SQLDescribeCol

function SQLDescribeCol(

  StatementHandle: SQLHSTMT;

  ColumnNumber: SQLUSMALLINT;

  ColumnName: PSQLCHAR;

  BufferLength: SQLSMALLINT;

  var NameLength: SQLSMALLINT;

  var DataType: SQLSMALLINT;

  var ColumnSize: SQLULEN;

  var DecimalDigits: SQLSMALLINT;

  var Nullable: SQLSMALLINT

):SQLRETURN;