create barcode using vb.net Introduction to SQL*Plus in Java

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2.3 Introduction to SQL*Plus
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SQL*Plus is a tool used to enter SQL commands and display the output. It is provided with every Oracle installation, whether on Windows or Unix. It is a command line interface and supports editing, user input, and report formatting.
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Note In 11g, SQL*Plus for Windows (sqlplusw.exe) is no longer part of the client or database install. The command line version (sqlplus.exe) is still available. You can use an older version of SQL*Plus for Windows to connect to an 11g database, but some functionality may not be supported. SQL Developer, which we will cover later in this chapter, is a GUI interface that is shipped with 11g and should be considered the replacement for SQL*Plus for Windows.
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To start SQL*Plus, simply type sqlplus at the command prompt or after starting a DOS command session in Windows. Under normal circumstances, SQL*Plus prompts you for a username and corresponding password. If you are able to provide a valid username/password combination, the SQL> prompt appears on your screen to indicate that you have successfully established a session. You can also start SQL*Plus with the username and password at the command line, as shown in Figure 2-5. In this case, if the username/password are valid, the SQL> prompt will appear. If not, you will be asked to enter a valid username and password.
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Figure 2-5. SQL*Plus screen after a successful connection using the username/password at the command line You can leave SQL*Plus with the commands EXIT or QUIT.
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Entering Commands
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SQL*Plus not only understands the SQL language, but it also supports and recognizes several toolspecific SQL*Plus commands. You must make sure to distinguish these SQL*Plus commands from SQL commands, because SQL*Plus treats these two command types differently, as you will see. Let s start by entering an arbitrary (and rather simple) SQL command in SQL*Plus, as shown in Listing 2-2.
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Listing 2-2. A Basic SQL SELECT Command SQL> select * 2 from employees; Notice that SQL commands are often spread over multiple lines and, by default, SQL*Plus automatically displays line numbers during SQL command entry. If your SQL command is fully entered and you want SQL*Plus to execute it for you, you should finish the last line with a semicolon (;) as a delimiter. If you forget the semicolon (this will probably happen quite often, initially), you can still enter that semicolon on the next (empty) line, as shown here: SQL> select * 2 from employees 3 ; Either way, the command will execute. SQL*Plus will return all columns and all rows of the EMPLOYEES table, since the asterisk character (*) means to show all columns of this table. EMPNO ----7369 7499 7521 7566 7654 7698 7782 7788 7839 7844 7876 7900 7902 7934 ENAME -------SMITH ALLEN WARD JONES MARTIN BLAKE CLARK SCOTT KING TURNER ADAMS JONES FORD MILLER INIT ----N JAM TF JM P R AB SCJ CC JJ AA R MG TJA JOB MGR BDATE MSAL COMM DEPTNO -------- ----- --------- ----- ----- -----TRAINER 7902 17-DEC-65 800 20 SALESREP 7698 20-FEB-61 1600 300 30 SALESREP 7698 22-FEB-62 1250 500 30 MANAGER 7839 02-APR-67 2975 20 SALESREP 7698 28-SEP-56 1250 1400 30 MANAGER 7839 01-NOV-63 2850 30 MANAGER 7839 09-JUN-65 2450 10 TRAINER 7566 26-NOV-59 3000 20 DIRECTOR 17-NOV-52 5000 10 SALESREP 7698 28-SEP-68 1500 0 30 TRAINER 7788 30-DEC-66 1100 20 ADMIN 7698 03-DEC-69 800 30 TRAINER 7566 13-FEB-59 3000 20 ADMIN 7782 23-JAN-62 1300 10
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Using the SQL Buffer
SQL*Plus stores your most recent SQL command in an area called the SQL buffer. The SQL buffer is an important SQL*Plus concept. You can display the contents of the SQL buffer using a SQL*Plus command called LIST, as shown in Listing 2-3. Listing 2-3. The SQL*Plus LIST Command SQL> L 1 select * 2* from employees SQL>
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