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【DM版本】:DM8(–03134283938-20221019-172201-20018)
【操作系统】：windows 10 64位
【CPU】:i5-10500
【问题描述】*：
【DmProvider】数据库存储char(36)字段，使用.net驱动，执行sql，得到的DataReader和DataTable中，获取此列类型为String，应该参照mysql，识别成System.Guid。
版本：DmProvider.1.1.0.15887
上一次与Guid相关的提问：https://eco.dameng.com/community/question/54509f40bd8f27f171ba98b912517623

现象:
表、视图获取字段信息时，执行sql获取DataReader，通过DataReader获取列的类型，无法识别GUID列，且无法将列改为GUID类型。
DmProvider对达梦数据库的GUID类型的默认CLR映射错误
调用:
- DbDataReader.GetFieldType()
- DataColumn.DataType

参考代码：
初始化sql

CREATE TABLE IF NOT EXISTS "p_GlobalParam"
(
"PARAMCODE" VARCHAR(128),
"PARAMVALUE" VARCHAR(128),
"SYSCODE" VARCHAR(128),
"CREATEDGUID" CHAR(36),
"CREATEDNAME" VARCHAR(128),
"CREATEDTIME" TIMESTAMP(0),
"GLOBALPARAMGUID" CHAR(36) NOT NULL,
"MODIFIEDGUID" CHAR(36),
"MODIFIEDNAME" VARCHAR(128),
"MODIFIEDTIME" TIMESTAMP(0),
"VERSIONNUMBER" TIMESTAMP(0) DEFAULT CURRENT_TIMESTAMP()  NOT NULL) STORAGE(ON "MAIN", CLUSTERBTR);

INSERT INTO  "p_globalparam" ("ParamCode", "ParamValue", "SysCode", "CreatedGUID", "CreatedName", "CreatedTime", "GlobalParamGUID", "ModifiedGUID", "ModifiedName", "ModifiedTime", "VersionNumber") 
    VALUES('core', '', 'SSO', NULL, NULL, '2022-01-19 17:33:01', '08d9db2e-af6a-48d4-8c18-0b0fd4e4b4d3', NULL, NULL, NULL, '2022-01-20 01:33:00');

.net 代码

internal static void GetColumnTypeFromDataReader()
        {
            var sql = "SELECT \"CREATEDGUID\"  FROM p_GlobalParam LIMIT 1;";

            using (var connection = new DmConnection(s_connectionString))
            {
                connection.Open();
                DmCommand cmd = new DmCommand();
                cmd.Connection = connection;
                cmd.CommandText = sql;

                var reader = cmd.ExecuteReader();
                var fieldName = reader.GetName(0);
                var fieldType = reader.GetFieldType(0);
                if (!string.Equals(fieldType.Name, "Guid", StringComparison.OrdinalIgnoreCase))
                    throw new Exception("CHAR(36)不能转换成System.Guid类型");
            }
        }

        internal static void GetColumnTypeFromDataTable()
        {
            var sql = "SELECT \"CREATEDGUID\"  FROM p_GlobalParam LIMIT 1;";

            using (var connection = new DmConnection(s_connectionString))
            {
                connection.Open();
                DmCommand cmd = new DmCommand();
                cmd.Connection = connection;
                cmd.CommandText = sql;

                var dt = new DataTable();
                var adapter = new DmDataAdapter(sql, s_connectionString);
                adapter.Fill(dt);

                var columns = dt.Columns;
                var col = columns[0];
                var fieldName = col.ColumnName;
                var fieldType = col.DataType;
                if (!string.Equals(fieldType.Name, "Guid", StringComparison.OrdinalIgnoreCase))
                    throw new Exception("CHAR(36)不能转换成System.Guid类型");
            }
        }

反编译，驱动代码，定位到的相关代码位置