feat(admin): add MetaObjectHandler and explicit UserRole PK/auto-fill

backend/mci-server/src/main/java/com/sino/mci/admin/entity/UserRole.java

@@ -1,5 +1,9 @@
 package com.sino.mci.admin.entity;
 
+import com.baomidou.mybatisplus.annotation.FieldFill;
+import com.baomidou.mybatisplus.annotation.IdType;
+import com.baomidou.mybatisplus.annotation.TableField;
+import com.baomidou.mybatisplus.annotation.TableId;
 import com.baomidou.mybatisplus.annotation.TableName;
 import lombok.Data;
 
@@ -9,8 +13,12 @@ import java.time.LocalDateTime;
 @TableName("mci_user_role")
 public class UserRole {
 
+    @TableId(type = IdType.AUTO)
     private Long id;
+
     private Long userId;
     private Long roleId;
+
+    @TableField(fill = FieldFill.INSERT)
     private LocalDateTime createTime;
 }

backend/mci-server/src/main/java/com/sino/mci/config/MybatisPlusMetaObjectHandler.java

@@ -0,0 +1,23 @@
+package com.sino.mci.config;
+
+import com.baomidou.mybatisplus.core.handlers.MetaObjectHandler;
+import org.apache.ibatis.reflection.MetaObject;
+import org.springframework.stereotype.Component;
+
+import java.time.LocalDateTime;
+
+@Component
+public class MybatisPlusMetaObjectHandler implements MetaObjectHandler {
+
+    @Override
+    public void insertFill(MetaObject metaObject) {
+        LocalDateTime now = LocalDateTime.now();
+        this.strictInsertFill(metaObject, "createTime", LocalDateTime.class, now);
+        this.strictInsertFill(metaObject, "updateTime", LocalDateTime.class, now);
+    }
+
+    @Override
+    public void updateFill(MetaObject metaObject) {
+        this.strictUpdateFill(metaObject, "updateTime", LocalDateTime.class, LocalDateTime.now());
+    }
+}