src/backend/build.gradle.kts

@@ -23,6 +23,7 @@ repositories {
 dependencies {
     implementation("com.auth0:java-jwt:4.4.0")
     implementation("com.baomidou:mybatis-plus-spring-boot4-starter:3.5.15")
+    implementation("com.baomidou:mybatis-plus-jsqlparser:3.5.15")
     implementation("org.springframework.boot:spring-boot-starter-amqp")
     implementation("org.springframework.boot:spring-boot-starter-data-redis-reactive")
     implementation("org.springframework.boot:spring-boot-starter-json")

src/backend/src/main/kotlin/club/itstudio/itmanager/config/MybatisConfig.kt

@@ -0,0 +1,18 @@
+package club.itstudio.itmanager.config
+
+import com.baomidou.mybatisplus.annotation.DbType
+import com.baomidou.mybatisplus.extension.plugins.MybatisPlusInterceptor
+import com.baomidou.mybatisplus.extension.plugins.inner.PaginationInnerInterceptor
+import org.springframework.context.annotation.Bean
+import org.springframework.context.annotation.Configuration
+
+@Configuration
+class MybatisConfig {
+
+    @Bean
+    fun mybatisPlusInterceptor(): MybatisPlusInterceptor {
+        val interceptor = MybatisPlusInterceptor()
+        interceptor.addInnerInterceptor(PaginationInnerInterceptor(DbType.MARIADB))
+        return interceptor
+    }
+}

src/backend/src/main/kotlin/club/itstudio/itmanager/service/FileStorageService.kt

@@ -0,0 +1,61 @@
+package club.itstudio.itmanager.service
+
+import club.itstudio.itmanager.utils.Const
+import org.slf4j.LoggerFactory
+import org.springframework.beans.factory.annotation.Value
+import org.springframework.http.codec.multipart.FilePart
+import org.springframework.stereotype.Service
+import reactor.core.publisher.Mono
+import reactor.core.scheduler.Schedulers
+import java.io.IOException
+import java.nio.file.Files
+import java.nio.file.Path
+import java.nio.file.Paths
+import java.util.*
+
+@Service
+class FileStorageService(
+    @Value($$"${app.file.data-path}")
+    private val dataPath: String
+) {
+    data class StoredFile(
+        val path: Path,
+        val size: Long
+    )
+
+    private val logger = LoggerFactory.getLogger(this::class.java)
+
+    fun saveImage(file: FilePart, subDir: String, entityId: Long): Mono<StoredFile> {
+        val directory = Paths.get(dataPath, Const.FILE_DIR_IMAGE, subDir, entityId.toString())
+        val savedName = generateSafeFileName(file.filename())
+        val target = directory.resolve(savedName)
+        return Mono.fromCallable<Void> { Files.createDirectories(directory); null }
+            .then(file.transferTo(target))
+            .then(Mono.fromCallable { StoredFile(target, Files.size(target)) })
+            .subscribeOn(Schedulers.boundedElastic())
+    }
+
+    fun deleteFile(path: String?): Mono<Void> {
+        if (path.isNullOrBlank()) return Mono.empty()
+        return Mono.fromRunnable<Void> {
+            try {
+                Files.deleteIfExists(Paths.get(path))
+            } catch (e: IOException) {
+                logger.warn("Failed to delete file: {}", path, e)
+            }
+        }.subscribeOn(Schedulers.boundedElastic())
+    }
+
+    fun generateSafeFileName(original: String?): String {
+        val extension = original
+            ?.substringAfterLast('.')
+            ?.lowercase()
+            ?.takeIf {
+                it.isNotBlank() &&
+                        it.length <= 10 &&
+                        it.all { ch -> ch.isLetterOrDigit() }
+            }
+        return if (extension != null) "${UUID.randomUUID()}.$extension" else UUID.randomUUID().toString()
+    }
+}
+

src/backend/src/main/kotlin/club/itstudio/itmanager/service/impl/BorrowRecordServiceImpl.kt

@@ -3,6 +3,7 @@ package club.itstudio.itmanager.service.impl
 import club.itstudio.itmanager.entity.dto.BorrowRecord
 import club.itstudio.itmanager.mapper.BorrowRecordMapper
 import club.itstudio.itmanager.service.BorrowRecordService
+import com.baomidou.mybatisplus.extension.kotlin.KtQueryWrapper
 import com.baomidou.mybatisplus.extension.plugins.pagination.Page
 import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl
 import org.slf4j.LoggerFactory
@@ -32,7 +33,7 @@ class BorrowRecordServiceImpl : ServiceImpl<BorrowRecordMapper, BorrowRecord>(),
     ): Mono<Page<BorrowRecord>> =
         blockingCall {
             logger.info("Paging borrow records")
-            val wrapper = ktQuery()
+            val wrapper = KtQueryWrapper(BorrowRecord())
             if (!keyword.isNullOrBlank()) {
                 wrapper.like(BorrowRecord::borrower, keyword)
             }

src/backend/src/main/kotlin/club/itstudio/itmanager/service/v1/FinanceApiService.kt

