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In iSQL*Plus, the possibilities of working with HTML are even more powerful than in SQL*Plus. This makes sense, since iSQL*Plus itself executes in a browser environment. For example, all iSQL*Plus results are by default in HTML format, based on a standard iSQL*Plus style sheet. If you execute the query of Listing 11-37 in iSQL*Plus, you don t need to specify any SQL*Plus HTML settings (such as MARKUP or SPOOL), and you don t need to open the results in a browser, because this now happens implicitly. Check out the HTML possibilities available through iSQL*Plus Preferences. To access the iSQL*Plus Preferences screen, click the Preferences link in the top-right corner of the Workspace screen. Then click the Script Formatting link under System Configuration (see Figure 2-7 in 2). See Figure 11-4 for a small sample of the options. If you want to execute scripts in iSQL*Plus, you can do that in various ways. First of all, you can enter the script manually (or with copy and paste) into the Workspace area. However, if you click the Load Script button, you re offered two further possibilities, as shown in Figure 11-5. You can specify a local script in the File field, optionally using the Browse button, or you can use the URL field to specify a script from the Internet. Then you can click the Load button, followed by the Execute button to run the script. Just as you can start SQL*Plus with a single command line, including the SQL*Plus script that you want to execute, you can also use the iSQL*Plus address toolbar in several ways to specify additional information. You must add the keyword dynamic if you want to specify additional information in the iSQL*Plus URL. For example, you can specify a name and a password, allowing you to skip the login dialog box, as shown here: http://<IP address>:<port>/isqlplus/dynamic userid=book/book This example shows how you can specify a script to be executed: http://<IP address>:<port>/isqlplus/dynamic script=http://...
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CHAPTER 11 SQL*PLUS AND i SQL*PLUS
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Figure 11-4. iSQL*Plus Script Formatting Preferences
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Figure 11-5. Loading iSQL*Plus Scripts
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CHAPTER 11 SQL*PLUS AND i SQL*PLUS
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The following example is a combination of the first two examples. Note that the parameter section always starts with a question mark ( ) and the individual parameters are separated using an ampersand (&). http://<IP address>:<port>/isqlplus/dynamic userid=book/book &script=http://... Your URL can also contain an SQL command to be executed, including all other information needed to connect to the database. The following example loads the SQL command into the iSQL*Plus workspace and then waits for further commands. http://<IP address>:<port>/isqlplus/dynamic userid=book/book &script=select%20*%20from%20departments; &type=text &action=load This example executes the SQL command and displays the results: http://<IP address>:<port>/isqlplus/dynamic userid=book/book &script=select%20*%20from%20departments; &type=text &action=execute In this example (with action=execute), the browser displays only the results and suppresses the regular iSQL*Plus screen layout, just as in Figure 11-3. Also, note that we replaced all spaces in the last two URL examples by %20, which is a commonly accepted browser standard. This is done because iSQL*Plus doesn t support spaces.
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11.6 Exercises
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The following exercises allow you to practice using the commands covered in this chapter. See Appendix D for the answers. 1. Look at Listings 11-26 and 11-37. Apart from aesthetics, there is another important reason why the lines surrounding the script headers in those two listings switch from minus signs to equal signs. Obviously, the first two minus signs are mandatory to turn the lines into comments. What would be wrong with using only minus signs 2. Create a SQL*Plus script to create indexes. The script should prompt for a table name and a column name (or list of column names), and then generate the index name according to the following standard: i_<tab-id>_<col-id>. 3. Create a SQL*Plus script to produce an index overview. The script should prompt for a table name, allowing you to specify any leading part of a table name. That is, the script should automatically append a % wildcard to the value entered. Then it should produce a report of all indexes, showing the table name, index name, index type, and number of columns on which the index is based. 4. Create a script that disables all constraints in your schema.
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