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getting message: oci_execute(): ORA-00942: table or view does not exist

Replace your ./application/config/database.php with this one.

PHP Code:
('BASEPATH') OR exit('No direct script access allowed');

| -------------------------------------------------------------------
| -------------------------------------------------------------------
| This file will contain the settings needed to access your database.
| For complete instructions please consult the 'Database Connection'
| page of the User Guide.
| -------------------------------------------------------------------
| -------------------------------------------------------------------
|    ['dsn']      The full DSN string describe a connection to the database.
|    ['hostname'] The hostname of your database server.
|    ['username'] The username used to connect to the database
|    ['password'] The password used to connect to the database
|    ['database'] The name of the database you want to connect to
|    ['dbdriver'] The database driver. e.g.: mysqli.
|            Currently supported:
|                 cubrid, ibase, mssql, mysql, mysqli, oci8,
|                 odbc, pdo, postgre, sqlite3, sqlsrv
|    ['dbprefix'] You can add an optional prefix, which will be added
|                 to the table name when using the  Query Builder class
|    ['pconnect'] TRUE/FALSE - Whether to use a persistent connection
|    ['db_debug'] TRUE/FALSE - Whether database errors should be displayed.
|    ['cache_on'] TRUE/FALSE - Enables/disables query caching
|    ['cachedir'] The path to the folder where cache files should be stored
|    ['char_set'] The character set used in communicating with the database
|    ['dbcollat'] The character collation used in communicating with the database
|                 NOTE: For MySQL and MySQLi databases, this setting is only used
|                  as a backup if your server is running PHP < 5.2.3 or MySQL < 5.0.7
|                 (and in table creation queries made with DB Forge).
|                  There is an incompatibility in PHP with mysql_real_escape_string() which
|                  can make your site vulnerable to SQL injection if you are using a
|                  multi-byte character set and are running versions lower than these.
|                  Sites using Latin-1 or UTF-8 database character set and collation are unaffected.
|    ['swap_pre'] A default table prefix that should be swapped with the dbprefix
|    ['encrypt']  Whether or not to use an encrypted connection.
|            'mysql' (deprecated), 'sqlsrv' and 'pdo/sqlsrv' drivers accept TRUE/FALSE
|            'mysqli' and 'pdo/mysql' drivers accept an array with the following options:
|                'ssl_key'    - Path to the private key file
|                'ssl_cert'   - Path to the public key certificate file
|                'ssl_ca'     - Path to the certificate authority file
|                'ssl_capath' - Path to a directory containing trusted CA certificates in PEM format
|                'ssl_cipher' - List of *allowed* ciphers to be used for the encryption, separated by colons (':')
|                'ssl_verify' - TRUE/FALSE; Whether verify the server certificate or not ('mysqli' only)
|    ['compress'] Whether or not to use client compression (MySQL only)
|    ['stricton'] TRUE/FALSE - forces 'Strict Mode' connections
|                            - good for ensuring strict SQL while developing
|    ['ssl_options']    Used to set various SSL options that can be used when making SSL connections.
|    ['failover'] array - A array with 0 or more data for connections if the main should fail.
|    ['save_queries'] TRUE/FALSE - Whether to "save" all executed queries.
|                 NOTE: Disabling this will also effectively disable both
|                 $this->db->last_query() and profiling of DB queries.
|                 When you run a query, with this setting set to TRUE (default),
|                 CodeIgniter will store the SQL statement for debugging purposes.
|                 However, this may cause high memory usage, especially if you run
|                 a lot of SQL queries ... disable this to avoid that problem.
| The $active_group variable lets you choose which connection group to
| make active.  By default there is only one group (the 'default' group).
| The $query_builder variables lets you determine whether or not to load
| the query builder class.
$active_group  'oracle';
$query_builder true;

$db['default'] = array(
'dsn'          => '',
'hostname'     => 'localhost',
'username'     => '',
'password'     => '',
'database'     => '',
'dbdriver'     => 'mysqli',
'dbprefix'     => '',
'pconnect'     => false,
'db_debug'     => (ENVIRONMENT !== 'production'),
'cache_on'     => false,
'cachedir'     => '',
'char_set'     => 'utf8',
'dbcollat'     => 'utf8_general_ci',
'swap_pre'     => '',
'encrypt'      => false,
'compress'     => false,
'stricton'     => false,
'failover'     => array(),
'save_queries' => true

$dbhost       ""//host
$dbport       "1521"//port default is 1521
$dbname       "orclpdb"//name of database
$dbuser       "hr"//db user with all priviliges
$dbpassword   "hr"// password of user
$dbConnString "(DESCRIPTION =(ADDRESS_LIST =(ADDRESS = (PROTOCOL = TCP)(HOST = " $dbhost ")(PORT = " $dbport "))
$dbname ")))"// connection string for this we must create TNS entry for Oracle

$db['oracle'] = array(
'dsn'          => '',
'hostname'     => $dbConnString,
'username'     => $dbuser,
'password'     => $dbpassword,
'database'     => '',
'dbdriver'     => 'oci8',
'dbprefix'     => '',
'pconnect'     => false,
'db_debug'     => (ENVIRONMENT !== 'production'),
'cache_on'     => false,
'cachedir'     => '',
'char_set'     => 'utf8',
'dbcollat'     => 'utf8_general_ci',
'swap_pre'     => '',
'encrypt'      => false,
'compress'     => false,
'stricton'     => false,
'failover'     => array(),
'save_queries' => true

Let me know if that works, that's how it should be written.
What did you Try? What did you Get? What did you Expect?

Joined CodeIgniter Community 2009.  ( Skype: insitfx )

thanks a lot @insiteFX for your help, appreciate your passion Smile. I copy/pasted your provided entries, saved and run but it is showing as below:  ( this message: table or view does not exist  i think it is connecting to database with given credentials but for some reason failed find the table 'departments' i am using in model ), even I stop WAMP after modifying database.php and start it again but didn't worked.

A PHP Error was encountered

Severity: Warning

Message: oci_execute(): ORA-00942: table or view does not exist

Filename: oci8/oci8_driver.php

Line Number: 286


File: C:\wamp64\www\myproject\application\models\Dept_model.php
Line: 15
Function: get

File: C:\wamp64\www\myproject\application\controllers\Depts.php
Line: 8
Function: getDept

File: C:\wamp64\www\myproject\index.php
Line: 315
Function: require_once

A Database Error Occurred

Error Number: 942

ORA-00942: table or view does not exist

SELECT * FROM "departments"

Filename: C:/wamp64/www/myproject/system/database/DB_driver.php

Line Number: 691

is there anything special i have to take care... like installation or copy some file like any .dll etc. for oci8 ? as mentioned earlier I have installed database 12c Release 2 and off course the same machine not need to install any oracle client.


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