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common.php
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<?php
/* vim: set expandtab tabstop=4 shiftwidth=4 softtabstop=4: */
/**
* Contains the DB_common base class
*
* PHP versions 4 and 5
*
* LICENSE: This source file is subject to version 3.0 of the PHP license
* that is available through the world-wide-web at the following URI:
* http://www.php.net/license/3_0.txt. If you did not receive a copy of
* the PHP License and are unable to obtain it through the web, please
* send a note to license@php.net so we can mail you a copy immediately.
*
* @category Database
* @package DB
* @author Stig Bakken <ssb@php.net>
* @author Tomas V.V. Cox <cox@idecnet.com>
* @author Daniel Convissor <danielc@php.net>
* @copyright 1997-2005 The PHP Group
* @license http://www.php.net/license/3_0.txt PHP License 3.0
* @version CVS: $Id$
* @link http://pear.php.net/package/DB
*/
/**
* Obtain the PEAR class so it can be extended from
*/
require_once 'PEAR.php';
/**
* DB_common is the base class from which each database driver class extends
*
* All common methods are declared here. If a given DBMS driver contains
* a particular method, that method will overload the one here.
*
* @category Database
* @package DB
* @author Stig Bakken <ssb@php.net>
* @author Tomas V.V. Cox <cox@idecnet.com>
* @author Daniel Convissor <danielc@php.net>
* @copyright 1997-2005 The PHP Group
* @license http://www.php.net/license/3_0.txt PHP License 3.0
* @version Release: @package_version@
* @link http://pear.php.net/package/DB
*/
class DB_common extends PEAR
{
// {{{ properties
/**
* The current default fetch mode
* @var integer
*/
var $fetchmode = DB_FETCHMODE_ORDERED;
/**
* The name of the class into which results should be fetched when
* DB_FETCHMODE_OBJECT is in effect
*
* @var string
*/
var $fetchmode_object_class = 'stdClass';
/**
* Was a connection present when the object was serialized()?
* @var bool
* @see DB_common::__sleep(), DB_common::__wake()
*/
var $was_connected = null;
/**
* The most recently executed query
* @var string
*/
var $last_query = '';
/**
* Run-time configuration options
*
* The 'optimize' option has been deprecated. Use the 'portability'
* option instead.
*
* @var array
* @see DB_common::setOption()
*/
var $options = array(
'result_buffering' => 500,
'persistent' => false,
'ssl' => false,
'debug' => 0,
'seqname_format' => '%s_seq',
'autofree' => false,
'portability' => DB_PORTABILITY_NONE,
'optimize' => 'performance', // Deprecated. Use 'portability'.
);
/**
* The parameters from the most recently executed query
* @var array
* @since Property available since Release 1.7.0
*/
var $last_parameters = array();
/**
* The elements from each prepared statement
* @var array
*/
var $prepare_tokens = array();
/**
* The data types of the various elements in each prepared statement
* @var array
*/
var $prepare_types = array();
/**
* The prepared queries
* @var array
*/
var $prepared_queries = array();
// }}}
// {{{ DB_common
/**
* This constructor calls <kbd>$this->PEAR('DB_Error')</kbd>
*
* @return void
*/
function DB_common()
{
$this->PEAR('DB_Error');
}
// }}}
// {{{ __sleep()
/**
* Automatically indicates which properties should be saved
* when PHP's serialize() function is called
*
* @return array the array of properties names that should be saved
*/
function __sleep()
{
if ($this->connection) {
// Don't disconnect(), people use serialize() for many reasons
$this->was_connected = true;
} else {
$this->was_connected = false;
}
if (isset($this->autocommit)) {
return array('autocommit',
'dbsyntax',
'dsn',
'features',
'fetchmode',
'fetchmode_object_class',
'options',
'was_connected',
);
} else {
return array('dbsyntax',
'dsn',
'features',
'fetchmode',
'fetchmode_object_class',
'options',
'was_connected',
);
}
}
// }}}
// {{{ __wakeup()
/**
* Automatically reconnects to the database when PHP's unserialize()
* function is called
*
* The reconnection attempt is only performed if the object was connected
* at the time PHP's serialize() function was run.
*
* @return void
*/
function __wakeup()
{
if ($this->was_connected) {
$this->connect($this->dsn, $this->options);
}
}
// }}}
// {{{ __toString()
/**
* Automatic string conversion for PHP 5
*
* @return string a string describing the current PEAR DB object
*
* @since Method available since Release 1.7.0
*/
function __toString()
{
$info = strtolower(get_class($this));
$info .= ': (phptype=' . $this->phptype .
', dbsyntax=' . $this->dbsyntax .
')';
if ($this->connection) {
$info .= ' [connected]';
}
return $info;
}
// }}}
// {{{ toString()
/**
* DEPRECATED: String conversion method
*
* @return string a string describing the current PEAR DB object
*
* @deprecated Method deprecated in Release 1.7.0
*/
function toString()
{
return $this->__toString();
}
// }}}
// {{{ quoteString()
/**
* DEPRECATED: Quotes a string so it can be safely used within string
* delimiters in a query
*
* @param string $string the string to be quoted
*
* @return string the quoted string
*
* @see DB_common::quoteSmart(), DB_common::escapeSimple()
* @deprecated Method deprecated some time before Release 1.2
*/
function quoteString($string)
{
$string = $this->quote($string);
if ($string{0} == "'") {
return substr($string, 1, -1);
}
return $string;
}
// }}}
// {{{ quote()
/**
* DEPRECATED: Quotes a string so it can be safely used in a query
*
* @param string $string the string to quote
*
* @return string the quoted string or the string <samp>NULL</samp>
* if the value submitted is <kbd>null</kbd>.
*
* @see DB_common::quoteSmart(), DB_common::escapeSimple()
* @deprecated Deprecated in release 1.6.0
*/
function quote($string = null)
{
return ($string === null) ? 'NULL'
: "'" . str_replace("'", "''", $string) . "'";
}
// }}}
// {{{ quoteIdentifier()
/**
* Quotes a string so it can be safely used as a table or column name
*
* Delimiting style depends on which database driver is being used.
*
* NOTE: just because you CAN use delimited identifiers doesn't mean
* you SHOULD use them. In general, they end up causing way more
* problems than they solve.
*
* Portability is broken by using the following characters inside
* delimited identifiers:
* + backtick (<kbd>`</kbd>) -- due to MySQL
* + double quote (<kbd>"</kbd>) -- due to Oracle
* + brackets (<kbd>[</kbd> or <kbd>]</kbd>) -- due to Access
*
* Delimited identifiers are known to generally work correctly under
* the following drivers:
* + mssql
* + mysql
* + mysqli
* + oci8
* + odbc(access)
* + odbc(db2)
* + pgsql
* + sqlite
* + sybase (must execute <kbd>set quoted_identifier on</kbd> sometime
* prior to use)
*
* InterBase doesn't seem to be able to use delimited identifiers
* via PHP 4. They work fine under PHP 5.
