fix examples dir path

Author: roseduan

batch.go

@@ -16,12 +16,23 @@ import (
 // An error will be returned if you try to use Put or Delete method.
 //
 // If readonly is false, you can use Put and Delete method to write data to the batch.
-// The data will be written to the database when you call Commit method.
+// The data will be written to the database permanently after you call Commit method.
+//
+// NB. There can only one write batch and multi read-only batches at the same time.
+// And the db method is not allowed to use before the batch commit/rollback.
+// So a typical usage of Batch is like:
+//
+// batch := db.NewBatch(rosedb.DefaultBatchOptions)
+// batch.Put/batch.Get (and other methods)
+// /* 1. a new write batch is not allowed */
+// /* 2. invoke DB method is not allowed, like db.Put */
+// batch.Commit() or batch.Rollback()
 //
 // Batch is not a transaction, it does not guarantee isolation.
 // But it can guarantee atomicity, consistency and durability(if the Sync options is true).
 //
-// You must call Commit method to commit the batch, otherwise the DB will be locked.
+// You must call Commit or Rollback method after using the batch,
+// otherwise the DB will be locked in an unexpected way.
 type Batch struct {
 	db               *DB
 	pendingWrites    []*LogRecord     // save the data to be written
@@ -68,12 +79,11 @@ func newRecord() interface{} {
 	return &LogRecord{}
 }
 
-func (b *Batch) init(rdonly, sync bool, db *DB) *Batch {
+func (b *Batch) init(rdonly, sync bool, db *DB) {
 	b.options.ReadOnly = rdonly
 	b.options.Sync = sync
 	b.db = db
 	b.lock()
-	return b
 }
 
 func (b *Batch) reset() {

examples/batch/main.go

@@ -2,14 +2,20 @@ package main
 
 import (
 	"github.com/rosedblabs/rosedb/v2"
+	"runtime"
 )
 
 // this file shows how to use the batch operations of rosedb
 
 func main() {
 	// specify the options
 	options := rosedb.DefaultOptions
-	options.DirPath = "/tmp/rosedb_batch"
+	sysType := runtime.GOOS
+	if sysType == "windows" {
+		options.DirPath = "C:\\rosedb_batch"
+	} else {
+		options.DirPath = "/tmp/rosedb_batch"
+	}
 
 	// open a database
 	db, err := rosedb.Open(options)

examples/iterate/main.go

@@ -2,6 +2,7 @@ package main
 
 import (
 	"fmt"
+	"runtime"
 
 	"github.com/rosedblabs/rosedb/v2"
 )
@@ -11,7 +12,12 @@ import (
 func main() {
 	// specify the options
 	options := rosedb.DefaultOptions
-	options.DirPath = "/tmp/rosedb_iterate"
+	sysType := runtime.GOOS
+	if sysType == "windows" {
+		options.DirPath = "C:\\rosedb_iterate"
+	} else {
+		options.DirPath = "/tmp/rosedb_iterate"
+	}
 
 	// open a database
 	db, err := rosedb.Open(options)

examples/merge/main.go

@@ -3,6 +3,7 @@ package main
 import (
 	"github.com/rosedblabs/rosedb/v2"
 	"github.com/rosedblabs/rosedb/v2/utils"
+	"runtime"
 )
 
 // this file shows how to use the Merge feature of rosedb.
@@ -12,7 +13,12 @@ import (
 func main() {
 	// specify the options
 	options := rosedb.DefaultOptions
-	options.DirPath = "/tmp/rosedb_merge"
+	sysType := runtime.GOOS
+	if sysType == "windows" {
+		options.DirPath = "C:\\rosedb_merge"
+	} else {
+		options.DirPath = "/tmp/rosedb_merge"
+	}
 
 	// open a database
 	db, err := rosedb.Open(options)

examples/ttl/main.go

@@ -2,6 +2,7 @@ package main
 
 import (
 	"log"
+	"runtime"
 	"time"
 
 	"github.com/rosedblabs/rosedb/v2"
@@ -11,7 +12,12 @@ import (
 func main() {
 	// specify the options
 	options := rosedb.DefaultOptions
-	options.DirPath = "/tmp/rosedb_ttl"
+	sysType := runtime.GOOS
+	if sysType == "windows" {
+		options.DirPath = "C:\\rosedb_ttl"
+	} else {
+		options.DirPath = "/tmp/rosedb_ttl"
+	}
 
 	// open a database
 	db, err := rosedb.Open(options)

examples/watch/main.go

@@ -2,6 +2,7 @@ package main
 
 import (
 	"fmt"
+	"runtime"
 	"time"
 
 	"github.com/rosedblabs/rosedb/v2"
@@ -13,7 +14,12 @@ import (
 func main() {
 	// specify the options
 	options := rosedb.DefaultOptions
-	options.DirPath = "/tmp/rosedb_watch"
+	sysType := runtime.GOOS
+	if sysType == "windows" {
+		options.DirPath = "C:\\rosedb_watch"
+	} else {
+		options.DirPath = "/tmp/rosedb_watch"
+	}
 	options.WatchQueueSize = 1000
 
 	// open a database