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Common.php
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<?php
// +----------------------------------------------------------------------+
// | PHP versions 4 and 5 |
// +----------------------------------------------------------------------+
// | Copyright (c) 1998-2004 Manuel Lemos, Tomas V.V.Cox, |
// | Stig. S. Bakken, Lukas Smith |
// | All rights reserved. |
// +----------------------------------------------------------------------+
// | MDB2 is a merge of PEAR DB and Metabases that provides a unified DB |
// | API as well as database abstraction for PHP applications. |
// | This LICENSE is in the BSD license style. |
// | |
// | Redistribution and use in source and binary forms, with or without |
// | modification, are permitted provided that the following conditions |
// | are met: |
// | |
// | Redistributions of source code must retain the above copyright |
// | notice, this list of conditions and the following disclaimer. |
// | |
// | Redistributions in binary form must reproduce the above copyright |
// | notice, this list of conditions and the following disclaimer in the |
// | documentation and/or other materials provided with the distribution. |
// | |
// | Neither the name of Manuel Lemos, Tomas V.V.Cox, Stig. S. Bakken, |
// | Lukas Smith nor the names of his contributors may be used to endorse |
// | or promote products derived from this software without specific prior|
// | written permission. |
// | |
// | THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
// | "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
// | LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS |
// | FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE |
// | REGENTS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, |
// | INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, |
// | BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS|
// | OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED |
// | AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
// | LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY|
// | WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
// | POSSIBILITY OF SUCH DAMAGE. |
// +----------------------------------------------------------------------+
// | Author: Lukas Smith <smith@pooteeweet.org> |
// +----------------------------------------------------------------------+
//
// $Id$
require_once 'MDB2/LOB.php';
/**
* @package MDB2
* @category Database
* @author Lukas Smith <smith@pooteeweet.org>
*/
/**
* MDB2_Driver_Common: Base class that is extended by each MDB2 driver
*
* @package MDB2
* @category Database
* @author Lukas Smith <smith@pooteeweet.org>
*/
class MDB2_Driver_Datatype_Common extends MDB2_Module_Common
{
var $valid_types = array(
'text' => true,
'boolean' => true,
'integer' => true,
'decimal' => true,
'float' => true,
'date' => true,
'time' => true,
'timestamp' => true,
'clob' => true,
'blob' => true,
);
/**
* contains all LOB objects created with this MDB2 instance
* @var array
* @access protected
*/
var $lobs = array();
// }}}
// {{{ setResultTypes()
/**
* Define the list of types to be associated with the columns of a given
* result set.
*
* This function may be called before invoking fetchRow(), fetchOne()
* fetchCole() and fetchAll() so that the necessary data type
* conversions are performed on the data to be retrieved by them. If this
* function is not called, the type of all result set columns is assumed
* to be text, thus leading to not perform any conversions.
*
* @param resource $result result identifier
* @param string $types array variable that lists the
* data types to be expected in the result set columns. If this array
* contains less types than the number of columns that are returned
* in the result set, the remaining columns are assumed to be of the
* type text. Currently, the types clob and blob are not fully
* supported.