*
* @param string $str the identifier name to be quoted
*
* @return string the quoted identifier
*
* @since Method available since Release 1.6.0
*/
function quoteIdentifier($str)
{
return '"' . str_replace('"', '""', $str) . '"';
}
// }}}
// {{{ quoteSmart()
/**
* Formats input so it can be safely used in a query
*
* The output depends on the PHP data type of input and the database
* type being used.
*
* @param mixed $in the data to be formatted
*
* @return mixed the formatted data. The format depends on the input's
* PHP type:
* <ul>
* <li>
* <kbd>input</kbd> -> <samp>returns</samp>
* </li>
* <li>
* <kbd>null</kbd> -> the string <samp>NULL</samp>
* </li>
* <li>
* <kbd>integer</kbd> or <kbd>double</kbd> -> the unquoted number
* </li>
* <li>
* <kbd>bool</kbd> -> output depends on the driver in use
* Most drivers return integers: <samp>1</samp> if
* <kbd>true</kbd> or <samp>0</samp> if
* <kbd>false</kbd>.
* Some return strings: <samp>TRUE</samp> if
* <kbd>true</kbd> or <samp>FALSE</samp> if
* <kbd>false</kbd>.
* Finally one returns strings: <samp>T</samp> if
* <kbd>true</kbd> or <samp>F</samp> if
* <kbd>false</kbd>. Here is a list of each DBMS,
* the values returned and the suggested column type:
* <ul>
* <li>
* <kbd>dbase</kbd> -> <samp>T/F</samp>
* (<kbd>Logical</kbd>)
* </li>
* <li>
* <kbd>fbase</kbd> -> <samp>TRUE/FALSE</samp>
* (<kbd>BOOLEAN</kbd>)
* </li>
* <li>
* <kbd>ibase</kbd> -> <samp>1/0</samp>
* (<kbd>SMALLINT</kbd>) [1]
* </li>
* <li>
* <kbd>ifx</kbd> -> <samp>1/0</samp>
* (<kbd>SMALLINT</kbd>) [1]
* </li>
* <li>
* <kbd>msql</kbd> -> <samp>1/0</samp>
* (<kbd>INTEGER</kbd>)
* </li>
* <li>
* <kbd>mssql</kbd> -> <samp>1/0</samp>
* (<kbd>BIT</kbd>)
* </li>
* <li>
* <kbd>mysql</kbd> -> <samp>1/0</samp>
* (<kbd>TINYINT(1)</kbd>)
* </li>
* <li>
* <kbd>mysqli</kbd> -> <samp>1/0</samp>
* (<kbd>TINYINT(1)</kbd>)
* </li>
* <li>
* <kbd>oci8</kbd> -> <samp>1/0</samp>
* (<kbd>NUMBER(1)</kbd>)
* </li>
* <li>
* <kbd>odbc</kbd> -> <samp>1/0</samp>
* (<kbd>SMALLINT</kbd>) [1]
* </li>
* <li>
* <kbd>pgsql</kbd> -> <samp>TRUE/FALSE</samp>
* (<kbd>BOOLEAN</kbd>)
* </li>
* <li>
* <kbd>sqlite</kbd> -> <samp>1/0</samp>
* (<kbd>INTEGER</kbd>)
* </li>
* <li>
* <kbd>sybase</kbd> -> <samp>1/0</samp>
* (<kbd>TINYINT(1)</kbd>)
* </li>
* </ul>
* [1] Accommodate the lowest common denominator because not all
* versions of have <kbd>BOOLEAN</kbd>.
* </li>
* <li>
* other (including strings and numeric strings) ->
* the data with single quotes escaped by preceeding
* single quotes, backslashes are escaped by preceeding
* backslashes, then the whole string is encapsulated
* between single quotes
* </li>
* </ul>
*
* @see DB_common::escapeSimple()
* @since Method available since Release 1.6.0
*/
function quoteSmart($in)
{
if (is_int($in) || is_double($in)) {
return $in;
} elseif (is_bool($in)) {
return $in ? 1 : 0;
} elseif (is_null($in)) {
return 'NULL';
} else {
return "'" . $this->escapeSimple($in) . "'";
}
}
// }}}
// {{{ escapeSimple()
/**
* Escapes a string according to the current DBMS's standards
*
* In SQLite, this makes things safe for inserts/updates, but may
* cause problems when performing text comparisons against columns
* containing binary data. See the
* {@link http://php.net/sqlite_escape_string PHP manual} for more info.
*
* @param string $str the string to be escaped
*
* @return string the escaped string
*
* @see DB_common::quoteSmart()
* @since Method available since Release 1.6.0
*/
function escapeSimple($str)
{
return str_replace("'", "''", $str);
}
// }}}
// {{{ provides()
/**
* Tells whether the present driver supports a given feature
*
* @param string $feature the feature you're curious about
*
* @return bool whether this driver supports $feature
*/
function provides($feature)
{
return $this->features[$feature];
}
// }}}
// {{{ setFetchMode()
/**
* Sets the fetch mode that should be used by default for query results
*
* @param integer $fetchmode DB_FETCHMODE_ORDERED, DB_FETCHMODE_ASSOC
* or DB_FETCHMODE_OBJECT
* @param string $object_class the class name of the object to be returned
* by the fetch methods when the
* DB_FETCHMODE_OBJECT mode is selected.
* If no class is specified by default a cast
* to object from the assoc array row will be
* done. There is also the posibility to use
* and extend the 'DB_row' class.
*
* @see DB_FETCHMODE_ORDERED, DB_FETCHMODE_ASSOC, DB_FETCHMODE_OBJECT
*/
function setFetchMode($fetchmode, $object_class = 'stdClass')
{
switch ($fetchmode) {
case DB_FETCHMODE_OBJECT:
$this->fetchmode_object_class = $object_class;
case DB_FETCHMODE_ORDERED:
case DB_FETCHMODE_ASSOC:
$this->fetchmode = $fetchmode;
break;
default:
return $this->raiseError('invalid fetchmode mode');
}
}
// }}}
// {{{ setOption()
/**
* Sets run-time configuration options for PEAR DB
*
* Options, their data types, default values and description:
* <ul>
* <li>
* <var>autofree</var> <kbd>boolean</kbd> = <samp>false</samp>
* <br />should results be freed automatically when there are no
* more rows?
* </li><li>
* <var>result_buffering</var> <kbd>integer</kbd> = <samp>500</samp>
* <br />how many rows of the result set should be buffered?
* <br />In mysql: mysql_unbuffered_query() is used instead of
* mysql_query() if this value is 0. (Release 1.7.0)
* <br />In oci8: this value is passed to ocisetprefetch().
* (Release 1.7.0)
* </li><li>
* <var>debug</var> <kbd>integer</kbd> = <samp>0</samp>
* <br />debug level
* </li><li>
* <var>persistent</var> <kbd>boolean</kbd> = <samp>false</samp>
* <br />should the connection be persistent?
