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<?php
/* vim: set expandtab tabstop=4 shiftwidth=4 softtabstop=4: */
/**
* The PEAR DB driver for PHP's pgsql extension
* for interacting with PostgreSQL databases
*
* 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 Rui Hirokawa <hirokawa@php.net>
* @author Stig Bakken <ssb@php.net>
* @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: pgsql.php,v 1.134 2007/01/12 05:45:09 aharvey Exp $
* @link http://pear.php.net/package/DB
*/
/**
* Obtain the DB_common class so it can be extended from
*/
require_once 'DB/common.php';
/**
* The methods PEAR DB uses to interact with PHP's pgsql extension
* for interacting with PostgreSQL databases
*
* These methods overload the ones declared in DB_common.
*
* @category Database
* @package DB
* @author Rui Hirokawa <hirokawa@php.net>
* @author Stig Bakken <ssb@php.net>
* @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: 1.7.9
* @link http://pear.php.net/package/DB
*/
class DB_pgsql extends DB_common
{
// {{{ properties
/**
* The DB driver type (mysql, oci8, odbc, etc.)
* @var string
*/
var $phptype = 'pgsql';
/**
* The database syntax variant to be used (db2, access, etc.), if any
* @var string
*/
var $dbsyntax = 'pgsql';
/**
* The capabilities of this DB implementation
*
* The 'new_link' element contains the PHP version that first provided
* new_link support for this DBMS. Contains false if it's unsupported.
*
* Meaning of the 'limit' element:
* + 'emulate' = emulate with fetch row by number
* + 'alter' = alter the query
* + false = skip rows
*
* @var array
*/
var $features = array(
'limit' => 'alter',
'new_link' => '4.3.0',
'numrows' => true,
'pconnect' => true,
'prepare' => false,
'ssl' => true,
'transactions' => true,
);
/**
* A mapping of native error codes to DB error codes
* @var array
*/
var $errorcode_map = array(
);
/**
* The raw database connection created by PHP
* @var resource
*/
var $connection;
/**
* The DSN information for connecting to a database
* @var array
*/
var $dsn = array();
/**
* Should data manipulation queries be committed automatically?
* @var bool
* @access private
*/
var $autocommit = true;
/**
* The quantity of transactions begun
*
* {@internal While this is private, it can't actually be designated
* private in PHP 5 because it is directly accessed in the test suite.}}
*
* @var integer
* @access private
*/
var $transaction_opcount = 0;
/**
* The number of rows affected by a data manipulation query
* @var integer
*/
var $affected = 0;
/**
* The current row being looked at in fetchInto()
* @var array
* @access private
*/
var $row = array();
/**
* The number of rows in a given result set
* @var array
* @access private
*/
var $_num_rows = array();
// }}}
// {{{ constructor
/**
* This constructor calls <kbd>$this->DB_common()</kbd>
*
* @return void
*/
function DB_pgsql()
{
$this->DB_common();
}
// }}}
// {{{ connect()
/**
* Connect to the database server, log in and open the database
*
* Don't call this method directly. Use DB::connect() instead.
*
* PEAR DB's pgsql driver supports the following extra DSN options:
* + connect_timeout How many seconds to wait for a connection to
* be established. Available since PEAR DB 1.7.0.
* + new_link If set to true, causes subsequent calls to
* connect() to return a new connection link
* instead of the existing one. WARNING: this is
* not portable to other DBMS's. Available only
* if PHP is >= 4.3.0 and PEAR DB is >= 1.7.0.
* + options Command line options to be sent to the server.
* Available since PEAR DB 1.6.4.
* + service Specifies a service name in pg_service.conf that
* holds additional connection parameters.
* Available since PEAR DB 1.7.0.
* + sslmode How should SSL be used when connecting? Values:
* disable, allow, prefer or require.
* Available since PEAR DB 1.7.0.
* + tty This was used to specify where to send server
* debug output. Available since PEAR DB 1.6.4.