* @return mixed MDB2_OK on success, a MDB2 error on failure
* @access public
*/
function setResultTypes(&$result, $types)
{
$types = is_array($types) ? array_values($types) : array($types);
foreach ($types as $key => $type) {
if (!isset($this->valid_types[$type])) {
$db =& $this->getDBInstance();
if (PEAR::isError($db)) {
return $db;
}
return $db->raiseError(MDB2_ERROR_UNSUPPORTED, null, null,
'setResultTypes: ' . $type . ' for '. $key .' is not a supported column type');
}
}
$result->types = $types;
return MDB2_OK;
}
// }}}
// {{{ _baseConvertResult()
/**
* general type conversion method
*
* @param mixed $value refernce to a value to be converted
* @param int $type constant that specifies which type to convert to
* @return object a MDB2 error on failure
* @access protected
*/
function _baseConvertResult($value, $type)
{
switch ($type) {
case 'text':
return $value;
case 'integer':
return intval($value);
case 'boolean':
return $value == 'Y';
case 'decimal':
return $value;
case 'float':
return doubleval($value);
case 'date':
return $value;
case 'time':
return $value;
case 'timestamp':
return $value;
case 'clob':
case 'blob':
$this->lobs[] = array(
'buffer' => null,
'position' => 0,
'lob_index' => null,
'endOfLOB' => false,
'ressource' => $value,
'value' => null,
);
end($this->lobs);
$lob_index = key($this->lobs);
$this->lobs[$lob_index]['lob_index'] = $lob_index;
return fopen('MDB2LOB://'.$lob_index.'@'.$this->db_index, 'r+');
}
$db =& $this->getDBInstance();
if (PEAR::isError($db)) {
return $db;
}
return $db->raiseError(MDB2_ERROR_INVALID, null, null,
'attempt to convert result value to an unknown type ' . $type);
}
// }}}
// {{{ convertResult()
/**
* convert a value to a RDBMS indepdenant MDB2 type
*
* @param mixed $value value to be converted
* @param int $type constant that specifies which type to convert to
* @return mixed converted value or a MDB2 error on failure
* @access public
*/
function convertResult($value, $type)
{
if (is_null($value)) {
return null;
}
return $this->_baseConvertResult($value, $type);
}
// }}}
// {{{ convertResultRow()
/**
* convert a result row
*
* @param resource $result result identifier
* @param array $row array with data
* @return mixed MDB2_OK on success, a MDB2 error on failure
* @access public
*/
function convertResultRow($types, $row)
{
if (is_array($types)) {
$current_column = -1;
foreach ($row as $key => $column) {
++$current_column;
if (!isset($column) || !isset($types[$current_column])) {
continue;
}
$value = $this->convertResult($row[$key], $types[$current_column]);
if (PEAR::isError($value)) {
return $value;
}
$row[$key] = $value;
}
}
return $row;
}
// }}}
// {{{ getDeclaration()
/**
* Obtain DBMS specific SQL code portion needed to declare
* of the given type
*
* @param string $type type to which the value should be converted to
* @param string $name name the field to be declared.
* @param string $field definition of the field
* @return string DBMS specific SQL code portion that should be used to
* declare the specified field.
* @access public
*/
function getDeclaration($type, $name, $field)
{
if (!method_exists($this, "_get{$type}Declaration")) {
$db =& $this->getDBInstance();
if (PEAR::isError($db)) {
return $db;
}
return $db->raiseError('type not defined: '.$type);
}
return $this->{"_get{$type}Declaration"}($name, $field);
}
// }}}
// {{{ _getIntegerDeclaration()
/**
* Obtain DBMS specific SQL code portion needed to declare an integer type
* field to be used in statements like CREATE TABLE.
*
* @param string $name name the field to be declared.
* @param array $field associative array with the name of the properties
* of the field being declared as array indexes. Currently, the types
* of supported field properties are as follows:
*
* unsigned
* Boolean flag that indicates whether the field should be
* declared as unsigned integer if possible.
*
* default
* Integer value to be used as default for this field.
*
* notnull
* Boolean flag that indicates whether this field is constrained
* to not be set to null.
* @return string DBMS specific SQL code portion that should be used to
* declare the specified field.
* @access protected
*/
function _getIntegerDeclaration($name, $field)
{
if (array_key_exists('unsigned', $field) && $field['unsigned']) {
$db =& $this->getDBInstance();
if (PEAR::isError($db)) {
return $db;
}
$db->warnings[] = "unsigned integer field \"$name\" is being declared as signed integer";
}
$default = array_key_exists('default', $field) ? ' DEFAULT '.
$this->quote($field['default'], 'integer') : '';
$notnull = (array_key_exists('notnull', $field) && $field['notnull']) ? ' NOT NULL' : '';
return $name.' INT'.$default.$notnull;
}
// }}}
// {{{ _getTextDeclaration()
/**
* Obtain DBMS specific SQL code portion needed to declare an text type
* field to be used in statements like CREATE TABLE.