* </li><li>
* <var>portability</var> <kbd>integer</kbd> = <samp>DB_PORTABILITY_NONE</samp>
* <br />portability mode constant (see below)
* </li><li>
* <var>seqname_format</var> <kbd>string</kbd> = <samp>%s_seq</samp>
* <br />the sprintf() format string used on sequence names. This
* format is applied to sequence names passed to
* createSequence(), nextID() and dropSequence().
* </li><li>
* <var>ssl</var> <kbd>boolean</kbd> = <samp>false</samp>
* <br />use ssl to connect?
* </li>
* </ul>
*
* -----------------------------------------
*
* PORTABILITY MODES
*
* These modes are bitwised, so they can be combined using <kbd>|</kbd>
* and removed using <kbd>^</kbd>. See the examples section below on how
* to do this.
*
* <samp>DB_PORTABILITY_NONE</samp>
* turn off all portability features
*
* This mode gets automatically turned on if the deprecated
* <var>optimize</var> option gets set to <samp>performance</samp>.
*
*
* <samp>DB_PORTABILITY_LOWERCASE</samp>
* convert names of tables and fields to lower case when using
* <kbd>get*()</kbd>, <kbd>fetch*()</kbd> and <kbd>tableInfo()</kbd>
*
* This mode gets automatically turned on in the following databases
* if the deprecated option <var>optimize</var> gets set to
* <samp>portability</samp>:
* + oci8
*
*
* <samp>DB_PORTABILITY_RTRIM</samp>
* right trim the data output by <kbd>get*()</kbd> <kbd>fetch*()</kbd>
*
*
* <samp>DB_PORTABILITY_DELETE_COUNT</samp>
* force reporting the number of rows deleted
*
* Some DBMS's don't count the number of rows deleted when performing
* simple <kbd>DELETE FROM tablename</kbd> queries. This portability
* mode tricks such DBMS's into telling the count by adding
* <samp>WHERE 1=1</samp> to the end of <kbd>DELETE</kbd> queries.
*
* This mode gets automatically turned on in the following databases
* if the deprecated option <var>optimize</var> gets set to
* <samp>portability</samp>:
* + fbsql
* + mysql
* + mysqli
* + sqlite
*
*
* <samp>DB_PORTABILITY_NUMROWS</samp>
* enable hack that makes <kbd>numRows()</kbd> work in Oracle
*
* This mode gets automatically turned on in the following databases
* if the deprecated option <var>optimize</var> gets set to
* <samp>portability</samp>:
* + oci8
*
*
* <samp>DB_PORTABILITY_ERRORS</samp>
* makes certain error messages in certain drivers compatible
* with those from other DBMS's
*
* + mysql, mysqli: change unique/primary key constraints
* DB_ERROR_ALREADY_EXISTS -> DB_ERROR_CONSTRAINT
*
* + odbc(access): MS's ODBC driver reports 'no such field' as code
* 07001, which means 'too few parameters.' When this option is on
* that code gets mapped to DB_ERROR_NOSUCHFIELD.
* DB_ERROR_MISMATCH -> DB_ERROR_NOSUCHFIELD
*
* <samp>DB_PORTABILITY_NULL_TO_EMPTY</samp>
* convert null values to empty strings in data output by get*() and
* fetch*(). Needed because Oracle considers empty strings to be null,
* while most other DBMS's know the difference between empty and null.
*
*
* <samp>DB_PORTABILITY_ALL</samp>
* turn on all portability features
*
* -----------------------------------------
*
* Example 1. Simple setOption() example
* <code>
* $db->setOption('autofree', true);
* </code>
*
* Example 2. Portability for lowercasing and trimming
* <code>
* $db->setOption('portability',
* DB_PORTABILITY_LOWERCASE | DB_PORTABILITY_RTRIM);
* </code>
*
* Example 3. All portability options except trimming
* <code>
* $db->setOption('portability',
* DB_PORTABILITY_ALL ^ DB_PORTABILITY_RTRIM);
* </code>
*
* @param string $option option name
* @param mixed $value value for the option
*
* @return int DB_OK on success. A DB_Error object on failure.
*
* @see DB_common::$options
*/
function setOption($option, $value)
{
if (isset($this->options[$option])) {
$this->options[$option] = $value;
/*
* Backwards compatibility check for the deprecated 'optimize'
* option. Done here in case settings change after connecting.
*/
if ($option == 'optimize') {
if ($value == 'portability') {
switch ($this->phptype) {
case 'oci8':
$this->options['portability'] =
DB_PORTABILITY_LOWERCASE |
DB_PORTABILITY_NUMROWS;
break;
case 'fbsql':
case 'mysql':
case 'mysqli':
case 'sqlite':
$this->options['portability'] =
DB_PORTABILITY_DELETE_COUNT;
break;
}
} else {
$this->options['portability'] = DB_PORTABILITY_NONE;
}
}
return DB_OK;
}
return $this->raiseError("unknown option $option");
}
// }}}
// {{{ getOption()
/**
* Returns the value of an option
*
* @param string $option the option name you're curious about
*
* @return mixed the option's value
*/
function getOption($option)
{
if (isset($this->options[$option])) {
return $this->options[$option];
}
return $this->raiseError("unknown option $option");
}
// }}}
// {{{ prepare()
/**
* Prepares a query for multiple execution with execute()
*
* Creates a query that can be run multiple times. Each time it is run,
* the placeholders, if any, will be replaced by the contents of
* execute()'s $data argument.
*
* Three types of placeholders can be used:
* + <kbd>?</kbd> scalar value (i.e. strings, integers). The system
* will automatically quote and escape the data.
* + <kbd>!</kbd> value is inserted 'as is'
* + <kbd>&</kbd> requires a file name. The file's contents get
* inserted into the query (i.e. saving binary
* data in a db)
*
* Example 1.
* <code>
* $sth = $db->prepare('INSERT INTO tbl (a, b, c) VALUES (?, !, &)');
* $data = array(
* "John's text",
* "'it''s good'",
* 'filename.txt'
* );
* $res = $db->execute($sth, $data);
* </code>
*
* Use backslashes to escape placeholder characters if you don't want
* them to be interpreted as placeholders:
* <pre>
* "UPDATE foo SET col=? WHERE col='over \& under'"
* </pre>
*
* With some database backends, this is emulated.
*
* {@internal ibase and oci8 have their own prepare() methods.}}
*
* @param string $query the query to be prepared
*
* @return mixed DB statement resource on success. A DB_Error object
* on failure.
