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If you just enter the slash (/) command in your SQL*Plus session, you ll execute the last command you entered, which is always stored in the SQL buffer. It s a very good idea to always use the LIST command to first see what you re actually executing.
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Sometimes you may want to execute several SQL command scripts consecutively. You can specify all the scripts you want to run in one main script and just run that main script all the included scripts will run consecutively. Here s an example of how you can embed several SQL scripts into one main file: SQL> 1 2 3 4* SQL> GET one_script.sql @check.sql @create_table.sql @insert_table.sql @create_constraint.sql
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When you run the one_script.sql script, its four constituent scripts will run one after the other. This is an efficient way to execute scripts, especially when you re creating and populating a new database, provided you have already tested the individual scripts.
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You can also use the @@commandfile notation, as in @@one_script.sql to run command files that include several command files. The use of the @@ notation ensures that Oracle looks for the individual files in the same path as the command file.
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CHAPTER 12 USING SQL*PLUS AND iSQL*PLUS
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Often you ll want to make minor changes in the SQL code you re using. It isn t necessary to resort to your editor for minor changes, though, because SQL*Plus comes with its own change command, aptly called CHANGE. Simple pattern-matching techniques are used to modify SQL*Plus command lines. Therefore, you can add or modify a word or a part of a word by just replacing an existing pattern in a word with a new one. The general pattern for changing SQL text is C/OLD/NEW, where C is the shortened form of the CHANGE command, which lets you change the first occurrence of the specified text on the current line, OLD stands for the actual SQL you intend to change, and NEW stands for the SQL text that is replacing the old text. Listing 12-14 shows how to use pattern matching to replace text in a SQL*Plus session. Listing 12-14. Changing Text Using Pattern Matching SQL> SELECT username,status,process,sid,serial 2 FROM v$session 3* WHERE status = 'ACTIVE'; select username,status,process,sid,serial * ERROR at line 1: ORA-00904: invalid column name SQL> 1 1* SELECT username,status,process,sid,serial SQL> c/serial/serial# 1* SELECT username,status,process,sid,serial# SQL> l 1 SELECT username,status,process,sid,serial# 2 FROM v$session 3* WHERE status = 'ACTIVE' SQL> / USERNAME STATUS PROCESS SID SERIAL# --------------------------------------------------------ACTIVE 2076 1 1 ACTIVE 2080 2 1 ACTIVE 2084 3 1 ACTIVE 2088 4 1 ACTIVE 2092 5 1 ACTIVE 2096 6 1 SYSTEM ACTIVE 1856:444 8 58 7 rows selected. SQL> If you have a complicated script, making changes using pattern matching as shown in Listing 12-14 can quickly get hairy! Use the runtime editor instead to make your changes conveniently. Saving the changes will bring you into the SQL*Plus interface automatically, and you can execute your edited SQL there.
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In UNIX, the usual editor is the vi editor, and in Windows, the usual editor is Notepad. You invoke them by typing ed at the SQL*Plus command line.
CHAPTER 12 USING SQL*PLUS AND iSQL*PLUS
Inserting and Deleting Lines in SQL*Plus
You can always remove a line from or add one to your SQL text by merely invoking the editor and making the changes there. The SQL*Plus interface also offers you easy ways to add and delete lines. Using the INPUT command, you can easily add one or more lines to the SQL text already in the SQL buffer. To use the INPUT command, just type the letter i. Listing 12-15 shows how you can insert text on a new line at the end of a SQL script. When you re done inserting new lines, you can type a period (.) to get the SQL prompt back.
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