c# .net core barcode generator

c# .net core barcode generator

c# .net core barcode generator

c# .net core barcode generator

c# .net core barcode generator,
c# .net core barcode generator,

c# .net core barcode generator,
c# .net core barcode generator,
c# .net core barcode generator,

c# .net core barcode generator,
c# .net core barcode generator,
c# .net core barcode generator,
c# .net core barcode generator,
c# .net core barcode generator,
c# .net core barcode generator,
c# .net core barcode generator,
c# .net core barcode generator,
c# .net core barcode generator,
c# .net core barcode generator,
c# .net core barcode generator,
c# .net core barcode generator,
c# .net core barcode generator,
c# .net core barcode generator,
c# .net core barcode generator,

c# .net core barcode generator,
c# .net core barcode generator,
c# .net core barcode generator,
c# .net core barcode generator,
c# .net core barcode generator,
c# .net core barcode generator,
c# .net core barcode generator,
c# .net core barcode generator,
c# .net core barcode generator,
c# .net core barcode generator,
c# .net core barcode generator,
c# .net core barcode generator,
c# .net core barcode generator,
c# .net core barcode generator,
c# .net core barcode generator,
c# .net core barcode generator,
c# .net core barcode generator,
c# .net core barcode generator,
c# .net core barcode generator,
c# .net core barcode generator,
c# .net core barcode generator,
c# .net core barcode generator,
c# .net core barcode generator,
c# .net core barcode generator,
c# .net core barcode generator,
c# .net core barcode generator,
c# .net core barcode generator,
c# .net core barcode generator,
c# .net core barcode generator,
c# .net core barcode generator,
c# .net core barcode generator,
c# .net core barcode generator,
c# .net core barcode generator,
c# .net core barcode generator,
c# .net core barcode generator,
c# .net core barcode generator,
c# .net core barcode generator,
c# .net core barcode generator,
c# .net core barcode generator,
c# .net core barcode generator,
c# .net core barcode generator,
c# .net core barcode generator,
c# .net core barcode generator,
c# .net core barcode generator,
c# .net core barcode generator,
c# .net core barcode generator,
c# .net core barcode generator,
c# .net core barcode generator,
c# .net core barcode generator,

Substitution operators can be hard to understand. To make it easier to see how they work, Listing 7-13 provides some examples. In all of these examples, something happens to the $BLAH variable. You ll see that the result of the given command is different depending on the substitution operator that s used. To make it easier to discuss what happens, I ve added line numbers to the listing. Notice that, when trying this yourself, you should omit the line numbers. Listing 7-13. Using Substitution Operators 1. sander@linux %> echo $BLAH 2. 3. sander@linux %> echo ${BLAH:-variable is empty} 4 variable is empty 5. sander@linux %> echo $BLAH 6. 7. sander@linux %> echo ${BLAH=value} 8. value 9. sander@linux %> echo $BLAH 10. value 11. sander@linux %> BLAH= 12. sander@linux %> echo ${BLAH=value} 13. 14. sander@linux %> echo ${BLAH:=value} 15. value 16. sander@linux %> echo $BLAH 17. value 18. sander@linux %> echo ${BLAH:+sometext} 19. sometext The example of Listing 7-13 starts with the echo $BLAH command, which reads the variable BLAH and shows its current value. Because BLAH doesn t have a value yet, nothing is shown in line 2. Next, a message is defined in line 3 that should be displayed if BLAH is empty. As you can see, the message is displayed in line 4. However, this doesn t assign a value to BLAH, which you see in lines 5 and 6 where the current value of BLAH is asked again. In line 7, BLAH finally gets a value, which is displayed in line 8. The shell remembers the new value of BLAH, which you can see in lines 9 and 10 where the value of BLAH is referred to and displayed. In line 11,

