DBVersion的读写修改

backend/roomroot-jwgl/src/main/java/com/roomroot/jwgl/service/impl/SystemSettingsServiceImpl.java

@@ -1,60 +1,41 @@
 package com.roomroot.jwgl.service.impl;
 
-import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
 import com.roomroot.jwgl.entity.DBVersion;
 import com.roomroot.jwgl.mapper.DBVersionMapper;
 import com.roomroot.jwgl.service.SystemSettingsService;
-import com.roomroot.jwgl.utils.UuidUtil;
 import jakarta.annotation.Resource;
 import org.springframework.stereotype.Service;
 import org.springframework.transaction.annotation.Transactional;
 
+import java.time.LocalDateTime;
+
 /**
- * 教务系统参数实现：DBVersion 单行 get-or-create，更新仅写非空字段。
+ * 教务系统参数实现：DBVersion 按"最大 ID=当前版本"读取，
+ * 更新复制当前行生成新版本（保留历史），仅覆盖非空字段。
  */
 @Service
 public class SystemSettingsServiceImpl implements SystemSettingsService {
 
+    private static final String INITIAL_VERSION_VALUE = "1";
+
     @Resource
     private DBVersionMapper dbVersionMapper;
 
     @Override
     public DBVersion get() {
-        DBVersion row = dbVersionMapper.selectOne(
-                new LambdaQueryWrapper<DBVersion>().last("LIMIT 1"));
+        DBVersion row = dbVersionMapper.selectCurrent();
         return row == null ? new DBVersion() : row;
     }
 
     @Transactional(rollbackFor = Exception.class)
     @Override
     public DBVersion update(DBVersion settings) {
-        DBVersion row = dbVersionMapper.selectOne(
-                new LambdaQueryWrapper<DBVersion>().last("LIMIT 1"));
-        if (row == null) {
-            row = new DBVersion();
-            row.setXYZKQJMBWJBH(UuidUtil.getUUID());
-            apply(row, settings);
-            dbVersionMapper.insert(row);
-            return row;
-        }
-        apply(row, settings);
-        dbVersionMapper.updateById(row);
-        return row;
-    }
-
-    /** 只写非空字段，避免前端局部提交清空其它参数 */
-    private void apply(DBVersion row, DBVersion src) {
-        if (src.getXS78J() != null) {
-            row.setXS78J(src.getXS78J());
-        }
-        if (src.getXSWS() != null) {
-            row.setXSWS(src.getXSWS());
-        }
-        if (src.getXSYJ() != null) {
-            row.setXSYJ(src.getXSYJ());
-        }
-        if (src.getJXYDMC() != null) {
-            row.setJXYDMC(src.getJXYDMC());
+        LocalDateTime now = LocalDateTime.now();
+        if (dbVersionMapper.selectCurrent() == null) {
+            dbVersionMapper.insertInitialSettings(settings, now, INITIAL_VERSION_VALUE);
+        } else {
+            dbVersionMapper.insertNextSettingsVersion(settings, now);
         }
+        return get();
     }
 }