Examples of org.datanucleus.query.expression.ClassExpression

Package org.datanucleus.query.expression

Examples of org.datanucleus.query.expression.ClassExpression

org.datanucleus.query.expression.ClassExpression
Expression representing a candidate in a FROM clause. This is used in JPQL where we have a "from" clause like
```
 SELECT ... FROM Product p JOIN p.reviews r
```
so the ClassExpression is for alias "p" of type Product. The class name is stored in the Symbol, keyed by this alias. Can have a JoinExpression to its right.

            // Process all ClassExpression(s) in the FROM, adding joins to the statement as required
            compileComponent = CompilationComponent.FROM;
            Expression[] fromExprs = compilation.getExprFrom();
            for (int i=0;i<fromExprs.length;i++)
            {
                ClassExpression clsExpr = (ClassExpression)fromExprs[i];
                compileFromClassExpression(clsExpr);
            }
            compileComponent = null;
        }
    }

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                            symtbl.addSymbol(new PropertySymbol(frmJoin.getAlias(), frmJoinCls));
                        }
                    }
                }


                ClassExpression clsExpr = (ClassExpression)frm.getQueryExpression(true);
                clsExpr.bind(symtbl);
                fromExprs[i++] = clsExpr;
            }


            org.datanucleus.query.expression.Expression filterExpr = null;
            if (filter != null)

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     */
    public org.datanucleus.query.expression.Expression getQueryExpression(boolean from)
    {
        if (from)
        {
            ClassExpression expr = new ClassExpression(getAlias());
            if (joins != null && !joins.isEmpty())
            {
                List tuples = new ArrayList();
                tuples.add(getAlias());

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Related Classes of org.datanucleus.query.expression.ClassExpression

org.datanucleus.api.jpa.criteria.CriteriaQueryImpl

org.datanucleus.api.jpa.criteria.FromImpl

org.datanucleus.store.rdbms.query.QueryToSQLMapper

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