Performance difference in various Hibernate Queries on VarChar MsSql columns -


i have query in hibernate believe because of varchar , nvarchar discrepancies in driver , mssql discussed here getting hibernate , sql server play nice varchar , nvarchar. understand issue not hibernate confused way hibernate deals code below .

when ran queries below (using set parameter , without it), on db varchar column type column 'code' , found appending string in hql works lot faster setparameter(or criteria query should have been faster hql) .

query createquery = session.createquery("from abc code='"+substring+"'"); /*query createquery = session.createquery("from abc   code=:substring");                 createquery.setparameter("substring","test");*/                 return createquery.list();

please let me know how make difference.

the execution plan computed database different between 2 queries. similar problem described in this question, , dba told me same problem can appear oracle well.


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