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Explanation in .NET Embed PDF-417 2d barcode in .NET Explanation




How to generate, print barcode using .NET, Java sdk library control with example project source code free download:
Explanation using none tobuild none with asp.net web,windows application Microsoft Office Development. Microsoft Office 2000/2003/2007/2010 1. Constants repre none none senting the values of the SQL standard types are included with the special DBI :sql_types tag. The constants are used by the bind_param method starting on line 10.

. 2. Connection to the MySQL database is made. 3. The RaiseError attribute is turned on to catch exceptions and die if there is one. 4. The AutoCommit attribute is turned off, so that SQL statements are not automatically sent to the database but must be manually committed..

5. A list of of an none none onymous arrays is created to represent the rows that will be inserted into the table..

6. A SQL statement is created to insert new teams later; the values to be substituted for the placeholders..

7. The SQL statement is prepared. A statement bundle is returned. 8. The foreach loop is used to iterate through each of the rows that will be added. 9. The eval block none none is entered. If an error occurred, it will be assigned to the special variable, $@.

See line 11.. 10. The bind_param () method binds the first parameter to the first ( ) placeholder in line 6. The first parameter, $param->[0] is "Tampa Terrors", the first time in the loop.

It is of type SQL_VARCHAR. Next, the second parameter, param->[1] is bound to the second placeholder ( ); the first time through the loop, it represents the number of wins, i.e.

, three, etc.. 11. If one of the statements in the eval block failed, this variable will be set to the error. 12. If there was a n error in the execution of any of the statements in the eval block, all of them will be discarded. The database will be rolled back to its original state.

In other words, if one transaction fails, nothing is done.. 13. If there were no errors, this block is executed, and all of the inserts will happen. 17.7. Using CGI and the DBI to Select and Display Entries Once you have lear none none ned how to connect to a database and submit queries, you may want to use DBI in your CGI scripts to store and retrieve data for dynamic Web pages. In the first example, a simple CGI program demonstrates how to fetch data from the database and then format it as a table to be sent to the user"s browser..

Example 17.45. Code View: 1 #!c:/ none none ActivePerl/bin/perl.exe 2 use DBI; 3 use CGI qw(:standard);. 4 my $dbh = DBI-&g t;connect("DBI:mysql:host=localhost;database=sample_db; user=root;password=quigley1")or die "Connection to sample_db failed: $DBI::errstr"; ; 5 my $sth=$dbh->prepare("SELECT * FROM coaches"); $sth->execute(); 6 print header, start_html(-title=>"Sample Database", -BGCOLOR=>"#66ff33"); print "<div align="center">"; print h2("Contents of the \"coaches\" Table");. print qq/<table none none border="1" cellpadding="10" bgcolor="white">/; while(my @val = $sth->fetchrow_array()){ print <<EOF; <tr> <td>$val[0]</td> <td>$val[1]</td> <td>$val[2]</td> <td>$val[3]</td> <td>$val[4]</td> </tr> EOF } print "</table>"; print end_html(); $sth->finish(); $dbh->disconnect();. Explanation 1. The shbang (pou none for none nd sign, bang line) tells the Web server where Perl is installed so it can start up the Perl interpreter. This line is necessary for any operating system using the Apache server.

. 2. We are going to be using the DBI module in this program to talk to the MySQL database. 3. We will use the none for none function-oriented version of the CGI module to use the standard CGI functions to talk to the Web browser..

4. A connection is make to the MySQL database. 5. A SQL SELECT statement is prepared. It will retrieve all of the records for the coaches table. 6. The CGI header function sets the "Content-type: text/hmtl\n\n" line, and the HTML startup line to set a title and color for the HTML page. This information will be sent through the Common Gateway to the server and onto the browser.

. 7. An HTML table is created to hold the data that will returned from the database. 8. As the data is fetched from the database, it is formatted and sent back to the server, then presented as a table in the browser window..

The second example takes us full circle. Figure 17.21. Client/server from browser to database. [View full size image]. CGI.pm creates a s imple HTML form consisting of a text field. The user will select a team, type the team name into the form, and submit the form.

The CGI program will process the form information, use the DBI module to connect to the MySQL database, retrieve the team"s information, format it, and send it back to the browser as an HTML table.. Figure 17.22. DBI and CGI output. [View full size image]. Example 17.46. Code View: 1 #!c:/ ActivePerl/bin/perl.exe 2 3 use DBI; use CGI qw(:standard); print header, start_html(-title=>"Team Lookup", -BGCOLOR=>"#66ff33" ); print start_form,"<font face="arial" size="+1"> Look up what team ",textfield("name"),p; print submit, end_form, hr; if(param()) { $team = param("name"); $dbh = DBI->connect("DBI:mysql:host=localhost;database=sample_db; user=root;password=quigley1") or print "Connection failed: ". $DBI::errstr; $sth=$dbh->prepare("SELECT name, wins, losses FROM teams where name = " ); $sth->execute($team); if ($sth->rows == 0){ print "Your team isn"t in the table.

<br>"; exit; } print h2("Data for \u$team"); while(($name,$wins,$losses) = $sth->fetchrow_array()){. 4 5 6 7 8. print <<EOF; <table border="1" bgcolor="yellow"> <tr> <th>Name</th> <th>Wins</th> <th>Losses</th> </tr> <tr> <td>$name</td> <td>$wins</td> <td>$losses</td> </tr> </table> EOF print end_html(); $sth->finish(); $dbh->disconnect(); } # End while loop # End if block starting on line 6.
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