*
* Example of connecting to a new link via a socket:
* <code>
* require_once 'DB.php';
*
* $dsn = 'pgsql://user:pass@unix(/tmp)/dbname?new_link=true';
* $options = array(
* 'portability' => DB_PORTABILITY_ALL,
* );
*
* $db =& DB::connect($dsn, $options);
* if (PEAR::isError($db)) {
* die($db->getMessage());
* }
* </code>
*
* @param array $dsn the data source name
* @param bool $persistent should the connection be persistent?
*
* @return int DB_OK on success. A DB_Error object on failure.
*
* @link http://www.postgresql.org/docs/current/static/libpq.html#LIBPQ-CONNECT
*/
function connect($dsn, $persistent = false)
{
if (!PEAR::loadExtension('pgsql')) {
return $this->raiseError(DB_ERROR_EXTENSION_NOT_FOUND);
}
$this->dsn = $dsn;
if ($dsn['dbsyntax']) {
$this->dbsyntax = $dsn['dbsyntax'];
}
$protocol = $dsn['protocol'] ? $dsn['protocol'] : 'tcp';
$params = array('');
if ($protocol == 'tcp') {
if ($dsn['hostspec']) {
$params[0] .= 'host=' . $dsn['hostspec'];
}
if ($dsn['port']) {
$params[0] .= ' port=' . $dsn['port'];
}
} elseif ($protocol == 'unix') {
// Allow for pg socket in non-standard locations.
if ($dsn['socket']) {
$params[0] .= 'host=' . $dsn['socket'];
}
if ($dsn['port']) {
$params[0] .= ' port=' . $dsn['port'];
}
}
if ($dsn['database']) {
$params[0] .= ' dbname=\'' . addslashes($dsn['database']) . '\'';
}
if ($dsn['username']) {
$params[0] .= ' user=\'' . addslashes($dsn['username']) . '\'';
}
if ($dsn['password']) {
$params[0] .= ' password=\'' . addslashes($dsn['password']) . '\'';
}
if (!empty($dsn['options'])) {
$params[0] .= ' options=' . $dsn['options'];
}
if (!empty($dsn['tty'])) {
$params[0] .= ' tty=' . $dsn['tty'];
}
if (!empty($dsn['connect_timeout'])) {
$params[0] .= ' connect_timeout=' . $dsn['connect_timeout'];
}
if (!empty($dsn['sslmode'])) {
$params[0] .= ' sslmode=' . $dsn['sslmode'];
}
if (!empty($dsn['service'])) {
$params[0] .= ' service=' . $dsn['service'];
}
if (isset($dsn['new_link'])
&& ($dsn['new_link'] == 'true' || $dsn['new_link'] === true))
{
if (version_compare(phpversion(), '4.3.0', '>=')) {
$params[] = PGSQL_CONNECT_FORCE_NEW;
}
}
$connect_function = $persistent ? 'pg_pconnect' : 'pg_connect';
$ini = ini_get('track_errors');
$php_errormsg = '';
if ($ini) {
$this->connection = @call_user_func_array($connect_function,
$params);
} else {
@ini_set('track_errors', 1);
$this->connection = @call_user_func_array($connect_function,
$params);
@ini_set('track_errors', $ini);
}
if (!$this->connection) {
return $this->raiseError(DB_ERROR_CONNECT_FAILED,
null, null, null,
$php_errormsg);
}
return DB_OK;
}
// }}}
// {{{ disconnect()
/**
* Disconnects from the database server
*
* @return bool TRUE on success, FALSE on failure
*/
function disconnect()
{
$ret = @pg_close($this->connection);
$this->connection = null;
return $ret;
}
// }}}
// {{{ simpleQuery()
/**
* Sends a query to the database server
*
* @param string the SQL query string
*
* @return mixed + a PHP result resrouce for successful SELECT queries
* + the DB_OK constant for other successful queries
* + a DB_Error object on failure
*/
function simpleQuery($query)
{
$ismanip = $this->_checkManip($query);
$this->last_query = $query;
$query = $this->modifyQuery($query);
if (!$this->autocommit && $ismanip) {
if ($this->transaction_opcount == 0) {
$result = @pg_exec($this->connection, 'begin;');
if (!$result) {
return $this->pgsqlRaiseError();
}
}
$this->transaction_opcount++;
}
$result = @pg_exec($this->connection, $query);
if (!$result) {
return $this->pgsqlRaiseError();
}
/*
* Determine whether queries produce affected rows, result or nothing.
