Question

我收到一条错误消息：使用以下代码请求未实现或不合理的转换：

OdbcConnection oConn = new OdbcConnection();
oConn.ConnectionString = @"Driver={Oracle ODBC Driver};Data Source=*****;UID=********;PWD=******;DBQ=*****;DBA=R;APA=T;FEN=T;QTO=F;FRC=10;FDL=10;LOB=F;RST=T;FRL=T;MTS=F;CSR=F;PFC=10;TLO=0;";

oConn.Open();

string user = "ANYUSER";
string family = "ANYFAMILY";
DateTime date = DateTime.Today;

OdbcCommand FindCases = new OdbcCommand(@"select TABLE_CASE.ID_NUMBER, TABLE_USER.LOGIN_NAME
                                          from TABLE_CASE, TABLE_USER, TABLE_PRIVCLASS, TABLE_CONDITION, TABLE_PART_NUM
                                          where TABLE_CASE.CASE_ORIGINATOR2USER=TABLE_USER.OBJID and TABLE_CASE.CASE_STATE2CONDITION=TABLE_CONDITION.OBJID and TABLE_CASE.CASE_PRT2PART_INFO=TABLE_PART_NUM.OBJID
                                          and TABLE_USER.USER_ACCESS2PRIVCLASS=TABLE_PRIVCLASS.OBJID and TABLE_USER.LOGIN_NAME=? and TABLE_PART_NUM.FAMILY=? and TABLE_CONDITION.S_TITLE='CLOSED' and TABLE_CASE.CREATION_TIME > to_date(?,'MM/DD/YYYY HH:MI:SS AM')", oConn);

FindCases.CommandType = System.Data.CommandType.Text;
FindCases.Parameters.Add(@"user", OdbcType.Text, 4000).Value = user;
FindCases.Parameters.Add(@"family", OdbcType.Text, 4000).Value = family;
FindCases.Parameters.Add(@"date", OdbcType.DateTime, 4000).Value = date;

if (oConn.State == System.Data.ConnectionState.Open)
{
     try
     {
         OdbcDataReader readCases = FindCases.ExecuteReader(); //errors at this line

我在网上浏览过，我能找到的唯一建议是使用to_clob语句。要么我不明白它是如何工作的，或者不能解决问题。据我所知，不应该有任何数据类型的转换。 'user'字段是文本，'family'字段是文本，'date'字段是数据库中的DateTime。

任何想法都非常苛刻！

更新此代码有效：

OdbcCommand FindCases = new OdbcCommand(@"select TABLE_CASE.ID_NUMBER, TABLE_USER.LOGIN_NAME
                                                    from TABLE_CASE, TABLE_USER, TABLE_PRIVCLASS, TABLE_CONDITION, TABLE_PART_NUM
                                                    where TABLE_CASE.CASE_ORIGINATOR2USER=TABLE_USER.OBJID and TABLE_CASE.CASE_STATE2CONDITION=TABLE_CONDITION.OBJID and TABLE_CASE.CASE_PRT2PART_INFO=TABLE_PART_NUM.OBJID
                                                    and TABLE_USER.USER_ACCESS2PRIVCLASS=TABLE_PRIVCLASS.OBJID and TABLE_USER.LOGIN_NAME=? and TABLE_PART_NUM.FAMILY='Desktop' and TABLE_CONDITION.S_TITLE='CLOSED' and TABLE_CASE.CREATION_TIME > ?", oConn);

        FindCases.CommandType = System.Data.CommandType.Text;
        FindCases.Parameters.Add(@"user", OdbcType.Text, 4000).Value = user;
        //FindCases.Parameters.Add(@"family", OdbcType.Text, 4000).Value = family;
        FindCases.Parameters.Add(@"date", OdbcType.DateTime, 4000).Value = date;

更新（再次）

此代码也可以完美运行，但易受SQL注入攻击。

        OdbcCommand FindCases = new OdbcCommand(@"select TABLE_CASE.ID_NUMBER
                                                    from TABLE_CASE, TABLE_USER, TABLE_PRIVCLASS, TABLE_CONDITION, TABLE_PART_NUM
                                                    where TABLE_CASE.CASE_ORIGINATOR2USER=TABLE_USER.OBJID and TABLE_CASE.CASE_STATE2CONDITION=TABLE_CONDITION.OBJID and TABLE_CASE.CASE_PRT2PART_INFO=TABLE_PART_NUM.OBJID
                                                    and TABLE_USER.USER_ACCESS2PRIVCLASS=TABLE_PRIVCLASS.OBJID and TABLE_USER.LOGIN_NAME=? and TABLE_PART_NUM.FAMILY='" + family + "' and TABLE_CONDITION.S_TITLE='CLOSED' and TABLE_CASE.CREATION_TIME > ?", oConn);

        FindCases.CommandType = System.Data.CommandType.Text;
        FindCases.Parameters.Add(@"user", OdbcType.Text, 4000).Value = user; //field size 30, text
        //FindCases.Parameters.Add(@"family", OdbcType.Text, 4000).Value = family; //field size 20, text
        FindCases.Parameters.Add(@"date", OdbcType.DateTime, 4000).Value = date;