*
* @param string $name name the field to be declared.
* @param array $field associative array with the name of the properties
* of the field being declared as array indexes. Currently, the types
* of supported field properties are as follows:
*
* length
* Integer value that determines the maximum length of the text
* field. If this argument is missing the field should be
* declared to have the longest length allowed by the DBMS.
*
* default
* Text value to be used as default for this field.
*
* notnull
* Boolean flag that indicates whether this field is constrained
* to not be set to null.
* @return string DBMS specific SQL code portion that should be used to
* declare the specified field.
* @access protected
*/
function _getTextDeclaration($name, $field)
{
$default = array_key_exists('default', $field) ? ' DEFAULT '.
$this->quote($field['default'], 'text') : '';
$notnull = (array_key_exists('notnull', $field) && $field['notnull']) ? ' NOT NULL' : '';
$type = array_key_exists('length', $field) ? 'CHAR ('.$field['length'].')' : 'TEXT';
return $name.' '.$type.$default.$notnull;
}
// }}}
// {{{ _getCLOBDeclaration()
/**
* Obtain DBMS specific SQL code portion needed to declare an character
* large object type field to be used in statements like CREATE TABLE.
*
* @param string $name name the field to be declared.
* @param array $field associative array with the name of the properties
* of the field being declared as array indexes. Currently, the types
* of supported field properties are as follows:
*
* length
* Integer value that determines the maximum length of the large
* object field. If this argument is missing the field should be
* declared to have the longest length allowed by the DBMS.
*
* notnull
* Boolean flag that indicates whether this field is constrained
* to not be set to null.
* @return string DBMS specific SQL code portion that should be used to
* declare the specified field.
* @access protected
*/
function _getCLOBDeclaration($name, $field)
{
$notnull = (array_key_exists('notnull', $field) && $field['notnull']) ? ' NOT NULL' : '';
$type = array_key_exists('length', $field) ? 'CHAR ('.$field['length'].')' : 'TEXT';
return $name.' '.$type.$notnull;
}
// }}}
// {{{ _getBLOBDeclaration()
/**
* Obtain DBMS specific SQL code portion needed to declare an binary large
* object type field to be used in statements like CREATE TABLE.
*
* @param string $name name the field to be declared.
* @param array $field associative array with the name of the properties
* of the field being declared as array indexes. Currently, the types
* of supported field properties are as follows:
*
* length
* Integer value that determines the maximum length of the large
* object field. If this argument is missing the field should be
* declared to have the longest length allowed by the DBMS.
*
* notnull
* Boolean flag that indicates whether this field is constrained
* to not be set to null.
* @return string DBMS specific SQL code portion that should be used to
* declare the specified field.
* @access protected
*/
function _getBLOBDeclaration($name, $field)
{
$notnull = (array_key_exists('notnull', $field) && $field['notnull']) ? ' NOT NULL' : '';
$type = array_key_exists('length', $field) ? 'CHAR ('.$field['length'].')' : 'TEXT';
return $name.' '.$type.$notnull;
}
// }}}
// {{{ _getBooleanDeclaration()
/**
* Obtain DBMS specific SQL code portion needed to declare a boolean type
* field to be used in statements like CREATE TABLE.
*
* @param string $name name the field to be declared.
* @param array $field associative array with the name of the properties
* of the field being declared as array indexes. Currently, the types
* of supported field properties are as follows:
*
* default
* Boolean value to be used as default for this field.
*
* notnullL
* Boolean flag that indicates whether this field is constrained
* to not be set to null.
* @return string DBMS specific SQL code portion that should be used to
* declare the specified field.
* @access protected
*/
function _getBooleanDeclaration($name, $field)
{
$default = array_key_exists('default', $field) ? ' DEFAULT '.
$this->quote($field['default'], 'boolean') : '';
$notnull = (array_key_exists('notnull', $field) && $field['notnull']) ? ' NOT NULL' : '';
return $name.' CHAR (1)'.$default.$notnull;
}
// }}}
// {{{ _getDateDeclaration()
/**
* Obtain DBMS specific SQL code portion needed to declare a date type
* field to be used in statements like CREATE TABLE.