*
* @see DB_common::execute()
*/
function prepare($query)
{
$tokens = preg_split('/((?<!\\\)[&?!])/', $query, -1,
PREG_SPLIT_DELIM_CAPTURE);
$token = 0;
$types = array();
$newtokens = array();
foreach ($tokens as $val) {
switch ($val) {
case '?':
$types[$token++] = DB_PARAM_SCALAR;
break;
case '&':
$types[$token++] = DB_PARAM_OPAQUE;
break;
case '!':
$types[$token++] = DB_PARAM_MISC;
break;
default:
$newtokens[] = preg_replace('/\\\([&?!])/', "\\1", $val);
}
}
$this->prepare_tokens[] = &$newtokens;
end($this->prepare_tokens);
$k = key($this->prepare_tokens);
$this->prepare_types[$k] = $types;
$this->prepared_queries[$k] = implode(' ', $newtokens);
return $k;
}
// }}}
// {{{ autoPrepare()
/**
* Automaticaly generates an insert or update query and pass it to prepare()
*
* @param string $table the table name
* @param array $table_fields the array of field names
* @param int $mode a type of query to make:
* DB_AUTOQUERY_INSERT or DB_AUTOQUERY_UPDATE
* @param string $where for update queries: the WHERE clause to
* append to the SQL statement. Don't
* include the "WHERE" keyword.
*
* @return resource the query handle
*
* @uses DB_common::prepare(), DB_common::buildManipSQL()
*/
function autoPrepare($table, $table_fields, $mode = DB_AUTOQUERY_INSERT,
$where = false)
{
$query = $this->buildManipSQL($table, $table_fields, $mode, $where);
if (DB::isError($query)) {
return $query;
}
return $this->prepare($query);
}
// }}}
// {{{ autoExecute()
/**
* Automaticaly generates an insert or update query and call prepare()
* and execute() with it
*
* @param string $table the table name
* @param array $fields_values the associative array where $key is a
* field name and $value its value
* @param int $mode a type of query to make:
* DB_AUTOQUERY_INSERT or DB_AUTOQUERY_UPDATE
* @param string $where for update queries: the WHERE clause to
* append to the SQL statement. Don't
* include the "WHERE" keyword.
*
* @return mixed a new DB_result object for successful SELECT queries
* or DB_OK for successul data manipulation queries.
* A DB_Error object on failure.
*
* @uses DB_common::autoPrepare(), DB_common::execute()
*/
function autoExecute($table, $fields_values, $mode = DB_AUTOQUERY_INSERT,
$where = false)
{
$sth = $this->autoPrepare($table, array_keys($fields_values), $mode,
$where);
if (DB::isError($sth)) {
return $sth;
}
$ret =& $this->execute($sth, array_values($fields_values));
$this->freePrepared($sth);
return $ret;
}
// }}}
// {{{ buildManipSQL()
/**
* Produces an SQL query string for autoPrepare()
*
* Example:
* <pre>
* buildManipSQL('table_sql', array('field1', 'field2', 'field3'),
* DB_AUTOQUERY_INSERT);
* </pre>
*
* That returns
* <samp>
* INSERT INTO table_sql (field1,field2,field3) VALUES (?,?,?)
* </samp>
*
* NOTES:
* - This belongs more to a SQL Builder class, but this is a simple
* facility.
* - Be carefull! If you don't give a $where param with an UPDATE
* query, all the records of the table will be updated!
*
* @param string $table the table name
* @param array $table_fields the array of field names
* @param int $mode a type of query to make:
* DB_AUTOQUERY_INSERT or DB_AUTOQUERY_UPDATE
* @param string $where for update queries: the WHERE clause to
* append to the SQL statement. Don't
* include the "WHERE" keyword.
*
* @return string the sql query for autoPrepare()
*/
function buildManipSQL($table, $table_fields, $mode, $where = false)
{
if (count($table_fields) == 0) {
return $this->raiseError(DB_ERROR_NEED_MORE_DATA);
}
$first = true;
switch ($mode) {
case DB_AUTOQUERY_INSERT:
$values = '';
$names = '';
foreach ($table_fields as $value) {
if ($first) {
$first = false;
} else {
$names .= ',';
$values .= ',';
}
$names .= $value;
$values .= '?';
}
return "INSERT INTO $table ($names) VALUES ($values)";
case DB_AUTOQUERY_UPDATE:
$set = '';
foreach ($table_fields as $value) {
if ($first) {
$first = false;
} else {
$set .= ',';
}
$set .= "$value = ?";
}
$sql = "UPDATE $table SET $set";
if ($where) {
$sql .= " WHERE $where";
}
return $sql;
default:
return $this->raiseError(DB_ERROR_SYNTAX);
}
}
// }}}
// {{{ execute()
/**
* Executes a DB statement prepared with prepare()
*
* Example 1.
* <code>
* $sth = $db->prepare('INSERT INTO tbl (a, b, c) VALUES (?, !, &)');
* $data = array(
* "John's text",
* "'it''s good'",
* 'filename.txt'
* );
* $res =& $db->execute($sth, $data);
* </code>
*
* @param resource $stmt a DB statement resource returned from prepare()
* @param mixed $data array, string or numeric data to be used in
* execution of the statement. Quantity of items
* passed must match quantity of placeholders in
* query: meaning 1 placeholder for non-array
* parameters or 1 placeholder per array element.
*
* @return mixed a new DB_result object for successful SELECT queries
* or DB_OK for successul data manipulation queries.
* A DB_Error object on failure.
*
* {@internal ibase and oci8 have their own execute() methods.}}
*
* @see DB_common::prepare()
*/
function &execute($stmt, $data = array())
{
$realquery = $this->executeEmulateQuery($stmt, $data);
if (DB::isError($realquery)) {
return $realquery;
}
$result = $this->simpleQuery($realquery);
if ($result === DB_OK || DB::isError($result)) {
return $result;
} else {
$tmp =& new DB_result($this, $result);
return $tmp;
}
}
// }}}
// {{{ executeEmulateQuery()
/**
* Emulates executing prepared statements if the DBMS not support them
*
* @param resource $stmt a DB statement resource returned from execute()
* @param mixed $data array, string or numeric data to be used in
* execution of the statement. Quantity of items
* passed must match quantity of placeholders in
* query: meaning 1 placeholder for non-array
* parameters or 1 placeholder per array element.
*
* @return mixed a string containing the real query run when emulating
* prepare/execute. A DB_Error object on failure.
*
* @access protected
* @see DB_common::execute()
*/
function executeEmulateQuery($stmt, $data = array())
{
$stmt = (int)$stmt;
$data = (array)$data;
$this->last_parameters = $data;
if (count($this->prepare_types[$stmt]) != count($data)) {
$this->last_query = $this->prepared_queries[$stmt];
return $this->raiseError(DB_ERROR_MISMATCH);
}
$realquery = $this->prepare_tokens[$stmt][0];
$i = 0;
foreach ($data as $value) {
if ($this->prepare_types[$stmt][$i] == DB_PARAM_SCALAR) {
$realquery .= $this->quoteSmart($value);
} elseif ($this->prepare_types[$stmt][$i] == DB_PARAM_OPAQUE) {
$fp = @fopen($value, 'rb');
if (!$fp) {
return $this->raiseError(DB_ERROR_ACCESS_VIOLATION);
}
$realquery .= $this->quoteSmart(fread($fp, filesize($value)));
fclose($fp);
} else {
$realquery .= $value;
}
$realquery .= $this->prepare_tokens[$stmt][++$i];
}
return $realquery;
}
// }}}
// {{{ executeMultiple()
/**
* Performs several execute() calls on the same statement handle
*
* $data must be an array indexed numerically
* from 0, one execute call is done for every "row" in the array.
