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Generate PDF417 and barcodes in Crystal Reports without installing other components. Supports PDF417, MOD43 and multiple narrow to wide ratios.

crystal reports pdf 417

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exec sql open qrycurs; exec sql whenever not found goto no_more_data; for ( ; ; ) { /* Fetch the row of data into our buffers */ exec sql fetch sqlcurs using descriptor qry_da; printf("\n"); /* Loop printing data for each column of the row */ for (i = 0; i < colcount; i++) { /* Find the SQLVAR for this column; print column label */ qry_var = qry_da->sqlvar + i; printf(" Column # %d (%s): ", i+1, qry_var->sqlname); /* Check indicator variable for NULL indication */ if (*(qry_var -> sqlind)) != 0) { puts("is NULL!\n"); continue; } /* Actual data returned; handle each type separately */ switch (qry_var -> sqltype) { case 448: case 449: /* VARCHAR data - just display it */ puts(qry_var -> sqldata); break; case 496: case 497: /* Four-byte integer data - convert & display it */ printf("%ld", *((int *) (qry_var->sqldata))); break; case 500: case 501: /* Two-byte integer data - convert & dispay it */ printf("%d", *((short *)(qry_var->sqldata))); break; case 480: case 481: /* Floating-point data - convert & display it */

crystal reports pdf 417

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The software includes a file called U25MoroviaPDF417FontEncoder4.dll , which is specially crafted to provide Crystal Reports with PDF417 encoding functions.

crystal reports pdf 417

Print and generate PDF-417 barcode in Crystal Reports using C# ...
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Figure 18-9.

Data retrieval with dynamic SQL (continued)

The Oracle, MySQL, and Microsoft SQL Server optimizers all respond to hints, but the syntax accepted by each is different Temporary tables may help Temporary tables can help in some situations, such as assembling large result sets and then adding an index or two to support multiple subsequent queries against the temporary table However, remember that you re doubling up the reads and writes when you do this because all the data selected from the original (base) tables must be written to the temporary table(s) and then read back from there In short, there are no free lunches Views may help Views can help because they hide complex operations such as nested aggregate functions.

18:

Dynamic SQL *

crystal reports pdf 417

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crystal reports pdf 417

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printf("%lf", *((double *)(qry_var->sqldat))); break; } } } no_more_data: printf("\nEnd of data.\n"); /* Clean up allocated storage */ for (i = 0; i < colcount; i++) { qry_var = qry_da->sqlvar + i; free(qry_var->sqldata); free(qry_var->sqlind); } free(qry_da); close qrycurs; exit(); }

Figure 18-9.

And with DBMSs that don t have an SQL statement cache, views may process more ef ciently than ordinary queries because the SQL statement that de nes the view has already been parsed and optimized, which means this work does not have to be done every time the view is accessed But above all, remember that views are also SQL queries, so they are subject to all the tuning considerations you apply to any SQL statement..

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Data retrieval with dynamic SQL (continued)

crystal reports pdf 417

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The program in the figure begins by prompting the user for the table name and then queries the system catalog to discover the names of the columns in that table. It asks the user to select the column(s) to be retrieved and constructs a dynamic SELECT statement based on the user s responses. The step-by-step mechanical construction of a select list in this example is very typical of database front-end programs that generate dynamic SQL. In real applications, the generated select list might include expressions or aggregate functions, and there might be additional program logic to generate GROUP BY, HAVING, and ORDER BY clauses. A graphical user interface would also be used instead of the primitive user prompting in the sample program. However, the programming steps and concepts remain the same. Notice that the generated SELECT statement is identical to the interactive SELECT statement that you would use to perform the requested query. The handling of the PREPARE and DESCRIBE statements and the method of allocating storage for the retrieved data in this program are also typical of dynamic query programs. Note how the program uses the column descriptions placed in the SQLVAR array to allocate a data storage block of the proper size for each column. This program also allocates space for an indicator variable for each column. The program places the address of the data block and indicator variable back into the SQLVAR structure.

crystal reports pdf 417

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Generate PDF-417 in Crystal Report for .NET with control library.

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