| 在实际应用中，SQLPLUS中的new_value作用是很大的，利用它可以解决许多的问题。
引用如下：
Oracle SQL*Plus has a very useful new sub-parameter to the column parameter called new_value. The new_value directive allows data that has been retrieved from an oracle table to be stored as a variable inside the SQL*Plus script.
By using the new_value parameter you can make your SQL*Plus script behave like a real programming language, storing and addressing program variables, just like in PL/SQL.
The ability to store SQL*Plus variables and fill them wITh oracle data is a very powerful feature and makes SQL*Plus scripts more efficient because database access is reduced.
使用方法如下：
#!/bin/sh
export oracle_SID=CMPR1
export ORACLE_HOME=/app/oracle/product/9205
export PATH=$oracle_HOME/bin:$PATH
sqlplus -s/nolog <
conn / as sysdba
column inst_num new_value ninst_num format 99999;
column inst_name new_value ninst_name format a12;
column db_name new_value ndb_name format a12;
column dbid new_value ndbid format 9999999999;
select d.dbid dbid
, d.name db_name
, i.instance_number inst_num
, i.instance_name inst_name
from v$database d,
v$instance i;
prompt ###############Use new_value####################
select dbid,name from v$database where name='&ndb_name';
prompt ################Use variable###################
variable dbid number;
variable inst_num number;
begin
:dbid := &ndbid;
:inst_num := &ninst_num;
end;
/
select instance_name,instance_number from v$instance where instance_number=:inst_num;
select dbid,name from v$database where dbid=:dbid;
prompt ##############Use sql file#####################
@cs.sql &ndb_name &ndbid &ninst_num
ExIT
EOF
[/app/oracle/utils/scripts]$ cat cs.sql
select dbid,name from v$database where name='&1';
variable dbid number;
variable inst_num number;
begin
:dbid := &2;
:inst_num := &3;
end;
/
select instance_name,instance_number from v$instance where instance_number=:inst_num;
select dbid,name from v$database where dbid=:dbid;
variable dbid number;
variable inst_num number;
begin
:dbid := &ndbid;
:inst_num := &ninst_num;
end;
/
select instance_name,instance_number from v$instance where instance_number=:inst_num;
select dbid,name from v$database where dbid=:dbid; |
