diff --git a/ruoyi-ccdi/src/main/java/com/ruoyi/ccdi/mapper/CcdiPurchaseTransactionMapper.java b/ruoyi-ccdi/src/main/java/com/ruoyi/ccdi/mapper/CcdiPurchaseTransactionMapper.java
new file mode 100644
index 0000000..deb2b48
--- /dev/null
+++ b/ruoyi-ccdi/src/main/java/com/ruoyi/ccdi/mapper/CcdiPurchaseTransactionMapper.java
@@ -0,0 +1,53 @@
+package com.ruoyi.ccdi.mapper;
+
+import com.baomidou.mybatisplus.core.mapper.BaseMapper;
+import com.baomidou.mybatisplus.extension.plugins.pagination.Page;
+import com.ruoyi.ccdi.domain.CcdiPurchaseTransaction;
+import com.ruoyi.ccdi.domain.dto.CcdiPurchaseTransactionQueryDTO;
+import com.ruoyi.ccdi.domain.vo.CcdiPurchaseTransactionVO;
+import org.apache.ibatis.annotations.Param;
+
+import java.util.List;
+
+/**
+ * 采购交易信息 数据层
+ *
+ * @author ruoyi
+ * @date 2026-02-06
+ */
+public interface CcdiPurchaseTransactionMapper extends BaseMapper<CcdiPurchaseTransaction> {
+
+    /**
+     * 分页查询采购交易列表
+     *
+     * @param page     分页对象
+     * @param queryDTO 查询条件
+     * @return 采购交易VO分页结果
+     */
+    Page<CcdiPurchaseTransactionVO> selectTransactionPage(@Param("page") Page<CcdiPurchaseTransactionVO> page,
+                                                          @Param("query") CcdiPurchaseTransactionQueryDTO queryDTO);
+
+    /**
+     * 查询采购交易详情
+     *
+     * @param purchaseId 采购事项ID
+     * @return 采购交易VO
+     */
+    CcdiPurchaseTransactionVO selectTransactionById(@Param("purchaseId") String purchaseId);
+
+    /**
+     * 批量插入采购交易数据
+     *
+     * @param list 采购交易列表
+     * @return 插入行数
+     */
+    int insertBatch(@Param("list") List<CcdiPurchaseTransaction> list);
+
+    /**
+     * 批量更新采购交易数据（先删除再插入）
+     *
+     * @param list 采购交易列表
+     * @return 更新行数
+     */
+    int insertOrUpdateBatch(@Param("list") List<CcdiPurchaseTransaction> list);
+}