Oracle for Software Developers. What is a relational database? Data is represented as a set of two-...

Oracle for Software Oracle for Software DevelopersDevelopers

What is a relational database?What is a relational database?

Data is represented as a set of two-dimensional tables. (rows and columns)

One or more of the columns is defined as a primary key and this column or combination of columns will uniquely define the row.

Tables are related by the shared column values.

What is a relational database? What is a relational database? (continued)(continued)

Operations in a relational database are processed in groups of data.

The output of the operation is itself a table (or relation or result set), which can be processed further by relational operations.

Relational TablesRelational Tables

vac ioc1

vac ioc2

ps ioc2

ioc1 Test 1 Bldg A 128.0.0.1

Oracle databaseOracle database

Two basic concepts must be understood in order to make sense of the Oracle architecture: databases and instances.

A database is a set of data as defined previously. A database instance is a set of memory structures

and background processes shared by all users that access a database.

You access the Oracle database through the instance.

Oracle ArchitectureOracle Architecture

SGARedo log bufferDatabase buffer cacheShared pool

LGWR DBW0PMON SMON RECO CKPT ARC0

Threads

Oracle Database

SGARedo log bufferDatabase buffer cacheShared pool

LGWR DBW0PMON SMON RECO CKPT ARC0

Threads

Oracle Database

SQL - Interface to the SQL - Interface to the databasedatabase

SQL is a data sub-language: the purpose of SQL is to provide an interface to a relational database such as Oracle. All SQL statements are instructions to the database.

SQL*PLUSSQL*PLUS

Oracle utility that allows SQL execution against an Oracle database.

Useful for database administrators, software developers and end-users.

Available as a client tool on the desktop or accessible at the OS command line interface for both Unix an NT.

USERS and SCHEMAS TABLE INDEX VIEW PACKAGE PACKAGE BODY PROCEDURE SEQUENCE SYNONYM TYPE

Users and SchemasUsers and Schemas

User - A user account is not a physical structure in the database, but it does have important relationships to the objects in the database; users own database objects.

Schema - The set of objects owned by a user account.

Tables, Columns, and DatatypesTables, Columns, and Datatypes

Table – The storage mechanism for data within an Oracle database that represents a set of records of the same structure, also called rows.

Column - A table contains columns which are descriptive attributes and have a defined data type.

Tables, Columns, and Datatypes Tables, Columns, and Datatypes (continued)(continued)

VARCHAR2(size) Variable-length character string having maximum length size bytes. Maximum size is 4000.

NUMBER( p,s) Number having precision p and scale s. The precision p can range from 1 to 38. The scale s can range from -84 to 127.

DATE Valid date range from January 1, 4712 BC to December 31, 9999 AD.

ConstraintsConstraints

A constraint ensures that a specific condition is meet by all rows in a table.

PRIMARY KEY - Specifies that column(s) are the table prime key and must have unique values. Index is automatically generated for column.

NULL/NOT NULL - NOT NULL specifies that a column must have some value. NULL (default) allows NULL values in the column.

Constraints Constraints (continued)(continued)

UNIQUE - Specifies that column(s) must have unique values

FOREIGN KEY - Specifies that column(s) are a table foreign key and will use referential uniqueness of parent table. Index is automatically generated for column. Foreign keys allow deletion cascades and table / business rule validation.

Constraints Constraints (continued)(continued)

DEFAULT - Specifies some default value if no value entered by user.

DISABLE - You may suffix DISABLE to any other constraint to make Oracle ignore the constraint, the constraint will still be available to applications/tools and you can enable the constraint later if required.

IndexesIndexes

An index is a database structure used to quickly find a row in a table.

An index entry consists of a key value and a RowId. The key value is the value of a column or columns in a row.

SynonymsSynonyms

Mask the underlying complexity of the path to an object.

Can be used to provide pointers for tables, views, procedures, functions, packages, and sequences.

ViewsViews

A view appears to be a table containing columns and is queried in the same manner that a table is queried. Conceptually, a view can be thought of as a mask overlaying one or more tables, such that the columns in the view are found in one or more underlying tables.

User viewsUser views

USER_TABLESUSER_TAB_COLUMNSUSER_INDEXESUSER_SYNONYMSUSER_VIEWSUSER_SEQUENCES

DDLDDL

Create tableAlter tableDrop tableCreate indexCreate synonymCreate sequence

SQL CommandsSQL Commands

SELECTUPDATEINSERTDELETE

Data ConsistencyData Consistency

RollbackCommitSet Transaction

Connecting to the databaseConnecting to the database

Net8 – Oracle transparent protocol network layer.

Connecting to the database Connecting to the database (continued)(continued)

Client configuration via tnsnames.ora file. iroquoisdbprod = (DESCRIPTION = (ADDRESS_LIST = (ADDRESS = (COMMUNITY = tcp.world) (PROTOCOL = TCP) (Host = IROQUOISDB) (Port = 1521) ) ) (CONNECT_DATA = (SID = PROD) (GLOBAL_NAME = PROD.world) ) )

Connecting to the database Connecting to the database (continued)(continued)

Future plans are to go to a LDAP model for SQL*NET name resolution.

Embedded SQLEmbedded SQL

C/C++ - Pro*CJava – JDBC SQLJPERL - DBI FORTRAN – Pro*FortranOCIOracle Tools (Developer 2000,PL/SQL)ODBC

ResourcesResources

http://w3.one.net/~jhoffman/sqltut.htmhttp://cisnet.baruch.cuny.edu/holowczak/ora

cle/sqlplus/tutorial.htmlhttp://www.spnc.demon.co.uk/ora_sql/sqlm

ain.htm

http://technet.oracle.com/

Resources Resources (continued)(continued)

Jeff Pattonpattonjg@sns.gov(865) 241-8093

Oracle for Software Developers. What is a relational database? Data is represented as a set of two-...

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