Escaping characters ( ) [ ] in sql contains

Question

Please, help!
select * from mytable where (contains(BINARY_DATA, '<query-string>' ) > 0)where binary_data is BLOB field (indexed)
And i need to put, such strings for the query to work well : ( ) [    ]
% and _ were succesfully escaped, but i didnt find information on how the parentheses are escaped. Could you please help?
Thanks in advance.

Answer 1

Also, ()[] are not indexed by basic lexer, therefore
where contains(text,'Hello\(World') > 0will match 'Hello ) World', 'Hello[World', etc:
[code]
SQL> drop table test_table
2 /
Table dropped.
SQL> create table test_table (id number,text blob)
2 /
Table created.
SQL> insert into test_table values (1,utl_raw.cast_to_raw ('Hello World'))
2 /
1 row created.
SQL> insert into test_table values (2,utl_raw.cast_to_raw ('Hello(World'))
2 /
1 row created.
SQL> insert into test_table values (3,utl_raw.cast_to_raw ('Hello)World'))
2 /
1 row created.
SQL> insert into test_table values (4,utl_raw.cast_to_raw ('Hello[World'))
2 /
1 row created.
SQL> insert into test_table values (5,utl_raw.cast_to_raw ('Hello]World'))
2 /
1 row created.
SQL> insert into test_table values (6,utl_raw.cast_to_raw ('Hello([World'))
2 /
1 row created.
SQL> insert into test_table values (7,utl_raw.cast_to_raw ('Hello(_World'))
2 /
1 row created.
SQL> create index test_table_idx on test_table (text) indextype is ctxsys.context
2 /
Index created.
SQL> select id from test_table where contains(text,'Hello World') > 0
2 /
ID
1
2
3
4
5
6
7
7 rows selected.
SQL> select id from test_table where contains(text,'Hello\(World') > 0
2 /
ID
1
2
3
4
5
6
7
7 rows selected.
SQL> select id from test_table where contains(text,'Hello\)World') > 0
2 /
ID
1
2
3
4
5
6
7
7 rows selected.
SQL> select id from test_table where contains(text,'Hello\[World') > 0
  2  /
        ID
         1
         2
         3
         4
         5
         6
         7
7 rows selected.
SQL> select id from test_table where contains(text,'Hello\]World') > 0
2 /
ID
1
2
3
4
5
6
7
7 rows selected.
You need to add ()[] as printjoins:
SQL> begin
  2    begin
  3      ctx_ddl.drop_preference('test_lexer');
  4    exception
  5      when others then null;
  6    end; 
  7    ctx_ddl.create_preference('test_lexer', 'BASIC_LEXER');
  8    ctx_ddl.set_attribute('test_lexer', 'printjoins', '()[]');
  9  end;
10  /
PL/SQL procedure successfully completed.
SQL> drop table test_table
  2  /
Table dropped.
SQL> create table test_table (id number,text blob)
  2  /
Table created.
SQL> insert into test_table values (1,utl_raw.cast_to_raw ('Hello World'))
  2  /
1 row created.
SQL> insert into test_table values (2,utl_raw.cast_to_raw ('Hello(World'))
  2  /
1 row created.
SQL> insert into test_table values (3,utl_raw.cast_to_raw ('Hello)World'))
  2  /
1 row created.
SQL> insert into test_table values (4,utl_raw.cast_to_raw ('Hello[World'))
  2  /
1 row created.
SQL> insert into test_table values (5,utl_raw.cast_to_raw ('Hello]World'))
  2  /
1 row created.
SQL> insert into test_table values (6,utl_raw.cast_to_raw ('Hello([World'))
  2  /
1 row created.
SQL> insert into test_table values (7,utl_raw.cast_to_raw ('Hello(_World'))
  2  /
1 row created.
SQL> create index test_table_idx on test_table (text) indextype is ctxsys.context
  2  parameters('lexer test_lexer')
  3  /
Index created.
SQL> select id from test_table where contains(text,'Hello World') > 0
  2  /
        ID
         1
SQL> select id from test_table where contains(text,'Hello\(World') > 0
  2  /
        ID
         2
SQL> select id from test_table where contains(text,'Hello\)World') > 0
  2  /
        ID
         3
SQL> select id from test_table where contains(text,'Hello\[World') > 0
  2  /
        ID
         4
SQL> select id from test_table where contains(text,'Hello\]World') > 0
  2  /
        ID
         5
SQL> SY.