C#: Pass a user-defined type to a Oracle stored procedure

Question

With reference to Oracle: Variable number of parameters to a stored procedure

I have s stored procedure to insert multiple Users into a User table. The table is defi

Answer 1

After many false starts, this post here saved my bacon (binding to a UDT of TABLE OF VARCHAR2(100)).

Salient points

• Create a class to hold an Array of of the nested / UDT type (i.e. an Array of string for your varchar2(100))
  • The class must implement the IOracleCustomType and INullable interfaces.
  • It also needs a property to hold the array (i.e. string[]), and the property must be marked with the OracleArrayMapping attribute.
• Create a second UDT Factory class which implements the IOracleArrayTypeFactory, IOracleCustomTypeFactory interfaces. It needs the following methods
  • CreateObject - creates a new object of the storage class
  • CreateArray - allocates the array of strings to be set in the storage class
  • CreateStatusArray - a status per row is retained
• The factory class must also be marked with OracleCustomTypeMapping("SCHEMA.UDT_TYPE") where SCHEMA.UDT_TYPE matches your UDT type, viz CREATE TYPE SCHEMA.UDT_TYPE AS TABLE OF VARCHAR2(100)

By comparison, the bind on the parameter is straightforward:

   var oracleArray = new MyArrayStorageClass
      {
         Array = new string[] {"Hello", "World"}
      };
   command.CommandType = CommandType.StoredProcedure;
   var param = new OracleParameter("ip_parameterName", OracleDbType.Array)
      {
         // Case sensitive match to the `OracleCustomTypeMapping` on the factory
         UdtTypeName = "SCHEMA.UDT_TYPE", 
         Value = oracleArray,
         Direction = ParameterDirection.Input,
      };
   command.Parameters.Add(param);