diff --git a/src/db/db_format.rs b/src/db/db_format.rs
index d76deff60e31536f67446f5a2e59fec578630a11..d69d6265687a47973c3f9114a4e64aa87d637e0a 100644
--- a/src/db/db_format.rs
+++ b/src/db/db_format.rs
@@ -102,36 +102,36 @@ impl Default for ParsedInternalKey {
 }
 
 impl ParsedInternalKey {
-    fn new(u: Slice, /* seq: SequenceNumber, */ t: ValueType) -> ParsedInternalKey {
-        ParsedInternalKey {
+    fn new(u: Slice, seq: u64, t: ValueType) -> Self {
+        Self {
             user_key: u,
-            sequence: 0,
+            sequence: seq,
             value_type: t,
         }
     }
 
-    fn debug_string() -> Slice {
+    fn debug_string(&self) -> Slice {
         Slice::default()
     }
 
     /// Return the length of the encoding of "key".
-    fn internal_key_encoding_length(key: ParsedInternalKey) -> usize {
+    fn internal_key_encoding_length(&self, key: ParsedInternalKey) -> usize {
         key.user_key.size() + 8
     }
 
-    fn append_internal_key(key : ParsedInternalKey) -> Slice {
+    fn append_internal_key(&self, key : ParsedInternalKey) -> Slice {
         todo!()
     }
 
     /// Attempt to parse an internal key from "internal_key".  On success,
     /// stores the parsed data in "*result", and returns true.
     /// On error, returns false, leaves "*result" in an undefined state.
-    fn parse_internal_key(internal_key : Slice, target: ParsedInternalKey) -> bool {
+    fn parse_internal_key(&self, internal_key : Slice, target: ParsedInternalKey) -> bool {
         todo!()
     }
 
     /// Returns the user key portion of an internal key.
-    fn extract_user_key(internal_key : Slice) -> Slice {
+    fn extract_user_key(&self, internal_key : Slice) -> Slice {
         todo!()
     }
 }
diff --git a/src/db/log_writer.rs b/src/db/log_writer.rs
index 48e567cda808384f73fa3c57b73a2ebeb7eb0338..42406db3f609f86e330a8e039f8f53ee9541a3c3 100644
--- a/src/db/log_writer.rs
+++ b/src/db/log_writer.rs
@@ -79,7 +79,7 @@ impl LogWriter {
         header[6] = record_type;
         let mut crc = CRC::extend(self.type_crc[record_type as usize], data);
         crc = CRC::mask(crc);
-        Coding::encode_fixed32(&mut crc, header.as_mut(), 0);
+        Coding::encode_fixed32(crc, header.as_mut(), 0);
         self.file_writer.write(header.as_ref())?;
         self.block_offset += K_HEADER_SIZE;
         if !data.is_empty() {
diff --git a/src/db/mem_table.rs b/src/db/mem_table.rs
index 56566ce53a72225323ef3cf32f48773c25891143..b9720c2f7413f530415843a9ef2d283e3420a169 100644
--- a/src/db/mem_table.rs
+++ b/src/db/mem_table.rs
@@ -17,7 +17,7 @@ pub struct MemTable<Cmp: Comparator> {
 }
 
 /// 临时, 查找键
-struct LookupKey {}
+pub struct LookupKey {}
 
 impl <Cmp: Comparator> MemTable<Cmp> {
 
diff --git a/src/table/format.rs b/src/table/format.rs
index d956954d18cf4af447d688db36883eadf46400a4..01c9610c998bfc3f3532bf7df37e4868de6d1577 100644
--- a/src/table/format.rs
+++ b/src/table/format.rs
@@ -168,7 +168,7 @@ impl BlockTrait for BlockHandle {
         self.size_ = size;
     }
 
-    fn encode_to(&self) -> Slice {
+    fn encode_to(&self) -> Result<Slice> {
         todo!()
 
         // // Sanity check that all fields have been set
@@ -181,7 +181,7 @@ impl BlockTrait for BlockHandle {
         // Slice::default()
     }
 
-    fn decode_from(&self, input: Slice) -> Result<bool> {
+    fn decode_from(&mut self, input: Slice) -> Result<()> {
         todo!()
     }
 }
@@ -201,7 +201,7 @@ impl FootTrait for Footer {
         todo!()
     }
 
-    fn set_metaindex_handle(&self, h: BlockHandle) {
+    fn set_metaindex_handle(&mut self, h: BlockHandle) {
         todo!()
     }
 
@@ -209,15 +209,15 @@ impl FootTrait for Footer {
         todo!()
     }
 
-    fn set_index_handle(&self, h: BlockHandle) {
+    fn set_index_handle(&mut self, h: BlockHandle) {
         todo!()
     }
 
-    fn encode_to(&self) -> Slice {
+    fn encode_to(&self) -> Result<Slice> {
         todo!()
     }
 
-    fn decode_from(&self, input: Slice) -> Result<bool> {
+    fn decode_from(&mut self, input: Slice) -> Result<()> {
         todo!()
     }
 }
diff --git a/src/util/cache.rs b/src/util/cache.rs
index 274d715332aca3de2c61d51120c2fd53d2b1f492..8d69c2d2621a2775d5f270a6f922127093127ca1 100644
--- a/src/util/cache.rs
+++ b/src/util/cache.rs
@@ -4,7 +4,7 @@ use crate::util::slice::Slice;
 
 use crate::util::Result;
 
-struct Handle {}
+pub struct Handle {}
 
 pub struct LRUHandle<T> {
     key: Slice,