Package org.apache.metamodel.data

Examples of org.apache.metamodel.data.DataSet

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

        Query q = dc.query().from(table).as("t").select("name").and("age").where("age").in("18", "20").toQuery();
        assertEquals("SELECT t.name, t.age FROM resources.csv_people.csv t WHERE t.age IN ('18' , '20')", q.toSql());

        DataSet ds = dc.executeQuery(q);
        assertTrue(ds.next());
        assertEquals("Row[values=[mike, 18]]", ds.getRow().toString());
        assertTrue(ds.next());
        assertEquals("Row[values=[peter, 18]]", ds.getRow().toString());
        assertTrue(ds.next());
        assertEquals("Row[values=[barbara, barb, 18]]", ds.getRow().toString());
        assertTrue(ds.next());
        assertEquals("Row[values=[charlotte, 18]]", ds.getRow().toString());
        assertTrue(ds.next());
        assertEquals("Row[values=[hillary, 20]]", ds.getRow().toString());
        assertFalse(ds.next());

        ds.close();
    }
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            throw new IllegalArgumentException("No such POJO table: " + table.getName());
        }

        final SelectItem[] selectItems = MetaModelHelper.createSelectItems(columns);

        @SuppressWarnings({ "rawtypes", "unchecked" })
        DataSet dataSet = new PojoDataSet(pojoTable, selectItems);

        if (maxRows > 0) {
            dataSet = new MaxRowsDataSet(dataSet, maxRows);
        }
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        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(
                "[csv_people.csv.gender, MAX(csv_people.csv.age), MIN(csv_people.csv.age), COUNT(*) AS total, MIN(csv_people.csv.id) AS firstId]",
                Arrays.toString(data.getSelectItems()));

        String[] expectations = new String[] { "Row[values=[female, 20, 17, 5, 5]]", "Row[values=[male, 19, 17, 4, 1]]" };

        assertTrue(data.next());
        assertTrue(Arrays.asList(expectations).contains(data.getRow().toString()));
        assertTrue(data.next());
        assertTrue(Arrays.asList(expectations).contains(data.getRow().toString()));
        assertFalse(data.next());
    }
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    public void testMaterializeTable() throws Exception {
        File file = new File("src/test/resources/csv_people.csv");
        CsvDataContext dc = new CsvDataContext(file, new CsvConfiguration(1, false, false));
        Table table = dc.getSchemas()[0].getTables()[0];
        DataSet dataSet = dc.materializeMainSchemaTable(table, table.getColumns(), -1);
        assertNull(dataSet.getRow());
        assertTrue(dataSet.next());
        assertEquals("Row[values=[1, mike, male, 18]]", dataSet.getRow().toString());
        assertTrue(dataSet.next());
        assertEquals("Row[values=[2, michael, male, 19]]", dataSet.getRow().toString());
        assertTrue(dataSet.next());
        assertEquals("Row[values=[3, peter, male, 18]]", dataSet.getRow().toString());
        assertTrue(dataSet.next());
        assertTrue(dataSet.next());
        assertEquals("Row[values=[5, barbara, barb, female, 18]]", dataSet.getRow().toString());
        assertTrue(dataSet.next());
        assertTrue(dataSet.next());
        assertTrue(dataSet.next());
        assertTrue(dataSet.next());
        assertEquals("Row[values=[9, carrie, female, 17]]", dataSet.getRow().toString());
        assertFalse(dataSet.next());

        dataSet = dc.materializeMainSchemaTable(table, table.getColumns(), 1);
        assertTrue(dataSet.next());
        assertEquals("Row[values=[1, mike, male, 18]]", dataSet.getRow().toString());
        assertFalse(dataSet.next());
    }
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    }

    @Override
    public DataSet executeQuery(Query query) throws MetaModelException {
        query = _queryInterceptors.interceptAll(query);
        DataSet dataSet = _delegate.executeQuery(query);
        dataSet = _dataSetInterceptors.interceptAll(dataSet);
        return dataSet;
    }
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    }

