C# 长度超过40万的文本，保存到oracle clob字段中去

protected void Page_Load(object sender, EventArgs e)
{
if (this.Request.Files.Count == 0)
{
return;
}
HttpPostedFile postedFile = this.Request.Files[0];
int ContentLength = postedFile.ContentLength;
if (ContentLength == 0)
return;

byte[] bytes = new byte[ContentLength];

//把上传的文件中的XML文本读出到string
postedFile.InputStream.Read(bytes, 0, ContentLength);
string tempStr = System.Text.Encoding.Default.GetString(bytes);

//获取使用 Little-Endian 字节顺序的 UTF-16 格式的编码。
//因为OracleLob Clob存储是以UTF-16的合格，如果不转换就会保存成乱码
bytes = System.Text.Encoding.Unicode.GetBytes(tempStr);
ContentLength = bytes.Length;

string connString = "Data Source=owen;User Id=userid;Password=password;Integrated Security=no;";
System.Data.OracleClient.OracleConnection conn = new OracleConnection(connString);
try
{
conn.Open();
OracleTransaction trans = conn.BeginTransaction();

OracleCommand command = new OracleCommand();
command.Transaction = trans;
command.Connection = conn;
command.CommandType = CommandType.Text;

//获取临时clob
command.CommandText = "declare xx clob; begin dbms_lob.createtemporary(xx, false, 0); :templob := xx; end;";
command.Parameters.Add(new OracleParameter("templob", OracleType.Clob)).Direction = ParameterDirection.Output;
command.ExecuteNonQuery();

OracleLob tmpclob = (OracleLob)command.Parameters[0].Value;
//end 获取临时clob
tmpclob.Write(bytes, 0, ContentLength);
tmpclob.Position = 0;
trans.Commit();

command.Parameters.Clear();
command.CommandText = "pro_test1";
command.CommandType = CommandType.StoredProcedure;

command.Parameters.Add(new OracleParameter("name", Guid.NewGuid().ToString()));
command.Parameters.Add(new OracleParameter("clob1", OracleType.Clob, ContentLength,
ParameterDirection.Input, true, 0, 0, "", DataRowVersion.Current, tmpclob));

command.ExecuteNonQuery();

this.Response.Write("insert OK");

}
catch (Exception ex)
{
this.Response.Write(ex.Message);
}
finally
{
if (conn != null)
conn.Close();
}
}

数据库内容

create table TEST1
(
NAME VARCHAR2(100),
UPDATED_TIME DATE default sysdate,
ROWS_COUNT NUMBER default 0,
CLOB1 CLOB
)
/
create or replace procedure pro_test1(name in varchar2,clob1 in clob)
as
theXmlParser dbms_xmlparser.Parser;
theXmlDoc dbms_xmldom.DOMDocument;
theXmlNodeList dbms_xmldom.DOMNodeList;
rowsCount number(10);
begin
theXmlParser := dbms_xmlparser.newParser;
dbms_xmlparser.parseclob(theXmlParser, clob1);
theXmlDoc := dbms_xmlparser.getDocument(theXmlParser);

theXmlNodeList := dbms_xslprocessor.selectNodes(dbms_xmldom.makeNode(theXmlDoc),'/table/row');
rowsCount := dbms_xmldom.getLength(theXmlNodeList);

insert into test1 (name,clob1,rows_count) values (name,clob1,rowsCount);
commit;
end pro_test1;
/