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/chaincfg"
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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/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(chaincfg.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(chaincfg.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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