Tài liệu Improving DataReader Performance with Column Ordinals ppt

... Recipe 9.7 Improving 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 ... conn.Open( ); // Create the DataReader to retrieve ordinals. SqlDataReader dr = cmd.ExecuteReader(CommandBehavior.SchemaOnly); // Retrieve the column...

Ngày tải lên: 24/12/2013, 05:15

... 9.6 Improving DataReader Performance with Typed Accessors Problem You need to improve performance when accessing data from a DataReader. Solution Use DataReader typed accessors to improve performance ... access the data in a DataReader row using a column name, a column ordinal, or a typed accessor method such as GetInt32( ) and GetString( ). The typed accessor allows...

Ngày tải lên: 24/10/2013, 11:15

... Business Rules with Column Expressions Problem You need to enforce a business rule based on multiple columns in a table at the user interface tier. Solution Use expression-based columns to enforce ... EnforceBusinessRulesWithColumnExpressionsForm_Load( object sender, System.EventArgs e) { DataColumnCollection cols; // Build the table. dt = new DataTable(TABLENAME); cols...

Ngày tải lên: 21/01/2014, 11:20

... LiB ] Recipe 9.4 Improving Paging Performance Problem Given an application that allows the user to page through a large result set in a data grid, you need to improve the performance of the ... Calls the GetData( ) method with the argument PREVIOUS to retrieve the previous page of data from the Orders table. N ext Button.Click Calls the GetData( ) method with the argument...

Ngày tải lên: 26/01/2014, 10:20

... inward, physically or mentally. introvert v. To turn within. intrude v. To come in without leave or license. intrusion n. The act of entering without warrant or invitation; encroachment. intuition ... becloud, especially with or as with drink. muffle v. To deaden the sound of, as by wraps. mulatto n. The offspring of a white person and a black person. 5000 Collegiate Words w...

Ngày tải lên: 21/12/2013, 03:16

... building a system with both AC and DC outputs. If AC is ASIDE: PLC outputs must convert the 5Vdc logic levels on the PLC data bus to exter- nal voltage levels. This can be done with circuits similar ... and appear to be working with a diminished voltage. If DC is connected to an AC triac output it will turn on and appear to work, but you will not be able to turn it off without turnin...

Ngày tải lên: 22/12/2013, 20:16

... addition, a special column called INSTRUMENTS contains a list of musical instruments the musician plays. This special column is a collection (a list of many values held in a single column) .  SONG. ... pseudocolumns are as follows (see Chapter 7):  Hierarchical pseudocolumns CONNECT_BY_{ISLEAF | ISCY- CLE} give an indication of contained child elements in a hierar- chy.  Version query...

Ngày tải lên: 24/12/2013, 12:17

... (starting with Sheryl Crow and ending with James Taylor) appear in Figure 10.17 with a blank space in the SONG_ID and GUESTARTIST_ID. The query could not match any row in the GUESTAPPEARANCE table with ... being a Cartesian product. COLUMN CD FORMAT A24 HEADING "CD" COLUMN TRACK FORMAT 90 HEADING "Track" COLUMN SONG FORMAT A40 HEADING "Song" COLUMN...

Ngày tải lên: 24/12/2013, 12:17

... constraint prohibit- ing a column from being empty within a row. Other than those points, the only thing to note is that DEFAULT clauses have been added to allow for column values with nothing added ... object. A cluster is similar to an IOT where more data than usual is stored with indexes, increasing data access performance. Performance especially improves when the joined tables...

Ngày tải lên: 24/12/2013, 12:17

... the SCS Source service. That's it! We are done with upgrading SCS Source to SP2 and can now install SCS Target 5.2.5 and then upgrade it with service pack 2. You can monitor the state of ... installs Workflow Manager as well. Workflow Manager is seamlessly integrated with DAB and hence it can be opened either from within DAB or as a standalone application. Setting Up Document...

Ngày tải lên: 16/01/2014, 20:21