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From Jakob Braeuchi <jbraeu...@gmx.ch>
Subject Proposal to support ESCAPE for Like-Criteria
Date Sat, 21 Feb 2004 14:43:49 GMT
hi all,

i had a long discussion with paul r. nase about like criteria containing escaped 
wildcards (example: first name like 'h%\%' escape '\' looks for firstname 
starting with 'h' and ending with '%'). for details see:


ojb currently does not properly support escaping of wildcards. while 
experimenting with this feature i found that we have some dbms-dependent problems:

1.) escape character \ is the default in mysql so escape '\' is not accepted. 
we'd need '\\'
2.) replacing wildcards *, ? by %, _ does not work for ms-access.
3.) escaping wildcards is different in ms-access

so i propose to use a manual escaping in like-criteria without replacing 
wildcards. the user will have to provide the escape clause for the like-criteria:

addLike(attribute, criteria, escapeClause);
addLike("firstname", "h%\\%", "escape '\\'");

ms_access: addLike("firstname", "h*[*]");

the escape clause will be appended to the like-clause when building the sql.
i'll implement a dedicated LikeCriteria to support escaping.

what do you think about this ?


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