.net barcode reader sdk Visual C++ in VS .NET

Painting European Article Number 13 in VS .NET Visual C++

Visual C++
UPC - 13 Decoder In .NET Framework
Using Barcode Control SDK for .NET Control to generate, create, read, scan barcode image in VS .NET applications.
GS1 - 13 Creator In VS .NET
Using Barcode creation for .NET framework Control to generate, create GTIN - 13 image in .NET framework applications.
int main(int argc, char **argv) { const char *conninfo; PGconn *conn; PGresult *result; char *itemkey, *lastname, *firstname, *finalbid; float floatbid; int i; conninfo = "hostaddr = 127001 dbname = test user = earl password = auction"; conn = PQconnectdb(conninfo); if (PQstatus(conn) != CONNECTION_OK) { printf("Unable to establish connection: %s", PQerrorMessage(conn)); return 1; } else { result = PQexec(conn, "Select * from auctionitemswon"); if (PQresultStatus(result) != PGRES_TUPLES_OK) { printf("Problem with query: %s", PQerrorMessage(conn)); return 1; } else { printf("Item Won by Final Bid\n"); printf("----------------------------\n"); for(i = 0; i < PQntuples(result); i++) { itemkey = PQgetvalue(result, i, 0); lastname = PQgetvalue(result, i, 1); firstname = PQgetvalue(result, i, 2); finalbid = PQgetvalue(result, i, 3); floatbid = atof(finalbid); printf("%s - %s,%s $%2lf\n", itemkey, lastname, firstname, floatbid); } PQclear(result); } } PQfinish(conn); return 0; }
EAN13 Decoder In .NET
Using Barcode reader for Visual Studio .NET Control to read, scan read, scan image in Visual Studio .NET applications.
Printing Bar Code In Visual Studio .NET
Using Barcode generator for Visual Studio .NET Control to generate, create barcode image in VS .NET applications.
The getitemswonc program starts off as usual, connecting to the sample database and using the PQexec() function to send a simple query The number of records in the result set is obtained using the PQntuples() function, and a for loop is started to loop through the result set records
Reading Barcode In .NET
Using Barcode recognizer for Visual Studio .NET Control to read, scan read, scan image in VS .NET applications.
GTIN - 13 Drawer In Visual C#.NET
Using Barcode creator for Visual Studio .NET Control to generate, create GTIN - 13 image in VS .NET applications.
PostgreSQL 8 for Windows
Draw UPC - 13 In .NET Framework
Using Barcode generation for ASP.NET Control to generate, create GS1 - 13 image in ASP.NET applications.
GS1 - 13 Encoder In Visual Basic .NET
Using Barcode maker for .NET framework Control to generate, create European Article Number 13 image in VS .NET applications.
Within the for loop, each iteration is a separate record in the result set For each record, the individual column data values are extracted using the PQgetvalue() function The function references the result set, the record number (controlled by the for loop value), and the individual column number for each data element Of course, this requires that you know what columns are produced by the query, and in what order If you do not know this information, you can use the PQfname() function to find out which column number is which column name Each individual column data value is assigned to a character string variable, since PQexec() returns only string values Since the finalbid column value is a floatingpoint data type, the atof() C function is used to convert the string representation to a floating-point value:
Drawing GS1 RSS In .NET
Using Barcode generation for VS .NET Control to generate, create GS1 DataBar image in VS .NET applications.
Generate Bar Code In Visual Studio .NET
Using Barcode printer for Visual Studio .NET Control to generate, create bar code image in .NET applications.
C:\Program Files\PostgreSQL\82\bin>getitemswon SC001 - Blum,Katie $12000 TR001 - Blum,Rich $340000 RR003 - Blum,Rich $1000 CC023 - Blum,Barbara $1500 C:\Program Files\PostgreSQL\82\bin>
Code 128B Creator In Visual Studio .NET
Using Barcode encoder for VS .NET Control to generate, create Code 128C image in .NET applications.
Make RM4SCC In .NET Framework
Using Barcode drawer for .NET framework Control to generate, create British Royal Mail 4-State Customer Barcode image in .NET framework applications.
