Exemplo n.º 1
0
func ExampleKey() {
	var a1 int16 = 42
	var a2 float32 = 9.2

	x, _ := lex.Key(a1)
	y, _ := lex.Key(a2)
	z, _ := lex.Key(a1, a2)

	fmt.Printf("%v %v\n%v", x, y, z)

	// Output:
	// [128 42] [193 19 51 51]
	// [128 42 193 19 51 51]
}
Exemplo n.º 2
0
func TestKey_alias(t *testing.T) {
	var a1 aliasedInt = 42

	expected := make([]byte, 8)
	lex.PutInt(expected, int(a1))

	actual, err := lex.Key(a1)
	assert.Nil(t, err)
	assert.True(t, bytes.Equal(expected, actual))
}
Exemplo n.º 3
0
func TestKey(t *testing.T) {
	var a1 int16 = 42
	var a2 float32 = 9.2

	expected := make([]byte, 6)
	lex.PutInt16(expected, a1)
	lex.PutFloat32(expected[2:], a2)

	actual, err := lex.Key(a1, a2)
	assert.Nil(t, err)
	assert.True(t, bytes.Equal(expected, actual))
}
Exemplo n.º 4
0
func Example() {
	//from http://www.imdb.com/chart/top
	movies := []Movie{
		{1, "The Shawshank Redemption", 1994, 9.2},
		{2, "The Godfather", 1972, 9.2},
		{3, "The Godfather: Part II", 1974, 9.0},
		{4, "The Dark Knight", 2008, 8.9},
		{5, "12 Angry Men", 1957, 8.9},
		{6, "Schindler's List", 1993, 8.9},
		{7, "Pulp Fiction", 1994, 8.9},
		{8, "The Good, the Bad and the Ugly", 1966, 8.9},
		{9, "The Lord of the Rings: The Return of the King", 2003, 8.9},
		{10, "Fight Club", 1999, 8.8},
	}

	db := setup_bolt()
	defer clean_bolt(db)

	//index of {year,rating} => title
	db.Update(func(tx *bolt.Tx) error {
		b, _ := tx.CreateBucket([]byte("year,rating"))

		for _, m := range movies {
			k, _ := lex.Key(m.Year, m.Rating)
			v := []byte(m.Title)
			b.Put(k, v)
		}

		//range seek on first part of key
		//year >= 1950 && year < 1970
		min, _ := lex.Key(int16(1950))
		max, _ := lex.Key(int16(1970))
		c := b.Cursor()
		for k, v := c.Seek(min); bytes.Compare(k, max) <= 0; k, v = c.Next() {
			fmt.Printf("%v (%v)\n", string(v), lex.Int16(k))
		}

		//exact match on first + range seek on second part of key
		//year == 1994 && rating >= 9.0
		start, _ := lex.Key(int16(1994), float32(9.0))
		prefix, _ := lex.Key(int16(1994))
		c = b.Cursor()
		for k, v := c.Seek(start); bytes.HasPrefix(k, prefix); k, v = c.Next() {
			fmt.Println(string(v))
		}

		return nil
	})

	//index of {title} => rating
	db.Update(func(tx *bolt.Tx) error {
		b, _ := tx.CreateBucket([]byte("title"))

		for _, m := range movies {
			k, _ := lex.Key(m.Title)
			v := []byte(strconv.FormatFloat(float64(m.Rating), 'f', 1, 32))
			b.Put(k, v)
		}

		//title Equals "The Godfather"
		eq, _ := lex.Key("The Godfather")
		v := b.Get(eq)
		fmt.Println(string(v))

		//title HasPrefix "The Godfather"
		prefix := []byte("The Godfather") //note that this isn't NUL terminated
		c := b.Cursor()
		for k, v := c.Seek(prefix); bytes.HasPrefix(k, prefix); k, v = c.Next() {
			fmt.Printf("%v %v\n", lex.String(k), string(v))
		}

		return nil
	})

	// Output:
	//12 Angry Men (1957)
	//The Good, the Bad and the Ugly (1966)
	//The Shawshank Redemption
	//9.2
	//The Godfather 9.2
	//The Godfather: Part II 9.0
}
Exemplo n.º 5
0
func TestKey_invalidnilptr(t *testing.T) {
	var m map[string]int
	b, err := lex.Key(&m)
	assert.Nil(t, b)
	assert.NotNil(t, err)
}
Exemplo n.º 6
0
func TestKey_nilptr(t *testing.T) {
	var p *int = nil
	b, err := lex.Key(p)
	assert.Nil(t, b)
	assert.NotNil(t, err)
}
Exemplo n.º 7
0
func TestKey_nil(t *testing.T) {
	b, err := lex.Key(nil)
	assert.Nil(t, b)
	assert.NotNil(t, err)
}
Exemplo n.º 8
0
func TestKey_noargs(t *testing.T) {
	b, err := lex.Key()
	assert.Nil(t, b)
	assert.NotNil(t, err)
}