init

.gitignore

@@ -0,0 +1,4 @@
+data/*
+go.sum
+*.exe
+leveldb-demo

go.mod

@@ -0,0 +1,8 @@
+module myschools.me/suguo/leveldb-demo
+
+go 1.18
+
+require (
+	github.com/golang/snappy v0.0.4 // indirect
+	github.com/syndtr/goleveldb v1.0.0 // indirect
+)

main.go

@@ -0,0 +1,37 @@
+package main
+
+import (
+	"fmt"
+	"log"
+
+	"github.com/syndtr/goleveldb/leveldb"
+	"github.com/syndtr/goleveldb/leveldb/opt"
+)
+
+func main() {
+	db, err := leveldb.OpenFile("./data", nil)
+	if err != nil {
+		log.Fatal(err)
+	}
+	defer db.Close()
+	for i := 0; i < 50; i++ {
+		if err := db.Put([]byte(fmt.Sprintf("hello %d", i)), []byte("a hello world."), nil); err != nil {
+			log.Fatal(err)
+		}
+	}
+
+	ret, err := db.Has([]byte("hello 49"), &opt.ReadOptions{
+		DontFillCache: false,
+		Strict:        0,
+	})
+	if err != nil {
+		log.Fatal(err)
+	}
+	fmt.Println(ret)
+
+	val, err := db.Get([]byte("hello 4"), nil)
+	if err != nil {
+		log.Fatal(err)
+	}
+	fmt.Println(string(val))
+}