    @Override
    public DataSet executeQuery(String queryString) throws MetaModelException {
        final Query query = parseQuery(queryString);
        final DataSet dataSet = executeQuery(query);
        return dataSet;
    }
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    public void testAlternativeDelimitors() throws Exception {
        File file = new File("src/test/resources/csv_semicolon_singlequote.csv");
        CsvDataContext dc = new CsvDataContext(file, semicolonConfiguration);
        Table table = dc.getSchemas()[0].getTables()[0];
        DataSet dataSet = dc.materializeMainSchemaTable(table, table.getColumns(), -1);
        assertTrue(dataSet.next());
        assertEquals("Row[values=[1, mike, male, 18]]", dataSet.getRow().toString());
        assertTrue(dataSet.next());
        assertEquals("Row[values=[2, michael, male, 19]]", dataSet.getRow().toString());
        assertTrue(dataSet.next());
        assertEquals("Row[values=[3, peter, male, 18]]", dataSet.getRow().toString());
        assertTrue(dataSet.next());
        assertTrue(dataSet.next());
        assertEquals("Row[values=[5, barbara; barb, female, 18]]", dataSet.getRow().toString());
        assertTrue(dataSet.next());
        assertTrue(dataSet.next());
        assertTrue(dataSet.next());
        assertTrue(dataSet.next());
        assertEquals("Row[values=[9, carrie, female, 17]]", dataSet.getRow().toString());
        assertFalse(dataSet.next());
        assertNull(dataSet.getRow());
    }
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    public void testMaxRows() throws Exception {
        File file = new File("src/test/resources/csv_semicolon_singlequote.csv");
        CsvDataContext dc = new CsvDataContext(file, semicolonConfiguration);
        Table table = dc.getDefaultSchema().getTables()[0];
        Query query = new Query().from(table).select(table.getColumns()).setMaxRows(5);
        DataSet dataSet = dc.executeQuery(query);

        TableModel tableModel = new DataSetTableModel(dataSet);
        assertEquals(5, tableModel.getRowCount());
    }
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        Table table = dc.getDefaultSchema().getTables()[0];
        Query q = dc.query().from(table).select(table.getColumnByName("name")).toQuery();
        q.setFirstRow(3);
        q.setMaxRows(2);

        DataSet ds;

        ds = dc.executeQuery(q);
        assertEquals(1, ds.getSelectItems().length);
        assertTrue(ds.next());
        assertEquals("peter", ds.getRow().getValue(0).toString());
        assertTrue(ds.next());
        assertEquals("bob", ds.getRow().getValue(0).toString());
        assertFalse(ds.next());
        ds.close();

        // try with iterator
        ds = dc.executeQuery(q);
        int i = 0;
        for (Row row : ds) {
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        assertEquals("[greeting, greeter]", Arrays.toString(table.getColumnNames()));
        assertEquals(10, table.getColumnByName("greeting").getColumnSize().intValue());
        assertEquals(10, table.getColumnByName("greeter").getColumnSize().intValue());

        Query q = dc.query().from(table).select(table.getColumns()).toQuery();
        DataSet ds = dc.executeQuery(q);

        assertTrue(ds.next());
        assertEquals("[hello, world]", Arrays.toString(ds.getRow().getValues()));
        assertTrue(ds.next());
        assertEquals("[hi, there]", Arrays.toString(ds.getRow().getValues()));
        assertTrue(ds.next());
        assertEquals("[howdy, partner]", Arrays.toString(ds.getRow().getValues()));
        assertFalse(ds.next());
    }
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Related Classes of org.apache.metamodel.data.DataSet

  • org.apache.metamodel.AbstractDataContext
  • org.apache.metamodel.CompositeDataContextTest
  • org.apache.metamodel.convert.ConvertedDataSetInterceptorTest
  • org.apache.metamodel.convert.Converters
  • org.apache.metamodel.convert.ConvertersTest
  • org.apache.metamodel.couchdb.CouchDbDataContextTest
  • org.apache.metamodel.couchdb.CouchDbRowDeletionBuilder
  • org.apache.metamodel.couchdb.CouchDbRowUpdationBuilder
  • org.apache.metamodel.csv.CsvBigFileMemoryTest
  • org.apache.metamodel.csv.CsvDataContextTest
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