Adding the challenge 0303

0303/table.go

@@ -0,0 +1,45 @@
+package db0303
+
+type DB struct {
+	KV KV
+}
+
+func (db *DB) Open() error  { return db.KV.Open() }
+func (db *DB) Close() error { return db.KV.Close() }
+
+func (db *DB) Select(schema *Schema, row Row) (ok bool, err error) {
+	key := row.EncodeKey(schema)
+	val, ok, err := db.KV.Get(key)
+	if err != nil || !ok {
+		return ok, err
+	}
+	if err = row.DecodeVal(schema, val); err != nil {
+		return false, err
+	}
+	return true, nil
+}
+
+func (db *DB) Insert(schema *Schema, row Row) (updated bool, err error) {
+	key := row.EncodeKey(schema)
+	val := row.EncodeVal(schema)
+	return db.KV.SetEx(key, val, ModeInsert)
+}
+
+func (db *DB) Upsert(schema *Schema, row Row) (updated bool, err error) {
+	key := row.EncodeKey(schema)
+	val := row.EncodeVal(schema)
+	return db.KV.SetEx(key, val, ModeUpsert)
+}
+
+func (db *DB) Update(schema *Schema, row Row) (updated bool, err error) {
+	key := row.EncodeKey(schema)
+	val := row.EncodeVal(schema)
+	return db.KV.SetEx(key, val, ModeUpdate)
+}
+
+func (db *DB) Delete(schema *Schema, row Row) (deleted bool, err error) {
+	key := row.EncodeKey(schema)
+	return db.KV.Del(key)
+}
+
+// QzBQWVJJOUhU https://trialofcode.org/