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WRITING AND AUTOMATING SQL*PLUS SCRIPTS
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single-user Oracle environment, using both scripts is useless and can be confusing. The glogin.sql script is normally located in the sqlplus/admin subdirectory under the Oracle installation directory.
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Caution In Oracle Database 10g, SQL*Plus also executes the glogin.sql and login.sql scripts if you execute a CONNECT command, without leaving SQL*Plus. This didn t happen with earlier releases of SQL*Plus.
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You can use the glogin.sql and login.sql scripts to set various SQL*Plus system variables, userdefined variables, and column definitions. Listing 11-26 shows an example of a login.sql script, demonstrating that you can also execute SQL commands from this script. You can test it by saving this file to the right place and restarting SQL*Plus. Listing 11-26. Example of a login.sql Script -- =========================================== -- LOGIN.SQL -- =========================================== set pause "Enter... " set pause on set numwidth 6 set pagesize 24 alter session set nls_date_format='dd-mm-yyyy'; -- define_editor=Notepad /* for Windows */ -- define_editor=vi /* for UNIX */ clear screen
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11.4 Report Generation with SQL*Plus
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As you ve learned in previous chapters, the SQL language enables you to write queries. Queries produce result tables. However, the default layout of those query results is often visually unappealing. SQL*Plus offers many commands and features to enhance your query results into more readable reports. SQL*Plus is definitely the oldest quick-and-dirty Oracle report generator; the original name in the 1980s was UFI (User Friendly Interface), before they renamed it as SQL*Plus. Several other Oracle reporting tools were developed and discarded over the years, but SQL*Plus is still here. Table 11-2 lists some of the SQL*Plus features you can use for enhancing your reports.
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Table 11-2. SQL*Plus Features to Enhance Reports
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SET {LINESIZE|PAGESIZE|NEWPAGE} SET TRIMSPOOL ON COLUMN TTITLE, BTITLE REPHEADHER, REPFOOTER BREAK COMPUTE SPOOL
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Description
Adjust the page setup; set to 0 suppresses page formatting Suppress trailing spaces in SPOOL output Adjust column layouts (header and contents) Define top and bottom page titles Define report headers and footers Group rows (make sure the result is ordered appropriately) Add aggregate computations on BREAK definitions Spool SQL*Plus output to a file
The SQL*Plus SET command was introduced in Section 11.1, in the discussion of SQL*Plus system variables. Now we ll look at the other SQL*Plus commands that are useful for producing reports.
The SQL*Plus COLUMN Command
You also already saw some examples of the COLUMN command. However, the SQL*Plus COLUMN command has many additional features, as you will learn in this section. The general syntax of the SQL*Plus COLUMN command is as follows: SQL> column [<col-name>|<expression>] [<option>...] If you don t specify any arguments at all, the COLUMN command produces a complete overview of all current column settings. If you specify <col-name>, you get only the settings of that column. Note that <col-name> is mapped with column aliases in the SELECT clause; that is, with the column headings of the final query result. You can use <expression> to influence SELECT clause expressions; make sure to copy the expression verbatim from the query. For <option>, you can specify various ways to handle the column. Table 11-3 shows a selection of the valid options for the COLUMN command.
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Table 11-3. Some SQL*Plus COLUMN Command Options
Option
ALI[AS] CLE[AR] FOLD_A[FTER] FOR[MAT] HEA[DING] JUS[TIFY] LIKE NEWL[INE] NEW_V[ALUE] NO[PRI[NT]] NUL[L] ON | OFF WRA[PPED] WOR[D_WRAPPED]
Description
Column alias; useful in BREAK and COMPUTE commands Reset all column settings Insert a carriage return after the column Format display of column values Define (different) column title for display Justify column header: LEFT, CENTER or CENTRE, RIGHT Copy settings over from another column Force a new line before this column Substitution variable to retain the last column value Suppress (NOPRINT) or display (PRINT) specific columns Display of null values in specific columns Toggle to activate/deactivate column settings Wrap too-long column values to the following line Wrap too-long column values to the following line, splitting the column value between words Truncate too-long column values
TRU[NCATED]
The last three COLUMN options are mutually exclusive. In Table 11-3, the brackets indicate the abbreviations you can use. For example, you can abbreviate the first SQL*Plus command in Listing 11-27 as COL ENAME FOR A20 HEA LAST_NAME JUS C, if you like. If you do not specify a JUSTIFY value for a column, SQL*Plus uses the following alignment defaults: NUMBER column headings default to RIGHT. Other column headings default to LEFT.
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