Examples of org.datanucleus.query.expression.JoinExpression

Package org.datanucleus.query.expression

Examples of org.datanucleus.query.expression.JoinExpression

org.datanucleus.query.expression.JoinExpression
Expression representing a join between a candidate class, and the class of a field of the first class. An example is in JPQL where we have a "from" clause like
```
SELECT ... FROM Product p JOIN p.reviews r
```
so the join between "Product p" and "Review r" using "p.reviews". Can have a JoinExpression to its right.

        SQLTable sqlTbl = candSqlTbl;
        while (rightExpr != null)
        {
            if (rightExpr instanceof JoinExpression)
            {
                JoinExpression joinExpr = (JoinExpression)rightExpr;
                JoinType joinType = joinExpr.getType();
                String joinAlias = joinExpr.getAlias();
                PrimaryExpression joinPrimExpr = joinExpr.getPrimaryExpression();


                Iterator<String> iter = joinPrimExpr.getTuples().iterator();
                String rootId = iter.next();
                String joinTableGroupName = null;
                if (rootId.equalsIgnoreCase(candidateAlias))

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                    }


                    Attribute attr = join.getAttribute();
                    tuples.add(attr.getName());
                    PrimaryExpression primExpr = new PrimaryExpression(new ArrayList(tuples));
                    JoinExpression joinExpr = new JoinExpression(primExpr, join.getAlias(), jt);
                    if (currentExpr instanceof ClassExpression)
                    {
                        ((ClassExpression)currentExpr).setJoinExpression(joinExpr);
                    }
                    else
                    {
                        ((JoinExpression)currentExpr).setJoinExpression(joinExpr);
                    }


                    currentExpr = joinExpr;
                }
            }


            if (fetchJoins != null && !fetchJoins.isEmpty())
            {
                List tuples = new ArrayList();
                tuples.add(getAlias());


                Iterator<Fetch<X, ?>> iter = fetchJoins.iterator();
                Expression currentExpr = expr;
                while (iter.hasNext())
                {
                    Fetch<X, ?> join = iter.next();
                    org.datanucleus.query.expression.JoinExpression.JoinType jt = org.datanucleus.query.expression.JoinExpression.JoinType.JOIN_INNER;
                    if (join.getJoinType() == JoinType.LEFT)
                    {
                        jt = org.datanucleus.query.expression.JoinExpression.JoinType.JOIN_LEFT_OUTER;
                    }
                    else if (join.getJoinType() == JoinType.RIGHT)
                    {
                        jt = org.datanucleus.query.expression.JoinExpression.JoinType.JOIN_RIGHT_OUTER;
                    }


                    Attribute attr = join.getAttribute();
                    tuples.add(attr.getName());
                    PrimaryExpression primExpr = new PrimaryExpression(new ArrayList(tuples));
                    JoinExpression joinExpr = new JoinExpression(primExpr, null, jt);
                    if (currentExpr instanceof ClassExpression)
                    {
                        ((ClassExpression)currentExpr).setJoinExpression(joinExpr);
                    }
                    else

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    return (keysOnly ? ResultType.KEYS_ONLY : ResultType.ENTITY);
  }


  private void processFromExpression(QueryData qd, Expression expr) {
    if (expr instanceof JoinExpression) {
      JoinExpression joinExpr = (JoinExpression) expr;
      if (joinExpr.getType() != JoinExpression.JoinType.JOIN_INNER &&
          joinExpr.getType() != JoinExpression.JoinType.JOIN_INNER_FETCH) {
        throw new UnsupportedDatastoreFeatureException("Cannot fulfill outer join queries.");
      }
      qd.joinOrderExpression = createJoinOrderExpression(joinExpr.getPrimaryExpression());
    }
    if (expr.getLeft() != null) {
      processFromExpression(qd, expr.getLeft());
    }
    if (expr.getRight() != null) {

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  }




  private void processFromExpression(QueryData qd, Expression expr) {
    if (expr instanceof JoinExpression) {
      JoinExpression joinExpr = (JoinExpression) expr;
      if (joinExpr.getType() != JoinExpression.JoinType.JOIN_INNER &&
          joinExpr.getType() != JoinExpression.JoinType.JOIN_INNER_FETCH) {
        throw new UnsupportedDatastoreFeatureException("Cannot fulfill outer join queries.");
      }
      qd.joinOrderExpression = createJoinOrderExpression(joinExpr.getPrimaryExpression());
    }
    if (expr.getLeft() != null) {
      processFromExpression(qd, expr.getLeft());
    }
    if (expr.getRight() != null) {

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  }




  private void processFromExpression(QueryData qd, Expression expr) {
    if (expr instanceof JoinExpression) {
      JoinExpression joinExpr = (JoinExpression) expr;
      if (joinExpr.getType() != JoinExpression.JoinType.JOIN_INNER &&
          joinExpr.getType() != JoinExpression.JoinType.JOIN_INNER_FETCH) {
        throw new UnsupportedDatastoreFeatureException("Cannot fulfill outer join queries.");
      }
      qd.joinOrderExpression = createJoinOrderExpression(joinExpr.getPrimaryExpression());
    }
    if (expr.getLeft() != null) {
      processFromExpression(qd, expr.getLeft());
    }
    if (expr.getRight() != null) {

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  }




  private void processFromExpression(QueryData qd, Expression expr) {
    if (expr instanceof JoinExpression) {
      JoinExpression joinExpr = (JoinExpression) expr;
      if (joinExpr.getType() != JoinExpression.JoinType.JOIN_INNER &&
          joinExpr.getType() != JoinExpression.JoinType.JOIN_INNER_FETCH) {
        throw new UnsupportedDatastoreFeatureException("Cannot fulfill outer join queries.");
      }
      qd.joinOrderExpression = createJoinOrderExpression(joinExpr.getPrimaryExpression());
    }
    if (expr.getLeft() != null) {
      processFromExpression(qd, expr.getLeft());
    }
    if (expr.getRight() != null) {

View Full Code Here

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

com.google.appengine.datanucleus.query.DatastoreQuery

org.datanucleus.api.jpa.criteria.FromImpl

org.datanucleus.store.appengine.query.DatastoreQuery

org.datanucleus.store.rdbms.query.QueryToSQLMapper

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