feat(db): 添加对达梦数据库的支持

- 在应用程序中新增对达梦数据库（DM）的配置和连接支持 - 实现 SetDmDB 函数以配置达梦数据库连接 - 更新数据库操作逻辑，支持达梦特有的 SQL 语法和功能 - 在相关文件中添加达梦数据库的处理逻辑，包括表创建、数据插入和查询 - 更新 go.mod 和 go.sum 文件以引入达梦数据库驱动 - 增强文档，详细说明达梦数据库的配置和使用方法
2026-03-20 10:46:51 +08:00
parent 7ab803c5cc
commit b43f968b6c
194 changed files with 211502 additions and 2328 deletions
@@ -0,0 +1,137 @@
+/*
+ * Copyright (c) 2000-2018, 达梦数据库有限公司.
+ * All rights reserved.
+ */
+package dm
+
+const (
+	LOB_FLAG_BYTE = 0
+	LOB_FLAG_CHAR = 1
+
+	LOB_IN_ROW  = 0x1
+	LOB_OFF_ROW = 0x2
+
+	NBLOB_HEAD_IN_ROW_FLAG = 0
+	NBLOB_HEAD_BLOBID      = NBLOB_HEAD_IN_ROW_FLAG + BYTE_SIZE
+	NBLOB_HEAD_BLOB_LEN    = NBLOB_HEAD_BLOBID + DDWORD_SIZE
+
+	NBLOB_HEAD_OUTROW_GROUPID = NBLOB_HEAD_BLOB_LEN + ULINT_SIZE
+	NBLOB_HEAD_OUTROW_FILEID  = NBLOB_HEAD_OUTROW_GROUPID + USINT_SIZE
+	NBLOB_HEAD_OUTROW_PAGENO  = NBLOB_HEAD_OUTROW_FILEID + USINT_SIZE
+
+	NBLOB_EX_HEAD_TABLE_ID   = NBLOB_HEAD_OUTROW_PAGENO + ULINT_SIZE
+	NBLOB_EX_HEAD_COL_ID     = NBLOB_EX_HEAD_TABLE_ID + ULINT_SIZE
+	NBLOB_EX_HEAD_ROW_ID     = NBLOB_EX_HEAD_COL_ID + USINT_SIZE
+	NBLOB_EX_HEAD_FPA_GRPID  = NBLOB_EX_HEAD_ROW_ID + LINT64_SIZE
+	NBLOB_EX_HEAD_FPA_FILEID = NBLOB_EX_HEAD_FPA_GRPID + USINT_SIZE
+	NBLOB_EX_HEAD_FPA_PAGENO = NBLOB_EX_HEAD_FPA_FILEID + USINT_SIZE
+	NBLOB_EX_HEAD_SIZE       = NBLOB_EX_HEAD_FPA_PAGENO + ULINT_SIZE
+
+	NBLOB_OUTROW_HEAD_SIZE = NBLOB_HEAD_OUTROW_PAGENO + ULINT_SIZE
+
+	NBLOB_INROW_HEAD_SIZE = NBLOB_HEAD_BLOB_LEN + ULINT_SIZE
+)
+
+type lob struct {
+	blobId int64
+	inRow  bool
+
+	groupId   int16
+	fileId    int16
+	pageNo    int32
+	tabId     int32
+	colId     int16
+	rowId     int64
+	exGroupId int16
+	exFileId  int16
+	exPageNo  int32
+
+	curFileId     int16
+	curPageNo     int32
+	curPageOffset int16
+	totalOffset   int32
+	readOver      bool
+
+	connection       *DmConnection
+	local            bool
+	updateable       bool
+	lobFlag          int8
+	length           int64
+	compatibleOracle bool
+	fetchAll         bool
+	freed            bool
+	modify           bool
+
+	Valid bool
+}
+
+func (lob *lob) GetLength() (int64, error) {
+	var err error
+	if err = lob.checkValid(); err != nil {
+		return -1, err
+	}
+	if err = lob.checkFreed(); err != nil {
+		return -1, err
+	}
+	if lob.length == -1 {
+
+		if lob.length, err = lob.connection.Access.dm_build_585(lob); err != nil {
+			return -1, err
+		}
+	}
+	return lob.length, nil
+}
+
+func (lob *lob) resetCurrentInfo() {
+	lob.curFileId = lob.fileId
+	lob.curPageNo = lob.pageNo
+	lob.totalOffset = 0
+	lob.curPageOffset = 0
+}
+
+func (lob *lob) getLengthFromHead(head []byte) int64 {
+	return int64(Dm_build_1346.Dm_build_1448(head, NBLOB_HEAD_BLOB_LEN))
+}
+
+func (lob *lob) canOptimized(connection *DmConnection) bool {
+	return !(lob.inRow || lob.fetchAll || lob.local || connection != lob.connection)
+}
+
+func (lob *lob) buildCtlData() (bytes []byte) {
+	if lob.connection.NewLobFlag {
+		bytes = make([]byte, NBLOB_EX_HEAD_SIZE, NBLOB_EX_HEAD_SIZE)
+	} else {
+		bytes = make([]byte, NBLOB_OUTROW_HEAD_SIZE, NBLOB_OUTROW_HEAD_SIZE)
+	}
+	Dm_build_1346.Dm_build_1347(bytes, NBLOB_HEAD_IN_ROW_FLAG, LOB_OFF_ROW)
+	Dm_build_1346.Dm_build_1367(bytes, NBLOB_HEAD_BLOBID, lob.blobId)
+	Dm_build_1346.Dm_build_1362(bytes, NBLOB_HEAD_BLOB_LEN, -1)
+
+	Dm_build_1346.Dm_build_1357(bytes, NBLOB_HEAD_OUTROW_GROUPID, lob.groupId)
+	Dm_build_1346.Dm_build_1357(bytes, NBLOB_HEAD_OUTROW_FILEID, lob.fileId)
+	Dm_build_1346.Dm_build_1362(bytes, NBLOB_HEAD_OUTROW_PAGENO, lob.pageNo)
+
+	if lob.connection.NewLobFlag {
+		Dm_build_1346.Dm_build_1362(bytes, NBLOB_EX_HEAD_TABLE_ID, lob.tabId)
+		Dm_build_1346.Dm_build_1357(bytes, NBLOB_EX_HEAD_COL_ID, lob.colId)
+		Dm_build_1346.Dm_build_1367(bytes, NBLOB_EX_HEAD_ROW_ID, lob.rowId)
+		Dm_build_1346.Dm_build_1357(bytes, NBLOB_EX_HEAD_FPA_GRPID, lob.exGroupId)
+		Dm_build_1346.Dm_build_1357(bytes, NBLOB_EX_HEAD_FPA_FILEID, lob.exFileId)
+		Dm_build_1346.Dm_build_1362(bytes, NBLOB_EX_HEAD_FPA_PAGENO, lob.exPageNo)
+	}
+	return
+}
+
+func (lob *lob) checkFreed() (err error) {
+	if lob.freed {
+		err = ECGO_LOB_FREED.throw()
+	}
+	return
+}
+
+func (lob *lob) checkValid() error {
+	if !lob.Valid {
+		return ECGO_IS_NULL.throw()
+	}
+	return nil
+}