diff --git a/db/accessor.go b/db/accessor.go
new file mode 100644
index 0000000..f3b3e9b
--- /dev/null
+++ b/db/accessor.go
@@ -0,0 +1,18 @@
+package db
+
+type Block struct {
+	posx, posy, posz int
+	data             []byte
+	mtime            int64
+}
+
+type DBAccessor interface {
+	IsMigrated() (bool, error)
+	Migrate() error
+	FindLatestBlocks(time int64, limit int) []Block
+
+	//Block range lookup
+	FindBlocks(posx int, posz int, posystart int, posyend int) []Block
+	GetXRange(posystart int, posyend int) (int, int)
+	GetZRange(posystart int, posyend int) (int, int)
+}
diff --git a/db/sqlite.go b/db/sqlite.go
new file mode 100644
index 0000000..dfd46f3
--- /dev/null
+++ b/db/sqlite.go
@@ -0,0 +1,32 @@
+package db
+
+type Sqlite3Accessor struct {
+}
+
+func (db *Sqlite3Accessor) IsMigrated() (bool, error) {
+	return false, nil
+}
+
+func (db *Sqlite3Accessor) Migrate() error {
+	return nil
+}
+
+func (db *Sqlite3Accessor) FindLatestBlocks(time int64, limit int) []Block {
+	return make([]Block, 0)
+}
+
+func (db *Sqlite3Accessor) FindBlocks(posx int, posz int, posystart int, posyend int) []Block {
+	return make([]Block, 0)
+}
+
+func (db *Sqlite3Accessor) GetXRange(posystart int, posyend int) (int, int) {
+	return 0, 0
+}
+
+func (db *Sqlite3Accessor) GetZRange(posystart int, posyend int) (int, int) {
+	return 0, 0
+}
+
+func NewSqliteAccessor(filename string) {
+
+}