c# barcode image generation library Spooling a SQL*Plus Session in Java

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Spooling a SQL*Plus Session
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You can record the complete results (as displayed on your screen) of a SQL*Plus session in an operating system file, using the SQL*Plus SPOOL command. Listing 2-24 shows an example. Listing 2-24. Using the SQL*Plus SPOOL Command SQL> SQL> ... SQL> ... SQL> spool BLA.TXT [create|replace|append] select * from employees; select * from departments; spool off
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The BLA.TXT file, created in the same directory or folder where the SAVE command stores its script files, now contains a complete copy of all screen output. As Listing 2-24 shows, you can influence the
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INTRODUCTION TO SQL, SQL*PLUS, AND SQL DEVELOPER
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behavior of the SPOOL command by specifying one of the following keywords: CREATE, REPLACE, or APPEND. With these three options, you can specify which behavior you want in case the specified file already exists. Just try these options for yourself; the error messages are self-explanatory.
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Describing Database Objects
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When formulating SQL commands, it is sometimes convenient to get a quick overview of the structure of a table; for example, to see the column names and the datatypes. In such cases, the SQL*Plus DESCRIBE command is what you need. See Listing 2-25 for an example. Listing 2-25. The SQL*Plus DESCRIBE Command SQL> descr employees Name ----------------------------EMPNO ENAME INIT JOB MGR BDATE MSAL COMM DEPTNO SQL> Null -------NOT NULL NOT NULL NOT NULL Type -------------------NUMBER(4) VARCHAR2(8) VARCHAR2(5) VARCHAR2(8) NUMBER(4) NOT NULL DATE NOT NULL NUMBER(6,2) NUMBER(6,2) NUMBER(2)
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Executing Commands from the Operating System
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The HOST command (most implementations support a platform-specific shortcut, such as $ or !) allows you to execute commands at the underlying operating system; for example, on a Microsoft Windows system, a command window is opened. Depending on the underlying operating system, you can finish the subsession and return to your SQL*Plus session with EXIT, LOGOUT, or a similar command.
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Clearing the Buffer and the Screen
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With the CLEAR BUFFER command, you can empty the SQL buffer in SQL*Plus. This is something you won t need to do too often, because the SQL buffer is overwritten each time by consecutive commands. With the CLEAR SCREEN command, you can start at the top of a new, empty SQL*Plus screen.
SQL*Plus Command Review
Table 2-12 shows an overview of all SQL*Plus commands covered in this chapter (including the SQL*Plus editor commands already listed in Table 2-10).
INTRODUCTION TO SQL, SQL*PLUS, AND SQL DEVELOPER
Table 2-12. Some SQL*Plus Commands
Command
SAVE GET START or @ SPOOL SET SHOW COLUMN ... FORMAT STORE SET DESCRIBE HOST or $ CLEAR BUFFER CLEAR SCREEN
Description
Save the SQL buffer contents in a script file Read a saved script file back into the SQL buffer Execute the contents of a script file Copy all screen output to a file Change a SQL*Plus setting Show the current value of SQL*Plus settings Change screen display attributes of a column Save the current SQL*Plus settings in a script file Provide a description of a database object Start a subsession at the operating system level Empty the SQL buffer Start with an empty SQL*Plus screen
We also introduced the following SQL command in this section: ALTER SESSION changes various settings for your session, such as NLS settings.
2.4 Introduction to SQL Developer
SQL Developer is the Graphical User Interface (GUI) tool that Oracle supplies to query the database, explore objects, run reports, and run scripts. It runs on Windows, Linux and Mac OSX. It can be used to access Oracle databases 9i, 10g, and 11g, as well as other databases such as Times Ten, Microsoft Access, MySQL and SQL Server.
Installing and Configuring SQL Developer
SQL Developer is included as part of Oracle Database 11g. You can also download it from the following URL: http://www.oracle.com/technology/products/database/sql_developer/index.html.
INTRODUCTION TO SQL, SQL*PLUS, AND SQL DEVELOPER
Once you save the downloaded archive and extract it to a directory, double click on sqldeveloper.exe to start SQL Developer.
Note SQL Developer for Windows does not create any menu shortcuts or icons on the desktop. You need to create these manually if you want them. Create a desktop shortcut by right clicking on the file and selecting Send To Desktop (create shortcut). SQL Developer also does not create any registry entries. Thus, uninstalling SQL Developer is as simple as deleting the SQL Developer directory that you created when you unpacked the archive.
One of the first tasks that you may be prompted to do when you start SQL Developer for the first time is to locate the Java Development Kit (JDK). If you selected the option to download SQL Developer with the JDK, then java.exe will be included. In this example, SQL Developer is installed in C:\oracle\product\sqldeveloper and the location of the JDK will be in the subdirectory structure show in Figure 2-8.
Figure 2-8. SQL Developer java.exe location When SQL Developer first starts, the Start Page shown in Figure 2-9 opens. This page includes links to documentation, to tutorials, and to the SQL Developer Forum.
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