1、查询所有
@Test public void query() throws Exception { final Query<Employee> query = datastore.createQuery(Employee.class); final List<Employee> list = query.asList(); list.forEach(e -> Console.log("{}", e)); }
输出:
Employee(id=5bcef23890c1d9280c07128e, name=小弟1, manager=null, directReports=[], salary=2000.0) Employee(id=5bcef23890c1d9280c07128f, name=小弟2, manager=null, directReports=[], salary=3000.0) Employee(id=5bcef23890c1d9280c071290, name=zuoys, manager=null, directReports=[Employee(id=5bcef23890c1d9280c07128e, name=小弟1, manager=null, directReports=[], salary=2000.0), Employee(id=5bcef23890c1d9280c07128f, name=小弟2, manager=null, directReports=[], salary=3000.0)], salary=10000.0) Employee(id=5bcef45d90c1d91d509941cd, name=小弟3有父, manager=Employee(id=5bcef23890c1d9280c071290, name=zuoys, manager=null, directReports=[Employee(id=5bcef23890c1d9280c07128e, name=小弟1, manager=null, directReports=[], salary=2000.0), Employee(id=5bcef23890c1d9280c07128f, name=小弟2, manager=null, directReports=[], salary=3000.0)], salary=10000.0), directReports=[], salary=22.0)
使用asList()
是可以的,但实际上,fetch()
通常是更好的选择。
2、条件过滤
//条件过滤-field @Test public void query2() throws Exception { List<Employee> list = datastore.createQuery(Employee.class) .field("salary").lessThanOrEq(22) .asList(); list.forEach(e -> Console.log("{}", e)); } //条件查询-filter @Test public void query3() throws Exception { List<Employee> list = datastore.createQuery(Employee.class) .filter("salary <=", 22) .asList(); list.forEach(e -> Console.log("{}", e)); }
使用filter比fiele更简洁,但要注意语法。