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SQL*Plus stores your most recently issued SQL statement in an area of memory called the SQL buffer. Unfortunately, SQL*Plus lets you save only the last command you issued in the buffer. Every new statement that you enter replaces the previous statement in the buffer. If you want to see the previous command you issued, type the word LIST or just the letter l. SQL> 1 2 3* SQL> l SELECT username, status, process, sid, serial# FROM v$session WHERE status = 'ACTIVE'
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If you want to see what s in your SQL script before you execute it, load it from the operating system into the SQL buffer by using the GET command, as follows: SQL> 1 2 3* SQL> GET status.sql SELECT username,status,process,sid,serial# FROM v$session WHERE status = 'ACTIVE'
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Caution 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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CH APT ER 4 US ING SQ L*PLUS AN D O RA CLE E NTE RPR IS E MA NAGE R
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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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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 4-14 shows how to use pattern matching to replace text in a SQL*Plus session. Listing 4-14. 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> /
CH APT ER 4 USI NG SQ L*PLUS AND O RAC LE EN TER PRI SE MAN AGER
USERNAME -----------------
SYSTEM 7 rows selected. SQL>
STATUS ------ACTIVE ACTIVE ACTIVE ACTIVE ACTIVE ACTIVE ACTIVE
PROCESS ------2076 2080 2084 2088 2092 2096 1856:444
SID --1 2 3 4 5 6 8
SERIAL# -------1 1 1 1 1 1 58
If you have a complicated script, making changes using pattern matching as shown in Listing 4-14 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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