qr barcode generator vb.net Retrieving CLI query results in Software

Drawing QR Code JIS X 0510 in Software Retrieving CLI query results

Retrieving CLI query results
QR Scanner In None
Using Barcode Control SDK for Software Control to generate, create, read, scan barcode image in Software applications.
Generate QR-Code In None
Using Barcode generation for Software Control to generate, create QR image in Software applications.
19:
Decode QR-Code In None
Using Barcode scanner for Software Control to read, scan read, scan image in Software applications.
Drawing QR Code In Visual C#
Using Barcode generation for VS .NET Control to generate, create QR Code JIS X 0510 image in Visual Studio .NET applications.
SQL APIs
Creating QR Code JIS X 0510 In VS .NET
Using Barcode encoder for ASP.NET Control to generate, create Quick Response Code image in ASP.NET applications.
Draw Denso QR Bar Code In .NET Framework
Using Barcode encoder for VS .NET Control to generate, create Denso QR Bar Code image in .NET framework applications.
/* Fetch the next row of query results */ if (SQLFetch(stmt_hdl) != SQL_SUCCESS) break; /* Display the retrieved data */ printf("Name: %s\n", repname); if (repquota_ind < 0) printf("Quota is NULL\n"); else printf("Quota: %f\n", repquota); printf("Sales: %f\n", repsales); } / * Disconnect, deallocate handles and exit */ SQLDisconnect(conn_hdl); SQLFreeHandle(SQL_HANDLE_STMT, stmt_hdl); SQLFreeHandle(SQL_HANDLE_DBC, conn_hdl); SQLFreeHandle(SQL_HANDLE_ENV, env_hdl); exit();
Painting QR Code In Visual Basic .NET
Using Barcode creator for .NET framework Control to generate, create QR Code image in VS .NET applications.
Generate UCC - 12 In None
Using Barcode printer for Software Control to generate, create USS-128 image in Software applications.
FIGURE 19-24
Creating Data Matrix In None
Using Barcode drawer for Software Control to generate, create Data Matrix image in Software applications.
Painting Barcode In None
Using Barcode generator for Software Control to generate, create bar code image in Software applications.
Retrieving CLI query results (continued)
Barcode Creation In None
Using Barcode drawer for Software Control to generate, create bar code image in Software applications.
Encoding UCC - 12 In None
Using Barcode creation for Software Control to generate, create UPC A image in Software applications.
Each call to SQLBindCol() establishes an association between one column of query results (identified by column number) and an application program buffer (identified by its address). With each call to SQLFetch(), the CLI uses this binding to copy the appropriate data value for the column into the program s buffer area. When appropriate, a second program data area is specified as the indicator-variable buffer for the column. Each call to SQLFetch() sets this program variable to indicate the actual length of the returned data value (for variable-length data) and to indicate when a NULL value is returned. The CLI routines in Figure 19-23 can also be used to implement an alternative method of processing query results. In this technique, the columns of query results are not bound to locations in the application program in advance. Instead, each call to SQLFetch() only advances the cursor to the next row of query results. It does not actually cause retrieval of data into host program data areas. Instead, a call to SQLGetData() is made to actually retrieve the data. One of the parameters of SQLGetData() specifies which column of query results is to be retrieved. The other parameters specify the data type to be returned and the location of the buffer to receive the data and an associated indicator variable value. At the basic level, the SQLGetData()call is simply an alternative to the host-variable binding approach provided by SQLBindCol(), but SQLGetData() provides an important advantage when processing very large data items. Some databases support long binary or character-valued columns that can contain thousands or millions of bytes of data. It s usually impractical to allocate a program buffer to hold all of the data in such a column. Using SQLGetData(), the program can allocate a buffer of reasonable size and work its way through the data a few thousand bytes at a time.
Making Leitcode In None
Using Barcode generator for Software Control to generate, create Leitcode image in Software applications.
Code 128A Creation In Visual Basic .NET
Using Barcode maker for VS .NET Control to generate, create Code 128 Code Set B image in Visual Studio .NET applications.
PART V
Data Matrix Reader In Visual Studio .NET
Using Barcode decoder for .NET framework Control to read, scan read, scan image in .NET applications.
Generate Code 128 Code Set A In Visual C#.NET
Using Barcode drawer for .NET framework Control to generate, create Code 128 Code Set B image in .NET framework applications.
Part V:
Creating EAN 128 In C#.NET
Using Barcode maker for .NET framework Control to generate, create EAN / UCC - 13 image in Visual Studio .NET applications.
EAN-13 Generation In Java
Using Barcode creator for Java Control to generate, create EAN 13 image in Java applications.
Programming with SQL
Read UCC.EAN - 128 In C#.NET
Using Barcode scanner for VS .NET Control to read, scan read, scan image in Visual Studio .NET applications.
Encoding Bar Code In None
Using Barcode maker for Microsoft Word Control to generate, create bar code image in Microsoft Word applications.
It s possible to intermix the SQLBindCol() and SQLGetData() styles to process the query results of a single statement. In this case, the SQLFetch() call actually retrieves the data values for the bound columns (those for which a SQLBindCol() call has been made), but the program must explicitly call SQLGetData() to process the other columns. This technique may be especially appropriate if a query retrieves several columns of typical SQL data (names, dates, money amounts) and a column or two of long data, such as the text of a contract. Note that some CLI implementations severely restrict the ability to intermix the two styles of processing. In particular, some implementations require that all of the bound columns appear first in the left-to-right order of query results, before any columns retrieved using SQLGetData().
Scrolling Cursors
The SQL/CLI standard specifies CLI support for scrolling cursors that parallels the scrolling-cursor support originally included in the SQL standard for embedded SQL. The SQLFetchScroll() call, shown in Figure 19-23, provides the extended FETCH functions needed for forward/backward and random retrieval of query results. One of its parameters specifies the statement handle for the query, just as for the simple SQLFetch() call. The other two parameters specify the direction of FETCH motion (PREVIOUS, NEXT, and so on) and the offset for FETCH motions that require it (absolute and relative random row retrieval). The operation of SQLBindCol() and SQLGetData() for processing returned values is identical to that described for the SQLFetch() call.
Copyright © OnBarcode.com . All rights reserved.