Examples of org.teiid.query.sql.lang.From

org.teiid.query.sql.lang.From
Represents a FROM clause in a SELECT query. The from clause holds a set of FROM subclauses. Each FROM subclause can be either a single group ( {@link UnaryFromClause}) or a join predicate ( {@link JoinPredicate}).

        
        Query query = new Query();
        Select select = new Select();
        select.addSymbol(new AllSymbol());
        query.setSelect(select);
        From from = new From();
        UnaryFromClause ufc = new UnaryFromClause();
        ufc.setGroup(new GroupSymbol("t1")); //$NON-NLS-1$
        ufc.setOptional(true);
        from.addClause(ufc); 
        from.addGroup(new GroupSymbol("t2")); //$NON-NLS-1$
        query.setFrom(from);           


        TestParser.helpTest(sql, "SELECT * FROM /*+ optional */ t1, t2", query);         //$NON-NLS-1$
    }

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        Query query = new Query();
        Select select = new Select();
        select.addSymbol(new AllSymbol());
        query.setSelect(select);
        From from = new From();
        UnaryFromClause ufc = new UnaryFromClause();
        ufc.setGroup(new GroupSymbol("t1")); //$NON-NLS-1$
        ufc.setOptional(true);
        from.addClause(ufc); 
        from.addGroup(new GroupSymbol("t2")); //$NON-NLS-1$
        query.setFrom(from);           


        TestParser.helpTest(sql, "SELECT * FROM /*+ optional */ t1, t2", query);         //$NON-NLS-1$
    }

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        Query query = new Query();
        Select select = new Select();
        select.addSymbol(new AllSymbol());
        query.setSelect(select);
        From from = new From();
        from.addGroup(new GroupSymbol("t1")); //$NON-NLS-1$
        UnaryFromClause ufc = new UnaryFromClause();
        ufc.setGroup(new GroupSymbol("t2")); //$NON-NLS-1$
        ufc.setOptional(true);
        from.addClause(ufc); 
        query.setFrom(from);           


        TestParser.helpTest(sql, "SELECT * FROM t1, /*+ optional */ t2", query);         //$NON-NLS-1$
    }

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        Query query = new Query();
        Select select = new Select();
        select.addSymbol(new AllSymbol());
        query.setSelect(select);
        From from = new From();
        UnaryFromClause ufc = new UnaryFromClause();
        ufc.setGroup(new GroupSymbol("a", "t1")); //$NON-NLS-1$ //$NON-NLS-2$
        ufc.setOptional(true);
        from.addClause(ufc); 
        from.addGroup(new GroupSymbol("t2")); //$NON-NLS-1$
        query.setFrom(from);           


        TestParser.helpTest(sql, "SELECT * FROM /*+ optional */ t1 AS a, t2", query);         //$NON-NLS-1$
    }

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        Query query = new Query();
        Select select = new Select();
        select.addSymbol(new AllSymbol());
        query.setSelect(select);
        From from = new From();
        from.addGroup(new GroupSymbol("t1")); //$NON-NLS-1$
        UnaryFromClause ufc = new UnaryFromClause();
        ufc.setGroup(new GroupSymbol("a", "t2")); //$NON-NLS-1$ //$NON-NLS-2$
        ufc.setOptional(true);
        from.addClause(ufc); 
        query.setFrom(from);           


        TestParser.helpTest(sql, "SELECT * FROM t1, /*+ optional */ t2 AS a", query);         //$NON-NLS-1$
    }

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        Query query = new Query();
        Select select = new Select();
        select.addSymbol(new AllSymbol());
        query.setSelect(select);
        From from = new From();
        
        Query query2 = new Query();
        select = new Select();
        select.addSymbol(new AllSymbol());
        query2.setSelect(select);
        From from2 = new From();
        from2.addGroup(new GroupSymbol("t1")); //$NON-NLS-1$
        from2.addGroup(new GroupSymbol("t2")); //$NON-NLS-1$
        query2.setFrom(from2);   
        
        SubqueryFromClause sfc = new SubqueryFromClause("x", query2);//$NON-NLS-1$
        sfc.setOptional(true);
        from.addGroup(new GroupSymbol("t1")); //$NON-NLS-1$

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        Query query = new Query();
        Select select = new Select();
        select.addSymbol(new AllSymbol());
        query.setSelect(select);
        From from = new From();
        