*
* This logic was introduced in version 1.1 of the file by ssb,
* though the regex has been modified slightly since then.
*
* PostgreSQL commands:
* ABORT, ALTER, BEGIN, CLOSE, CLUSTER, COMMIT, COPY,
* CREATE, DECLARE, DELETE, DROP TABLE, EXPLAIN, FETCH,
* GRANT, INSERT, LISTEN, LOAD, LOCK, MOVE, NOTIFY, RESET,
* REVOKE, ROLLBACK, SELECT, SELECT INTO, SET, SHOW,
* UNLISTEN, UPDATE, VACUUM
*/
if ($ismanip) {
$this->affected = @pg_affected_rows($result);
return DB_OK;
} elseif (preg_match('/^\s*\(*\s*(SELECT|EXPLAIN|FETCH|SHOW)\s/si',
$query))
{
$this->row[(int)$result] = 0; // reset the row counter.
$numrows = $this->numRows($result);
if (is_object($numrows)) {
return $numrows;
}
$this->_num_rows[(int)$result] = $numrows;
$this->affected = 0;
return $result;
} else {
$this->affected = 0;
return DB_OK;
}
}
// }}}
// {{{ nextResult()
/**
* Move the internal pgsql result pointer to the next available result
*
* @param a valid fbsql result resource
*
* @access public
*
* @return true if a result is available otherwise return false
*/
function nextResult($result)
{
return false;
}
// }}}
// {{{ fetchInto()
/**
* Places a row from the result set into the given array
*
* Formating of the array and the data therein are configurable.
* See DB_result::fetchInto() for more information.
*
* This method is not meant to be called directly. Use
* DB_result::fetchInto() instead. It can't be declared "protected"
* because DB_result is a separate object.
*
* @param resource $result the query result resource
* @param array $arr the referenced array to put the data in
* @param int $fetchmode how the resulting array should be indexed
* @param int $rownum the row number to fetch (0 = first row)
*
* @return mixed DB_OK on success, NULL when the end of a result set is
* reached or on failure
*
* @see DB_result::fetchInto()
*/
function fetchInto($result, &$arr, $fetchmode, $rownum = null)
{
$result_int = (int)$result;
$rownum = ($rownum !== null) ? $rownum : $this->row[$result_int];
if ($rownum >= $this->_num_rows[$result_int]) {
return null;
}
if ($fetchmode & DB_FETCHMODE_ASSOC) {
$arr = @pg_fetch_array($result, $rownum, PGSQL_ASSOC);
if ($this->options['portability'] & DB_PORTABILITY_LOWERCASE && $arr) {
$arr = array_change_key_case($arr, CASE_LOWER);
}
} else {
$arr = @pg_fetch_row($result, $rownum);
}
if (!$arr) {
return null;
}
if ($this->options['portability'] & DB_PORTABILITY_RTRIM) {
$this->_rtrimArrayValues($arr);
}
if ($this->options['portability'] & DB_PORTABILITY_NULL_TO_EMPTY) {
$this->_convertNullArrayValuesToEmpty($arr);
}
$this->row[$result_int] = ++$rownum;
return DB_OK;
}
// }}}
// {{{ freeResult()
/**
* Deletes the result set and frees the memory occupied by the result set
*
* This method is not meant to be called directly. Use
* DB_result::free() instead. It can't be declared "protected"
* because DB_result is a separate object.
