create barcode using vb.net INTRODUCTION TO SQL, SQL*PLUS, AND SQL DEVELOPER in Java

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INTRODUCTION TO SQL, SQL*PLUS, AND SQL DEVELOPER
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The SQL*Plus commands SAVE, GET, and START can handle full file name specifications, with directory paths. In the absence of a directory path, these commands default to the current directory. In a Microsoft Windows environment, it is relatively simple to define the directory (or folder) in which you want SQL*Plus to start. This is one of the shortcut properties, which you can set in the Start In field of the Properties dialog box, shown in Figure 2-7. Right-click the SQL*Plus icon and select Properties to open this dialog box.
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Figure 2-7. SQL*Plus shortcut properties
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INTRODUCTION TO SQL, SQL*PLUS, AND SQL DEVELOPER
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Through the Properties dialog box, you can also simplify the process to start SQL*Plus by specifying your username and password (such as book/book) in the Target field. In that case, the standard log on dialog will be skipped. However, this is a security risk, because anyone with access to your keyboard for more than two seconds will find out your database name and password.
Tip Under Microsoft Windows, you can also set the SQLPATH Registry setting to define a default search path for all files that cannot be found in the current directory. For example, you could have this Registry setting point to a central directory where you maintain all your generic SQL scripts. Just open the Registry Editor with the REGEDIT command and search for SQLPATH. Under other operating systems, check out the SQLPATH environment variable.
Adjusting SQL*Plus Settings
You can modify the behavior of SQL*Plus in numerous ways, based on SQL*Plus variables or settings. This section provides some simple examples to give you an idea of how this works. 11 covers the topic in more detail. Listing 2-18 demonstrates using the SET command to change some SQL*Plus settings. Listing 2-18. Changing SQL*Plus Settings with the SET Command SQL> set pagesize 22 SQL> set pause "Hit [Enter]... " SQL> set pause on SQL> run 1* select * from courses Hit [Enter]... The effect of changing the PAUSE and PAGESIZE settings as shown in Listing 2-18 is that SQL*Plus now produces screen output per page, in this case, 22 lines at a time. The PAUSE setting is useful if the results of your SQL commands don t fit on your screen.
Tip When using the PAUSE setting, don t just switch it on or off; make sure to specify a prompt string, too. Otherwise, SQL*Plus will just wait until you press the Enter key.
You can display the current values of SQL*Plus settings with the SHOW command, and you can revert to the default behavior with the SET command. Listing 2-19 shows examples of using these commands.
INTRODUCTION TO SQL, SQL*PLUS, AND SQL DEVELOPER
Listing 2-19. Displaying SQL*Plus Settings with the SHOW Command SQL> show pages pagesize 22 SQL> show pause PAUSE is ON and set to "Hit [Enter]... " SQL> set pause off SQL> show pause PAUSE is OFF SQL> Although we are discussing the SQL*Plus tool in this section, there is also another (client toolindependent) way to influence your database session behavior: by using the SQL command ALTER SESSION. With this command, you can set several NLS (National Language Support) session parameters, a selection of which are shown in Table 2-11. Table 2-11. Examples of NLS Session Parameters
Parameter
NLS_DATE_FORMAT NLS_TIME_FORMAT NLS_LANGUAGE NLS_NUMERIC_CHARACTERS NLS_CURRENCY
Description
Default format to display dates Default format to display timestamps The language for SQL*Plus feedback and messages The decimal point and group separator characters The currency symbol
The most important parameter in this list is probably NLS_DATE_FORMAT, because this parameter influences the way date values are interpreted and displayed by your session, which is often a source of confusion. Listing 2-20 shows an example of using the ALTER SESSION command to set some NLS session parameters. Listing 2-20. Changing NLS Parameters with ALTER SESSION SQL> alter session 2 set nls_date_format='dd-mm-yyyy' 3 nls_language=Dutch 4 nls_currency='Eur'; Sessie is gewijzigd. SQL>
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