完成用户的角色分配，妥妥的。睡觉~

src/main/java/cn/iocoder/dashboard/modules/system/dal/mysql/dao/permission/SysRoleMapper.java

@@ -8,6 +8,10 @@ import com.baomidou.mybatisplus.core.mapper.BaseMapper;
 import com.baomidou.mybatisplus.core.metadata.IPage;
 import org.apache.ibatis.annotations.Mapper;
 
+import javax.annotation.Nullable;
+import java.util.Collection;
+import java.util.List;
+
 @Mapper
 public interface SysRoleMapper extends BaseMapper<SysRoleDO> {
 
@@ -27,5 +31,7 @@ public interface SysRoleMapper extends BaseMapper<SysRoleDO> {
         return selectOne(new QueryWrapperX<SysRoleDO>().eq("code", code));
     }
 
-
+    default List<SysRoleDO> selectListByStatus(@Nullable Collection<Integer> statuses) {
+        return selectList(new QueryWrapperX<SysRoleDO>().in("status", statuses));
+    }
 }

src/main/java/cn/iocoder/dashboard/modules/system/dal/mysql/dao/permission/SysUserRoleMapper.java

@@ -5,7 +5,9 @@ import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
 import com.baomidou.mybatisplus.core.mapper.BaseMapper;
 import org.apache.ibatis.annotations.Mapper;
 
+import java.util.Collection;
 import java.util.List;
+import java.util.stream.Collectors;
 
 @Mapper
 public interface SysUserRoleMapper extends BaseMapper<SysUserRoleDO> {
@@ -14,4 +16,20 @@ public interface SysUserRoleMapper extends BaseMapper<SysUserRoleDO> {
         return selectList(new QueryWrapper<SysUserRoleDO>().eq("user_id", userId));
     }
 
+    default void insertList(Long userId, Collection<Long> roleIds) {
+        List<SysUserRoleDO> list = roleIds.stream().map(roleId -> {
+            SysUserRoleDO entity = new SysUserRoleDO();
+            entity.setUserId(userId);
+            entity.setRoleId(roleId);
+            return entity;
+        }).collect(Collectors.toList());
+        // TODO 芋艿，mybatis plus 增加批量插入的功能
+        list.forEach(this::insert);
+    }
+
+    default void deleteListByUserIdAndRoleIdIds(Long userId, Collection<Long> roleIds) {
+        delete(new QueryWrapper<SysUserRoleDO>().eq("user_id", userId)
+                .in("role_id", roleIds));
+    }
+
 }