解

我没有意识到'文字'不是真正的类型。改用NVARCHAR就可以了：

        OdbcCommand FindCases = new OdbcCommand(@"select TABLE_CASE.ID_NUMBER
                                                    from TABLE_CASE, TABLE_USER, TABLE_CONDITION, TABLE_PART_NUM
                                                    where TABLE_CASE.CASE_ORIGINATOR2USER=TABLE_USER.OBJID and TABLE_CASE.CASE_STATE2CONDITION=TABLE_CONDITION.OBJID and TABLE_CASE.CASE_PRT2PART_INFO=TABLE_PART_NUM.OBJID
                                                    and TABLE_USER.LOGIN_NAME=? and TABLE_PART_NUM.FAMILY=? and TABLE_CONDITION.S_TITLE='CLOSED' and TABLE_CASE.CREATION_TIME > ?", oConn);

        FindCases.CommandType = System.Data.CommandType.Text;
        FindCases.Parameters.Add(@"user", OdbcType.NVarChar, 30).Value = user; //field size 30, text
        FindCases.Parameters.Add(@"family", OdbcType.NVarChar, 20).Value = family; //field size 20, text
        FindCases.Parameters.Add(@"date", OdbcType.DateTime, 4000).Value = date;

Answer 1

一些问题，猜测和建议......

TABLE_PART_NUM.FAMILY的确切DDL SQL类型是什么？

您是否尝试使用OdbcType.VarChar，OdbcType.NVarChar甚至OdbcType.NText代替OdbcType.Text？

此外，请注意，默认情况下，NVARCHAR2大小以字符为单位，但VARCHAR2以字节为单位 - 可能＆＃34; 4000＆＃34;在您的代码中被解释为4000 字符，超过了4000 字节的字符数据的最大字段宽度。尝试使用2000甚至更低的数字仅用于测试目的。

尝试从SQL Developer执行查询。你有什么问题吗？

你使用任何＆＃34;不寻常的＆＃34;数据库中的字符编码？你可以执行......

SELECT * FROM NLS_DATABASE_PARAMETERS WHERE PARAMETER LIKE '%CHARACTERSET';

...并查看NLS_CHARACTERSET的VARCHAR2编码和NLS_NCHAR_CHARACTERSET的NVARCHAR2编码。

您的ODBC驱动程序和Oracle服务器的确切版本是什么？他们匹配吗？

如果尝试使用等效的ODP.NET代码，是否会出现此问题？

Answer 2

我怀疑这是因为你正在使用它：

TABLE_CASE.CREATION_TIME > to_date(?,'MM/DD/YYYY HH:MI:SS AM')

需要字符串参数，但您已传入DateTime值：

FindCases.Parameters.Add(@"date", OdbcType.DateTime, 4000).Value = date;

我怀疑您可以更改要使用的SQL：

TABLE_CASE.CREATION_TIME > ?

Answer 3

使用以下示例代码。你需要创建临时LOB。这对我有用

using System.Data.OracleClient;

OracleConnection objConnection = new OracleConnection();
OracleCommand objCommand = new OracleCommand();
try
{
    objConnection.ConnectionString = System.Configuration.ConfigurationManager.AppSettings["YourConnectionString"].ToString();

    if (objConnection.State != System.Data.ConnectionState.Open)
    {
        objConnection.Open();
    }

    objCommand.Connection = objConnection;

    //Create Temporary LOB @Start
    //Error Without Temp LOB { ORA-01460: unimplemented or unreasonable conversion requested }
    objCommand.CommandText = "DECLARE dpBlob BLOB; BEGIN DBMS_LOB.CREATETEMPORARY(dpBlob, False, 0); :tmpBlob := dpBlob; END;";
    objCommand.Parameters.Add(new OracleParameter("tmpBlob", OracleType.Blob)).Direction = System.Data.ParameterDirection.Output;
    objCommand.ExecuteNonQuery();
    OracleLob tempLob = default(OracleLob);
    tempLob = (OracleLob)objCommand.Parameters[0].Value;
    tempLob.BeginBatch(OracleLobOpenMode.ReadWrite);
    tempLob.EndBatch();
    objCommand.Parameters.Clear();
    //Create Temporary LOB @End

    objCommand.CommandType = System.Data.CommandType.StoredProcedure;
    objCommand.CommandText = "INSERT_BLOB";

    objCommand.Parameters.AddWithValue("IN_USERNAME", "Sample Name");
    objCommand.Parameters.AddWithValue("IN_UPLOADED_BY", "Sample Name");

    string excelFileName = FileUpload1.PostedFile.FileName;
    int intlength = FileUpload1.PostedFile.ContentLength;

    Byte[] byteData = new Byte[intlength];
    FileUpload1.PostedFile.InputStream.Read(byteData, 0, intlength);

    objCommand.Parameters.AddWithValue("IN_ATTACH_FILE_ORIGINAL", excelFileName);
    objCommand.Parameters.Add("IN_ATTACH_BLOB_ORIGINAL", OracleType.Blob).Value = tempLob;

    objCommand.ExecuteNonQuery();

}
catch (Exception ex)
{
}
finally
{
    objCommand.Parameters.Clear();
    if (objConnection.State != System.Data.ConnectionState.Closed)
        objConnection.Close();
}

Oracle数据库 - ORA-01460 - 请求未实现或不合理的转换

3 个答案: