Golang Result.Count方法代码示例

// This test tries to use an empty filter and count how many elements were
// added into the artist collection.
func TestResultCount(t *testing.T) {

	var err error
	var res db.Result

	// Opening database.
	sess, err := db.Open(Adapter, settings)

	if err != nil {
		t.Fatal(err)
	}

	defer sess.Close()

	// We should close the database when it's no longer in use.
	artist, _ := sess.Collection("artist")

	res = artist.Find()

	// Counting all the matching rows.
	total, err := res.Count()

	if err != nil {
		t.Fatal(err)
	}

	if total == 0 {
		t.Fatalf("Should not be empty, we've just added some rows!")
	}

}

func (self *Dh) Delete() api.Err {

	var res db.Result
	var errs api.Err

	id := reflect.ValueOf(self.Model).Elem().FieldByName("Id").Interface().(int64)
	res = Collection.Find(db.Cond{"id": id})
	exist, err := res.Count()

	if exist == 0 {
		errs.Push(api.Msg{
			Field: "Delete: ",
			Error: api.ErrNoSuchRow,
		})
		return errs
	}

	err = res.Remove()

	if err == nil {
		return errs
	} else {
		errs.Push(api.Msg{
			Field: "Database delete  error: ",
			Error: err.Error(),
		})
	}

	return errs
}

func (self *Dh) RemoveForeverByConditions(conditions interface{}) api.Err {
	var res db.Result
	var errs api.Err
	res = Collection.Find(conditions)
	exist, err := res.Count()

	if exist == 0 {
		errs.Push(api.Msg{
			Field: "Delete: ",
			Error: api.ErrNoSuchRow,
		})
		return errs
	}

	err = res.Remove()

	if err == nil {
		return errs
	} else {
		errs.Push(api.Msg{
			Field: "Database delete  error: ",
			Error: err.Error(),
		})
	}
	return errs
}

// Attempts to use functions within database queries.
func TestFunction(t *testing.T) {
	var err error
	var res db.Result
	var sess db.Database
	var artist db.Collection
	var total uint64

	if sess, err = db.Open(Adapter, settings); err != nil {
		t.Fatal(err)
	}

	defer sess.Close()

	if artist, err = sess.Collection("artist"); err != nil {
		t.Fatal(err)
	}

	row_s := struct {
		Id   uint64
		Name string
	}{}

	res = artist.Find(db.Cond{"id NOT IN": []int{0, -1}})

	if err = res.One(&row_s); err != nil {
		t.Fatal(err)
	}

	if total, err = res.Count(); err != nil {
		t.Fatal(err)
	}

	if total != 3 {
		t.Fatalf("Expecting 3 items.")
	}

	res = artist.Find(db.Cond{"id": db.Func{"NOT IN", []int{0, -1}}})

	if err = res.One(&row_s); err != nil {
		t.Fatal(err)
	}

	if total, err = res.Count(); err != nil {
		t.Fatal(err)
	}

	if total != 3 {
		t.Fatalf("Expecting 3 items.")
	}

	res.Close()
}

func (self *Dh) FindAllSortBy(bar interface{}, sort string) api.Err {
	var res db.Result
	var errs api.Err
	res = Collection.Find().Sort(sort)
	count, _ := res.Count()
	if count == 0 {
		errs.Push(api.Msg{
			Field: "Select All",
			Error: api.ErrSelectAll,
		})
	}
	res.All(bar)
	return errs
}

// This test tries to add many different datatypes to a single row in a
// collection, then it tries to get the stored datatypes and check if the
// stored and the original values match.
func TestDataTypes(t *testing.T) {
	var res db.Result

	// Opening database.
	sess, err := db.Open(wrapperName, settings)

	if err != nil {
		t.Fatalf(err.Error())
	}

	// We should close the database when it's no longer in use.
	defer sess.Close()

	// Getting a pointer to the "data_types" collection.
	dataTypes, err := sess.Collection("data_types")
	dataTypes.Truncate()

