@Test
public void testGroupByQuery() throws Exception {
Table table = dataContext.getDefaultSchema().getTableByName(peopleIndexType);
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"));
q.orderBy("gender");
DataSet data = dataContext.executeQuery(q);
assertEquals(
"[peopletype.gender, MAX(peopletype.age), MIN(peopletype.age), COUNT(*) AS total, MIN(peopletype.id) AS firstId]",
Arrays.toString(data.getSelectItems()));
assertTrue(data.next());
assertEquals("Row[values=[female, 20, 17, 5, 5]]", data.getRow().toString());
assertTrue(data.next());
assertEquals("Row[values=[male, 19, 17, 4, 1]]", data.getRow().toString());
assertFalse(data.next());
}
public void testGroupByQuery() throws Exception {
Connection con = getTestDbConnection();
DataContext dc = new JdbcDataContext(con);
Schema schema = dc.getDefaultSchema();
Table employeesTable = schema.getTableByName("EMPLOYEES");
Table orderDetailsTable = schema.getTableByName("ORDERDETAILS");
Query q = new Query().from(employeesTable, "e").from(orderDetailsTable, "c");
q.select(orderDetailsTable.getColumns()[0])
.select(new SelectItem(FunctionType.MAX, employeesTable.getColumns()[0]));
q.groupBy(orderDetailsTable.getColumns()[0]);
assertEquals(
"SELECT c._ORDERNUMBER_, MAX(e._EMPLOYEENUMBER_) FROM PUBLIC._EMPLOYEES_ e, PUBLIC._ORDERDETAILS_ c GROUP BY c._ORDERNUMBER_",
q.toString().replace('\"', '_'));
QuerySplitter qs = new QuerySplitter(dc, q);
assertEquals(326, qs.getRowCount());
List<Query> splitQueries = qs.setMaxRows(250).splitQuery();
assertEquals(
"[SELECT c._ORDERNUMBER_, MAX(e._EMPLOYEENUMBER_) FROM PUBLIC._EMPLOYEES_ e, PUBLIC._ORDERDETAILS_ c WHERE (c._ORDERNUMBER_ < 10262 OR c._ORDERNUMBER_ IS NULL) GROUP BY c._ORDERNUMBER_, SELECT c._ORDERNUMBER_, MAX(e._EMPLOYEENUMBER_) FROM PUBLIC._EMPLOYEES_ e, PUBLIC._ORDERDETAILS_ c WHERE (c._ORDERNUMBER_ > 10262 OR c._ORDERNUMBER_ = 10262) GROUP BY c._ORDERNUMBER_]",
Arrays.toString(splitQueries.toArray()).replace('\"', '_'));
assertSameCount(dc, qs, splitQueries);
assertEquals(2, splitQueries.size());
assertEquals("[162, 164]", Arrays.toString(getCounts(dc, splitQueries)));
DataSet data = qs.executeQueries();
int count = 0;
while (data.next()) {
if (count == 2) {
assertEquals("Row[values=[10102, 1702]]", data.getRow().toString());
}
count++;
}
data.close();
assertEquals(326, count);
}