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jfr.im git - z_archive/KronOS.git/blob - video/system/database/drivers/odbc/odbc_driver.php
bcd7937d9eeeb51eefd3fce2e5d82ecaffb72f64
1 <?php
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5 * An open source application development framework for PHP 5.1.6 or newer
8 * @author ExpressionEngine Dev Team
9 * @copyright Copyright (c) 2008 - 2011, EllisLab, Inc.
10 * @license http://codeigniter.com/user_guide/license.html
11 * @link http://codeigniter.com
16 // ------------------------------------------------------------------------
19 * ODBC Database Adapter Class
21 * Note: _DB is an extender class that the app controller
22 * creates dynamically based on whether the active record
23 * class is being used or not.
25 * @package CodeIgniter
28 * @author ExpressionEngine Dev Team
29 * @link http://codeigniter.com/user_guide/database/
31 class CI_DB_odbc_driver
extends CI_DB
{
33 var $dbdriver = 'odbc';
35 // the character used to excape - not necessary for ODBC
36 var $_escape_char = '';
38 // clause and character used for LIKE escape sequences
39 var $_like_escape_str = " {escape '%s'} ";
40 var $_like_escape_chr = '!';
43 * The syntax to count rows is slightly different across different
44 * database engines, so this string appears in each driver and is
45 * used for the count_all() and count_all_results() functions.
47 var $_count_string = "SELECT COUNT(*) AS ";
51 function __construct($params)
53 parent
::__construct($params);
55 $this->_random_keyword
= ' RND('.time().')'; // database specific random keyword
59 * Non-persistent database connection
61 * @access private called by the base class
66 return @odbc_connect($this->hostname
, $this->username
, $this->password
);
69 // --------------------------------------------------------------------
72 * Persistent database connection
74 * @access private called by the base class
77 function db_pconnect()
79 return @odbc_pconnect($this->hostname
, $this->username
, $this->password
);
82 // --------------------------------------------------------------------
87 * Keep / reestablish the db connection if no queries have been
88 * sent for a length of time exceeding the server's idle timeout
95 // not implemented in odbc
98 // --------------------------------------------------------------------
101 * Select the database
103 * @access private called by the base class
108 // Not needed for ODBC
112 // --------------------------------------------------------------------
115 * Set client character set
122 function db_set_charset($charset, $collation)
124 // @todo - add support if needed
128 // --------------------------------------------------------------------
131 * Version number query string
138 return "SELECT version() AS ver";
141 // --------------------------------------------------------------------
146 * @access private called by the base class
147 * @param string an SQL query
150 function _execute($sql)
152 $sql = $this->_prep_query($sql);
153 return @odbc_exec($this->conn_id
, $sql);
156 // --------------------------------------------------------------------
161 * If needed, each database adapter can prep the query string
163 * @access private called by execute()
164 * @param string an SQL query
167 function _prep_query($sql)
172 // --------------------------------------------------------------------
180 function trans_begin($test_mode = FALSE)
182 if ( ! $this->trans_enabled
)
187 // When transactions are nested we only begin/commit/rollback the outermost ones
188 if ($this->_trans_depth
> 0)
193 // Reset the transaction failure flag.
194 // If the $test_mode flag is set to TRUE transactions will be rolled back
195 // even if the queries produce a successful result.
196 $this->_trans_failure
= ($test_mode === TRUE) ? TRUE : FALSE;
198 return odbc_autocommit($this->conn_id
, FALSE);
201 // --------------------------------------------------------------------
209 function trans_commit()
211 if ( ! $this->trans_enabled
)
216 // When transactions are nested we only begin/commit/rollback the outermost ones
217 if ($this->_trans_depth
> 0)
222 $ret = odbc_commit($this->conn_id
);
223 odbc_autocommit($this->conn_id
, TRUE);
227 // --------------------------------------------------------------------
230 * Rollback Transaction
235 function trans_rollback()
237 if ( ! $this->trans_enabled
)
242 // When transactions are nested we only begin/commit/rollback the outermost ones
243 if ($this->_trans_depth
> 0)
248 $ret = odbc_rollback($this->conn_id
);
249 odbc_autocommit($this->conn_id
, TRUE);
253 // --------------------------------------------------------------------
260 * @param bool whether or not the string will be used in a LIKE condition
263 function escape_str($str, $like = FALSE)
267 foreach ($str as $key => $val)
269 $str[$key] = $this->escape_str($val, $like);
275 // ODBC doesn't require escaping
276 $str = remove_invisible_characters($str);
278 // escape LIKE condition wildcards
281 $str = str_replace( array('%', '_', $this->_like_escape_chr
),
282 array($this->_like_escape_chr
.'%', $this->_like_escape_chr
.'_', $this->_like_escape_chr
.$this->_like_escape_chr
),
289 // --------------------------------------------------------------------
297 function affected_rows()
299 return @odbc_num_rows($this->conn_id
);
302 // --------------------------------------------------------------------
312 return @odbc_insert_id($this->conn_id
);
315 // --------------------------------------------------------------------
320 * Generates a platform-specific query string that counts all records in
321 * the specified database
327 function count_all($table = '')
334 $query = $this->query($this->_count_string