*
* @param resource $result PHP's query result resource
*
* @return bool TRUE on success, FALSE if $result is invalid
*
* @see DB_result::free()
*/
function freeResult($result)
{
if (is_resource($result)) {
unset($this->row[(int)$result]);
unset($this->_num_rows[(int)$result]);
$this->affected = 0;
return @pg_freeresult($result);
}
return false;
}
// }}}
// {{{ quote()
/**
* @deprecated Deprecated in release 1.6.0
* @internal
*/
function quote($str)
{
return $this->quoteSmart($str);
}
// }}}
// {{{ quoteBoolean()
/**
* Formats a boolean value for use within a query in a locale-independent
* manner.
*
* @param boolean the boolean value to be quoted.
* @return string the quoted string.
* @see DB_common::quoteSmart()
* @since Method available since release 1.7.8.
*/
function quoteBoolean($boolean) {
return $boolean ? 'TRUE' : 'FALSE';
}
// }}}
// {{{ escapeSimple()
/**
* Escapes a string according to the current DBMS's standards
*
* {@internal PostgreSQL treats a backslash as an escape character,
* so they are escaped as well.
*
* @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)
{
if (function_exists('pg_escape_string')) {
return pg_escape_string($str);
} else {
return str_replace("'", "''", str_replace('\\', '\\\\', $str));
}
}
// }}}
// {{{ numCols()
/**
* Gets the number of columns in a result set
*
* This method is not meant to be called directly. Use
* DB_result::numCols() instead. It can't be declared "protected"
* because DB_result is a separate object.
*
* @param resource $result PHP's query result resource
*
* @return int the number of columns. A DB_Error object on failure.
*
* @see DB_result::numCols()
*/
function numCols($result)
{
$cols = @pg_numfields($result);
if (!$cols) {
return $this->pgsqlRaiseError();
}
return $cols;
}
// }}}
// {{{ numRows()
/**
* Gets the number of rows in a result set
*
* This method is not meant to be called directly. Use
* DB_result::numRows() instead. It can't be declared "protected"
* because DB_result is a separate object.
*
* @param resource $result PHP's query result resource
*
* @return int the number of rows. A DB_Error object on failure.
*
* @see DB_result::numRows()
*/
function numRows($result)
{
$rows = @pg_numrows($result);
if ($rows === null) {
return $this->pgsqlRaiseError();
}
return $rows;
}
// }}}
// {{{ 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)
{
// XXX if $this->transaction_opcount > 0, we should probably
// issue a warning here.
$this->autocommit = $onoff ? true : false;
return DB_OK;
}
// }}}
// {{{ commit()
/**
* Commits the current transaction
*
* @return int DB_OK on success. A DB_Error object on failure.
*/
function commit()
{
if ($this->transaction_opcount > 0) {
// (disabled) hack to shut up error messages from libpq.a
//@fclose(@fopen("php://stderr", "w"));
$result = @pg_exec($this->connection, 'end;');
$this->transaction_opcount = 0;
if (!$result) {
return $this->pgsqlRaiseError();
}
}
return DB_OK;
}
// }}}
// {{{ rollback()
/**
* Reverts the current transaction
*
* @return int DB_OK on success. A DB_Error object on failure.
*/
function rollback()
{
if ($this->transaction_opcount > 0) {
$result = @pg_exec($this->connection, 'abort;');
$this->transaction_opcount = 0;
if (!$result) {
return $this->pgsqlRaiseError();
}
}
return DB_OK;
}
// }}}
// {{{ 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->affected;
}
// }}}
// {{{ nextId()
/**
* Returns the next free id in a sequence
*
* @param string $seq_name name of the sequence
* @param boolean $ondemand when true, the seqence is automatically
* created if it does not exist
*
* @return int the next id number in the sequence.
* A DB_Error object on failure.