Using Parameters
Reading Bar Code In Java
Using Barcode Control SDK for Java Control to generate, create, read, scan barcode image in Java applications.
Code128 Printer In Java
Using Barcode creator for Android Control to generate, create Code 128 image in Android applications.
In many cases, it is necessary to perform multiple queries using the same SQL command but different data elements Instead of having to rewrite each PQexec() command, you can use the PQexecParams() function and use a feature called parameters Parameters allow you to use variables in the place of normal data values in the SQL command Each variable is preceded by a dollar sign ($) and numbered (1 for the first variable, 2 for the second, and so on) An example of using parameters is
Bar Code Scanner In Visual Studio .NET
Using Barcode Control SDK for ASP.NET Control to generate, create, read, scan barcode image in ASP.NET applications.
Code 128B Maker In None
Using Barcode generation for Office Excel Control to generate, create Code 128B image in Microsoft Excel applications.
SELECT * from auctionbidder where lastname = $1 and firstname = $2
Make UPC-A Supplement 5 In None
Using Barcode creator for Online Control to generate, create UPC Symbol image in Online applications.
Drawing GS1-128 In Java
Using Barcode generation for BIRT Control to generate, create GS1 128 image in BIRT reports applications.
Variables can only be used for data values You cannot use a variable for the table or column names The format of the complete PQexecParams() function is
Encode ECC200 In None
Using Barcode maker for Microsoft Excel Control to generate, create Data Matrix ECC200 image in Office Excel applications.
Create Data Matrix In Java
Using Barcode printer for Java Control to generate, create DataMatrix image in Java applications.
PGresult *PQexecParams(Pgconn *conn, const char *command, int nparams, const Oid *paramTypes, const char * const *paramValues, const int *paramLengths, const int *paramFormats, int resultFormat)
As expected, you must declare the values used in the variables within the function After specifying the connection to use and the string command to send, you must define the variable values The first value is nparams, which specifies the number of variables used After that is the paramTypes value This value is an array containing the OID of
14:
Visual C++
each variable type You can also assign this value a NULL value This value forces the PostgreSQL server to use the default data type for the column the data value is used for The next three values specify the variable values (paramValues), their lengths (paramLengths), and the format the variable is specified in (paramFormats) Each of these values is an array The first element in the array references variable $1, the second variable $2, and so on The format value of each variable can be either text mode (0) or binary mode (1) If the value is NULL, PostgreSQL assumes all of the variables are in text mode If the format of the variable is text mode, PostgreSQL assumes the variable is specified as a text (or character) data type and converts the variable value to the data type required for the SQL command specified Thus, you can specify an integer or floating-point value as a text string and set the format value to 0, and PostgreSQL automatically does the conversion for you If you use text mode for variables, you can also set the length value to NULL, as PostgreSQL automatically determines the length of the text string variable Alternatively, if you set the value format type to binary mode (1), you must specify the variable values using the appropriate data type (such as float or int) and specify the length as the byte length of the value The result format value (resultFormat) is also interesting It allows you to set the data type of the result value It can be either text mode (0) or binary mode (1) In text mode, the result set is returned as text values, just as with the PQexec() function The appropriate data type conversion must be performed for binary values In binary mode, the result set data is returned in the appropriate binary format, either integer or floating point At this time, the result format value can only be one or the other; you cannot mix and match text and binary mode data elements Setting the PQexecParams() function can be confusing For beginners, the easiest thing to do is set both the input and output formats as text mode This cuts down on the amount of information you must collect and pass to the function The bidderresultc program demonstrates using parameters with text mode for both input and output data values:
#include #include #include #include <stdioh> <stdlibh> <sys/typesh> "libpq-feh"
int main(int argc, char **argv) { const char *conninfo; PGconn *conn; PGresult *result; char *paramValues[1]; const char *query; char bidder[4]; char *item, *desc, *strbid; float bid, totalbid; int i;
Copyright © OnBarcode.com . All rights reserved.