JPA2: Case-insensitive like matching anywhere

Question

I have been using Hibernate Restrictions in JPA 1.0 ( Hibernate driver ). There is defined Restrictions.ilike(\"column\",\"keyword\", MatchMode.ANYWHERE) which

Answer 1

Easier and more efficient to enforce case insensitity within the database than JPA.

1. Under the SQL 2003, 2006, 2008 standards, can do this by adding COLLATE SQL_Latin1_General_CP1_CI_AS OR COLLATE latin1_general_cs to the following:

   • Column Definition

     CREATE TABLE  (
         [DEFAULT...] 
                                 [NOT NULL|UNIQUE|PRIMARY KEY|REFERENCES...]
                                 [COLLATE ], 
       ...
     )
     
     Domain Definition
     
     CREATE DOMAIN  [ AS ] 
       [ DEFAULT ... ] [ CHECK ... ] [ COLLATE  ]
     
     Character Set Definition
     
     CREATE CHARACTER SET 
     [ AS ] GET  [ COLLATE  ]
     
     
     
     For full description of above refer: 
     http://savage.net.au/SQL/sql-2003-2.bnf.html#column%20definition
     http://dev.mysql.com/doc/refman/5.1/en/charset-table.html
     http://msdn.microsoft.com/en-us/library/ms184391.aspx
     In Oracle, can set NLS Session/Configuration parameters
     
      SQL> ALTER SESSION SET NLS_COMP=LINGUISTIC;
      SQL> ALTER SESSION SET NLS_SORT=BINARY_CI;
      SQL> SELECT ename FROM emp1 WHERE ename LIKE 'McC%e';
     
      ENAME
      ----------------------
      McCoye
      Mccathye
     
     
     Or, in init.ora (or OS-specific name for initialization parameter file):
     
     NLS_COMP=LINGUISTIC
     NLS_SORT=BINARY_CI
     
     
     Binary sorts can be case-insensitive or accent-insensitive. When you specify BINARY_CI as a value for NLS_SORT, it designates a sort that is accent-sensitive and case-insensitive. BINARY_AI designates an accent-insensitive and case-insensitive binary sort. You may want to use a binary sort if the binary sort order of the character set is appropriate for the character set you are using.
     Use the NLS_SORT session parameter to specify a case-insensitive or accent-insensitive sort:
     
     Append _CI to a sort name for a case-insensitive sort.
     Append _AI to a sort name for an accent-insensitive and case-insensitive sort. 
     
     
     For example, you can set NLS_SORT to the following types of values:
     
     FRENCH_M_AI
     XGERMAN_CI
     
     
     Setting NLS_SORT to anything other than BINARY [with optional _CI or _AI] causes a sort to use a full table scan, regardless of the path chosen by the optimizer. BINARY is the exception because indexes are built according to a binary order of keys. Thus the optimizer can use an index to satisfy the ORDER BY clause when NLS_SORT is set to BINARY. If NLS_SORT is set to any linguistic sort, the optimizer must include a full table scan and a full sort in the execution plan.
     
     Or, if NLS_COMP is set to LINGUISTIC, as above, then sort settings can be applied locally to indexed columns, rather than globally across the database:
     
     CREATE INDEX emp_ci_index ON emp (NLSSORT(emp_name, 'NLS_SORT=BINARY_CI'));
     
     
     Reference: ORA 11g Linguistic Sorting and String Searching
                ORA 11g Setting Up a Globalization Support Environment
     
         
     
                  
     
                                                             
                 
                 
     
                   
                     
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