Here is the syntax for a self-join: SELECT <acol1>, <bcol1> FROM <table1> AS a LEFT [OUTER] JOIN <table1> AS b ON a<col1> = b<col2> Listing 4-13 demonstrates how to write a self-join Be sure to type in and execute the code Listing 4-13 Using Self-Join USE AdventureWorks; GO SELECT aEmployeeID AS Employee, aTitle AS EmployeeTitle, bEmployeeID AS ManagerID, bTitle AS ManagerTitle FROM HumanResourcesEmployee AS a LEFT OUTER JOIN HumanResourcesEmployee AS b ON aManagerID = bEmployeeID; Take a look at the results shown in Figure 4-20 Each employee, except for one, has a manager who is also an employee in the same table The table has ManagerID, which is a foreign key pointing back to the EmployeeID Since employee 109 does not have a manager, the query uses LEFT OUTER JOIN.

BLAH is redefined but it gets a null value. The variable still exists; it just has no value here. This is demonstrated when echo ${BLAH=value} is used in line 12; because BLAH has a null value at that moment, no new value is assigned. Next, the construction echo ${BLAH:=value} is used to assign a new value to BLAH. The fact that BLAH really gets a value from this is shown in lines 16 and 17. Finally, the construction in line 18 is used to display sometext if BLAH currently does have a value. Notice that this doesn t change anything to the value that is assigned to BLAH at that moment; sometext just indicates that it has a value and that s all.

public abstract class UserAccountDaoTestHelper extends TestCase { private UserAccountDao dao; private ConfigHelper helper; public void testSaveUserRoles() { final UserAccount account = new UserAccount("testuser3"); final UserRole admin = new UserRole("admin"); account.getRoles().add(admin); dao.create(account); helper.clear(); assertNotNull(account.getId()); assertNotNull(admin.getId());

Be sure to keep track of which table each column is supposed to come from Even though the query uses the same table twice, it has two separate roles..

You ve just seen how substitution operators can be used to do something if a variable does not have a value You can consider them a rather primitive way of handling errors in your script A pattern-matching operator can be used to search for a pattern in a variable and, if that pattern is found, modify the variable This can be very useful because it allows you to define a variable exactly the way you want For example, think of the situation in which a user enters a complete pathname of a file but only the name of the file itself (without the path) is needed in your script The pattern-matching operator is the way to change this Pattern-matching operators allow you to remove part of a variable automatically Listing 7-14 is an example of a script that works with pattern-matching operators Listing 7-14.

final UserAccount retrievedAccount = dao.read(account.getId()); assertNotNull(retrievedAccount); assertNotNull(retrievedAccount.getRoles()); assertEquals(1, retrievedAccount.getRoles().size()); final UserRole retrievedRole = retrievedAccount.getRoles().iterator().next(); assertEquals(admin.getId(), retrievedRole.getId()); } // READ, UPDATE, DELETE public void testReadById() { final UserAccount account = new UserAccount("testuser4"); dao.create(account); helper.clear(); assertNotNull(account.getId()); final UserAccount retrieved = dao.read(account.getId()); assertNotNull(retrieved); assertEquals(account.getId(), retrieved.getId()); assertEquals(account.getAccountName(), retrieved.getAccountName()); } public void testReadByName() { final UserAccount account = new UserAccount("testuser5"); dao.create(account); helper.clear(); assertNotNull(account.getId()); final UserAccount retrieved = dao.read(account.getAccountName()); assertNotNull(retrieved); assertEquals(account.getId(), retrieved.getId()); assertEquals(account.getAccountName(), retrieved.getAccountName()); }

Working with Pattern-Matching Operators #!/bin/bash # # script that extracts the file name from a filename that includes the complete path # usage: stripit <complete file name> filename=${1##*/} echo "The name of the file is $filename" When executed, the script will show the following result: sander@linux %> /stripit /bin/bash the name of the file is bash Pattern-matching operators always try to locate a given string In this case, the string is */ In other words, the pattern-matching operator searches for a /, preceded by another character In this pattern-matching operator, ## is used to search for the longest match of the provided string, starting from the beginning of the string So, the pattern-matching operator searches for the last / that occurs in the string and removes it and everything that precedes the / as well You may ask how the script comes to remove everything in front of the /.