*
* @see DB_common::nextID(), DB_common::getSequenceName(),
* DB_pgsql::createSequence(), DB_pgsql::dropSequence()
*/
function nextId($seq_name, $ondemand = true)
{
$seqname = $this->getSequenceName($seq_name);
$repeat = false;
do {
$this->pushErrorHandling(PEAR_ERROR_RETURN);
$result =& $this->query("SELECT NEXTVAL('${seqname}')");
$this->popErrorHandling();
if ($ondemand && DB::isError($result) &&
$result->getCode() == DB_ERROR_NOSUCHTABLE) {
$repeat = true;
$this->pushErrorHandling(PEAR_ERROR_RETURN);
$result = $this->createSequence($seq_name);
$this->popErrorHandling();
if (DB::isError($result)) {
return $this->raiseError($result);
}
} else {
$repeat = false;
}
} while ($repeat);
if (DB::isError($result)) {
return $this->raiseError($result);
}
$arr = $result->fetchRow(DB_FETCHMODE_ORDERED);
$result->free();
return $arr[0];
}
// }}}
// {{{ createSequence()
/**
* Creates a new sequence
*
* @param string $seq_name name of the new sequence
*
* @return int DB_OK on success. A DB_Error object on failure.
*
* @see DB_common::createSequence(), DB_common::getSequenceName(),
* DB_pgsql::nextID(), DB_pgsql::dropSequence()
*/
function createSequence($seq_name)
{
$seqname = $this->getSequenceName($seq_name);
$result = $this->query("CREATE SEQUENCE ${seqname}");
return $result;
}
// }}}
// {{{ dropSequence()
/**
* Deletes a sequence
*
* @param string $seq_name name of the sequence to be deleted
*
* @return int DB_OK on success. A DB_Error object on failure.
*
* @see DB_common::dropSequence(), DB_common::getSequenceName(),
* DB_pgsql::nextID(), DB_pgsql::createSequence()
*/
function dropSequence($seq_name)
{
return $this->query('DROP SEQUENCE '
. $this->getSequenceName($seq_name));
}
// }}}
// {{{ modifyLimitQuery()
/**
* Adds LIMIT clauses to a query string according to current DBMS standards
*
* @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 LIMIT $count OFFSET $from";
}
// }}}
// {{{ pgsqlRaiseError()
/**
* Produces a DB_Error object regarding the current problem
*
* @param int $errno if the error is being manually raised pass a
* DB_ERROR* constant here. If this isn't passed
* the error information gathered from the DBMS.
*
* @return object the DB_Error object
*
* @see DB_common::raiseError(),
* DB_pgsql::errorNative(), DB_pgsql::errorCode()
*/
function pgsqlRaiseError($errno = null)
{
$native = $this->errorNative();
if (!$native) {
$native = 'Database connection has been lost.';
$errno = DB_ERROR_CONNECT_FAILED;
}
if ($errno === null) {
$errno = $this->errorCode($native);
}
return $this->raiseError($errno, null, null, null, $native);
}
// }}}
// {{{ errorNative()
/**
* Gets the DBMS' native error message produced by the last query
*
* {@internal Error messages are used instead of error codes
* in order to support older versions of PostgreSQL.}}
*
* @return string the DBMS' error message
*/
function errorNative()
{
return @pg_errormessage($this->connection);
}
// }}}
// {{{ errorCode()
/**
* Determines PEAR::DB error code from the database's text error message.