. $this->_protect_identifiers('numrows') . " FROM " . $this->_protect_identifiers($table, TRUE, NULL, FALSE));
336 if ($query->num_rows() == 0)
341 $row = $query->row();
342 $this->_reset_select();
343 return (int) $row->numrows
;
346 // --------------------------------------------------------------------
351 * Generates a platform-specific query string so that the table names can be fetched
357 function _list_tables($prefix_limit = FALSE)
359 $sql = "SHOW TABLES FROM `".$this->database
."`";
361 if ($prefix_limit !== FALSE AND $this->dbprefix
!= '')
363 //$sql .= " LIKE '".$this->escape_like_str($this->dbprefix)."%' ".sprintf($this->_like_escape_str, $this->_like_escape_chr);
364 return FALSE; // not currently supported
370 // --------------------------------------------------------------------
375 * Generates a platform-specific query string so that the column names can be fetched
378 * @param string the table name
381 function _list_columns($table = '')
383 return "SHOW COLUMNS FROM ".$table;
386 // --------------------------------------------------------------------
391 * Generates a platform-specific query so that the column data can be retrieved
394 * @param string the table name
397 function _field_data($table)
399 return "SELECT TOP 1 FROM ".$table;
402 // --------------------------------------------------------------------
405 * The error message string
410 function _error_message()
412 return odbc_errormsg($this->conn_id
);
415 // --------------------------------------------------------------------
418 * The error message number
423 function _error_number()
425 return odbc_error($this->conn_id
);
428 // --------------------------------------------------------------------
431 * Escape the SQL Identifiers
433 * This function escapes column and table names
439 function _escape_identifiers($item)
441 if ($this->_escape_char
== '')
446 foreach ($this->_reserved_identifiers
as $id)
448 if (strpos($item, '.'.$id) !== FALSE)
450 $str = $this->_escape_char
. str_replace('.', $this->_escape_char
.'.', $item);
452 // remove duplicates if the user already included the escape
453 return preg_replace('/['.$this->_escape_char
.']+/', $this->_escape_char
, $str);
457 if (strpos($item, '.') !== FALSE)
459 $str = $this->_escape_char
.str_replace('.', $this->_escape_char
.'.'.$this->_escape_char
, $item).$this->_escape_char
;
463 $str = $this->_escape_char
.$item.$this->_escape_char
;
466 // remove duplicates if the user already included the escape
467 return preg_replace('/['.$this->_escape_char
.']+/', $this->_escape_char
, $str);
470 // --------------------------------------------------------------------
475 * This function implicitly groups FROM tables so there is no confusion
476 * about operator precedence in harmony with SQL standards
482 function _from_tables($tables)
484 if ( ! is_array($tables))
486 $tables = array($tables);
489 return '('.implode(', ', $tables).')';
492 // --------------------------------------------------------------------
497 * Generates a platform-specific insert string from the supplied data
500 * @param string the table name
501 * @param array the insert keys
502 * @param array the insert values
505 function _insert($table, $keys, $values)
507 return "INSERT INTO ".$table." (".implode(', ', $keys).") VALUES (".implode(', ', $values).")";
510 // --------------------------------------------------------------------
515 * Generates a platform-specific update string from the supplied data
518 * @param string the table name
519 * @param array the update data
520 * @param array the where clause
521 * @param array the orderby clause
522 * @param array the limit clause
525 function _update($table, $values, $where, $orderby = array(), $limit = FALSE)
527 foreach ($values as $key => $val)
529 $valstr[] = $key." = ".$val;
532 $limit = ( ! $limit) ? '' : ' LIMIT '.$limit;
534 $orderby = (count($orderby) >= 1)?' ORDER BY '.implode(", ", $orderby):'';
536 $sql = "UPDATE ".$table." SET ".implode(', ', $valstr);
538 $sql .= ($where != '' AND count($where) >=1) ? " WHERE ".implode(" ", $where) : '';
540 $sql .= $orderby.$limit;
546 // --------------------------------------------------------------------
551 * Generates a platform-specific truncate string from the supplied data
552 * If the database does not support the truncate() command
553 * This function maps to "DELETE FROM table"
556 * @param string the table name
559 function _truncate($table)
561 return $this->_delete($table);
564 // --------------------------------------------------------------------
569 * Generates a platform-specific delete string from the supplied data
572 * @param string the table name
573 * @param array the where clause
574 * @param string the limit clause
577 function _delete($table, $where = array(), $like = array(), $limit = FALSE)
581 if (count($where) > 0 OR count($like) > 0)
583 $conditions = "\nWHERE ";
584 $conditions .= implode("\n", $this->ar_where
);
586 if (count($where) > 0 && count($like) > 0)
588 $conditions .= " AND ";
590 $conditions .= implode("\n", $like);
593 $limit = ( ! $limit) ? '' : ' LIMIT '.$limit;
595 return "DELETE FROM ".$table.$conditions.$limit;
598 // --------------------------------------------------------------------
603 * Generates a platform-specific LIMIT clause
606 * @param string the sql query string
607 * @param integer the number of rows to limit the query to
608 * @param integer the offset value
611 function _limit($sql, $limit, $offset)
613 // Does ODBC doesn't use the LIMIT clause?
617 // --------------------------------------------------------------------
620 * Close DB Connection
626 function _close($conn_id)
628 @odbc_close($conn_id);
636 /* End of file odbc_driver.php */
637 /* Location: ./system/database/drivers/odbc/odbc_driver.php */