*
* @param string $name name the field to be declared.
* @param array $field associative array with the name of the properties
* of the field being declared as array indexes. Currently, the types
* of supported field properties are as follows:
*
* default
* Date value to be used as default for this field.
*
* notnull
* Boolean flag that indicates whether this field is constrained
* to not be set to null.
* @return string DBMS specific SQL code portion that should be used to
* declare the specified field.
* @access protected
*/
function _getDateDeclaration($name, $field)
{
$default = array_key_exists('default', $field) ? ' DEFAULT '.
$this->quote($field['default'], 'date') : '';
$notnull = (array_key_exists('notnull', $field) && $field['notnull']) ? ' NOT NULL' : '';
return $name.' CHAR ('.strlen('YYYY-MM-DD').')'.$default.$notnull;
}
// }}}
// {{{ _getTimestampDeclaration()
/**
* Obtain DBMS specific SQL code portion needed to declare a timestamp
* field to be used in statements like CREATE TABLE.
*
* @param string $name name the field to be declared.
* @param array $field associative array with the name of the properties
* of the field being declared as array indexes. Currently, the types
* of supported field properties are as follows:
*
* default
* Timestamp value to be used as default for this field.
*
* notnull
* Boolean flag that indicates whether this field is constrained
* to not be set to null.
* @return string DBMS specific SQL code portion that should be used to
* declare the specified field.
* @access protected
*/
function _getTimestampDeclaration($name, $field)
{
$default = array_key_exists('default', $field) ? ' DEFAULT '.
$this->quote($field['default'], 'timestamp') : '';
$notnull = (array_key_exists('notnull', $field) && $field['notnull']) ? ' NOT NULL' : '';
return $name.' CHAR ('.strlen('YYYY-MM-DD HH:MM:SS').')'.$default.$notnull;
}
// }}}
// {{{ _getTimeDeclaration()
/**
* Obtain DBMS specific SQL code portion needed to declare a time
* field to be used in statements like CREATE TABLE.
*
* @param string $name name the field to be declared.
* @param array $field associative array with the name of the properties
* of the field being declared as array indexes. Currently, the types
* of supported field properties are as follows:
*
* default
* Time value to be used as default for this field.
*
* notnull
* Boolean flag that indicates whether this field is constrained
* to not be set to null.
* @return string DBMS specific SQL code portion that should be used to
* declare the specified field.
* @access protected
*/
function _getTimeDeclaration($name, $field)
{
$default = array_key_exists('default', $field) ? ' DEFAULT '.
$this->quote($field['default'], 'time') : '';
$notnull = (array_key_exists('notnull', $field) && $field['notnull']) ? ' NOT NULL' : '';
return $name.' CHAR ('.strlen('HH:MM:SS').')'.$default.$notnull;
}
// }}}
// {{{ _getFloatDeclaration()
/**
* Obtain DBMS specific SQL code portion needed to declare a float type
* field to be used in statements like CREATE TABLE.
*
* @param string $name name the field to be declared.
* @param array $field associative array with the name of the properties
* of the field being declared as array indexes. Currently, the types
* of supported field properties are as follows:
*
* default
* Float value to be used as default for this field.
*
* notnull
* Boolean flag that indicates whether this field is constrained
* to not be set to null.
* @return string DBMS specific SQL code portion that should be used to
* declare the specified field.
* @access protected
*/
function _getFloatDeclaration($name, $field)
{
$default = array_key_exists('default', $field) ? ' DEFAULT '.
$this->quote($field['default'], 'float') : '';
$notnull = (array_key_exists('notnull', $field) && $field['notnull']) ? ' NOT NULL' : '';
return $name.' TEXT'.$default.$notnull;
}
// }}}
// {{{ _getDecimalDeclaration()
/**
* Obtain DBMS specific SQL code portion needed to declare a decimal type
* field to be used in statements like CREATE TABLE.