	// Appending our test subject.
	id, err := dataTypes.Append(testValues)

	if err != nil {
		t.Fatalf(err.Error())
	}

	// Trying to get the same subject we added.
	res, err = dataTypes.Find(db.Cond{"id": id})

	if err != nil {
		t.Fatalf(err.Error())
	}

	exists, err := res.Count()

	if err != nil {
		t.Fatalf(err.Error())
	}

	if exists == 0 {
		t.Errorf("Expecting an item.")
	}

	// Trying to dump the subject into an empty structure of the same type.
	var item testValuesStruct
	res.One(&item)

	// The original value and the test subject must match.
	if reflect.DeepEqual(item, testValues) == false {
		t.Errorf("Struct is different.")
	}
}

// Attempts to add many different datatypes to a single row in a collection,
// then it tries to get the stored datatypes and check if the stored and the
// original values match.
func TestDataTypes(t *testing.T) {
	var res db.Result
	var sess db.Database
	var dataTypes db.Collection
	var err error
	var id interface{}
	var exists uint64

	if sess, err = db.Open(Adapter, settings); err != nil {
		t.Fatal(err)
	}

	defer sess.Close()

	// Getting a pointer to the "data_types" collection.
	if dataTypes, err = sess.Collection("data_types"); err != nil {
		t.Fatal(err)
	}

	// Removing all data.
	if err = dataTypes.Truncate(); err != nil {
		t.Fatal(err)
	}

	// Appending our test subject.
	if id, err = dataTypes.Append(testValues); err != nil {
		t.Fatal(err)
	}

	// Defining our set.
	res = dataTypes.Find(db.Cond{"id": id})

	if exists, err = res.Count(); err != nil {
		t.Fatal(err)
	}

	if exists == 0 {
		t.Fatalf("Expecting an item.")
	}

	// Trying to dump the subject into an empty structure of the same type.
	var item testValuesStruct

	res.One(&item)

	// The original value and the test subject must match.
	if reflect.DeepEqual(item, testValues) == false {
		t.Fatalf("Struct is different.")
	}
}

func (self *Dh) FindByConditions(conditions interface{}) (uint64, api.Err) {
	var errs api.Err
	var res db.Result
	res = Collection.Find(conditions)
	count, _ := res.Count()
	if count == 0 {
		errs.Push(api.Msg{
			Field: "Not found",
			Error: api.ErrNoSuchRow,
		})
		return count, errs
	}
	res.One(self.Model)
	return count, errs
}

func (self *Dh) FindByFieldValue(field string, value interface{}) (interface{}, api.Err) {
	var errs api.Err
	var res db.Result
	res = Collection.Find(db.Cond{field: value})
	count, _ := res.Count()

	if count == 0 {
		errs.Push(api.Msg{
			Field: "Not found",
			Error: api.ErrNoSuchRow,
		})
		return nil, errs
	}
	res.One(self.Model)
	return self.Model, errs
}

// Nombre: Exist
// Verifica que exista un elemento en nuestra base de datos
// La busca por su PK
func (self *Dh) Exist() bool {

	s := reflect.ValueOf(self.Model).Elem().Field(0)
	id := s.Interface().(int64)
	// change the field id
	// fmt.Println(s.Interface().(int64))
	// fmt.Println(reflect.ValueOf(self.Model).Elem().FieldByName("Id"),"data")
	// id := reflect.ValueOf(self.Model).Elem().FieldByName("Id").Interface().(int64)
	var res db.Result
	res = Collection.Find(db.Cond{"id": id})
	count, _ := res.Count()
	if count == 0 {
		return false
	}
	return true
}