*
* If an error occurs during execute(), executeMultiple() does not
* execute the unfinished rows, but rather returns that error.
*
* @param resource $stmt query handle from prepare()
* @param array $data numeric array containing the
* data to insert into the query
*
* @return int DB_OK on success. A DB_Error object on failure.
*
* @see DB_common::prepare(), DB_common::execute()
*/
function executeMultiple($stmt, $data)
{
foreach ($data as $value) {
$res =& $this->execute($stmt, $value);
if (DB::isError($res)) {
return $res;
}
}
return DB_OK;
}
// }}}
// {{{ freePrepared()
/**
* Frees the internal resources associated with a prepared query
*
* @param resource $stmt the prepared statement's PHP resource
* @param bool $free_resource should the PHP resource be freed too?
* Use false if you need to get data
* from the result set later.
*
* @return bool TRUE on success, FALSE if $result is invalid
*
* @see DB_common::prepare()
*/
function freePrepared($stmt, $free_resource = true)
{
$stmt = (int)$stmt;
if (isset($this->prepare_tokens[$stmt])) {
unset($this->prepare_tokens[$stmt]);
unset($this->prepare_types[$stmt]);
unset($this->prepared_queries[$stmt]);
return true;
}
return false;
}
// }}}
// {{{ modifyQuery()
/**
* Changes a query string for various DBMS specific reasons
*
* It is defined here to ensure all drivers have this method available.
*
* @param string $query the query string to modify
*
* @return string the modified query string
*
* @access protected
* @see DB_mysql::modifyQuery(), DB_oci8::modifyQuery(),
* DB_sqlite::modifyQuery()
*/
function modifyQuery($query)
{
return $query;
}
// }}}
// {{{ modifyLimitQuery()
/**
* Adds LIMIT clauses to a query string according to current DBMS standards
*
* It is defined here to assure that all implementations
* have this method defined.
*
* @param string $query the query to modify
* @param int $from the row to start to fetching (0 = the first row)
* @param int $count the numbers of rows to fetch
* @param mixed $params array, string or numeric data to be used in
* execution of the statement. Quantity of items
* passed must match quantity of placeholders in
* query: meaning 1 placeholder for non-array
* parameters or 1 placeholder per array element.
*
* @return string the query string with LIMIT clauses added
*
* @access protected
*/
function modifyLimitQuery($query, $from, $count, $params = array())
{
return $query;
}
// }}}
// {{{ query()
/**
* Sends a query to the database server
*
* The query string can be either a normal statement to be sent directly
* to the server OR if <var>$params</var> are passed the query can have
* placeholders and it will be passed through prepare() and execute().
*
* @param string $query the SQL query or the statement to prepare
* @param mixed $params array, string or numeric data to be used in
* execution of the statement. Quantity of items
* passed must match quantity of placeholders in
* query: meaning 1 placeholder for non-array
* parameters or 1 placeholder per array element.
*
* @return mixed a new DB_result object for successful SELECT queries
* or DB_OK for successul data manipulation queries.
* A DB_Error object on failure.
*
* @see DB_result, DB_common::prepare(), DB_common::execute()
*/
function &query($query, $params = array())
{
if (sizeof($params) > 0) {
$sth = $this->prepare($query);
if (DB::isError($sth)) {
return $sth;
}
$ret =& $this->execute($sth, $params);
$this->freePrepared($sth, false);
return $ret;
} else {
$this->last_parameters = array();
$result = $this->simpleQuery($query);
if ($result === DB_OK || DB::isError($result)) {
return $result;
} else {
$tmp =& new DB_result($this, $result);
return $tmp;
}
}
}
// }}}
// {{{ limitQuery()
/**
* Generates and executes a LIMIT query
*
* @param string $query the query
* @param intr $from the row to start to fetching (0 = the first row)
* @param int $count the numbers of rows to fetch
* @param mixed $params array, string or numeric data to be used in
* execution of the statement. Quantity of items
* passed must match quantity of placeholders in
* query: meaning 1 placeholder for non-array
* parameters or 1 placeholder per array element.
*
* @return mixed a new DB_result object for successful SELECT queries
* or DB_OK for successul data manipulation queries.
* A DB_Error object on failure.
*/
function &limitQuery($query, $from, $count, $params = array())
{
$query = $this->modifyLimitQuery($query, $from, $count, $params);
if (DB::isError($query)){
return $query;
}
$result =& $this->query($query, $params);
if (is_a($result, 'DB_result')) {
$result->setOption('limit_from', $from);
$result->setOption('limit_count', $count);
}
return $result;
}
// }}}
// {{{ getOne()
/**
* Fetches the first column of the first row from a query result
*
* Takes care of doing the query and freeing the results when finished.
*
* @param string $query the SQL query
* @param mixed $params array, string or numeric data to be used in
* execution of the statement. Quantity of items
* passed must match quantity of placeholders in
* query: meaning 1 placeholder for non-array
* parameters or 1 placeholder per array element.
*
* @return mixed the returned value of the query.
* A DB_Error object on failure.
*/
function &getOne($query, $params = array())
{
$params = (array)$params;
// modifyLimitQuery() would be nice here, but it causes BC issues
if (sizeof($params) > 0) {
$sth = $this->prepare($query);
if (DB::isError($sth)) {
return $sth;
}
$res =& $this->execute($sth, $params);
$this->freePrepared($sth);
} else {
$res =& $this->query($query);
}
if (DB::isError($res)) {
return $res;
}
$err = $res->fetchInto($row, DB_FETCHMODE_ORDERED);
$res->free();
if ($err !== DB_OK) {
return $err;
}
return $row[0];
}
// }}}
// {{{ getRow()
/**
* Fetches the first row of data returned from a query result
*
* Takes care of doing the query and freeing the results when finished.
*
* @param string $query the SQL query
* @param mixed $params array, string or numeric data to be used in
* execution of the statement. Quantity of items
* passed must match quantity of placeholders in
* query: meaning 1 placeholder for non-array
* parameters or 1 placeholder per array element.
* @param int $fetchmode the fetch mode to use
*
* @return array the first row of results as an array.
* A DB_Error object on failure.
*/
function &getRow($query, $params = array(),
$fetchmode = DB_FETCHMODE_DEFAULT)
{
// compat check, the params and fetchmode parameters used to
// have the opposite order
if (!is_array($params)) {
if (is_array($fetchmode)) {
if ($params === null) {
$tmp = DB_FETCHMODE_DEFAULT;
} else {
$tmp = $params;
}
$params = $fetchmode;
$fetchmode = $tmp;
} elseif ($params !== null) {
$fetchmode = $params;
$params = array();
}
}
// modifyLimitQuery() would be nice here, but it causes BC issues
if (sizeof($params) > 0) {
$sth = $this->prepare($query);
if (DB::isError($sth)) {
return $sth;
}
$res =& $this->execute($sth, $params);
$this->freePrepared($sth);
} else {
$res =& $this->query($query);
}
if (DB::isError($res)) {
return $res;
}
$err = $res->fetchInto($row, $fetchmode);
$res->free();
if ($err !== DB_OK) {
return $err;
}
return $row;
}
// }}}
// {{{ getCol()
/**
* Fetches a single column from a query result and returns it as an
* indexed array
*
* @param string $query the SQL query
* @param mixed $col which column to return (integer [column number,
* starting at 0] or string [column name])
* @param mixed $params array, string or numeric data to be used in
* execution of the statement. Quantity of items
* passed must match quantity of placeholders in
* query: meaning 1 placeholder for non-array
* parameters or 1 placeholder per array element.
