Need to find Max Value in Liferay table using Service Builder -

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i have built liferay portlet using service builder , has 1 table. 1 of fields holds double value called 'zvalue'. need add -localserviceimpl.java file public method return maximum value found in field 'zvalue'. hoping there liferay class similar dynamicquery instead returns single value. know can return records , cycle through them myself maximum value, i'm sure there simpler way max value.

what have found in search of stackoverflow is:

dynamicquery query = dynamicqueryfactoryutil.forclass(classname); query.setprojection(projectionfactoryutil.max("zvalue"));

but didn't understand how return value dynamicquery returns list , not single value.

in following example, query journalarticle table find articles match criteria, , newest version of each of (the max).

as pankaj said, need create 2 dynamic queries. first 1 used specify need max returned:

dynamicquery subquery = dynamicqueryfactoryutil.forclass(journalarticle.class, "articlesub", portalclassloaderutil.getclassloader())             .add(propertyfactoryutil.forname("articleid").eqproperty("articleparent.articleid"))             .setprojection(projectionfactoryutil.max("id"));

articlesub alias assign query. projectionfactoryutil.max return max.

the second 1 actual query. take value returned first query:

dynamicquery query = dynamicqueryfactoryutil.forclass(journalarticle.class, "articleparent", portalclassloaderutil.getclassloader())             .add(propertyfactoryutil.forname("id").eq(subquery))             .add(propertyfactoryutil.forname("type").eq("slider"));

the execution of dynamicquery return list<journalarticle> matches returned generated sql sentence. 

list<journalarticle> mylist = journalarticlelocalserviceutil.dynamicquery(query);

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