@@ -9,22 +9,18 @@ import club.itstudio.itmanager.service.AccountService
 import club.itstudio.itmanager.service.AttachmentService
 import club.itstudio.itmanager.service.CategoryService
 import club.itstudio.itmanager.service.FinanceRecordService
+import club.itstudio.itmanager.service.FileStorageService
 import club.itstudio.itmanager.utils.Const
 import club.itstudio.itmanager.utils.DateUtils.getCurrentDateTime
 import com.baomidou.mybatisplus.extension.plugins.pagination.Page
 import org.slf4j.LoggerFactory
 import org.springframework.amqp.core.AmqpTemplate
-import org.springframework.beans.factory.annotation.Value
 import org.springframework.http.codec.multipart.FilePart
 import org.springframework.stereotype.Service
 import reactor.core.publisher.Flux
 import reactor.core.publisher.Mono
 import reactor.core.scheduler.Schedulers
-import java.io.IOException
-import java.nio.file.Files
-import java.nio.file.Paths
 import java.util.NoSuchElementException
-import java.util.UUID
 
 @Service
 class FinanceApiService(
@@ -33,9 +29,7 @@ class FinanceApiService(
     private val attachmentService: AttachmentService,
     private val accountService: AccountService,
     private val amqpTemplate: AmqpTemplate,
-
+    private val fileStorageService: FileStorageService
-    @Value($$"${app.file.data-path}")
-    private val dataPath: String
 ) {
     private val logger = LoggerFactory.getLogger(this::class.java)
 
@@ -171,41 +165,25 @@ class FinanceApiService(
     }
 
     private fun saveFinanceImage(financeRecordId: Long, file: FilePart): Mono<Attachment> {
-        val directory = Paths.get(dataPath, Const.FILE_DIR_IMAGE, "finance", financeRecordId.toString())
+        return fileStorageService.saveImage(file, "finance", financeRecordId)
-        val savedName = generateSafeFileName(file.filename())
+            .map { stored ->
-        val target = directory.resolve(savedName)
+                Attachment(
-        return Mono.fromCallable {
+                    relatedTable = "finance_records",
-            Files.createDirectories(directory)
+                    relatedId = financeRecordId,
-            file.transferTo(target)
+                    fileName = stored.path.fileName.toString(),
-            Attachment(
+                    filePath = stored.path.toString(),
-                relatedTable = "finance_records",
+                    fileSize = stored.size,
-                relatedId = financeRecordId,
+                    contentType = file.headers().contentType?.toString(),
-                fileName = savedName,
+                    uploadedAt = getCurrentDateTime()
-                filePath = target.toString(),
+                )
-                fileSize = Files.size(target),
-                contentType = file.headers().contentType?.toString(),
-                uploadedAt = getCurrentDateTime()
-            )
-        }.subscribeOn(Schedulers.boundedElastic())
-    }
-
-    private fun generateSafeFileName(original: String?): String {
-        val extension = original
-            ?.substringAfterLast('.')
-            ?.lowercase()
-            ?.takeIf {
-                it.isNotBlank() &&
-                    it.length <= 10 &&
-                    it.all { ch -> ch.isLetterOrDigit() }
             }
-        return if (extension != null) "${UUID.randomUUID()}.$extension" else UUID.randomUUID().toString()
     }
 
     private fun cleanupFinanceAttachments(financeRecordId: Long): Mono<Boolean> {
         return attachmentService.listByRelated("finance_records", financeRecordId)
             .flatMap { attachments ->
                 Flux.fromIterable(attachments)
-                    .flatMap { deletePhysicalFile(it.filePath) }
+                    .flatMap { fileStorageService.deleteFile(it.filePath) }
                     .then(attachmentService.deleteByRelated("finance_records", financeRecordId))
             }
             .onErrorResume { error ->
@@ -236,15 +214,4 @@ class FinanceApiService(
                 }
             }
     }
-
-    private fun deletePhysicalFile(path: String?): Mono<Void> {
-        if (path.isNullOrBlank()) return Mono.empty()
-        return Mono.fromRunnable<Void> {
-            try {
-                Files.deleteIfExists(Paths.get(path))
-            } catch (e: IOException) {
-                logger.warn("Failed to delete file: {}", path, e)
-            }
-        }.subscribeOn(Schedulers.boundedElastic())
-    }
 }

src/backend/src/main/kotlin/club/itstudio/itmanager/service/v1/ItemsApiService.kt