*
* @return array the results as an array. A DB_Error object on failure.
*
* @see DB_common::query()
*/
function &getCol($query, $col = 0, $params = array())
{
$params = (array)$params;
if (sizeof($params) > 0) {
$sth = $this->prepare($query);
if (DB::isError($sth)) {
return $sth;
}
$res =& $this->execute($sth, $params);
$this->freePrepared($sth);
} else {
$res =& $this->query($query);
}
if (DB::isError($res)) {
return $res;
}
$fetchmode = is_int($col) ? DB_FETCHMODE_ORDERED : DB_FETCHMODE_ASSOC;
if (!is_array($row = $res->fetchRow($fetchmode))) {
$ret = array();
} else {
if (!array_key_exists($col, $row)) {
$ret =& $this->raiseError(DB_ERROR_NOSUCHFIELD);
} else {
$ret = array($row[$col]);
while (is_array($row = $res->fetchRow($fetchmode))) {
$ret[] = $row[$col];
}
}
}
$res->free();
if (DB::isError($row)) {
$ret = $row;
}
return $ret;
}
// }}}
// {{{ getAssoc()
/**
* Fetches an entire query result and returns it as an
* associative array using the first column as the key
*
* If the result set contains more than two columns, the value
* will be an array of the values from column 2-n. If the result
* set contains only two columns, the returned value will be a
* scalar with the value of the second column (unless forced to an
* array with the $force_array parameter). A DB error code is
* returned on errors. If the result set contains fewer than two
* columns, a DB_ERROR_TRUNCATED error is returned.
*
* For example, if the table "mytable" contains:
*
* <pre>
* ID TEXT DATE
* --------------------------------
* 1 'one' 944679408
* 2 'two' 944679408
* 3 'three' 944679408
* </pre>
*
* Then the call getAssoc('SELECT id,text FROM mytable') returns:
* <pre>
* array(
* '1' => 'one',
* '2' => 'two',
* '3' => 'three',
* )
* </pre>
*
* ...while the call getAssoc('SELECT id,text,date FROM mytable') returns:
* <pre>
* array(
* '1' => array('one', '944679408'),
* '2' => array('two', '944679408'),
* '3' => array('three', '944679408')
* )
* </pre>
*
* If the more than one row occurs with the same value in the
* first column, the last row overwrites all previous ones by
* default. Use the $group parameter if you don't want to
* overwrite like this. Example:
*
* <pre>
* getAssoc('SELECT category,id,name FROM mytable', false, null,
* DB_FETCHMODE_ASSOC, true) returns:
*
* array(
* '1' => array(array('id' => '4', 'name' => 'number four'),
* array('id' => '6', 'name' => 'number six')
* ),
* '9' => array(array('id' => '4', 'name' => 'number four'),
* array('id' => '6', 'name' => 'number six')
* )
* )
* </pre>
*
* Keep in mind that database functions in PHP usually return string
* values for results regardless of the database's internal type.
*
* @param string $query the SQL query
* @param bool $force_array used only when the query returns
* exactly two columns. If true, the values
* of the returned array will be one-element
* arrays instead of scalars.
* @param mixed $params array, string or numeric data to be used in
* execution of the statement. Quantity of
* items passed must match quantity of
* placeholders in query: meaning 1
* placeholder for non-array parameters or
* 1 placeholder per array element.
* @param int $fetchmode the fetch mode to use
* @param bool $group if true, the values of the returned array
* is wrapped in another array. If the same
* key value (in the first column) repeats
* itself, the values will be appended to
* this array instead of overwriting the
* existing values.
*
* @return array the associative array containing the query results.
* A DB_Error object on failure.
*/
function &getAssoc($query, $force_array = false, $params = array(),
$fetchmode = DB_FETCHMODE_DEFAULT, $group = false)
{
$params = (array)$params;
if (sizeof($params) > 0) {
$sth = $this->prepare($query);
if (DB::isError($sth)) {
return $sth;
}
$res =& $this->execute($sth, $params);
$this->freePrepared($sth);
} else {
$res =& $this->query($query);
}
if (DB::isError($res)) {
return $res;
}
if ($fetchmode == DB_FETCHMODE_DEFAULT) {
$fetchmode = $this->fetchmode;
}
$cols = $res->numCols();
if ($cols < 2) {
$tmp =& $this->raiseError(DB_ERROR_TRUNCATED);
return $tmp;
}
$results = array();
if ($cols > 2 || $force_array) {
// return array values
// XXX this part can be optimized
if ($fetchmode == DB_FETCHMODE_ASSOC) {
while (is_array($row = $res->fetchRow(DB_FETCHMODE_ASSOC))) {
reset($row);
$key = current($row);
unset($row[key($row)]);
if ($group) {
$results[$key][] = $row;
} else {
$results[$key] = $row;
}
}
} elseif ($fetchmode == DB_FETCHMODE_OBJECT) {
while ($row = $res->fetchRow(DB_FETCHMODE_OBJECT)) {
$arr = get_object_vars($row);
$key = current($arr);
if ($group) {
$results[$key][] = $row;
} else {
$results[$key] = $row;
}
}
} else {
while (is_array($row = $res->fetchRow(DB_FETCHMODE_ORDERED))) {
// we shift away the first element to get
// indices running from 0 again
$key = array_shift($row);
if ($group) {
$results[$key][] = $row;
} else {
$results[$key] = $row;
}
}
}
if (DB::isError($row)) {
$results = $row;
}
} else {
// return scalar values
while (is_array($row = $res->fetchRow(DB_FETCHMODE_ORDERED))) {
if ($group) {
$results[$row[0]][] = $row[1];
} else {
$results[$row[0]] = $row[1];
}
}
if (DB::isError($row)) {
$results = $row;
}
}
$res->free();
return $results;
}
// }}}
// {{{ getAll()
/**
* Fetches all of the rows from a query result
*
* @param string $query the SQL query
* @param mixed $params array, string or numeric data to be used in
* execution of the statement. Quantity of
* items passed must match quantity of
* placeholders in query: meaning 1
* placeholder for non-array parameters or
* 1 placeholder per array element.
* @param int $fetchmode the fetch mode to use:
* + DB_FETCHMODE_ORDERED
* + DB_FETCHMODE_ASSOC
* + DB_FETCHMODE_ORDERED | DB_FETCHMODE_FLIPPED
* + DB_FETCHMODE_ASSOC | DB_FETCHMODE_FLIPPED
*
* @return array the nested array. A DB_Error object on failure.
