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

db/crud.go

@@ -285,13 +285,21 @@ func (that *HoTimeDB) Insert(table string, data map[string]interface{}) int64 {
 
 	query := "INSERT INTO " + processor.ProcessTableName(table) + " " + queryString + "VALUES" + valueString
 
-	res, err := that.Exec(query, values...)
-
 	id := int64(0)
-	if err.GetError() == nil && res != nil {
-		id1, err := res.LastInsertId()
-		that.LastErr.SetError(err)
-		id = id1
+	if that.Dialect != nil && !that.Dialect.SupportsLastInsertId() {
+		returningClause := that.Dialect.ReturningClause("id")
+		query = strings.TrimSuffix(query, ";") + returningClause
+		rows := that.Query(query, values...)
+		if len(rows) > 0 {
+			id = rows[0].GetInt64("id")
+		}
+	} else {
+		res, err := that.Exec(query, values...)
+		if err.GetError() == nil && res != nil {
+			id1, e := res.LastInsertId()
+			that.LastErr.SetError(e)
+			id = id1
+		}
 	}
 
 	// 如果插入成功，删除缓存
@@ -475,6 +483,8 @@ func (that *HoTimeDB) Upsert(table string, data Map, uniqueKeys Slice, updateCol
 		query = that.buildPostgresUpsert(table, columns, uniqueKeyStrs, updateColumnStrs, rawValues)
 	case "sqlite3", "sqlite":
 		query = that.buildSQLiteUpsert(table, columns, uniqueKeyStrs, updateColumnStrs, rawValues)
+	case "dm", "dameng":
+		query = that.buildDMUpsert(table, columns, uniqueKeyStrs, updateColumnStrs, rawValues)
 	default: // mysql
 		query = that.buildMySQLUpsert(table, columns, uniqueKeyStrs, updateColumnStrs, rawValues)
 	}
@@ -608,6 +618,52 @@ func (that *HoTimeDB) buildSQLiteUpsert(table string, columns []string, uniqueKe
 		") DO UPDATE SET " + strings.Join(updateParts, ", ")
 }
 
+// buildDMUpsert 构建达梦的 Upsert 语句（MERGE INTO）
+func (that *HoTimeDB) buildDMUpsert(table string, columns []string, uniqueKeys []string, updateColumns []string, rawValues map[string]string) string {
+	processor := that.GetProcessor()
+	dialect := that.GetDialect()
+	quotedTable := processor.ProcessTableName(table)
+
+	srcParts := make([]string, len(columns))
+	for i, col := range columns {
+		if raw, ok := rawValues[col]; ok {
+			srcParts[i] = raw + " AS " + dialect.QuoteIdentifier(col)
+		} else {
+			srcParts[i] = "? AS " + dialect.QuoteIdentifier(col)
+		}
+	}
+
+	onParts := make([]string, len(uniqueKeys))
+	for i, key := range uniqueKeys {
+		qk := dialect.QuoteIdentifier(key)
+		onParts[i] = quotedTable + "." + qk + " = src." + qk
+	}
+
+	updateParts := make([]string, len(updateColumns))
+	for i, col := range updateColumns {
+		qc := dialect.QuoteIdentifier(col)
+		if raw, ok := rawValues[col]; ok {
+			updateParts[i] = qc + " = " + raw
+		} else {
+			updateParts[i] = qc + " = src." + qc
+		}
+	}
+
+	insertCols := make([]string, len(columns))
+	insertVals := make([]string, len(columns))
+	for i, col := range columns {
+		qc := dialect.QuoteIdentifier(col)
+		insertCols[i] = qc
+		insertVals[i] = "src." + qc
+	}
+
+	return "MERGE INTO " + quotedTable + " USING (SELECT " + strings.Join(srcParts, ", ") +
+		") src ON (" + strings.Join(onParts, " AND ") +
+		") WHEN MATCHED THEN UPDATE SET " + strings.Join(updateParts, ", ") +
+		" WHEN NOT MATCHED THEN INSERT (" + strings.Join(insertCols, ", ") +
+		") VALUES (" + strings.Join(insertVals, ", ") + ")"
+}
+
 // Update 更新数据
 func (that *HoTimeDB) Update(table string, data Map, where Map) int64 {
 	processor := that.GetProcessor()