Oracle数据库 - ORA-01460 - 请求未实现或不合理的转换

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

我在网上看了一下,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.

任何想法都非常贬值!

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)

虽然易受SQL注入攻击,但此代码也可以完美运行.

        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"文本"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...

确切的 DDL SQL 类型是什么TABLE_PART_NUM.FAMILY？

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

另请注意，默认情况下，NVARCHAR2 大小以字符为单位，但 VARCHAR2 以字节为单位 - 也许代码中的“4000”被解释为 4000 个字符，超过了 4000 个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。你那里有什么问题吗？

您的数据库中是否使用了任何“不寻常”的字符编码？您可以执行...

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

...并查看NLS_CHARACTERSETVARCHAR2 编码和NLS_NCHAR_CHARACTERSETNVARCHAR2 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？

如果您尝试使用等效的 ODP.NET 代码，您是否会遇到此问题？