*/
function &getAll($query, $params = array(),
$fetchmode = DB_FETCHMODE_DEFAULT)
{
// compat check, the params and fetchmode parameters used to
// have the opposite order
if (!is_array($params)) {
if (is_array($fetchmode)) {
if ($params === null) {
$tmp = DB_FETCHMODE_DEFAULT;
} else {
$tmp = $params;
}
$params = $fetchmode;
$fetchmode = $tmp;
} elseif ($params !== null) {
$fetchmode = $params;
$params = array();
}
}
if (sizeof($params) > 0) {
$sth = $this->prepare($query);
if (DB::isError($sth)) {
return $sth;
}
$res =& $this->execute($sth, $params);
$this->freePrepared($sth);
} else {
$res =& $this->query($query);
}
if ($res === DB_OK || DB::isError($res)) {
return $res;
}
$results = array();
while (DB_OK === $res->fetchInto($row, $fetchmode)) {
if ($fetchmode & DB_FETCHMODE_FLIPPED) {
foreach ($row as $key => $val) {
$results[$key][] = $val;
}
} else {
$results[] = $row;
}
}
$res->free();
if (DB::isError($row)) {
$tmp =& $this->raiseError($row);
return $tmp;
}
return $results;
}
// }}}
// {{{ autoCommit()
/**
* Enables or disables automatic commits
*
* @param bool $onoff true turns it on, false turns it off
*
* @return int DB_OK on success. A DB_Error object if the driver
* doesn't support auto-committing transactions.
*/
function autoCommit($onoff = false)
{
return $this->raiseError(DB_ERROR_NOT_CAPABLE);
}
// }}}
// {{{ commit()
/**
* Commits the current transaction
*
* @return int DB_OK on success. A DB_Error object on failure.
*/
function commit()
{
return $this->raiseError(DB_ERROR_NOT_CAPABLE);
}
// }}}
// {{{ rollback()
/**
* Reverts the current transaction
*
* @return int DB_OK on success. A DB_Error object on failure.
*/
function rollback()
{
return $this->raiseError(DB_ERROR_NOT_CAPABLE);
}
// }}}
// {{{ numRows()
/**
* Determines the number of rows in a query result
*
* @param resource $result the query result idenifier produced by PHP
*
* @return int the number of rows. A DB_Error object on failure.
*/
function numRows($result)
{
return $this->raiseError(DB_ERROR_NOT_CAPABLE);
}
// }}}
// {{{ affectedRows()
/**
* Determines the number of rows affected by a data maniuplation query
*
* 0 is returned for queries that don't manipulate data.
*
* @return int the number of rows. A DB_Error object on failure.
*/
function affectedRows()
{
return $this->raiseError(DB_ERROR_NOT_CAPABLE);
}
// }}}
// {{{ getSequenceName()
/**
* Generates the name used inside the database for a sequence
*
* The createSequence() docblock contains notes about storing sequence
* names.
*
* @param string $sqn the sequence's public name
*
* @return string the sequence's name in the backend
*
* @access protected
* @see DB_common::createSequence(), DB_common::dropSequence(),
* DB_common::nextID(), DB_common::setOption()
*/
function getSequenceName($sqn)
{
return sprintf($this->getOption('seqname_format'),
preg_replace('/[^a-z0-9_.]/i', '_', $sqn));
}
// }}}
// {{{ nextId()
/**
* Returns the next free id in a sequence
*
* @param string $seq_name name of the sequence
* @param boolean $ondemand when true, the seqence is automatically
* created if it does not exist
*
* @return int the next id number in the sequence.
* A DB_Error object on failure.
*
* @see DB_common::createSequence(), DB_common::dropSequence(),
* DB_common::getSequenceName()
*/
function nextId($seq_name, $ondemand = true)
{
return $this->raiseError(DB_ERROR_NOT_CAPABLE);
}
// }}}
// {{{ createSequence()
/**
* Creates a new sequence
*
* The name of a given sequence is determined by passing the string
* provided in the <var>$seq_name</var> argument through PHP's sprintf()
* function using the value from the <var>seqname_format</var> option as
* the sprintf()'s format argument.
*
* <var>seqname_format</var> is set via setOption().
*
* @param string $seq_name name of the new sequence
*
* @return int DB_OK on success. A DB_Error object on failure.
*
* @see DB_common::dropSequence(), DB_common::getSequenceName(),
* DB_common::nextID()
*/
function createSequence($seq_name)
{
return $this->raiseError(DB_ERROR_NOT_CAPABLE);
}
// }}}
// {{{ dropSequence()
/**
* Deletes a sequence
*
* @param string $seq_name name of the sequence to be deleted
*
* @return int DB_OK on success. A DB_Error object on failure.
*
* @see DB_common::createSequence(), DB_common::getSequenceName(),
* DB_common::nextID()
*/
function dropSequence($seq_name)
{
return $this->raiseError(DB_ERROR_NOT_CAPABLE);
}
// }}}
// {{{ raiseError()
/**
* Communicates an error and invoke error callbacks, etc
*
* Basically a wrapper for PEAR::raiseError without the message string.
*
* @param mixed integer error code, or a PEAR error object (all
* other parameters are ignored if this parameter is
* an object
* @param int error mode, see PEAR_Error docs
* @param mixed if error mode is PEAR_ERROR_TRIGGER, this is the
* error level (E_USER_NOTICE etc). If error mode is
* PEAR_ERROR_CALLBACK, this is the callback function,
* either as a function name, or as an array of an
* object and method name. For other error modes this
* parameter is ignored.
* @param string extra debug information. Defaults to the last
* query and native error code.
* @param mixed native error code, integer or string depending the
* backend
*
* @return object the PEAR_Error object
*
* @see PEAR_Error
*/
function &raiseError($code = DB_ERROR, $mode = null, $options = null,
$userinfo = null, $nativecode = null)
{
// The error is yet a DB error object
if (is_object($code)) {
// because we the static PEAR::raiseError, our global
// handler should be used if it is set
if ($mode === null && !empty($this->_default_error_mode)) {
$mode = $this->_default_error_mode;
$options = $this->_default_error_options;
}
$tmp = PEAR::raiseError($code, null, $mode, $options,
null, null, true);
return $tmp;
}
if ($userinfo === null) {
$userinfo = $this->last_query;
}
if ($nativecode) {
$userinfo .= ' [nativecode=' . trim($nativecode) . ']';
} else {
$userinfo .= ' [DB Error: ' . DB::errorMessage($code) . ']';
}
$tmp = PEAR::raiseError(null, $code, $mode, $options, $userinfo,
'DB_Error', true);
return $tmp;
}
// }}}
// {{{ errorNative()
/**
* Gets the DBMS' native error code produced by the last query
*
* @return mixed the DBMS' error code. A DB_Error object on failure.