*
* @param string $name name the field to be declared.
* @param array $field associative array with the name of the properties
* of the field being declared as array indexes. Currently, the types
* of supported field properties are as follows:
*
* default
* Decimal value to be used as default for this field.
*
* notnull
* Boolean flag that indicates whether this field is constrained
* to not be set to null.
* @return string DBMS specific SQL code portion that should be used to
* declare the specified field.
* @access protected
*/
function _getDecimalDeclaration($name, $field)
{
$default = array_key_exists('default', $field) ? ' DEFAULT '.
$this->quote($field['default'], 'decimal') : '';
$notnull = (array_key_exists('notnull', $field) && $field['notnull']) ? ' NOT NULL' : '';
return $name.' TEXT'.$default.$notnull;
}
// }}}
// {{{ compareDefinition()
/**
* Obtain an array of changes that may need to applied
*
* @param array $current new definition
* @param array $previous old definition
* @return array containg all changes that will need to be applied
* @access public
*/
function compareDefinition($current, $previous)
{
$type = array_key_exists('type', $current) ? $current['type'] : null;
if (!method_exists($this, "_compare{$type}Definition")) {
$db =& $this->getDBInstance();
if (PEAR::isError($db)) {
return $db;
}
return $db->raiseError(MDB2_ERROR_UNSUPPORTED, null, null,
'type "'.$current['type'].'" is not yet supported');
}
if (!array_key_exists('type', $previous) || $previous['type'] != $type) {
return $current;
}
$change = $this->{"_compare{$type}Definition"}($current, $previous);
$previous_notnull = array_key_exists('notnull', $previous) ? $previous['notnull'] : false;
$notnull = array_key_exists('notnull', $current) ? $current['notnull'] : false;
if ($previous_notnull != $notnull) {
$change['notnull'] = true;
}
$previous_default = array_key_exists('default', $previous) ? $previous['default'] :
($previous_notnull ? '' : null);
$default = array_key_exists('default', $current) ? $current['default'] :
($notnull ? '' : null);
if ($previous_default !== $default) {
$change['default'] = true;
}
return $change;
}
// }}}
// {{{ _compareIntegerDefinition()
/**
* Obtain an array of changes that may need to applied to an integer field
*
* @param array $current new definition
* @param array $previous old definition
* @return array containg all changes that will need to be applied
* @access protected
*/
function _compareIntegerDefinition($current, $previous)
{
$change = array();
$previous_unsigned = array_key_exists('unsigned', $previous) ? $previous['unsigned'] : false;
$unsigned = array_key_exists('unsigned', $current) ? $current['unsigned'] : false;
if ($previous_unsigned != $unsigned) {
$change['unsigned'] = true;
}
$previous_autoincrement = array_key_exists('autoincrement', $previous) ? $previous['autoincrement'] : false;
$autoincrement = array_key_exists('autoincrement', $current) ? $current['autoincrement'] : false;
if ($previous_autoincrement != $autoincrement) {
$change['autoincrement'] = true;
}
return $change;
}
// }}}
// {{{ _compareTextDefinition()
/**
* Obtain an array of changes that may need to applied to an text field
*
* @param array $current new definition
* @param array $previous old definition
* @return array containg all changes that will need to be applied
* @access protected
*/
function _compareTextDefinition($current, $previous)
{
$change = array();
$previous_length = array_key_exists('length', $previous) ? $previous['length'] : 0;
$length = array_key_exists('length', $current) ? $current['length'] : 0;
if ($previous_length != $length) {
$change['length'] = true;
}
return $change;
}
// }}}
// {{{ _compareCLOBDefinition()
/**
* Obtain an array of changes that may need to applied to an CLOB field
*
* @param array $current new definition
* @param array $previous old definition
* @return array containg all changes that will need to be applied
* @access protected
*/
function _compareCLOBDefinition($current, $previous)
{
return $this->_compareTextDefinition($current, $previous);
}
// }}}
// {{{ _compareBLOBDefinition()
/**