// FindById
// Podemos hacer busquedas por PK Id este metodo
// recibe como parametro la pk de la tabla y trae todos sus
// elementos.
func (self *Dh) FindById(id int64) (interface{}, api.Err) {
	var errs api.Err
	var res db.Result
	res = Collection.Find(db.Cond{"id": id})
	count, _ := res.Count()

	if count == 0 {
		errs.Push(api.Msg{
			Field: "Not found",
			Error: api.ErrNoSuchRow,
		})
		return nil, errs
	}

	res.One(self.Model)

	return self.Model, errs
}

// Attempts to use functions within database queries.
func TestFunction(t *testing.T) {
	var err error
	var res db.Result
	var sess db.Database
	var artist db.Collection
	var total uint64
	var rowMap map[string]interface{}

	if sess, err = db.Open(Adapter, settings); err != nil {
		t.Fatal(err)
	}

	defer sess.Close()

	if artist, err = sess.Collection("artist"); err != nil {
		t.Fatal(err)
	}

	rowStruct := struct {
		ID   uint64
		Name string
	}{}

	res = artist.Find(db.Cond{"id NOT IN": []int{0, -1}})

	if err = res.One(&rowStruct); err != nil {
		t.Fatal(err)
	}

	if total, err = res.Count(); err != nil {
		t.Fatal(err)
	}

	if total != 4 {
		t.Fatalf("Expecting 4 items.")
	}

	// Testing conditions
	res = artist.Find(db.Cond{"id": db.Func{"NOT IN", []int{0, -1}}})

	if err = res.One(&rowStruct); err != nil {
		t.Fatal(err)
	}

	if total, err = res.Count(); err != nil {
		t.Fatal(err)
	}

	if total != 4 {
		t.Fatalf("Expecting 4 items.")
	}

	// Testing DISTINCT (function)
	res = artist.Find().Select(
		db.Func{`DISTINCT`, `name`},
	)

	if err = res.One(&rowMap); err != nil {
		t.Fatal(err)
	}

	if total, err = res.Count(); err != nil {
		t.Fatal(err)
	}

	if total != 4 {
		t.Fatalf("Expecting 4 items.")
	}

	// Testing DISTINCT (raw)
	res = artist.Find().Select(
		db.Raw{`DISTINCT(name)`},
	)

	if err = res.One(&rowMap); err != nil {
		t.Fatal(err)
	}

	if total, err = res.Count(); err != nil {
		t.Fatal(err)
	}

	if total != 4 {
		t.Fatalf("Expecting 4 items.")
	}

	res.Close()
}

func (self *Dh) FindAllCountFieldValue(field string, value interface{}) uint64 {
	var res db.Result
	res = Collection.Find(db.Cond{field: value})
	count, _ := res.Count()
	return count
}

func TestFibonacci(t *testing.T) {
	var err error
	var res db.Result
	var total uint64

	for _, wrapper := range wrappers {
		if settings[wrapper] == nil {
			t.Fatalf(`No such settings entry for wrapper %s.`, wrapper)
		} else {
			var sess db.Database

			sess, err = db.Open(wrapper, *settings[wrapper])
			if err != nil {
				t.Fatalf(`Test for wrapper %s failed: %q`, wrapper, err)
			}
			defer sess.Close()

			var col db.Collection
			col, err = sess.Collection("fibonacci")

			if err != nil {
				if wrapper == `mongo` && err == db.ErrCollectionDoesNotExist {
					// Expected error with mongodb.
				} else {
					t.Fatalf(`Could not use collection with wrapper %s: %q`, wrapper, err)
				}
			}

			// Adding some items.
			var i uint64
			for i = 0; i < 10; i++ {
				item := fibonacci{Input: i, Output: fib(i)}
				_, err = col.Append(item)
				if err != nil {
					t.Fatalf(`Could not append item with wrapper %s: %q`, wrapper, err)
				}
			}

			// Testing sorting by function.
			res = col.Find(
				// 5, 6, 7, 3
				db.Or{
					db.And{
						db.Cond{"input >=": 5},
						db.Cond{"input <=": 7},
					},
					db.Cond{"input": 3},
				},
			)

			// Testing sort by function.
			switch wrapper {
			case `postgresql`:
				res = res.Sort(db.Raw{`RANDOM()`})
			case `sqlite`:
				res = res.Sort(db.Raw{`RANDOM()`})
			case `mysql`:
				res = res.Sort(db.Raw{`RAND()`})
			}

			total, err = res.Count()

			if err != nil {
				t.Fatalf(`%s: %q`, wrapper, err)
			}

			if total != 4 {
				t.Fatalf("%s: Expecting a count of 4, got %d.", wrapper, total)
			}

