Help escaping from user input, whatever they are
I need help escaping from the user input whatever they may be. Currently, I did the following searches with no luck.CONTAINS (columnName, ' % a %', 1) > 0
CONTAINS (columnName, '% {%}', 1) > 0
Looking for a Word with a "%' in it as follows"stocks have increased by 13%."
You must put the % as a printjoin in a lexer and use this lexer in the index settings in order for the % to include in the indexed tokens. Then you can use-to escape to the % as an individual character. You cannot combine sentences using the {and} with wildcard characters who escape. Please see the demo below.
SCOTT@orcl_11gR2> -- table:
SCOTT@orcl_11gR2> create table test_tab
2 (columnName clob)
3 /
Table created.
SCOTT@orcl_11gR2> -- lexer with % included in printjoins:
SCOTT@orcl_11gR2> begin
2 ctx_ddl.create_preference ('test_lex', 'basic_lexer');
3 ctx_ddl.set_attribute ('test_lex', 'printjoins', '%');
4 end;
5 /
PL/SQL procedure successfully completed.
SCOTT@orcl_11gR2> -- index using lexer:
SCOTT@orcl_11gR2> create index test_idx
2 on test_tab (columnName)
3 indextype is ctxsys.context
4 parameters
5 ('lexer test_lex
6 transactional')
7 /
Index created.
SCOTT@orcl_11gR2> -- test data:
SCOTT@orcl_11gR2> insert all
2 into test_tab (columnName) values ('The shares have increased by 13%.')
3 into test_tab (columnName) values ('other data')
4 select * from dual
5 /
2 rows created.
SCOTT@orcl_11gR2> commit
2 /
Commit complete.
SCOTT@orcl_11gR2> -- query:
SCOTT@orcl_11gR2> select * from test_tab
2 where contains (columnName, '%\%%') > 0
3 /
COLUMNNAME
--------------------------------------------------------------------------------
The shares have increased by 13%.
1 row selected.
Tags: Database
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