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WRITING AND AUTOMATING SQL*PLUS SCRIPTS
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The SQL*Plus error message in Listing 11-35 (followed by the Usage: text) precisely indicates what you can do to fix the problem with the incomplete SET MARKUP command: SET MARKUP HTML is mandatory, followed by ON or OFF. HEAD allows you to specify text for the HTML <header> tag, BODY for the <body> tag, and TABLE for the <table> tag, respectively. ENTMAP allows you to indicate whether SQL*Plus should replace some special HTML characters (such as <, >, ', and &) with their corresponding HTML representations (<, >, ", and &). SPOOL lets you spool output to a file, without needing to use an additional SQL*Plus SPOOL command. PREFORMAT allows you to write output to a <pre> tag. The default value is OFF.
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The HEADER option of the SET MARKUP command is particularly interesting, because it allows you to specify a cascading style sheet. Let s perform some experiments, as shown in Listing 11-36. Listing 11-36. Using the SQL*Plus SET MARKUP Command SQL> set markup html on head "<title>SQL*Plus demo</title>" SQL> select ename,init from employees where deptno = 10; <br> <p> <table border='1' width='90%' align='center' summary='Script output'> <tr> <th scope="col"> last_name </th> <th scope="col"> INIT </th> </tr> <tr> <td> CLARK </td> <td> AB </td> </tr> <tr> <td> KING </td> <td> CC </td> </tr> <tr> <td>
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MILLER </td> <td> TJA </td> </tr> </table> <p> SQL> set markup html off <br> SQL> As you can see in Listing 11-36, the screen output is in HTML format. Obviously, the MARKUP setting becomes truly useful in combination with the SQL*Plus SPOOL command, allowing you to open the result in a browser. The combination of the SQL*Plus MARKUP and SPOOL commands is so obvious that you are able to specify SPOOL ON as an option in the MARKUP setting (see Listing 11-35).
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Tip You can also specify the MARKUP setting as a command-line argument when you launch SQL*Plus. This is useful for certain reports, because SQL*Plus then processes the <html> and <body> tags before the first command is executed.
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If you execute the SQL*Plus script in Listing 11-37, you will note what happens as a consequence of the SET ECHO OFF TERMOUT OFF command: the SQL*Plus screen remains empty. SQL*Plus only writes the results to a file. Listing 11-37. Contents of the htmldemoscript.sql Script -- ================================ -- htmldemoscript.sql -- ================================ SET ECHO off TERMOUT OFF set markup html on spool on preformat off entmap on head "<title>HTML Demo Report</title> <link rel='stylesheet' href='x.css'>" spool htmldemo.htm replace select empno, ename, init, msal from employees where deptno = 20; spool off set markup html off set echo on
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Figure 11-3 shows what happens if you open the result in a browser. The example assumes that you have an x.css cascading style sheet document in the current folder/directory.
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Figure 11-3. The result of htmldemoscript.sql in a browser One more tip: you can achieve various special effects by selecting HTML fragments as alphanumerical literals in your queries. Listing 11-38 shows what happens if you add the following fragment to the htmldemoscript.sql script, just before the SPOOL OFF command. Listing 11-38. Addition to the htmldemoscript.sql Script set markup html entmap off preformat on set heading off select '<a href="http://www.naturaljoin.nl"> Visit this web site</a>' from dual;
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11.6 Building SQL*Plus Scripts for Automation
Inevitably, as you work in SQL*Plus, you will want to create scripts of SQL commands that do more than generate a nicely-formatted report in text or HTML. You will want a script that has all the characteristics of a batch program: capturing input parameters, performing complex tasks, passing data values from one SQL statement into another, handling error conditions intelligently, and returning meaningful exit status codes to the calling environment. An amazing volume of these scripts exists on every database server in the world, and the power of SQL*Plus enables a developer or database administrator to do practically anything by means of SQL*Plus scripts.
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