support both mysql and postgres

weed/filer2/abstract_sql/abstract_sql_store.go

@@ -9,7 +9,13 @@ import (
 )
 
 type AbstractSqlStore struct {
-	DB *sql.DB
+	DB               *sql.DB
+	SqlInsert        string
+	SqlUpdate        string
+	SqlFind          string
+	SqlDelete        string
+	SqlListExclusive string
+	SqlListInclusive string
 }
 
 func (store *AbstractSqlStore) InsertEntry(entry *filer2.Entry) (err error) {
@@ -17,18 +23,17 @@ func (store *AbstractSqlStore) InsertEntry(entry *filer2.Entry) (err error) {
 	dir, name := entry.FullPath.DirAndName()
 	meta, err := entry.EncodeAttributesAndChunks()
 	if err != nil {
-		return fmt.Errorf("mysql encode %s: %s", entry.FullPath, err)
+		return fmt.Errorf("encode %s: %s", entry.FullPath, err)
 	}
 
-	res, err := store.DB.Exec("INSERT INTO filemeta (dirhash,name,directory,meta) VALUES(?,?,?,?)",
-		hashToLong(dir), name, dir, meta)
+	res, err := store.DB.Exec(store.SqlInsert, hashToLong(dir), name, dir, meta)
 	if err != nil {
-		return fmt.Errorf("mysql insert %s: %s", entry.FullPath, err)
+		return fmt.Errorf("insert %s: %s", entry.FullPath, err)
 	}
 
 	_, err = res.RowsAffected()
 	if err != nil {
-		return fmt.Errorf("mysql insert %s but no rows affected: %s", entry.FullPath, err)
+		return fmt.Errorf("insert %s but no rows affected: %s", entry.FullPath, err)
 	}
 	return nil
 }
@@ -38,18 +43,17 @@ func (store *AbstractSqlStore) UpdateEntry(entry *filer2.Entry) (err error) {
 	dir, name := entry.FullPath.DirAndName()
 	meta, err := entry.EncodeAttributesAndChunks()
 	if err != nil {
-		return fmt.Errorf("mysql encode %s: %s", entry.FullPath, err)
+		return fmt.Errorf("encode %s: %s", entry.FullPath, err)
 	}
 
-	res, err := store.DB.Exec("UPDATE filemeta SET meta=? WHERE dirhash=? AND name=? AND directory=?",
-		meta, hashToLong(dir), name, dir)
+	res, err := store.DB.Exec(store.SqlUpdate, meta, hashToLong(dir), name, dir)
 	if err != nil {
-		return fmt.Errorf("mysql update %s: %s", entry.FullPath, err)
+		return fmt.Errorf("update %s: %s", entry.FullPath, err)
 	}
 
 	_, err = res.RowsAffected()
 	if err != nil {
-		return fmt.Errorf("mysql update %s but no rows affected: %s", entry.FullPath, err)
+		return fmt.Errorf("update %s but no rows affected: %s", entry.FullPath, err)
 	}
 	return nil
 }
@@ -57,18 +61,17 @@ func (store *AbstractSqlStore) UpdateEntry(entry *filer2.Entry) (err error) {
 func (store *AbstractSqlStore) FindEntry(fullpath filer2.FullPath) (*filer2.Entry, error) {
 
 	dir, name := fullpath.DirAndName()
-	row := store.DB.QueryRow("SELECT meta FROM filemeta WHERE dirhash=? AND name=? AND directory=?",
-		hashToLong(dir), name, dir)
+	row := store.DB.QueryRow(store.SqlFind, hashToLong(dir), name, dir)
 	var data []byte
 	if err := row.Scan(&data); err != nil {
-		return nil, fmt.Errorf("mysql read entry %s: %v", fullpath, err)
+		return nil, fmt.Errorf("read entry %s: %v", fullpath, err)
 	}
 
 	entry := &filer2.Entry{
 		FullPath: fullpath,
 	}
 	if err := entry.DecodeAttributesAndChunks(data); err != nil {
-		return entry, fmt.Errorf("mysql decode %s : %v", entry.FullPath, err)
+		return entry, fmt.Errorf("decode %s : %v", entry.FullPath, err)
 	}
 
 	return entry, nil
@@ -80,15 +83,14 @@ func (store *AbstractSqlStore) DeleteEntry(fullpath filer2.FullPath) (*filer2.En
 
 	dir, name := fullpath.DirAndName()
 
-	res, err := store.DB.Exec("DELETE FROM filemeta WHERE dirhash=? AND name=? AND directory=?",
-		hashToLong(dir), name, dir)
+	res, err := store.DB.Exec(store.SqlDelete, hashToLong(dir), name, dir)
 	if err != nil {
-		return nil, fmt.Errorf("mysql delete %s: %s", fullpath, err)
+		return nil, fmt.Errorf("delete %s: %s", fullpath, err)
 	}
 
 	_, err = res.RowsAffected()
 	if err != nil {
-		return nil, fmt.Errorf("mysql delete %s but no rows affected: %s", fullpath, err)
+		return nil, fmt.Errorf("delete %s but no rows affected: %s", fullpath, err)
 	}
 
 	return entry, nil
@@ -96,14 +98,14 @@ func (store *AbstractSqlStore) DeleteEntry(fullpath filer2.FullPath) (*filer2.En
 
 func (store *AbstractSqlStore) ListDirectoryEntries(fullpath filer2.FullPath, startFileName string, inclusive bool, limit int) (entries []*filer2.Entry, err error) {
 
-	sqlText := "SELECT NAME, meta FROM filemeta WHERE dirhash=? AND name>? AND directory=? LIMIT ?"
+	sqlText := store.SqlListExclusive
 	if inclusive {
-		sqlText = "SELECT NAME, meta FROM filemeta WHERE dirhash=? AND name>=? AND directory=? LIMIT ?"
+		sqlText = store.SqlListInclusive
 	}
 
 	rows, err := store.DB.Query(sqlText, hashToLong(string(fullpath)), startFileName, string(fullpath), limit)
 	if err != nil {
-		return nil, fmt.Errorf("mysql list %s : %v", fullpath, err)
+		return nil, fmt.Errorf("list %s : %v", fullpath, err)
 	}
 	defer rows.Close()
 
@@ -111,16 +113,16 @@ func (store *AbstractSqlStore) ListDirectoryEntries(fullpath filer2.FullPath, st
 		var name string
 		var data []byte
 		if err = rows.Scan(&name, &data); err != nil {
-			glog.V(0).Infof("mysql scan %s : %v", fullpath, err)
-			return nil, fmt.Errorf("mysql scan %s: %v", fullpath, err)
+			glog.V(0).Infof("scan %s : %v", fullpath, err)
+			return nil, fmt.Errorf("scan %s: %v", fullpath, err)
 		}
 
 		entry := &filer2.Entry{
 			FullPath: filer2.NewFullPath(string(fullpath), name),
 		}
 		if err = entry.DecodeAttributesAndChunks(data); err != nil {
-			glog.V(0).Infof("mysql scan decode %s : %v", entry.FullPath, err)
-			return nil, fmt.Errorf("mysql scan decode %s : %v", entry.FullPath, err)
+			glog.V(0).Infof("scan decode %s : %v", entry.FullPath, err)
+			return nil, fmt.Errorf("scan decode %s : %v", entry.FullPath, err)
 		}
 
 		entries = append(entries, entry)