* Obtain an array of changes that may need to applied to an BLOB field
*
* @param array $current new definition
* @param array $previous old definition
* @return array containg all changes that will need to be applied
* @access protected
*/
function _compareBLOBDefinition($current, $previous)
{
return $this->_compareTextDefinition($current, $previous);
}
// }}}
// {{{ _compareDateDefinition()
/**
* Obtain an array of changes that may need to applied to an date field
*
* @param array $current new definition
* @param array $previous old definition
* @return array containg all changes that will need to be applied
* @access protected
*/
function _compareDateDefinition($current, $previous)
{
return array();
}
// }}}
// {{{ _compareTimeDefinition()
/**
* Obtain an array of changes that may need to applied to an time field
*
* @param array $current new definition
* @param array $previous old definition
* @return array containg all changes that will need to be applied
* @access protected
*/
function _compareTimeDefinition($current, $previous)
{
return array();
}
// }}}
// {{{ _compareTimestampDefinition()
/**
* Obtain an array of changes that may need to applied to an timestamp field
*
* @param array $current new definition
* @param array $previous old definition
* @return array containg all changes that will need to be applied
* @access protected
*/
function _compareTimestampDefinition($current, $previous)
{
return array();
}
// }}}
// {{{ _compareBooleanDefinition()
/**
* Obtain an array of changes that may need to applied to an boolean field
*
* @param array $current new definition
* @param array $previous old definition
* @return array containg all changes that will need to be applied
* @access protected
*/
function _compareBooleanDefinition($current, $previous)
{
return array();
}
// }}}
// {{{ _compareFloatDefinition()
/**
* Obtain an array of changes that may need to applied to an float field
*
* @param array $current new definition
* @param array $previous old definition
* @return array containg all changes that will need to be applied
* @access protected
*/
function _compareFloatDefinition($current, $previous)
{
return array();
}
// }}}
// {{{ _compareDecimalDefinition()
/**
* Obtain an array of changes that may need to applied to an decimal field
*
* @param array $current new definition
* @param array $previous old definition
* @return array containg all changes that will need to be applied
* @access protected
*/
function _compareDecimalDefinition($current, $previous)
{
return array();
}
// }}}
// {{{ quote()
/**
* Convert a text value into a DBMS specific format that is suitable to
* compose query statements.
*
* @param string $value text string value that is intended to be converted.
* @param string $type type to which the value should be converted to
* @return string text string that represents the given argument value in
* a DBMS specific format.
* @access public
*/
function quote($value, $type = null, $quote = true)
{
$db =& $this->getDBInstance();
if (PEAR::isError($db)) {
return $db;
}
if (is_null($value)
|| ($value === '' && $db->options['portability'] & MDB2_PORTABILITY_EMPTY_TO_NULL)
) {
if (!$quote) {
return null;
}
return 'NULL';
}
if (is_null($type)) {
switch (gettype($value)) {
case 'integer':
$type = 'integer';
break;
case 'double':
// todo
$type = 'decimal';
$type = 'float';
break;
case 'boolean':
$type = 'boolean';
break;
case 'array':
case 'object':
$type = 'text';
break;
default:
if (preg_match('/^\d{4}-\d{2}-\d{2} \d{2}:\d{2}$/', $value)) {
$type = 'timestamp';
} elseif (preg_match('/^\d{2}:\d{2}$/', $value)) {
$type = 'time';
} elseif (preg_match('/^\d{4}-\d{2}-\d{2}$/', $value)) {
$type = 'date';
} else {
$type = 'text';
}
break;
}
}
if (!method_exists($this, "_quote{$type}")) {
return $db->raiseError('type not defined: '.$type);
}
$value = $this->{"_quote{$type}"}($value);
// ugly hack to remove single quotes
if (!$quote && isset($value[0]) && $value[0] === "'") {
$value = substr($value, 1, -1);
}
return $value;
}
// }}}
// {{{ _quoteInteger()
/**
* Convert a text value into a DBMS specific format that is suitable to
* compose query statements.
