在Oracle中使用XML保存数据

Question

I use the following code for saving.Updating records to Oracle,

OracleConnection con = new OracleConnection(constr);
con.Open();

// Create the command.
OracleCommand cmd = new OracleCommand("", con);
cmd.CommandText = "<?xml version=\"1.0\"?>\n" +
    "<ROWSET>\n" +
    " <MYROW>\n" +
    " <FIELD1>2</FIELD1>\n" +
    " <FIELD2>zafar</FIELD2>\n" +
    " </MYROW>\n" +
    "</ROWSET>\n";

// Set the XML save properties.
KeyColumnsList = new string[1];
KeyColumnsList[0] = "FIELD1";
UpdateColumnsList = new string[1];
UpdateColumnsList[0] = "FIELD2";

cmd.XmlSaveProperties.KeyColumnsList = KeyColumnsList;
cmd.XmlSaveProperties.UpdateColumnsList = UpdateColumnsList;
cmd.XmlSaveProperties.RowTag = "MYROW";
cmd.XmlSaveProperties.Table = "testconn";
cmd.XmlSaveProperties.Xslt = null;
cmd.XmlSaveProperties.XsltParams = null;
rows = cmd.ExecuteNonQuery();

Console.WriteLine("rows: " + rows);

In the Field2 column I want to use select user from dual . I am not able to save current DB user.

Answer 1

The structure of data in the CommandText assumes that all values are literals. There is no way to have it recognize an inner query or expression. If you want to query the user you will have to do it separately and incorporate that into the data. This may be possible with the Xslt and XsltParams clauses.