Table-Valued Parameter Metadata for Prepared Statements
An application can obtain metadata for a prepared procedure call through SQLNumParams and SQLDescribeParam. For table-valued parameters, DataTypePtr is set to SQL_SS_TABLE. Additional metadata is available through SQLGetDescField for SQL_CA_SS_TYPE_NAME, SQL_CA_SS_CATALOG_NAME, and SQL_CA_SS_SCHEMA_NAME.
SQL_CA_SS_TYPE_NAME, SQL_CA_SS_CATALOG_NAME, and SQL_CA_SS_SCHEMA_NAME can be used with SQLColumns to obtain column metadata for table types associated with table-valued parameters. In this case, SQL_SOPT_SS_NAME_SCOPE must be set to SQL_SS_NAME_SCOPE_TABLE_TYPE before SQLColumns is called. SQL_SOPT_SS_NAME_SCOPE should then be set back to the default value, SQL_SS_NAME_SCOPE_TABLE, when the application has finished retrieving table-valued parameter column metadata.
SQL_CA_SS_TYPE_NAME , SQL_CA_SS_CATALOG_NAME, and SQL_CA_SS_SCHEMA_NAME can also be used with CLR user-defined type parameters.
You cannot obtain table-valued parameter metadata for prepared statements that are not stored procedure calls. If you try to do this, the application returns SQL_ERROR with SQLSTATE 42000 and the message "Syntax error or access violation".