休眠动态参数查询

Question

I have a query that need to use "dynamic" parameters set. But coundn´t realize how to do it, i tried to not add the where string but it gives me erros because the parameter is seted.

Any tips?

String queryS = "select object(c) from "
                           + entityClassName + " as c " +
                            "where 1 = 1" ;

            if(codigoPaciente.compareTo("") != 0)
            {
                queryS += " and c.CodigoDoPaciente =:paciente";
            }
            if(codServicoPrincipal.compareTo("") != 0)
                queryS += " and c.codigoServicoPrincipal =:servico";
            if(data != null)
                queryS += " and c.codigoServicoPrincipal =:data";
            if(TipoServico.compareTo("") != 0)
                queryS += " and c.codigoServicoPrincipal =:tipoServico";


            Query query = em.createQuery(queryS);
            query.setParameter("paciente", codigoPaciente);
            query.setParameter("codigoServicoPrincipal", codServicoPrincipal);
            query.setParameter("data", data);
            query.setParameter("tipoServico", TipoServico);


            return query.getResultList();

Answer 1

Rather than doing a bunch of string concatenation to create a query, the criteria API could be used to construct the query in a more "safe" manner. Then you could add the condition and the value in a single conditional check.

Answer 2

You are not setting your parameters inside if conditions... Maybe set the parameter for each string you concatenate?

if(codigoPaciente.compareTo("") != 0)
            {
                queryS += " and c.CodigoDoPaciente =:paciente";
            }

Query query = em.createQuery(queryS);

// etc etc...
if(codigoPaciente.compareTo("") != 0)
    query.setParameter("paciente", codigoPaciente);