@@ -7,23 +7,18 @@ import club.itstudio.itmanager.entity.dto.ItemTransaction
 import club.itstudio.itmanager.entity.enums.TransactionType
 import club.itstudio.itmanager.service.AttachmentService
 import club.itstudio.itmanager.service.CategoryService
+import club.itstudio.itmanager.service.FileStorageService
 import club.itstudio.itmanager.service.ItemService
 import club.itstudio.itmanager.service.ItemTransactionService
 import club.itstudio.itmanager.utils.Const
 import club.itstudio.itmanager.utils.DateUtils.getCurrentDateTime
 import com.baomidou.mybatisplus.extension.plugins.pagination.Page
 import org.slf4j.LoggerFactory
-import org.springframework.beans.factory.annotation.Value
 import org.springframework.http.codec.multipart.FilePart
 import org.springframework.stereotype.Service
 import reactor.core.publisher.Flux
 import reactor.core.publisher.Mono
-import reactor.core.scheduler.Schedulers
-import java.io.IOException
-import java.nio.file.Files
-import java.nio.file.Paths
 import java.util.NoSuchElementException
-import java.util.UUID
 
 @Service
 class ItemsApiService(
@@ -31,9 +26,7 @@ class ItemsApiService(
     private val categoryService: CategoryService,
     private val attachmentService: AttachmentService,
     private val transactionService: ItemTransactionService,
-    
+    private val fileStorageService: FileStorageService
-    @Value($$"${app.file.data-path}")
-    private val dataPath: String
 ) {
     private val logger = LoggerFactory.getLogger(this::class.java)
     
@@ -276,7 +269,7 @@ class ItemsApiService(
             .flatMap { attachment ->
                 attachmentService.deleteAttachment(id).flatMap { success ->
                     if (success) {
-                        deletePhysicalFile(attachment.filePath).thenReturn("")
+                        fileStorageService.deleteFile(attachment.filePath).thenReturn("")
                     } else {
                         Mono.just("item image delete failed.")
                     }
@@ -296,41 +289,25 @@ class ItemsApiService(
     }
 
     private fun saveItemImage(itemId: Long, file: FilePart): Mono<Attachment> {
-        val directory = Paths.get(dataPath, Const.FILE_DIR_IMAGE, "items", itemId.toString())
+        return fileStorageService.saveImage(file, "items", itemId)
-        val savedName = generateSafeFileName(file.filename())
+            .map { stored ->
-        val target = directory.resolve(savedName)
+                Attachment(
-        return Mono.fromCallable {
+                    relatedTable = "items",
-            Files.createDirectories(directory)
+                    relatedId = itemId,
-            file.transferTo(target)
+                    fileName = stored.path.fileName.toString(),
-            Attachment(
+                    filePath = stored.path.toString(),
-                relatedTable = "items",
+                    fileSize = stored.size,
-                relatedId = itemId,
+                    contentType = file.headers().contentType?.toString(),
-                fileName = savedName,
+                    uploadedAt = getCurrentDateTime()
-                filePath = target.toString(),
+                )
-                fileSize = Files.size(target),
-                contentType = file.headers().contentType?.toString(),
-                uploadedAt = getCurrentDateTime()
-            )
-        }.subscribeOn(Schedulers.boundedElastic())
-    }
-
-    private fun generateSafeFileName(original: String?): String {
-        val extension = original
-            ?.substringAfterLast('.')
-            ?.lowercase()
-            ?.takeIf {
-                it.isNotBlank() &&
-                    it.length <= 10 &&
-                    it.all { ch -> ch.isLetterOrDigit() }
             }
-        return if (extension != null) "${UUID.randomUUID()}.$extension" else UUID.randomUUID().toString()
     }
 
     private fun cleanupItemAttachments(itemId: Long): Mono<String> {
         return attachmentService.listByRelated("items", itemId)
             .flatMap { attachments ->
                 Flux.fromIterable(attachments)
-                    .flatMap { deletePhysicalFile(it.filePath) }
+                    .flatMap { fileStorageService.deleteFile(it.filePath) }
                     .then(attachmentService.deleteByRelated("items", itemId))
                     .thenReturn("")
             }
@@ -339,15 +316,4 @@ class ItemsApiService(
                 Mono.just("")
             }
     }
-
-    private fun deletePhysicalFile(path: String?): Mono<Void> {
-        if (path.isNullOrBlank()) return Mono.empty()
-        return Mono.fromRunnable<Void> {
-            try {
-                Files.deleteIfExists(Paths.get(path))
-            } catch (e: IOException) {
-                logger.warn("Failed to delete file: {}", path, e)
-            }
-        }.subscribeOn(Schedulers.boundedElastic())
-    }
 }

src/backend/src/main/kotlin/club/itstudio/itmanager/service/v1/UsagesApiService.kt

