C# ODP.Net托管API-带字符串的数组绑定>；1000个字符

当使用ODP.Net托管API时，当使用数组绑定将数据插入VARCHAR2（4000）类型的列中，并且数组中行值的字符串长度大于1000个字符时，将引发以下异常：

ORA-01461:只能为插入到长列中绑定长值

我尝试使用此选项，但仍然遇到相同的问题：

p.OracleDbType = OracleDbType.Clob;

还尝试如下设置Varchar2长度的大小，但仍然存在相同的问题

p.OracleDbType = OracleDbType.Varchar2;
p.Size = 4000;

我也试过这个，但运气不好：

string sql = "INSERT INTO STAGING(\"COLUMN1\") VALUES (CAST(:COLUMN1 AS VARCHAR2(4000))";

有什么想法吗

这似乎是一个类似的问题：

更新 我怀疑可能存在某种字符集问题，这使得长度比预期的长，所以为了排除这种情况，我将我们试图插入数据的表的列长度减少到VARCHAR2（1000），假设这将使允许的最大字符长度为250-但情况并非如此。引发此异常之前工作的最大值仍然是1000

更新2 我发现了一个oracle修补程序，可以解决此问题。我将尝试获取此修补程序并进行验证

更新3 oracle补丁没有为我解决这个问题。我试图遍历所有参数绑定状态，但它们都表示成功

catch (Exception ex)
{
    foreach (OracleParameter p in cmd.Parameters)
    {
        foreach (var s in p.ArrayBindStatus)
        {
            if (s != OracleParameterStatus.Success)
            {

            }
        }
    }
}

更新4 这似乎是Oracle托管API中的一个bug，下面是一个可以重现该问题的示例类

namespace OracleBindError
{
    using Oracle.ManagedDataAccess.Client;

    using System.Data;
    using System.Linq;

    class Program
    {
        static void Main(string[] args)
        {
            string testTable = "BIND_TEST_TABLE";
            string connString = "[conn string here]";

            string dropTable =
@"DECLARE pEXISTS NUMBER;
BEGIN
  SELECT COUNT(*) INTO pEXISTS FROM USER_TABLES WHERE TABLE_NAME = '" + testTable + @"';

  IF(pEXISTS > 0) THEN
    EXECUTE IMMEDIATE 'DROP TABLE " + testTable + @"';
  END IF;

  EXECUTE IMMEDIATE 'CREATE TABLE " + testTable + @" (COLUMN1 VARCHAR2(4000), COLUMN2 VARCHAR2(4000))';
END;";

            string[] greaterThanOneThousand = new string[] {
                        "abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijkldfdffd",
            };

            string insertStatement = "INSERT INTO " + testTable + "(\"COLUMN1\",\"COLUMN2\") VALUES (:COLUMN1,:COLUMN2)";

            using (OracleConnection conn = new OracleConnection(connString))
            {
                conn.Open();

                OracleCommand dropCmd = new OracleCommand(dropTable, conn);
                dropCmd.ExecuteNonQuery();

                using (OracleCommand cmd = conn.CreateCommand())
                {
                    cmd.CommandText = insertStatement;
                    cmd.CommandType = CommandType.Text;
                    cmd.BindByName = true;
                    cmd.ArrayBindCount = greaterThanOneThousand.Length;

                    var p = new OracleParameter { ParameterName = "COLUMN1" };
                    p.OracleDbType = OracleDbType.Varchar2;
                    p.Value = greaterThanOneThousand.ToArray();
                    cmd.Parameters.Add(p);

                    var p2 = new OracleParameter { ParameterName = "COLUMN2" };
                    p2.OracleDbType = OracleDbType.Varchar2;
                    p2.Value = new string[] { null };
                    cmd.Parameters.Add(p2);

                    cmd.ExecuteNonQuery();
                }

                conn.Close();
            }
        }
    }
}

找到了可供选择的工作 如果我在参数中将OracleDbType从Varchar2更改为NVarchar2，它就会工作。

var p = new OracleParameter { ParameterName = "COLUMN1" };
p.OracleDbType = OracleDbType.NVarchar2;
p.Value = greaterThanOneThousand.ToArray();
cmd.Parameters.Add(p);

var p2 = new OracleParameter { ParameterName = "COLUMN2" };
p2.OracleDbType = OracleDbType.Varchar2;
p2.Value = new string[] { " " };
cmd.Parameters.Add(p2);

解决问题

---

解决方法是在.net端的参数中使用NVARCHAR2。

您正在将类型为“T”的数组赋值。然而，数据库希望它是VARCHAR2（4000），这相当于string。尝试将值转换为字符串

我假设基表不使用长数据类型，并且您的数组类型是字符串？基表列的类型是VARCHAR2（4000）。在本例中，T的类型是字符串。字符串数组中参数中的值。

namespace OracleBindError
{
    using Oracle.ManagedDataAccess.Client;

    using System.Data;
    using System.Linq;

    class Program
    {
        static void Main(string[] args)
        {
            string testTable = "BIND_TEST_TABLE";
            string connString = "[conn string here]";

            string dropTable =
@"DECLARE pEXISTS NUMBER;
BEGIN
  SELECT COUNT(*) INTO pEXISTS FROM USER_TABLES WHERE TABLE_NAME = '" + testTable + @"';

  IF(pEXISTS > 0) THEN
    EXECUTE IMMEDIATE 'DROP TABLE " + testTable + @"';
  END IF;

  EXECUTE IMMEDIATE 'CREATE TABLE " + testTable + @" (COLUMN1 VARCHAR2(4000), COLUMN2 VARCHAR2(4000))';
END;";

            string[] greaterThanOneThousand = new string[] {
                        "abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijkldfdffd",
            };

            string insertStatement = "INSERT INTO " + testTable + "(\"COLUMN1\",\"COLUMN2\") VALUES (:COLUMN1,:COLUMN2)";

            using (OracleConnection conn = new OracleConnection(connString))
            {
                conn.Open();

                OracleCommand dropCmd = new OracleCommand(dropTable, conn);
                dropCmd.ExecuteNonQuery();

                using (OracleCommand cmd = conn.CreateCommand())
                {
                    cmd.CommandText = insertStatement;
                    cmd.CommandType = CommandType.Text;
                    cmd.BindByName = true;
                    cmd.ArrayBindCount = greaterThanOneThousand.Length;

                    var p = new OracleParameter { ParameterName = "COLUMN1" };
                    p.OracleDbType = OracleDbType.Varchar2;
                    p.Value = greaterThanOneThousand.ToArray();
                    cmd.Parameters.Add(p);

                    var p2 = new OracleParameter { ParameterName = "COLUMN2" };
                    p2.OracleDbType = OracleDbType.Varchar2;
                    p2.Value = new string[] { null };
                    cmd.Parameters.Add(p2);

                    cmd.ExecuteNonQuery();
                }

                conn.Close();
            }
        }
    }
}

var p = new OracleParameter { ParameterName = "COLUMN1" };
p.OracleDbType = OracleDbType.NVarchar2;
p.Value = greaterThanOneThousand.ToArray();
cmd.Parameters.Add(p);

var p2 = new OracleParameter { ParameterName = "COLUMN2" };
p2.OracleDbType = OracleDbType.Varchar2;
p2.Value = new string[] { " " };
cmd.Parameters.Add(p2);