问题
When I try to execute this statement in Oracle SQL Developer 2.1 a dialog box "Enter Substitution Variable" pops up asking for a replacement value for TOBAGO,
update t set country = 'Trinidad and Tobago' where country = 'trinidad & tobago';
How can I avoid this without resorting to chr(38) or u'trinidad \0026 tobago' which both obscure the purpose of the statement?
回答1:
Call this before the query:
set define off;
Alternatively, hacky:
update t set country = 'Trinidad and Tobago' where country = 'trinidad &' || ' tobago';
From Tuning SQL*Plus:
SET DEFINE OFF disables the parsing of commands to replace substitution variables with their values.
回答2:
In SQL*Plus putting SET DEFINE ? at the top of the script will normally solve this. Might work for Oracle SQL Developer as well.
回答3:
this will work as you asked without CHAR(38):
update t set country = 'Trinidad and Tobago' where country = 'trinidad & '|| 'tobago';
create table table99(col1 varchar(40));
insert into table99 values('Trinidad &' || ' Tobago');
insert into table99 values('Trinidad &' || ' Tobago');
insert into table99 values('Trinidad &' || ' Tobago');
insert into table99 values('Trinidad &' || ' Tobago');
SELECT * FROM table99;
update table99 set col1 = 'Trinidad and Tobago' where col1 = 'Trinidad &'||' Tobago';
回答4:
set scan off; Above command also works.
回答5:
I was having some issue around this too. Something was starting up everytime I tried to setup a connection to any DB..
What worked for me was removing any startup script that you might have configured!
i.e. Tools>Preferences...>Database and
remove any file path that you have in the text box labeled
"Filename for connection startup script"!
来源：https://stackoverflow.com/questions/2333994/how-to-avoid-variable-substitution-in-oracle-sql-developer-with-trinidad-toba