@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 testSplitSubQuery() throws Exception {
Connection con = getTestDbConnection();
DataContext dc = new JdbcDataContext(con);
Schema schema = dc.getDefaultSchema();
Table employeesTable = schema.getTableByName("EMPLOYEES");
Table customersTable = schema.getTableByName("CUSTOMERS");
Query sq = new Query().from(employeesTable, "e").from(customersTable, "c");
SelectItem empSelectItem = new SelectItem(employeesTable.getColumns()[0]);
SelectItem custSelectItem = new SelectItem(customersTable.getColumns()[0]);
sq.select(empSelectItem, custSelectItem);
assertEquals(
"SELECT e._EMPLOYEENUMBER_, c._CUSTOMERNUMBER_ FROM PUBLIC._EMPLOYEES_ e, PUBLIC._CUSTOMERS_ c",
sq.toString().replace('\"', '_'));
Query q = new Query();
FromItem sqItem = new FromItem(sq).setAlias("sq");
custSelectItem.setAlias("c_num");
empSelectItem.setAlias("e_num");
q.from(sqItem);
q.select(new SelectItem(custSelectItem, sqItem), new SelectItem(empSelectItem, sqItem));
assertEquals(
"SELECT sq.c_num, sq.e_num FROM (SELECT e._EMPLOYEENUMBER_ AS e_num, c._CUSTOMERNUMBER_ AS c_num FROM PUBLIC._EMPLOYEES_ e, PUBLIC._CUSTOMERS_ c) sq",
q.toString().replace('\"', '_'));
QuerySplitter qs = new QuerySplitter(dc, q);
assertEquals(2806, qs.getRowCount());
List<Query> splitQueries = qs.setMaxRows(1000).splitQuery();
assertSameCount(dc, qs, splitQueries);
assertEquals(5, splitQueries.size());
assertEquals("[793, 610, 366, 714, 323]", Arrays.toString(getCounts(dc, splitQueries)));
splitQueries = qs.setMaxRows(2000).splitQuery();
assertSameCount(dc, qs, splitQueries);
assertEquals(2, splitQueries.size());
assertEquals("[1403, 1403]", Arrays.toString(getCounts(dc, splitQueries)));
DataSet data = qs.executeQueries();
int count = 0;
while (data.next()) {
if (count == 2) {
assertEquals("Row[values=[114, 1002]]", data.getRow().toString());
}
count++;
}
data.close();
assertEquals(2806, count);
}