*
* @param string $value text string value that is intended to be converted.
* @return string text string that represents the given argument value in
* a DBMS specific format.
* @access protected
*/
function _quoteInteger($value)
{
return (int)$value;
}
// }}}
// {{{ _quoteText()
/**
* Convert a text value into a DBMS specific format that is suitable to
* compose query statements.
*
* @param string $value text string value that is intended to be converted.
* @return string text string that already contains any DBMS specific
* escaped character sequences.
* @access protected
*/
function _quoteText($value)
{
$db =& $this->getDBInstance();
if (PEAR::isError($db)) {
return $db;
}
return "'".$db->escape($value)."'";
}
// }}}
// {{{ _readFile()
/**
* Convert a text value into a DBMS specific format that is suitable to
* compose query statements.
*
* @param $value
* @return string text string that represents the given argument value in
* a DBMS specific format.
* @access protected
*/
function _readFile($value)
{
$close = false;
if (preg_match('/^(\w+:\/\/)(.*)$/', $value, $match)) {
$close = true;
if ($match[1] == 'file://') {
$value = $match[2];
}
$value = @fopen($value, 'r');
}
if (is_resource($value)) {
$db =& $this->getDBInstance();
if (PEAR::isError($db)) {
return $db;
}
$fp = $value;
$value = '';
while (!@feof($fp)) {
$value.= @fread($fp, $db->options['lob_buffer_length']);
}
if ($close) {
@fclose($fp);
}
}
return $value;
}
// }}}
// {{{ _quoteLOB()
/**
* Convert a text value into a DBMS specific format that is suitable to
* compose query statements.
*
* @param $value
* @return string text string that represents the given argument value in
* a DBMS specific format.
* @access protected
*/
function _quoteLOB($value)
{
$value = $this->_readFile($value);
return $this->_quoteText($value);
}
// }}}
// {{{ _quoteCLOB()
/**
* Convert a text value into a DBMS specific format that is suitable to
* compose query statements.
*
* @param $value
* @return string text string that represents the given argument value in
* a DBMS specific format.
* @access protected
*/
function _quoteCLOB($value)
{
return $this->_quoteLOB($value);
}
// }}}
// {{{ _quoteBLOB()
/**
* Convert a text value into a DBMS specific format that is suitable to
* compose query statements.
*
* @param $value
* @return string text string that represents the given argument value in
* a DBMS specific format.
* @access protected
*/
function _quoteBLOB($value)
{
return $this->_quoteLOB($value);
}
// }}}
// {{{ _quoteBoolean()
/**
* Convert a text value into a DBMS specific format that is suitable to
* compose query statements.
*
* @param string $value text string value that is intended to be converted.
* @return string text string that represents the given argument value in
* a DBMS specific format.
* @access protected
*/
function _quoteBoolean($value)
{
return ($value ? "'Y'" : "'N'");
}
// }}}
// {{{ _quoteDate()
/**
* Convert a text value into a DBMS specific format that is suitable to
* compose query statements.
*
* @param string $value text string value that is intended to be converted.
* @return string text string that represents the given argument value in
* a DBMS specific format.
* @access protected
*/
function _quoteDate($value)
{
return $this->_quoteText($value);
}
// }}}
// {{{ _quoteTimestamp()
/**
* Convert a text value into a DBMS specific format that is suitable to
* compose query statements.
*
* @param string $value text string value that is intended to be converted.
* @return string text string that represents the given argument value in
* a DBMS specific format.
* @access protected
*/
function _quoteTimestamp($value)
{
return $this->_quoteText($value);
}
// }}}
// {{{ _quoteTime()
/**
* Convert a text value into a DBMS specific format that is suitable to
* compose query statements.
*
* @param string $value text string value that is intended to be converted.
* @return string text string that represents the given argument value in
* a DBMS specific format.
* @access protected
*/
function _quoteTime($value)
{
return $this->_quoteText($value);
}
// }}}
// {{{ _quoteFloat()
/**
* Convert a text value into a DBMS specific format that is suitable to
* compose query statements.
