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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.
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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 4-15 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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The semicolon (;) normally acts as the terminator for SQL statements. The period (.) is the default value for the BLOCKTERMINATOR variable, and it indicates the end of the statement inputting.
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Listing 4-15. Using the INPUT Command (i) to Insert a New Line at the End of a Script SQL> SELECT username, status, process, sid, serial# 2 FROM v$session 3* WHERE status = 'ACTIVE' SQL> i 4 and username = 'HR'; USERNAME --------HR SQL> STATUS ------ACTIVE PROCESS -------1856:444 SID ---8 SERIAL# -------64
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Listing 4-16 shows how to insert a line in the middle of a SQL script. You just print the line on the screen by using the LIST command and then add the new line afterward using the INPUT command.
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CH APT ER 4 US ING SQ L*PLUS AN D O RA CLE E NTE RPR IS E MA NAGE R
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Listing 4-16. Using the INPUT Command to Insert a Line in the Middle of a Script SQL> SELECT username, status, process, sid, serial# 2 FROM v$session 3 WHERE status='ACTIVE' SQL> 1 1* SELECT username, status, process, sid, serial# SQL> i 2i ,logon_time,terminal 3i . SQL> 1 2 3 4* SQL> l SELECT username, status, process, sid, serial#, logon_time,terminal FROM v$session WHERE status='ACTIVE'
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Similarly, you can delete one or more lines of the SQL buffer by using the delete command DEL (or just D), accompanied by the line number, as shown in Listing 4-17. Listing 4-17. Deleting Text in SQL*Plus SQL> 2 3 4* SQL> SQL> 1 2 3* SQL> SELECT username, status, process, sid, serial# FROM v$session WHERE status = 'ACTIVE' AND username='HR' del4 l SELECT username, status, process, sid, serial# FROM v$session WHERE status = 'ACTIVE'
The DEL command will delete the specified line. Using the DEL command without a line number will remove the last line of the SQL you have in the buffer.
Adding to Text
Sometimes you need to add a word or two to a particular line. Instead of invoking the editor, you can just use the APPEND command to accomplish this, as shown in Listing 4-18. Listing 4-18. Using the APPEND Command SQL> 2 3 SQL> 1* SQL> 1* SQL> 1 2* SQL> SELECT username, profile FROM dba_users . 1 SELECT username, profile APPEND , created_date select username, profile, created_date l SELECT username, profile, created_date FROM dba_users
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Sometimes, you may have a semicolon inside one of your statements, which will be interpreted as a statement terminator by SQL*Plus, leading to an error. Here s an example: SQL> INSERT INTO EMPLOYEES VALUES ('BEGIN 2 LOAD_PROCEDURE); 3* END'); The semicolon in line 2 is not the end of the statement, and therefore you ll get the following error when you enter the preceding statement: ERROR: ORA-01756: quoted string not properly terminated The default value of the SQLTERMINATOR variable is a semicolon (;). You can resolve the problem here by simply turning off the use of the semicolon as a statement terminator, by using the SQLTERMINATOR variable, as shown here: SET SQLTERMINATOR OFF SQL> INSERT INTO EMPLOYEES VALUES ('BEGIN 2 LOAD_PROCEDURE); 3* END') / Note that since you turned off the use of the semicolon as a statement terminator, you should use the slash (/) to execute the statement. You can also use the BLOCKTERMINATOR variable, whose default value is a period (.), to signify the end of the statement.
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