首次创建结构

src/com/chinasofti/dao/BookCopyDAO.java

@@ -0,0 +1,12 @@
+package com.chinasofti.dao;
+
+import com.chinasofti.model.BookCopy;
+import java.util.List;
+
+public interface BookCopyDAO {
+    List<BookCopy> selectByBookId(Long bookId);
+    BookCopy selectAvailableByBookId(Long bookId); // 获取一个可借副本
+    int updateStatus(Long copyId, String status);
+    int insert(BookCopy copy);
+    int countAvailableByBookId(Long bookId);
+}