crystal reports code 128 DATABASE TABLES in Objective-C

Creation DataMatrix in Objective-C DATABASE TABLES

CHAPTER 10 DATABASE TABLES
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NAME SEGCOLLENGTH ------------------------- -----------SYS_NC_OID$ 16 SYS_NC_ROWINFO$ 1 NAME 30 DOB 7 HOME_ADDRESS 1 SYS_NC00006$ 30 SYS_NC00007$ 30 SYS_NC00008$ 2 SYS_NC00009$ 22 WORK_ADDRESS 1 SYS_NC00011$ 30 SYS_NC00012$ 30 SYS_NC00013$ 2 SYS_NC00014$ 22 14 rows selected. This looks quite different from what DESCRIBE tells us. Apparently, there are 14 columns in this table, not 4. In this case, they are: SYS_NC_OID$: This is the system-generated object ID of the table. It is a unique RAW(16) column. It has a unique constraint on it, and there is a corresponding unique index created on it as well. SYS_NC_ROWINFO$: This is the same magic function we observed with the nested table. If we select that from the table, it returns the entire row as a single column:
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ops$tkyte@ORA11GR2> select sys_nc_rowinfo$ from people; SYS_NC_ROWINFO$(NAME, DOB, HOME_ADDRESS(CITY,STREET,STATE,ZIP), WORK_ADDRESS ---------------------------------------------------------------------------PERSON_TYPE('Tom', '15-MAR-65', ADDRESS_TYPE('Reston', '123 Main Street', 'Va', 45678), ADDRESS_TYPE('Redwood', '1 Oracle Way', 'Ca', 23456) NAME, DOB: These are the scalar attributes of our object table. They are stored much as we would expect, as regular columns. HOME_ADDRESS, WORK_ADDRESS: These are magic functions as well. They return the collection of columns they represent as a single object. These consume no real space except to signify NULL or NOT NULL for the entity. SYS_NCnnnnn$: These are the scalar implementations of our embedded object types. Since the PERSON_TYPE had the ADDRESS_TYPE embedded in it, Oracle needed to make room to store them in the appropriate type of columns. The systemgenerated names are necessary since a column name must be unique, and there is nothing stopping us from using the same object type more than once as we did here. If the names were not generated, we would have ended up with the ZIP column twice.
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So, just like with the nested table, there is a lot going on here. A pseudo primary key of 16 bytes was added, there are virtual columns, and an index created for us. We can change the default behavior with regard to the value of the object identifier assigned to an object, as we ll see in a moment. First, let s look at the full verbose SQL that would generate our table for us. This was generated using EXP/IMP since I wanted to easily see the dependent objects, including all of the SQL needed to re-create this particular object instance. This was achieved via the following:
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CHAPTER 10 DATABASE TABLES
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$ exp userid=/ tables=people rows=n Export: Release 11.2.0.1.0 - Production on Thu Mar 18 10:17:52 2010 Copyright (c) 1982, 2009, Oracle and/or its affiliates. All rights reserved. Connected to: Oracle Database 11g Enterprise Edition Release 11.2.0.1.0 - Production With the Partitioning, OLAP, Data Mining and Real Application Testing options Export done in US7ASCII character set and AL16UTF16 NCHAR character set server uses WE8MSWIN1252 character set (possible charset conversion) Note: table data (rows) will not be exported About to export specified tables via Conventional Path ... . . exporting table PEOPLE Export terminated successfully without warnings. $ imp userid=/ indexfile=people.sql full=y Import: Release 11.2.0.1.0 - Production on Thu Mar 18 10:18:10 2010 Copyright (c) 1982, 2009, Oracle and/or its affiliates. All rights reserved. Connected to: Oracle Database 11g Enterprise Edition Release 11.2.0.1.0 - Production With the Partitioning, OLAP, Data Mining and Real Application Testing options Export import import Import file created by EXPORT:V11.02.00 via conventional path done in US7ASCII character set and AL16UTF16 NCHAR character set server uses WE8MSWIN1252 character set (possible charset conversion) terminated successfully without warnings.
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Review of the people.sql file that results would show this: CREATE TABLE "OPS$TKYTE"."PEOPLE" OF "PERSON_TYPE" OID '82149DEE11C135AAE040A8C0FC011326' OIDINDEX (PCTFREE 10 INITRANS 2 MAXTRANS 255 STORAGE(INITIAL 65536 NEXT 1048576 MINEXTENTS 1 FREELISTS 1 FREELIST GROUPS 1 BUFFER_POOL DEFAULT) TABLESPACE "USERS") PCTFREE 10 PCTUSED 40 INITRANS 1 MAXTRANS 255 STORAGE(INITIAL 65536 NEXT 1048576 MINEXTENTS 1 FREELISTS 1 FREELIST GROUPS 1 BUFFER_POOL DEFAULT) TABLESPACE "USERS" LOGGING NOCOMPRESS ; ALTER TABLE "OPS$TKYTE"."PEOPLE" MODIFY ("SYS_NC_OID$" DEFAULT SYS_OP_GUID()) ; This gives us a little more insight into what is actually taking place here. We see the OIDINDEX clause clearly now, and we see a reference to the SYS_NC_OID$ column. This is the hidden primary key of the table. The function SYS_OP_GUID is the same as the function SYS_GUID. They both return a globally unique identifier that is a 16-byte RAW field.
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