Package org.apache.metamodel.query

Examples of org.apache.metamodel.query.Query.select()

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        Table table = dc.getDefaultSchema().getTableByName("csv_people.csv");

        Query q = new Query();
        q.from(table);
        q.where(new FilterItem(new SelectItem(table.getColumnByName("id")), OperatorType.EQUALS_TO, 1));
        q.select(table.getColumnByName("name"));
        DataSet data = dc.executeQuery(q);
        assertTrue(data.next());
        assertEquals("Row[values=[mike]]", data.getRow().toString());
        assertFalse(data.next());
    }
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        Table table = dc.getDefaultSchema().getTableByName("csv_people.csv");

        Query q = new Query();
        q.from(table);
        q.groupBy(table.getColumnByName("gender"));
        q.select(new SelectItem(table.getColumnByName("gender")),
                new SelectItem(FunctionType.MAX, table.getColumnByName("age")),
                new SelectItem(FunctionType.MIN, table.getColumnByName("age")), new SelectItem(FunctionType.COUNT, "*",
                        "total"), new SelectItem(FunctionType.MIN, table.getColumnByName("id")).setAlias("firstId"));
        DataSet data = dc.executeQuery(q);
        assertEquals(
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        assertEquals(1, data.size());
        Object[] row = data.get(0);
        assertEquals(1, row.length);
        assertEquals("[9]", Arrays.toString(row));

        q.select(table.getColumns()[0]);
        assertEquals("SELECT COUNT(*), csv_people.csv.id FROM resources.csv_people.csv", q.toString());
        data = dc.executeQuery(q).toObjectArrays();
        assertEquals(9, data.size());
        row = data.get(0);
        assertEquals(2, row.length);
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    public void testSimpleWhere() throws Exception {
        DataContext dc = getDataContext();
        Query q = new Query();
        q.from(table1);
        q.select(table1.getColumns());
        SelectItem countrySelectItem = q.getSelectClause().getSelectItem(
                table1.getColumnByName(COLUMN_CONTRIBUTOR_COUNTRY));
        q.where(new FilterItem(countrySelectItem, OperatorType.EQUALS_TO, "denmark"));

        DataSet data = dc.executeQuery(q);
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    public void testMaxRows() throws Exception {
        DataContext dc = getDataContext();
        Query q = new Query();
        q.from(table1);
        q.select(table1.getColumns());
        q.setMaxRows(3);
        DataSet data1 = dc.executeQuery(q);

        assertTrue(data1.next());
        assertEquals("Row[values=[1, kasper, denmark]]", data1.getRow().toString());
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        assertFalse(data1.next());
        data1.close();

        q = new Query();
        q.from(table1);
        q.select(table1.getColumns());
        q.setFirstRow(2);
        q.setMaxRows(2);
        DataSet data2 = dc.executeQuery(q);
        assertTrue(data2.next());
        assertEquals("Row[values=[2, asbjorn, denmark]]", data2.getRow().toString());
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        SelectItem s2 = new SelectItem(table2.getColumnByName(COLUMN_ROLE_ROLE_NAME));
        FromItem f1 = new FromItem(table1);
        FromItem f2 = new FromItem(table2);

        Query q = new Query();
        q.select(s1);
        q.select(s2);
        q.from(f1);
        q.from(f2);
        SelectItem s3 = new SelectItem(table1.getColumnByName(COLUMN_CONTRIBUTOR_CONTRIBUTOR_ID));
        SelectItem s4 = new SelectItem(table2.getColumnByName(COLUMN_ROLE_CONTRIBUTOR_ID));
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        FromItem f1 = new FromItem(table1);
        FromItem f2 = new FromItem(table2);

        Query q = new Query();
        q.select(s1);
        q.select(s2);
        q.from(f1);
        q.from(f2);
        SelectItem s3 = new SelectItem(table1.getColumnByName(COLUMN_CONTRIBUTOR_CONTRIBUTOR_ID));
        SelectItem s4 = new SelectItem(table2.getColumnByName(COLUMN_ROLE_CONTRIBUTOR_ID));
        q.where(new FilterItem(s3, OperatorType.EQUALS_TO, s4));
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        SelectItem s1 = new SelectItem(table1.getColumnByName(COLUMN_CONTRIBUTOR_NAME));
        SelectItem s2 = new SelectItem(table2.getColumnByName(COLUMN_ROLE_ROLE_NAME));
        FromItem fromItem = new FromItem(JoinType.INNER, table1.getRelationships(table2)[0]);

        Query q = new Query();
        q.select(s1);
        q.select(s2);
        q.from(fromItem);
        assertEquals(
                "SELECT contributor.name, role.name FROM MetaModelSchema.contributor INNER JOIN MetaModelSchema.role ON contributor.contributor_id = role.contributor_id",
                q.toString());
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        SelectItem s2 = new SelectItem(table2.getColumnByName(COLUMN_ROLE_ROLE_NAME));
        FromItem fromItem = new FromItem(JoinType.INNER, table1.getRelationships(table2)[0]);

        Query q = new Query();
        q.select(s1);
        q.select(s2);
        q.from(fromItem);
        assertEquals(
                "SELECT contributor.name, role.name FROM MetaModelSchema.contributor INNER JOIN MetaModelSchema.role ON contributor.contributor_id = role.contributor_id",
                q.toString());
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