@@ -4,29 +4,22 @@ import club.itstudio.itmanager.entity.dto.Attachment
 import club.itstudio.itmanager.entity.dto.BorrowRecord
 import club.itstudio.itmanager.service.AttachmentService
 import club.itstudio.itmanager.service.BorrowRecordService
+import club.itstudio.itmanager.service.FileStorageService
 import club.itstudio.itmanager.utils.Const
 import club.itstudio.itmanager.utils.DateUtils.getCurrentDateTime
 import com.baomidou.mybatisplus.extension.plugins.pagination.Page
 import org.slf4j.LoggerFactory
-import org.springframework.beans.factory.annotation.Value
 import org.springframework.http.codec.multipart.FilePart
 import org.springframework.stereotype.Service
 import reactor.core.publisher.Flux
 import reactor.core.publisher.Mono
-import reactor.core.scheduler.Schedulers
-import java.io.IOException
-import java.nio.file.Files
-import java.nio.file.Paths
 import java.util.NoSuchElementException
-import java.util.UUID
 
 @Service
 class UsagesApiService(
     private val borrowRecordService: BorrowRecordService,
     private val attachmentService: AttachmentService,
-
+    private val fileStorageService: FileStorageService
-    @Value($$"${app.file.data-path}")
-    private val dataPath: String
 ) {
     private val logger = LoggerFactory.getLogger(this::class.java)
 
@@ -149,7 +142,7 @@ class UsagesApiService(
             .flatMap { attachment ->
                 attachmentService.deleteAttachment(id).flatMap { success ->
                     if (success) {
-                        deletePhysicalFile(attachment.filePath).thenReturn("")
+                        fileStorageService.deleteFile(attachment.filePath).thenReturn("")
                     } else {
                         Mono.just("usage image delete failed.")
                     }
@@ -160,41 +153,25 @@ class UsagesApiService(
     }
 
     private fun saveUsageImage(usageId: Long, file: FilePart): Mono<Attachment> {
-        val directory = Paths.get(dataPath, Const.FILE_DIR_IMAGE, "borrow_records", usageId.toString())
+        return fileStorageService.saveImage(file, "borrow_records", usageId)
-        val savedName = generateSafeFileName(file.filename())
+            .map { stored ->
-        val target = directory.resolve(savedName)
+                Attachment(
-        return Mono.fromCallable {
+                    relatedTable = RELATED_TABLE,
-            Files.createDirectories(directory)
+                    relatedId = usageId,
-            file.transferTo(target)
+                    fileName = stored.path.fileName.toString(),
-            Attachment(
+                    filePath = stored.path.toString(),
-                relatedTable = RELATED_TABLE,
+                    fileSize = stored.size,
-                relatedId = usageId,
+                    contentType = file.headers().contentType?.toString(),
-                fileName = savedName,
+                    uploadedAt = getCurrentDateTime()
-                filePath = target.toString(),
+                )
-                fileSize = Files.size(target),
-                contentType = file.headers().contentType?.toString(),
-                uploadedAt = getCurrentDateTime()
-            )
-        }.subscribeOn(Schedulers.boundedElastic())
-    }
-
-    private fun generateSafeFileName(original: String?): String {
-        val extension = original
-            ?.substringAfterLast('.')
-            ?.lowercase()
-            ?.takeIf {
-                it.isNotBlank() &&
-                    it.length <= 10 &&
-                    it.all { ch -> ch.isLetterOrDigit() }
             }
-        return if (extension != null) "${UUID.randomUUID()}.$extension" else UUID.randomUUID().toString()
     }
 
     private fun cleanupUsageAttachments(usageId: Long): Mono<String> {
         return attachmentService.listByRelated(RELATED_TABLE, usageId)
             .flatMap { attachments ->
                 Flux.fromIterable(attachments)
-                    .flatMap { deletePhysicalFile(it.filePath) }
+                    .flatMap { fileStorageService.deleteFile(it.filePath) }
                     .then(attachmentService.deleteByRelated(RELATED_TABLE, usageId))
                     .thenReturn("")
             }
@@ -204,17 +181,6 @@ class UsagesApiService(
             }
     }
 
-    private fun deletePhysicalFile(path: String?): Mono<Void> {
-        if (path.isNullOrBlank()) return Mono.empty()
-        return Mono.fromRunnable<Void> {
-            try {
-                Files.deleteIfExists(Paths.get(path))
-            } catch (e: IOException) {
-                logger.warn("Failed to delete file: {}", path, e)
-            }
-        }.subscribeOn(Schedulers.boundedElastic())
-    }
-
     companion object {
         private const val RELATED_TABLE = "borrow_records"
         private const val STATUS_BORROWED = "BORROWED"