querydsl/querydsl-sql/src/main/java/com/mysema/query/sql/SQLGrammar.java

/*
 * Copyright (c) 2009 Mysema Ltd.
 * All rights reserved.
 * 
 */
package com.mysema.query.sql;

import com.mysema.query.types.Grammar;
import com.mysema.query.types.SubQuery;
import com.mysema.query.types.expr.EBoolean;
import com.mysema.query.types.expr.Expr;
import com.mysema.query.types.operation.Ops;

/**
 * SqlGrammar provides SQL specific extensions to the general Querydsl Grammar
 * 
 * @author tiwe
 * @version $Id$
 */
public class SQLGrammar extends Grammar {

    public static <A> SubQuery<Object, A> select(Expr<A> select) {
        return new SubQuery<Object, A>(select);
    }

    public static SubQuery<Object, Object[]> select(Expr<?>... select) {
        return new SubQuery<Object, Object[]>().select(select);
    }

    public static EBoolean exists(SubQuery<Object, ?> sq) {
        return operationFactory.createBoolean(Ops.EXISTS, sq);
    }

}