*
* @param string $value text string value that is intended to be converted.
* @return string text string that represents the given argument value in
* a DBMS specific format.
* @access protected
*/
function _quoteFloat($value)
{
return $this->_quoteText($value);
}
// }}}
// {{{ _quoteDecimal()
/**
* Convert a text value into a DBMS specific format that is suitable to
* compose query statements.
*
* @param string $value text string value that is intended to be converted.
* @return string text string that represents the given argument value in
* a DBMS specific format.
* @access protected
*/
function _quoteDecimal($value)
{
return $this->_quoteText($value);
}
// }}}
// {{{ writeLOBToFile()
/**
* retrieve LOB from the database
*
* @param resource $lob stream handle
* @param string $file name of the file into which the LOb should be fetched
* @return mixed MDB2_OK on success, a MDB2 error on failure
* @access protected
*/
function writeLOBToFile($lob, $file)
{
$db =& $this->getDBInstance();
if (PEAR::isError($db)) {
return $db;
}
$fp = fopen($file, 'wb');
while (!feof($lob)) {
$result = fread($lob, $db->options['lob_buffer_length']);
$read = strlen($result);
if (fwrite($fp, $result, $read) != $read) {
fclose($fp);
return $db->raiseError(MDB2_ERROR, null, null,
'writeLOBToFile: could not write to the output file');
}
}
fclose($fp);
return MDB2_OK;
}
// }}}
// {{{ _retrieveLOB()
/**
* retrieve LOB from the database
*
* @param resource $lob stream handle
* @return mixed MDB2_OK on success, a MDB2 error on failure
* @access protected
*/
function _retrieveLOB(&$lob)
{
if (is_null($lob['value'])) {
$lob['value'] = $lob['ressource'];
}
return MDB2_OK;
}
// }}}
// {{{ readLOB()
/**
* Read data from large object input stream.
*
* @param resource $lob stream handle
* @param string $data reference to a variable that will hold data
* to be read from the large object input stream
* @param integer $length value that indicates the largest ammount ofdata
* to be read from the large object input stream.
* @return mixed the effective number of bytes read from the large object
* input stream on sucess or an MDB2 error object.
* @access public
* @see endOfLOB()
*/
function _readLOB($lob, $length)
{
return substr($lob['value'], $lob['position'], $length);
}
// }}}
// {{{ _endOfLOB()
/**
* Determine whether it was reached the end of the large object and
* therefore there is no more data to be read for the its input stream.
*
* @param resource $lob stream handle
* @return mixed true or false on success, a MDB2 error on failure
* @access protected
*/
function _endOfLOB($lob)
{
return $lob['endOfLOB'];
}
// }}}
// {{{ destroyLOB()
/**
* Free any resources allocated during the lifetime of the large object
* handler object.
*
* @param resource $lob stream handle
* @access public
*/
function destroyLOB($lob)
{
$lob_data = stream_get_meta_data($lob);
$lob_index = $lob_data['wrapper_data']->lob_index;
fclose($lob);
if (isset($this->lobs[$lob_index])) {
$this->_destroyLOB($lob_index);
unset($this->lobs[$lob_index]);
}
return MDB2_OK;
}
// }}}
// {{{ _destroyLOB()
/**
* Free any resources allocated during the lifetime of the large object
* handler object.
*
* @param int $lob_index from the lob array
* @access private
*/
function _destroyLOB($lob_index)
{
return MDB2_OK;
}
// }}}
// {{{ implodeArray()
/**
* apply a type to all values of an array and return as a comma seperated string
* useful for generating IN statements
*
* @access public
*
* @param array $array data array
* @param string $type determines type of the field
*
* @return string comma seperated values
*/
function implodeArray($array, $type = false)
{
if (!is_array($array) || empty($array)) {
return 'NULL';
}
if ($type) {
foreach ($array as $value) {
$return[] = $this->quote($value, $type);
}
} else {
$return = $array;
}
return implode(', ', $return);
}
}
?>

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