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Add bucket check to db.View in readme.md 

Add 'Assume bucket exists and has keys' comments on db.View calls
accessing bucket keys in examples of db.View in readme.md code examples.
Fixes #484
master
Peter Etelej 2016-01-09 09:34:55 +03:00
parent 25b28102db
commit 769f43bec3
1 changed files with 6 additions and 1 deletions
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7
README.md
View File

@ -348,7 +348,9 @@ iteration over these keys extremely fast. To iterate over keys we'll use a
```go
db.View(func(tx *bolt.Tx) error {
// Assume bucket exists and has keys
b := tx.Bucket([]byte("MyBucket"))
c := b.Cursor()
for k, v := c.First(); k != nil; k, v = c.Next() {
@ -389,6 +391,7 @@ To iterate over a key prefix, you can combine `Seek()` and `bytes.HasPrefix()`:
```go
db.View(func(tx *bolt.Tx) error {
// Assume bucket exists and has keys
c := tx.Bucket([]byte("MyBucket")).Cursor()
prefix := []byte("1234")
@ -408,7 +411,7 @@ date range like this:
```go
db.View(func(tx *bolt.Tx) error {
// Assume our events bucket has RFC3339 encoded time keys.
// Assume our events bucket exists and has RFC3339 encoded time keys.
c := tx.Bucket([]byte("Events")).Cursor()
// Our time range spans the 90's decade.
@ -432,7 +435,9 @@ all the keys in a bucket:
```go
db.View(func(tx *bolt.Tx) error {
// Assume bucket exists and has keys
b := tx.Bucket([]byte("MyBucket"))
b.ForEach(func(k, v []byte) error {
fmt.Printf("key=%s, value=%s\n", k, v)
return nil