ORA-1461 与托管 ODP.Net

Question

我们最近将我们的解决方案升级到新的托管 ODP.Net（v4.121.2.0，从 v4.121.1.0 开始）并且当字段在 1001 之间时更新到 CLOB 字段时遇到了问题和 4000 个字符。当您尝试这样做时，会从 ODP.Net 中抛出错误 ORA-1461。

运行相同的代码和数据，使用早期版本的 ODP.Net 并且工作正常。此外，您可以插入包含 1001 和 4000 个字符的记录，只是无法更新它们。

我用 C# 创建了一个示例程序来演示该问题。该程序执行以下操作：

它在数据库
它创建一个内存中的 .Net DataSet 对象来匹配。
在 CLOB 字段中使用 1400 个字符在 DataSet 中创建一条新记录。
使用 INSERT 语句将 DataSet 保存到数据库。
用一些新数据更新 DataSet 中的 CLOB 字段，同样是 1400 个字符的数据。
将 DataSet 保存到数据库，并抛出 ORA-1461。

我没有 Oracle 支持帐户，那么您在哪里向 Oracle 报告 ODP.Net 问题？

演示问题的示例 C# 代码：

using System;
using System.Data;
using System.Data.Common;
using System.Diagnostics;
using Oracle.ManagedDataAccess.Client;

class CLOBTest
{
    string _TableName = "CLOBTEST";
    string _ServerName = "servername";
    string _UserName = "username";
    string _Password = "password";

    public void CLOBTest1()
    {
        // Create a physical data table, if needed, in the Oracle DB that has the CLOB column
        CreateTable();

        // Create a dataset for the CLOBTEST table, fill it with a new row
        DataSet CLOBInfo = BuildCLOBTestDataSet();
        DataTable CLOBTable = CLOBInfo.Tables[_TableName];
        DataRow CLOBRow = CLOBTable.NewRow();
        CLOBRow["ACTION_CODE"] = DateTime.Now.ToString("s");
        CLOBRow["DESCRIPTION"] = "CLOB Slim Test";

        // The size of text in the CLOB field is critical to reproducing this defect.
        // It *only* happens when the field has between 1001 and 4000 characters.
        int LOBFieldSize = 1400;
        string CLOBText = DateTime.Now.ToString("s") + " " + new string('-', LOBFieldSize);
        CLOBRow["SCRIPT_TEXT"] = CLOBText.Substring(0, LOBFieldSize);
        CLOBTable.Rows.Add(CLOBRow);

        // Add that row to the DB, and then mark the DS with AcceptChanges
        InsertRow(CLOBInfo);

        // Update that row with some new data.
        CLOBText = DateTime.Now.ToString("s") + " :: " + CLOBText;
        CLOBRow["SCRIPT_TEXT"] = CLOBText.Substring(0, LOBFieldSize);

        // Error (ORA-1461) happens in the UPDATE when the CLOB has 1001 - 4000 characters in it.
        UpdateRow(CLOBInfo);
    }

    private void CreateTable()
    {
        if (TableExists())
            return;

        using (OracleConnection oc = OpenConnection())
        {
            using (OracleCommand ocmd = oc.CreateCommand())
            {
                string SQL = "CREATE TABLE " + _TableName + " (ACTION_CODE VARCHAR2(30) NOT NULL, DESCRIPTION VARCHAR2(50) NOT NULL, SCRIPT_TEXT CLOB, CONSTRAINT CLOBTEST_PK PRIMARY KEY (ACTION_CODE))";
                ocmd.CommandText = SQL;
                ocmd.ExecuteNonQuery();
                AddLogMessage("Table created.");
            }
        }
    }

    private bool TableExists()
    {
        using (OracleConnection oc = OpenConnection())
        {
            using (OracleCommand ocmd = oc.CreateCommand())
            {
                string SQL = "SELECT COUNT(*) FROM USER_TABLES WHERE TABLE_NAME = '" + _TableName + "'";
                ocmd.CommandText = SQL;
                object teRaw = ocmd.ExecuteScalar();
                bool te = (bool)(int.Parse(teRaw.ToString()) > 0);
                AddLogMessage("Table exists? " + te.ToString());
                return te;
            }
        }
    }

    private void InsertRow(DataSet CLOBInfo)
    {
        string SQL = "INSERT INTO " + _TableName + " (ACTION_CODE, DESCRIPTION, SCRIPT_TEXT) VALUES (:pACTION_CODE, :pDESCRIPTION, :pSCRIPT_TEXT)";
        using (OracleConnection oc = OpenConnection())
        {
            using (OracleDataAdapter oda = new OracleDataAdapter())
            {
                using (OracleCommand ocmd = oc.CreateCommand())
                {
                    CreateDataParameters(ocmd);

                    ocmd.CommandText = SQL;
                    oda.InsertCommand = ocmd;

