/**
* 针对一个带有级联关系的对象，实现指定选择列的查询
*
* @throws SQLException
*/
@Test
public void testAssignSelectColumn() throws SQLException {
db.createTable(Person.class);
Transaction db = this.db.startTransaction();
Person p = RandomData.newInstance(Person.class);
p.setGender("F");
p.setAge(19);
db.insert(p);
System.out.println("===========testAssignSelectColumn begin==============");
{
Query<Person> t1 = QB.create(Person.class);
// 只选择指定的列
t1.setCascadeViaOuterJoin(false);
Selects select = QB.selectFrom(t1);
// select.clearSelectItems();
select.guessColumn("schoolId");
// select.column(School.Field.name);
select.guessColumn("schoolName");
select.columns(t1, "name,age,cell");
select.column(t1, "id");
List<Person> result = db.select(t1);
LogUtil.show(result.get(0));
}
{
Query<Person> t1 = QB.create(Person.class);
// 只选择指定的列
// t1.setAutoOuterJoin(false);
Selects select = QB.selectFrom(t1);
// select.clearSelectItems();
select.guessColumn("schoolId");
// select.column(School.Field.name);
select.guessColumn("schoolName");
select.columns(t1, "name,age,cell");
select.column(t1, "id");
List<Person> result = db.select(t1);
LogUtil.show(result.get(0));
}
{
Query<Person> t1 = QB.create(Person.class);
// 只选择指定的列
// t1.setAutoOuterJoin(false);
Selects select = QB.selectFrom(t1);
// select.clearSelectItems();
select.guessColumn("schoolId");
// select.column(School.Field.name);
select.guessColumn("schoolName");
select.columns(t1, "name,age,cell");
select.column(t1, "id");
t1.setCascade(false);
List<Person> result = db.select(t1.getInstance());
LogUtil.show(result.get(0));
}
db.rollback(true);
System.out.println("===========result==============");
}
/**
* 支持Distinct的查询()
*
* @throws SQLException
*/
@Test
public void testSelectDistinct() throws SQLException {
Query<Person> t1 = QB.create(Person.class);
// 只选择指定的列
Selects select = QB.selectFrom(t1);
select.clearSelectItems();
select.setDistinct(true);
select.column(Person.Field.schoolId);
// select.guessColumn("schoolId",null);
select.columns(t1, "name,age,cell");
select.column(t1, "id");
t1.setCascade(false);
List<Person> map = db.select(t1.getInstance());
LogUtil.show(map.get(0));
}
/**
* 测试分组
*
* @throws SQLException
*/
@Test
public void testGroup() throws SQLException {
Transaction db = this.db.startTransaction();
Person p = RandomData.newInstance(Person.class);
p.setGender("F");
p.setAge(19);
db.insert(p);
Query<Person> t1 = QB.create(Person.class);
Selects select = QB.selectFrom(t1);
select.column(Person.Field.gender).group();
select.column(Person.Field.id).count().as("count");
select.column(Person.Field.age).min().as("minAge");
select.column(Person.Field.age).max().as("maxAge").having(Operator.GREAT, 0);
List<Map> map = db.selectAs(t1, Map.class);
db.rollback(true);
LogUtil.show(map);
}
/**
* 级联查询，驱动表的选择字段指定，其他表自动
*
* @throws SQLException
*/
@Test
public void testSelectColumnsInCascade() throws SQLException {
Query<Person> t1 = QB.create(Person.class);
// 只选择指定的列
Selects select = QB.selectFrom(t1);
select.column(t1, "schoolId");
select.columns(t1, "name,age,cell");
select.column(t1, "id");
List<Person> map = db.select(t1.getInstance());
Person p = map.get(0);
assertTrue(!p.getScores().isEmpty());
assertTrue(!p.getFriends().isEmpty());
for (Score score : p.getScores()) {
assertNotNull(score.getTestTime());
}
System.out.println("===========result:" + map.size() + "==============");
}