diff --git a/buildDockerImage.ps1 b/buildDockerImage.ps1
index 1729867..acbeab1 100644
--- a/buildDockerImage.ps1
+++ b/buildDockerImage.ps1
@@ -5,6 +5,10 @@ java -Djarmode=layertools `
 extract --destination build/extracted
 
 docker build -f .\Dockerfile -t auto/aics_main:latest .
+
 echo 'saving...'
 docker save -o ..\docker\aics_main.tar auto/aics_main:latest
+
+echo 'compressing...'
+Compress-Archive -Path ..\docker\aics_main.tar -DestinationPath ..\docker\aics_main.zip
 pause
\ No newline at end of file
diff --git a/src/main/kotlin/cn/edu/hfut/auto/knowledge/controller/KnowledgeController.kt b/src/main/kotlin/cn/edu/hfut/auto/knowledge/controller/KnowledgeController.kt
index ddbac8b..c5cbb2d 100644
--- a/src/main/kotlin/cn/edu/hfut/auto/knowledge/controller/KnowledgeController.kt
+++ b/src/main/kotlin/cn/edu/hfut/auto/knowledge/controller/KnowledgeController.kt
@@ -110,6 +110,7 @@ class KnowledgeController(
                     id = it
                 }
             }
+            createTime = LocalDateTime.now()
         })
     }
 
@@ -150,4 +151,8 @@ class KnowledgeController(
             }
             ?: throw BusinessError(ErrorCode.RESOURCE_NOT_FOUND)
     }
+
+    @GetMapping
+    suspend fun findKnowledgeByType(type: KnowledgeFileAttribute.FileType): List<Knowledge> =
+        knowledgeRepository.findAllByKnowledgeFileAttributeSuffixIn(type.suffixes, Knowledge.BRIEF_FETCHER)
 }
\ No newline at end of file
diff --git a/src/main/kotlin/cn/edu/hfut/auto/knowledge/entity/KnowledgeFileAttribute.kt b/src/main/kotlin/cn/edu/hfut/auto/knowledge/entity/KnowledgeFileAttribute.kt
index 4d9073c..41c8c6a 100644
--- a/src/main/kotlin/cn/edu/hfut/auto/knowledge/entity/KnowledgeFileAttribute.kt
+++ b/src/main/kotlin/cn/edu/hfut/auto/knowledge/entity/KnowledgeFileAttribute.kt
@@ -39,6 +39,13 @@ interface KnowledgeFileAttribute {
             }
         }
     }
+
+    @Suppress("unused")
+    enum class FileType(val suffixes: List<String>) {
+        AUDIO(listOf("wav", "mp3")),
+        VIDEO(listOf("mp4", "avi", "flv", "mkv", "wmv")),
+        DOCUMENT(listOf("pdf", "doc", "docx", "xls", "xlsx", "ppt", "pptx", "txt", "md"))
+    }
 }
 
 inline val KnowledgeFileAttribute.externalPreviewable: Boolean
diff --git a/src/main/kotlin/cn/edu/hfut/auto/knowledge/repository/KnowledgeRepository.kt b/src/main/kotlin/cn/edu/hfut/auto/knowledge/repository/KnowledgeRepository.kt
index 8ffb7ac..6f3e73b 100644
--- a/src/main/kotlin/cn/edu/hfut/auto/knowledge/repository/KnowledgeRepository.kt
+++ b/src/main/kotlin/cn/edu/hfut/auto/knowledge/repository/KnowledgeRepository.kt
@@ -1,12 +1,28 @@
 package cn.edu.hfut.auto.knowledge.repository
 
 import cn.edu.hfut.auto.knowledge.entity.Knowledge
+import cn.edu.hfut.auto.knowledge.entity.id
+import cn.edu.hfut.auto.knowledge.entity.parent
+import cn.edu.hfut.auto.knowledge.entity.`parent?`
 import org.babyfish.jimmer.spring.repository.KRepository
 import org.babyfish.jimmer.sql.fetcher.Fetcher
+import org.babyfish.jimmer.sql.kt.ast.expression.eq
+import org.babyfish.jimmer.sql.kt.ast.table.isNull
 import java.util.*
 
 interface KnowledgeRepository : KRepository<Knowledge, UUID> {
     fun findByNameAndParentId(name: String, parentId: UUID?, fetcher: Fetcher<Knowledge>? = null): Knowledge?
 
-    fun findAllByParentId(parentId: UUID?, fetcher: Fetcher<Knowledge>? = null): List<Knowledge>
+    fun findAllByParentId(parentId: UUID?, fetcher: Fetcher<Knowledge>? = null): List<Knowledge> {
+        return sql.createQuery(Knowledge::class) {
+            if (parentId == null) {
+                where(table.`parent?`.isNull())
+            } else {
+                where(table.parent.id eq parentId)
+            }
+            select(table.fetch(fetcher))
+        }.execute()
+    }
+
+    fun findAllByKnowledgeFileAttributeSuffixIn(knowledgeFileAttributeSuffix: List<String>, fetcher: Fetcher<Knowledge>? = null): List<Knowledge>
 }
\ No newline at end of file