尝试从 U2 数据文件中选择 * 时, 我收到以下消息 。
[U2][UCINET][UNIDATA]:Multi-value or multi-subvalue are not supported in this version
"
如果我只选择一个字段,我得不到错误,是否有一个版本无法获取此错误 。
您需要在 U2ConnectryStringBilder 类中设置属性“ 第一游牧形式=false ” 。 例如 :
U2ConnectionStringBuilder conn_str = new U2ConnectionStringBuilder();
conn_str.UserID = "user";
conn_str.Password = "pass";
conn_str.Server = "localhost";
conn_str.Database = "XDEMO";
conn_str.ServerType = "UNIVERSE";
conn_str.FirstNormalForm = false;
U2Connection con = new U2Connection();
con.ConnectionString = conn_str.ToString();
con.Open();
.......
For UniVerse Database: SQL Statement : SELECT FNAME,PRICE,BUY_DATE FROM UNNEST CUSTOMER ON ORDERS (PRICE and BUY_DATE are multi-valued attributes)
For UniData Database: SQL Statement : SELECT * FROM STUDENT UNNEST NL_ALL CGA (FNAME,...,SEMESTER are multi-valued attributes)
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