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WRITING AND AUTOMATING SQL*PLUS SCRIPTS
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SQL> define x DEFINE X SQL>
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42 (NUMBER)
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The PROMPT command allows you to write text to the screen, the PAUSE command allows you to suspend script execution, and the ACCEPT command gives you full control over the datatype of the userdefined variable and the screen text prompting for a value. Just try to enter a nonnumeric value for variable X in Listing 11-10. You will get the following SQL*Plus error message: Enter a value for x: monkey SP2-0425: "monkey" is not a valid NUMBER
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Caution Splitting commands over multiple lines by using the minus sign as an escape character is relevant only for SQL*Plus commands, not for SQL commands.
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SQL*Plus System Variables
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The third category of SQL*Plus variables is system variables. The values of these system-defined SQL*Plus variables control the overall behavior of SQL*Plus. You already saw various examples of these system variables, such as PAGESIZE and PAUSE, in 2. In the previous section, you learned that you need the SQL*Plus commands DEFINE and UNDEFINE to manage user-defined variables. For system variables, you need the SQL*Plus commands SET and SHOW to assign or retrieve values, respectively. Listing 11-11 shows some examples of system variables. Listing 11-11. Some SQL*Plus System Variable Examples SQL> show pagesize pagesize 36 SQL> show pause PAUSE is OFF SQL> set SQL> set SQL> set pause '[Enter]... ' pause on pagesize 10
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SQL> select * from employees; [Enter]... EMPNO ----7369 7499 7521 7566 ENAME -------SMITH ALLEN WARD JONES INIT ----N JAM TF JM JOB MGR BDATE MSAL COMM DEPTNO -------- ----- ----------- ----- ----- -----TRAINER 7902 17-DEC-1965 800 20 SALESREP 7698 20-FEB-1961 1600 300 30 SALESREP 7698 22-FEB-1962 1250 500 30 MANAGER 7839 02-APR-1967 2975 20
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WRITING AND AUTOMATING SQL*PLUS SCRIPTS
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7654 MARTIN 7698 BLAKE 7782 CLARK [Enter]... EMPNO ----7788 7839 7844 7876 7900 7902 7934 ENAME -------SCOTT KING TURNER ADAMS JONES FORD MILLER
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P R AB INIT ----SCJ CC JJ AA R MG TJA
SALESREP MANAGER MANAGER
7698 28-SEP-1956 7839 01-NOV-1963 7839 09-JUN-1965
1250 2850 2450
30 30 10
JOB MGR BDATE MSAL COMM DEPTNO -------- ----- ----------- ----- ----- -----TRAINER 7566 26-NOV-1959 3000 20 DIRECTOR 17-NOV-1952 5000 10 SALESREP 7698 28-SEP-1968 1500 0 30 TRAINER 7788 30-DEC-1966 1100 20 ADMIN 7698 03-DEC-1969 800 30 TRAINER 7566 13-FEB-1959 3000 20 ADMIN 7782 23-JAN-1962 1300 10
14 rows selected. SQL> set pause off pagesize 42 SQL> show all ... SQL> If you execute the last command of Listing 11-11 (SHOW ALL), you will see that the number of SQL*Plus system variables is impressive. That s why the output in Listing 11-11 is suppressed. Table 11-1 shows an overview of the SQL*Plus system variables, listing only the most commonly used SQL*Plus system variables. Where applicable, the third column shows the default values. In the first column, the brackets indicate abbreviations you may want to use. Table 11-1. Some Common SQL*Plus System Variables
Variable
COLSEP CON[CAT] DEF[INE] ECHO FEED[BACK] HEA[DING] HEADS[EP] LIN[ESIZE]
Description
String to display between result columns Character to mark the end of a variable name Character to refer to variable values Display or suppress commands (relevant only for scripts)
Default
(space) . (period) & (ampersand) OFF
Display ... rows selected from a certain minimum result size 6 Display column names above results Divide column headers over multiple lines Line or screen width, in characters ON | (vertical bar) 80
WRITING AND AUTOMATING SQL*PLUS SCRIPTS
LONG NEWP[AGE] NULL NUMF[ORMAT] NUM[WIDTH] PAGE[SIZE] PAU[SE] RELEASE SQLP[ROMPT] SQLT[ERMINATOR] TAB TIMI[NG] TRIMS[POOL] USER VER[IFY]
Default width for LONG columns Number of empty lines after every page break Display of null values in the results Default format to display numbers Default width for numeric columns Number of lines per page Display results page by page, with pauses Release or version of the RDBMS (cannot be set) SQL*Plus prompt string SQL command delimiter (execute the command) Show tab characters, else display as spaces Show elapsed time after each command Suppress trailing spaces in spool files Username for the current SQL*Plus session (cannot be set) Show command lines before/after variable substitution
80 1
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