			// Find() with IN/$in
			var whereIn db.Cond

			switch wrapper {
			case `mongo`:
				whereIn = db.Cond{"input": db.Func{"$in", []int{3, 5, 6, 7}}}
			default:
				whereIn = db.Cond{"input": db.Func{"IN", []int{3, 5, 6, 7}}}
			}

			res = col.Find(whereIn).Sort("input")

			total, err = res.Count()

			if err != nil {
				t.Fatalf(`%s: %q`, wrapper, err)
			}

			if total != 4 {
				t.Fatalf(`Expecting a count of 4.`)
			}

			res = res.Skip(1).Limit(2)

			for {
				var item fibonacci
				err = res.Next(&item)
				if err == nil {
					switch item.Input {
					case 5:
//.........这里部分代码省略.........

func TestSimpleCRUD(t *testing.T) {
	var err error

	var controlItem birthday

	for _, wrapper := range wrappers {
		if settings[wrapper] == nil {
			t.Fatalf(`No such settings entry for wrapper %s.`, wrapper)
		} else {

			var sess db.Database

			sess, err = db.Open(wrapper, *settings[wrapper])
			if err != nil {
				t.Fatalf(`Test for wrapper %s failed: %q`, wrapper, err)
			}

			defer sess.Close()

			born := time.Date(1941, time.January, 5, 0, 0, 0, 0, time.Local)

			controlItem = birthday{
				Name:   "Hayao Miyazaki",
				Born:   born,
				BornUT: &timeType{born},
			}

			col, err := sess.Collection(`birthdays`)

			if err != nil {
				if wrapper == `mongo` && err == db.ErrCollectionDoesNotExist {
					// Expected error with mongodb.
				} else {
					t.Fatalf(`Could not use collection with wrapper %s: %q`, wrapper, err)
				}
			}

			var id interface{}

			if id, err = col.Append(controlItem); err != nil {
				t.Fatalf(`Could not append item with wrapper %s: %q`, wrapper, err)
			}

			var res db.Result
			switch wrapper {
			case `mongo`:
				res = col.Find(db.Cond{"_id": id.(bson.ObjectId)})
			case `ql`:
				res = col.Find(db.Cond{"id()": id})
			default:
				res = col.Find(db.Cond{"id": id})
			}

			var total uint64
			total, err = res.Count()

			if total != 1 {
				t.Fatalf("%s: Expecting one row.", wrapper)
			}

			// No support for Marshaler and Unmarshaler is implemeted for QL and
			// MongoDB.
			if wrapper == `ql` || wrapper == `mongo` {
				continue
			}

			var testItem birthday
			err = res.One(&testItem)
			if err != nil {
				t.Fatalf("%s One(): %s", wrapper, err)
			}

			if reflect.DeepEqual(testItem, controlItem) == false {
				t.Errorf("%s: testItem: %v (ts: %v)\n", wrapper, testItem, testItem.BornUT.value.Unix())
				t.Errorf("%s: controlItem: %v (ts: %v)\n", wrapper, controlItem, controlItem.BornUT.value.Unix())
				t.Fatalf("%s: Structs are different", wrapper)
			}

			var testItems []birthday
			err = res.All(&testItems)
			if err != nil {
				t.Fatalf("%s All(): %s", wrapper, err)
			}

			if len(testItems) == 0 {
				t.Fatalf("%s All(): Expecting at least one row.", wrapper)
			}

			for _, testItem = range testItems {
				if reflect.DeepEqual(testItem, controlItem) == false {
					t.Errorf("%s: testItem: %v\n", wrapper, testItem)
					t.Errorf("%s: controlItem: %v\n", wrapper, controlItem)
					t.Fatalf("%s: Structs are different", wrapper)
				}
			}

			controlItem.Name = `宮崎駿`
			err = res.Update(controlItem)

			if err != nil {
//.........这里部分代码省略.........