*
* @param string $errormsg error message returned from the database
* @return integer an error number from a DB error constant
*/
function errorCode($errormsg)
{
static $error_regexps;
if (!isset($error_regexps)) {
$error_regexps = array(
'/column .* (of relation .*)?does not exist/i'
=> DB_ERROR_NOSUCHFIELD,
'/(relation|sequence|table).*does not exist|class .* not found/i'
=> DB_ERROR_NOSUCHTABLE,
'/index .* does not exist/'
=> DB_ERROR_NOT_FOUND,
'/relation .* already exists/i'
=> DB_ERROR_ALREADY_EXISTS,
'/(divide|division) by zero$/i'
=> DB_ERROR_DIVZERO,
'/pg_atoi: error in .*: can\'t parse /i'
=> DB_ERROR_INVALID_NUMBER,
'/invalid input syntax for( type)? (integer|numeric)/i'
=> DB_ERROR_INVALID_NUMBER,
'/value .* is out of range for type \w*int/i'
=> DB_ERROR_INVALID_NUMBER,
'/integer out of range/i'
=> DB_ERROR_INVALID_NUMBER,
'/value too long for type character/i'
=> DB_ERROR_INVALID,
'/attribute .* not found|relation .* does not have attribute/i'
=> DB_ERROR_NOSUCHFIELD,
'/column .* specified in USING clause does not exist in (left|right) table/i'
=> DB_ERROR_NOSUCHFIELD,
'/parser: parse error at or near/i'
=> DB_ERROR_SYNTAX,
'/syntax error at/'
=> DB_ERROR_SYNTAX,
'/column reference .* is ambiguous/i'
=> DB_ERROR_SYNTAX,
'/permission denied/'
=> DB_ERROR_ACCESS_VIOLATION,
'/violates not-null constraint/'
=> DB_ERROR_CONSTRAINT_NOT_NULL,
'/violates [\w ]+ constraint/'
=> DB_ERROR_CONSTRAINT,
'/referential integrity violation/'
=> DB_ERROR_CONSTRAINT,
'/more expressions than target columns/i'
=> DB_ERROR_VALUE_COUNT_ON_ROW,
);
}
foreach ($error_regexps as $regexp => $code) {
if (preg_match($regexp, $errormsg)) {
return $code;
}
}
// Fall back to DB_ERROR if there was no mapping.
return DB_ERROR;
}
// }}}
// {{{ tableInfo()
/**
* Returns information about a table or a result set
*
* NOTE: only supports 'table' and 'flags' if <var>$result</var>
* is a table name.
*
* @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 $mode a valid tableInfo mode
*
* @return array an associative array with the information requested.
* A DB_Error object on failure.
*
* @see DB_common::tableInfo()
*/
function tableInfo($result, $mode = null)
{
if (is_string($result)) {
/*
* Probably received a table name.
* Create a result resource identifier.
*/
$id = @pg_exec($this->connection, "SELECT * FROM $result LIMIT 0");
$got_string = true;
} elseif (isset($result->result)) {
/*
* Probably received a result object.
* Extract the result resource identifier.
*/
$id = $result->result;
$got_string = false;
} else {
/*
* Probably received a result resource identifier.
* Copy it.
* Deprecated. Here for compatibility only.
*/
$id = $result;
$got_string = false;
}
if (!is_resource($id)) {
return $this->pgsqlRaiseError(DB_ERROR_NEED_MORE_DATA);
}
if ($this->options['portability'] & DB_PORTABILITY_LOWERCASE) {
$case_func = 'strtolower';
} else {
$case_func = 'strval';
}
$count = @pg_numfields($id);
$res = array();
if ($mode) {
$res['num_fields'] = $count;
}
for ($i = 0; $i < $count; $i++) {
$res[$i] = array(
'table' => $got_string ? $case_func($result) : '',
'name' => $case_func(@pg_fieldname($id, $i)),
'type' => @pg_fieldtype($id, $i),
'len' => @pg_fieldsize($id, $i),
'flags' => $got_string
? $this->_pgFieldFlags($id, $i, $result)
: '',
);
if ($mode & DB_TABLEINFO_ORDER) {
$res['order'][$res[$i]['name']] = $i;
}
if ($mode & DB_TABLEINFO_ORDERTABLE) {
$res['ordertable'][$res[$i]['table']][$res[$i]['name']] = $i;
}
}
// free the result only if we were called on a table
if ($got_string) {
@pg_freeresult($id);
}
return $res;
}
// }}}
// {{{ _pgFieldFlags()
/**
* Get a column's flags
*
* Supports "not_null", "default_value", "primary_key", "unique_key"
* and "multiple_key". The default value is passed through
* rawurlencode() in case there are spaces in it.
*
* @param int $resource the PostgreSQL result identifier
* @param int $num_field the field number
*
* @return string the flags
*
* @access private
*/
function _pgFieldFlags($resource, $num_field, $table_name)
{
$field_name = @pg_fieldname($resource, $num_field);
// Check if there's a schema in $table_name and update things
// accordingly.
