d574a3af6d
This commit contains the entire btcdb repository along with several changes needed to move all of the files into the database directory in order to prepare it for merging. This does NOT update btcd or any of the other packages to use the new location as that will be done separately. - All import paths in the old btcdb test files have been changed to the new location - All references to btcdb as the package name have been chagned to database - The coveralls badge has been removed since it unfortunately doesn't support coverage of sub-packages This is ongoing work toward #214.
94 lines
2.4 KiB
Go
94 lines
2.4 KiB
Go
// Copyright (c) 2013-2014 Conformal Systems LLC.
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// Use of this source code is governed by an ISC
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// license that can be found in the LICENSE file.
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package database_test
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import (
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"fmt"
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"github.com/btcsuite/btcd/database"
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_ "github.com/btcsuite/btcd/database/memdb"
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"github.com/btcsuite/btcnet"
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"github.com/btcsuite/btcutil"
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)
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// This example demonstrates creating a new database and inserting the genesis
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// block into it.
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func ExampleCreateDB() {
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// Notice in these example imports that the memdb driver is loaded.
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// Ordinarily this would be whatever driver(s) your application
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// requires.
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// import (
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// "github.com/btcsuite/btcd/database"
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// _ "github.com/btcsuite/btcd/database/memdb"
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// )
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// Create a database and schedule it to be closed on exit. This example
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// uses a memory-only database to avoid needing to write anything to
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// the disk. Typically, you would specify a persistent database driver
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// such as "leveldb" and give it a database name as the second
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// parameter.
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db, err := database.CreateDB("memdb")
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if err != nil {
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fmt.Println(err)
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return
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}
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defer db.Close()
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// Insert the main network genesis block.
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genesis := btcutil.NewBlock(btcnet.MainNetParams.GenesisBlock)
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newHeight, err := db.InsertBlock(genesis)
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if err != nil {
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fmt.Println(err)
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return
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}
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fmt.Println("New height:", newHeight)
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// Output:
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// New height: 0
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}
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// exampleLoadDB is used in the example to elide the setup code.
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func exampleLoadDB() (database.Db, error) {
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db, err := database.CreateDB("memdb")
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if err != nil {
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return nil, err
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}
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// Insert the main network genesis block.
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genesis := btcutil.NewBlock(btcnet.MainNetParams.GenesisBlock)
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_, err = db.InsertBlock(genesis)
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if err != nil {
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return nil, err
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}
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return db, err
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}
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// This example demonstrates querying the database for the most recent best
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// block height and hash.
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func ExampleDb_newestSha() {
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// Load a database for the purposes of this example and schedule it to
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// be closed on exit. See the CreateDB example for more details on what
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// this step is doing.
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db, err := exampleLoadDB()
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if err != nil {
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fmt.Println(err)
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return
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}
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defer db.Close()
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latestHash, latestHeight, err := db.NewestSha()
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if err != nil {
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fmt.Println(err)
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return
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}
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fmt.Println("Latest hash:", latestHash)
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fmt.Println("Latest height:", latestHeight)
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// Output:
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// Latest hash: 000000000019d6689c085ae165831e934ff763ae46a2a6c172b3f1b60a8ce26f
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// Latest height: 0
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}
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