                    DataRow[] updRows = CLOBInfo.Tables[_TableName].Select(null, null, DataViewRowState.Added);
                    if (updRows.Length > 0)
                    {
                        int rc = oda.Update(updRows);
                        CLOBInfo.AcceptChanges();
                        AddLogMessage("Row inserted into CLOBTEST. rc = " + rc.ToString());
                    }
                    else
                        AddLogMessage("No rows to insert.");
                }
            }
        }
    }

    private void UpdateRow(DataSet CLOBInfo)
    {
        string SQL = "UPDATE " + _TableName + " SET ACTION_CODE = :pACTION_CODE, DESCRIPTION = :pDESCRIPTION, SCRIPT_TEXT = :pSCRIPT_TEXT WHERE ACTION_CODE = :pOLDACTION_CODE";
        using (OracleConnection oc = OpenConnection())
        {
            using (OracleDataAdapter oda = new OracleDataAdapter())
            {
                using (OracleCommand ocmd = oc.CreateCommand())
                {
                    ocmd.CommandText = SQL;
                    CreateDataParameters(ocmd);

                    OracleParameter kp = new OracleParameter();
                    kp.ParameterName = "pOLDACTION_CODE";
                    kp.SourceColumn = "ACTION_CODE";
                    kp.SourceVersion = DataRowVersion.Original;
                    ocmd.Parameters.Add(kp);

                    oda.UpdateCommand = ocmd;
                    DataRow[] updRows = CLOBInfo.Tables[_TableName].Select(null, null, DataViewRowState.ModifiedCurrent);
                    if (updRows.Length > 0)
                    {
                        int rc = oda.Update(updRows);
                        CLOBInfo.AcceptChanges();
                        AddLogMessage("CLOBTEST row updated. rc = " + rc.ToString());
                    }
                    else
                        AddLogMessage("No rows to update.");
                }
            }
        }
    }

    private void CreateDataParameters(OracleCommand ocmd)
    {
        OracleParameter pActionCode = new OracleParameter();
        pActionCode.ParameterName = "pACTION_CODE";
        pActionCode.SourceColumn = "ACTION_CODE";
        ocmd.Parameters.Add(pActionCode);

        OracleParameter pDescription = new OracleParameter();
        pDescription.ParameterName = "pDESCRIPTION";
        pDescription.SourceColumn = "DESCRIPTION";
        ocmd.Parameters.Add(pDescription);

        OracleParameter pScriptText = new OracleParameter();
        pScriptText.ParameterName = "pSCRIPT_TEXT";
        pScriptText.SourceColumn = "SCRIPT_TEXT";
        ocmd.Parameters.Add(pScriptText);
    }

    private DataSet BuildCLOBTestDataSet()
    {
        DataSet ads = new DataSet();
        DataTable at = new DataTable("CLOBTEST");
        DataColumn ac = at.Columns.Add("ACTION_CODE", typeof(string));
        at.Columns.Add("DESCRIPTION", typeof(string));
        at.Columns.Add("SCRIPT_TEXT", typeof(string));
        at.PrimaryKey = new DataColumn[] { ac };
        ads.Tables.Add(at);
        return ads;
    }

    private OracleConnection OpenConnection()
    {
        OracleConnection oc = null;
        try
        {
            OracleClientFactory ocf = new OracleClientFactory();
            DbConnectionStringBuilder csb = ocf.CreateConnectionStringBuilder();
            csb["Data Source"] = _ServerName;
            csb["User ID"] = _UserName;
            csb["Password"] = _Password;
            string cs = csb.ConnectionString;
            oc = new OracleConnection(cs);
            oc.Open();
            AddLogMessage("Connection opened.");
        }
        catch (Exception ex)
        {
            AddLogMessage("Error Opening Connection! " + ex.Message);
            throw;
        }
        return oc;
    }

    private void AddLogMessage(string msg)
    {
        Debug.WriteLine(string.Format("{0:T} - {1}", DateTime.Now, msg));
    }
}

Answer 1

此线程中显示了两个解决方法：https://community.oracle.com/thread/3649551

解决方法一：

将您的 CLOB 参数配置为 OracleDbType.Clob 和 ParameterDirection.InputOutput.

解决方法二：

将您的 CLOB 参数配置为 OracleDbType.Clob 并将值明确设置为 OracleClob 对象。

修复：

Oracle 现在已知该错误，因此希望尽快发布修复版本。

编辑： Patch 20361140 应该修复它。

ORA-1461 与托管 ODP.Net

ORA-1461 with Managed ODP.Net

c#

oracle

odp.net

解决方法一：

解决方法二：

修复：