$from = 'pg_attribute f, pg_class tab, pg_type typ';
if (strpos($table_name, '.') !== false) {
$from .= ', pg_namespace nsp';
list($schema, $table) = explode('.', $table_name);
$tableWhere = "tab.relname = '$table' AND tab.relnamespace = nsp.oid AND nsp.nspname = '$schema'";
} else {
$tableWhere = "tab.relname = '$table_name'";
}
$result = @pg_exec($this->connection, "SELECT f.attnotnull, f.atthasdef
FROM $from
WHERE tab.relname = typ.typname
AND typ.typrelid = f.attrelid
AND f.attname = '$field_name'
AND $tableWhere");
if (@pg_numrows($result) > 0) {
$row = @pg_fetch_row($result, 0);
$flags = ($row[0] == 't') ? 'not_null ' : '';
if ($row[1] == 't') {
$result = @pg_exec($this->connection, "SELECT a.adsrc
FROM $from, pg_attrdef a
WHERE tab.relname = typ.typname AND typ.typrelid = f.attrelid
AND f.attrelid = a.adrelid AND f.attname = '$field_name'
AND $tableWhere AND f.attnum = a.adnum");
$row = @pg_fetch_row($result, 0);
$num = preg_replace("/'(.*)'::\w+/", "\\1", $row[0]);
$flags .= 'default_' . rawurlencode($num) . ' ';
}
} else {
$flags = '';
}
$result = @pg_exec($this->connection, "SELECT i.indisunique, i.indisprimary, i.indkey
FROM $from, pg_index i
WHERE tab.relname = typ.typname
AND typ.typrelid = f.attrelid
AND f.attrelid = i.indrelid
AND f.attname = '$field_name'
AND $tableWhere");
$count = @pg_numrows($result);
for ($i = 0; $i < $count ; $i++) {
$row = @pg_fetch_row($result, $i);
$keys = explode(' ', $row[2]);
if (in_array($num_field + 1, $keys)) {
$flags .= ($row[0] == 't' && $row[1] == 'f') ? 'unique_key ' : '';
$flags .= ($row[1] == 't') ? 'primary_key ' : '';
if (count($keys) > 1)
$flags .= 'multiple_key ';
}
}
return trim($flags);
}
// }}}
// {{{ 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)
{
switch ($type) {
case 'tables':
return 'SELECT c.relname AS "Name"'
. ' FROM pg_class c, pg_user u'
. ' WHERE c.relowner = u.usesysid'
. " AND c.relkind = 'r'"
. ' AND NOT EXISTS'
. ' (SELECT 1 FROM pg_views'
. ' WHERE viewname = c.relname)'
. " AND c.relname !~ '^(pg_|sql_)'"
. ' UNION'
. ' SELECT c.relname AS "Name"'
. ' FROM pg_class c'
. " WHERE c.relkind = 'r'"
. ' AND NOT EXISTS'
. ' (SELECT 1 FROM pg_views'
. ' WHERE viewname = c.relname)'
. ' AND NOT EXISTS'
. ' (SELECT 1 FROM pg_user'
. ' WHERE usesysid = c.relowner)'
. " AND c.relname !~ '^pg_'";
case 'schema.tables':
return "SELECT schemaname || '.' || tablename"
. ' AS "Name"'
. ' FROM pg_catalog.pg_tables'
. ' WHERE schemaname NOT IN'
. " ('pg_catalog', 'information_schema', 'pg_toast')";
case 'views':
// Table cols: viewname | viewowner | definition
return 'SELECT viewname from pg_views WHERE schemaname'
. " NOT IN ('information_schema', 'pg_catalog')";
case 'users':
// cols: usename |usesysid|usecreatedb|usetrace|usesuper|usecatupd|passwd |valuntil
return 'SELECT usename FROM pg_user';
case 'databases':
return 'SELECT datname FROM pg_database';
case 'functions':
case 'procedures':
return 'SELECT proname FROM pg_proc WHERE proowner <> 1';
default:
return null;
}
}
// }}}
}
/*
* Local variables:
* tab-width: 4
* c-basic-offset: 4
* End:
*/
?>
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