*/
function errorNative()
{
return $this->raiseError(DB_ERROR_NOT_CAPABLE);
}
// }}}
// {{{ errorCode()
/**
* Maps native error codes to DB's portable ones
*
* Uses the <var>$errorcode_map</var> property defined in each driver.
*
* @param string|int $nativecode the error code returned by the DBMS
*
* @return int the portable DB error code. Return DB_ERROR if the
* current driver doesn't have a mapping for the
* $nativecode submitted.
*/
function errorCode($nativecode)
{
if (isset($this->errorcode_map[$nativecode])) {
return $this->errorcode_map[$nativecode];
}
// Fall back to DB_ERROR if there was no mapping.
return DB_ERROR;
}
// }}}
// {{{ errorMessage()
/**
* Maps a DB error code to a textual message
*
* @param integer $dbcode the DB error code
*
* @return string the error message corresponding to the error code
* submitted. FALSE if the error code is unknown.
*
* @see DB::errorMessage()
*/
function errorMessage($dbcode)
{
return DB::errorMessage($this->errorcode_map[$dbcode]);
}
// }}}
// {{{ tableInfo()
/**
* Returns information about a table or a result set
*
* The format of the resulting array depends on which <var>$mode</var>
* you select. The sample output below is based on this query:
* <pre>
* SELECT tblFoo.fldID, tblFoo.fldPhone, tblBar.fldId
* FROM tblFoo
* JOIN tblBar ON tblFoo.fldId = tblBar.fldId
* </pre>
*
* <ul>
* <li>
*
* <kbd>null</kbd> (default)
* <pre>
* [0] => Array (
* [table] => tblFoo
* [name] => fldId
* [type] => int
* [len] => 11
* [flags] => primary_key not_null
* )
* [1] => Array (
* [table] => tblFoo
* [name] => fldPhone
* [type] => string
* [len] => 20
* [flags] =>
* )
* [2] => Array (
* [table] => tblBar
* [name] => fldId
* [type] => int
* [len] => 11
* [flags] => primary_key not_null
* )
* </pre>
*
* </li><li>
*
* <kbd>DB_TABLEINFO_ORDER</kbd>
*
* <p>In addition to the information found in the default output,
* a notation of the number of columns is provided by the
* <samp>num_fields</samp> element while the <samp>order</samp>
* element provides an array with the column names as the keys and
* their location index number (corresponding to the keys in the
* the default output) as the values.</p>
*
* <p>If a result set has identical field names, the last one is
* used.</p>
*
* <pre>
* [num_fields] => 3
* [order] => Array (
* [fldId] => 2
* [fldTrans] => 1
* )
* </pre>
*
* </li><li>
*
* <kbd>DB_TABLEINFO_ORDERTABLE</kbd>
*
* <p>Similar to <kbd>DB_TABLEINFO_ORDER</kbd> but adds more
* dimensions to the array in which the table names are keys and
* the field names are sub-keys. This is helpful for queries that
* join tables which have identical field names.</p>
*
* <pre>
* [num_fields] => 3
* [ordertable] => Array (
* [tblFoo] => Array (
* [fldId] => 0
* [fldPhone] => 1
* )
* [tblBar] => Array (
* [fldId] => 2
* )
* )
* </pre>
*
* </li>
* </ul>
*
* The <samp>flags</samp> element contains a space separated list
* of extra information about the field. This data is inconsistent
* between DBMS's due to the way each DBMS works.
* + <samp>primary_key</samp>
* + <samp>unique_key</samp>
* + <samp>multiple_key</samp>
* + <samp>not_null</samp>
*
* Most DBMS's only provide the <samp>table</samp> and <samp>flags</samp>
* elements if <var>$result</var> is a table name. The following DBMS's
* provide full information from queries:
* + fbsql
* + mysql
*
* If the 'portability' option has <samp>DB_PORTABILITY_LOWERCASE</samp>
* turned on, the names of tables and fields will be lowercased.
*
* @param object|string $result DB_result object from a query or a
* string containing the name of a table.
* While this also accepts a query result
* resource identifier, this behavior is
* deprecated.
* @param int $mode either unused or one of the tableInfo modes:
* <kbd>DB_TABLEINFO_ORDERTABLE</kbd>,
* <kbd>DB_TABLEINFO_ORDER</kbd> or
* <kbd>DB_TABLEINFO_FULL</kbd> (which does both).
* These are bitwise, so the first two can be
* combined using <kbd>|</kbd>.
*
* @return array an associative array with the information requested.
* A DB_Error object on failure.
*
* @see DB_common::setOption()
*/
function tableInfo($result, $mode = null)
{
/*
* If the DB_<driver> class has a tableInfo() method, that one
* overrides this one. But, if the driver doesn't have one,
* this method runs and tells users about that fact.
*/
return $this->raiseError(DB_ERROR_NOT_CAPABLE);
}
// }}}
// {{{ getTables()
/**
* Lists the tables in the current database
*
* @return array the list of tables. A DB_Error object on failure.
*
* @deprecated Method deprecated some time before Release 1.2
*/
function getTables()
{
return $this->getListOf('tables');
}
// }}}
// {{{ getListOf()
/**
* Lists internal database information
*
* @param string $type type of information being sought.
* Common items being sought are:
* tables, databases, users, views, functions
* Each DBMS's has its own capabilities.
*
* @return array an array listing the items sought.
* A DB DB_Error object on failure.
*/
function getListOf($type)
{
$sql = $this->getSpecialQuery($type);
if ($sql === null) {
$this->last_query = '';
return $this->raiseError(DB_ERROR_UNSUPPORTED);
} elseif (is_int($sql) || DB::isError($sql)) {
// Previous error
return $this->raiseError($sql);
} elseif (is_array($sql)) {
// Already the result
return $sql;
}
// Launch this query
return $this->getCol($sql);
}
// }}}
// {{{ getSpecialQuery()
/**
* Obtains the query string needed for listing a given type of objects
*
* @param string $type the kind of objects you want to retrieve
*
* @return string the SQL query string or null if the driver doesn't
* support the object type requested
*
* @access protected
* @see DB_common::getListOf()
*/
function getSpecialQuery($type)
{
return $this->raiseError(DB_ERROR_UNSUPPORTED);
}
// }}}
// {{{ _rtrimArrayValues()
/**
* Right-trims all strings in an array
*
* @param array $array the array to be trimmed (passed by reference)
*
* @return void
*
* @access protected
*/
function _rtrimArrayValues(&$array)
{
foreach ($array as $key => $value) {
if (is_string($value)) {
$array[$key] = rtrim($value);
}
}
}
// }}}
// {{{ _convertNullArrayValuesToEmpty()
/**
* Converts all null values in an array to empty strings
*
* @param array $array the array to be de-nullified (passed by reference)
*
* @return void
*
* @access protected
*/
function _convertNullArrayValuesToEmpty(&$array)
{
foreach ($array as $key => $value) {
if (is_null($value)) {
$array[$key] = '';
}
}
}
// }}}
}
/*
* Local variables:
* tab-width: 4
* c-basic-offset: 4
* End:
*/
?>

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