object sender, System.EventArgs e) { DataColumnCollection cols; // Build the table. dt = new DataTable(TABLENAME); cols = dt.Colum...

Ngày tải lên: 21/01/2014, 11:20

... DataReader Performance with Column Ordinals Problem You want to use column ordinals rather than column names to retrieve data from a DataReader to improve application performance and without hard-coding ... provider-specific, nonspecific with null check, and provider-specific with null check. The C# code is shown in Example 9-11 . Example 9-11. File: DataReaderColumnOrdinal...

Ngày tải lên: 24/12/2013, 05:15

... in a business. However, in today's business world, rapid growth, acquisitions, and mergers lead to multiple source systems and different ways of representing information within most businesses. ... tables. 12. Click Mappings. 13. Drag and drop each input column onto the corresponding destination column. The TerritoryID input column is mapped to the business key, not to the Sale...

Ngày tải lên: 13/02/2014, 16:20

... "'."); else for(int i = 0; i < ds.Tables[0].Columns.Count; i++) { result.Append(ds.Tables[0].Columns[i].ColumnName + " = " + ds.Tables[0].Rows[0][i] + Environment.NewLine); ... DataSet. A result queue is created if necessary and a message labeled with the CustomerID and containing the DataSet with the asynchronous query results is sent to the que...

Ngày tải lên: 14/12/2013, 18:16

... 297 14 Expressions 301 14.1 Types of Expressions 302 14.2 Regular Expressions 305 14.2.1 Regular Expression Functions 305 14.2.2 Regular Expression Patterns 306 14.2.3 Using Regular Expressions ... hierarchical queries, version flashbacks, and parallel queries. Chapter 14. Expressions There are many types of simple expressions. Expressions are an integral part of many aspec...

Ngày tải lên: 24/12/2013, 12:17

... multiple col- umns. General syntax for DISTINCT is as follows. SELECT DISTINCT column [, column ] SELECT DISTINCT (column [, column ]) SELECT [ DISTINCT | ALL ] expression Let’s look at some examples ... SELECT . List all the columns you want to see in your report here. Separate them with commas. Use an asterisk (*) instead of a list of columns to automatically show all columns...

Ngày tải lên: 24/12/2013, 12:17

... watermark. 134 7.4 Pseudocolumns 7.4 Pseudocolumns Pseudocolumns are virtual columns or expression calculators, the expression being a constant or another expression. To use a pseudocolumn, you simply name ... USER, and UID are not pseudocolumns but built-in functions. Table 7.1 lists available pseudocolumns. Table 7.1 Pseudocolumns in Oracle Database. Classification Pseudocolumn Purpose ROWI...

Ngày tải lên: 24/12/2013, 12:17

... 197 Chapter 9 from the beginning of the NAME column, up to the space character. The first two columns in the query are included to show the values being worked with, helping understand what the combination ... REPLACE will replace every occurrence of the search string with the replacement string. Where the REPLACE function matches any search string within the string, TRANSLATE will match e...

Ngày tải lên: 24/12/2013, 12:17

... STUDIOTIME_ID.  When both tables contain a row with matching STUDIOTIME_ID, three columns in the HISTORY_STUDIOTIME table are updated with values from columns in the STUDIOTIME table.  When only ... data is to use subqueries. For example, let’s say you want to update ARTIST_COUNTRY column values in TEST- MUSICCD with data from the ARTIST table. You can use a correlated subquery to m...

Ngày tải lên: 24/12/2013, 12:17

... source cube, you must follow some simple rules to obtain logical results. Delivery Tips Explain the preceding illustration by comparing two cubes with different dimensionality. Combining ... corresponding interfaces. Encourage students to follow along with your demonstration on their computers. Tip Module 12: Working with Virtual Cubes 7 BETA MATERIALS FOR MICROSO...

Ngày tải lên: 18/01/2014, 05:20