        Query query2 = new Query();
        select = new Select();
        select.addSymbol(new ElementSymbol("a"));//$NON-NLS-1$
        From from2 = new From();
        from2.addGroup(new GroupSymbol("t1")); //$NON-NLS-1$
        from2.addGroup(new GroupSymbol("t2")); //$NON-NLS-1$
        query2.setSelect(select);
        query2.setFrom(from2);   
        
        UnaryFromClause ufc = new UnaryFromClause();
        ufc.setGroup(new GroupSymbol("t1")); //$NON-NLS-1$

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        Query query = new Query();
        Select select = new Select();
        select.addSymbol(new ElementSymbol("b"));//$NON-NLS-1$
        query.setSelect(select);
        From from = new From(); 
        
        UnaryFromClause ufc = new UnaryFromClause();
        ufc.setGroup(new GroupSymbol("t2")); //$NON-NLS-1$ 
        
        UnaryFromClause ufc2 = new UnaryFromClause();
        ufc2.setGroup(new GroupSymbol("t3")); //$NON-NLS-1$
        
        List criteria = new ArrayList();
        criteria.add(new CompareCriteria(new ElementSymbol("t2.a"), AbstractCompareCriteria.EQ, new ElementSymbol("t3.a")));//$NON-NLS-1$//$NON-NLS-2$
        JoinPredicate joinPredicate = new JoinPredicate(ufc, ufc2, JoinType.JOIN_INNER, criteria);
        joinPredicate.setOptional(true);


        UnaryFromClause ufc3 = new UnaryFromClause();
        ufc3.setGroup(new GroupSymbol("t1")); //$NON-NLS-1$ 
        from.addClause(ufc3);
        from.addClause(joinPredicate);
        query.setFrom(from);           


        TestParser.helpTest(sql, "SELECT b FROM t1, /*+ optional */ (t2 INNER JOIN t3 ON t2.a = t3.a)", query);         //$NON-NLS-1$
    }

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        Query query = new Query();
        Select select = new Select();
        select.addSymbol(new ElementSymbol("b"));//$NON-NLS-1$
        query.setSelect(select);
        From from = new From(); 
        
        
        Query query2 = new Query();
        select = new Select();
        select.addSymbol(new AllSymbol());
        From from2 = new From();
        from2.addGroup(new GroupSymbol("t1")); //$NON-NLS-1$
        from2.addGroup(new GroupSymbol("t2")); //$NON-NLS-1$
        query2.setSelect(select);
        query2.setFrom(from2);
        SubqueryFromClause sfc = new SubqueryFromClause("x", query2);//$NON-NLS-1$
        sfc.setOptional(true);

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        Query query = new Query();
        Select select = new Select();
        select.addSymbol(new ElementSymbol("b"));//$NON-NLS-1$
        query.setSelect(select);
        From from = new From(); 
        
        UnaryFromClause ufc = new UnaryFromClause();
        ufc.setGroup(new GroupSymbol("t1")); //$NON-NLS-1$ 
        
        UnaryFromClause ufc2 = new UnaryFromClause();
        ufc2.setGroup(new GroupSymbol("t2")); //$NON-NLS-1$
        ufc2.setOptional(true);
        
        List criteria = new ArrayList();
        criteria.add(new CompareCriteria(new ElementSymbol("t1.a"), AbstractCompareCriteria.EQ, new ElementSymbol("t2.a")));//$NON-NLS-1$//$NON-NLS-2$
        JoinPredicate joinPredicate = new JoinPredicate(ufc, ufc2, JoinType.JOIN_LEFT_OUTER, criteria);


        UnaryFromClause ufc3 = new UnaryFromClause();
        ufc3.setGroup(new GroupSymbol("t3")); //$NON-NLS-1$
        ufc3.setOptional(true);


        criteria = new ArrayList();
        criteria.add(new CompareCriteria(new ElementSymbol("t1.a"), AbstractCompareCriteria.EQ, new ElementSymbol("t3.a")));//$NON-NLS-1$//$NON-NLS-2$
        JoinPredicate joinPredicate2 = new JoinPredicate(joinPredicate, ufc3, JoinType.JOIN_LEFT_OUTER, criteria);


        from.addClause(joinPredicate2);
        query.setFrom(from);           


        TestParser.helpTest(sql, "SELECT b FROM (t1 LEFT OUTER JOIN /*+ optional */ t2 ON t1.a = t2.a) LEFT OUTER JOIN /*+ optional */ t3 ON t1.a = t3.a", query);         //$NON-NLS-1$
    }

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