Source for file pgsql.php
Documentation is available at pgsql.php
// +----------------------------------------------------------------------+
// +----------------------------------------------------------------------+
// | Copyright (c) 1998-2004 Manuel Lemos, Tomas V.V.Cox, |
// | Stig. S. Bakken, Lukas Smith |
// | All rights reserved. |
// +----------------------------------------------------------------------+
// | MDB 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 |
// | 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: Paul Cooper <pgc@ucecom.com> |
// +----------------------------------------------------------------------+
// $Id: pgsql.php,v 1.62.4.20 2004/03/12 16:19:30 lsmith Exp $
require_once('MDB/Common.php');
* - Creation of new databases is based on database template1.
* - The decimal type fields are emulated with integer fields.
* - PostgreSQL stores large objects in files managed by the server.
* Tables with large object fields only store identifiers pointing to those
* files. If you delete or update rows of those tables, the actual large
* object files are not deleted from the server file system. Therefore you may
* need to reclaim large object field space by deleting those files manually.
* @author Paul Cooper <pgc@ucecom.com>
$this->phptype = 'pgsql';
$this->dbsyntax = 'pgsql';
$this->supported['Sequences'] = 1;
$this->supported['Indexes'] = 1;
$this->supported['SummaryFunctions'] = 1;
$this->supported['OrderByText'] = 1;
$this->supported['Transactions'] = 1;
$this->supported['CurrId'] = 1;
$this->supported['SelectRowRanges'] = 1;
$this->supported['LOBs'] = 1;
$this->supported['Replace'] = 1;
$this->supported['SubSelects'] = 1;
* Map native error codes to DB's portable ones. Requires that
* the DB implementation's constructor fills in the $errorcode_map
* @param $nativecode the native error code, as returned by the backend
* database extension (string or integer)
* @return int a portable MDB error code, or FALSE if this DB
* implementation has no mapping for the given error code.
if (empty ($error_regexps)) {
'/([Tt]able does not exist\.|[Rr]elation [\"\'].*[\"\'] does not exist|[Ss]equence does not exist|[Cc]lass ".+" not found)$/' => MDB_ERROR_NOSUCHTABLE,
'/[Rr]elation [\"\'].*[\"\'] already exists|[Cc]annot insert a duplicate key into (a )?unique index.*/' => MDB_ERROR_ALREADY_EXISTS,
'/ttribute [\"\'].*[\"\'] not found$|[Rr]elation [\"\'].*[\"\'] does not have attribute [\"\'].*[\"\']/' => MDB_ERROR_NOSUCHFIELD,
foreach ($error_regexps as $regexp => $code) {
// Fall back to MDB_ERROR if there was no mapping.
* This method is used to communicate an error and invoke error
* callbacks etc. Basically a wrapper for MDB::raiseError
* that checks for native error msgs.
* @param integer $errno error code
* @param string $message userinfo message
* @return object a PEAR error object
$error = @pg_errormessage ();
* Get the native error code of the last error (if any) that
* occured on the current connection.
* @return int native pgsql error code
* Define whether database changes done on the database be automatically
* committed. This function may also implicitly start or end a transaction.
* @param boolean $auto_commit flag that indicates whether the database
* changes should be committed right after executing every query
* statement. If this argument is 0 a transaction implicitly started.
* Otherwise, if a transaction is in progress it is ended by committing
* any database changes that were pending.
* @return mixed MDB_OK on success, a MDB error on failure
$this->debug('AutoCommit: '. ($auto_commit ? 'On' : 'Off'));
if ($this->auto_commit == $auto_commit) {
if (MDB::isError($result = $this->_doQuery ($auto_commit ? 'END' : 'BEGIN')))
$this->auto_commit = $auto_commit;
$this->in_transaction = !$auto_commit;
* Commit the database changes done during a transaction that is in
* progress. This function may only be called when auto-committing is
* disabled, otherwise it will fail. Therefore, a new transaction is
* implicitly started after committing the pending changes.
* @return mixed MDB_OK on success, a MDB error on failure
$this->debug('Commit Transaction');
if ($this->auto_commit) {
return($this->raiseError(MDB_ERROR, NULL , NULL , 'Commit: transaction changes are being auto commited'));
return($this->_doQuery ('COMMIT') && $this->_doQuery ('BEGIN'));
* Cancel any database changes done during a transaction that is in
* progress. This function may only be called when auto-committing is
* disabled, otherwise it will fail. Therefore, a new transaction is
* implicitly started after canceling the pending changes.
* @return mixed MDB_OK on success, a MDB error on failure
$this->debug('Rollback Transaction');
if ($this->auto_commit) {
return($this->raiseError(MDB_ERROR, NULL , NULL , 'Rollback: transactions can not be rolled back when changes are auto commited'));
return($this->_doQuery ('ROLLBACK') && $this->_doQuery ('BEGIN'));
* Does the grunt work of connecting to the database
* @return mixed connection resource on success, MDB_Error on failure
function _doConnect ($database_name, $persistent)
$function = ($persistent ? 'pg_pconnect' : 'pg_connect');
$port = (isset ($this->port) ? $this->port : '');
if ($database_name == '') {
$database_name = 'template1';
$connect_string = 'dbname='. $database_name;
$connect_string .= ' host='. $this->host;
$connect_string .= ' port='. strval($port);
$connect_string .= ' user='. $this->user;
if ($this->password != '') {
$connect_string .= ' password='. $this->password;
if (($connection = @$function($connect_string)) > 0 ) {
if (isset ($php_errormsg)) {
$error_msg = $php_errormsg;
$error_msg = 'Could not connect to PostgreSQL server';
* Connect to the database
* @return TRUE on success, MDB_Error on failure
$port = (isset ($this->options['port']) ? $this->options['port'] : '');
$this->affected_rows = -1;
if(!PEAR ::loadExtension ($this->phptype)) {
NULL , NULL , 'extension '. $this->phptype. ' is not compiled into PHP',
$connection = $this->_doConnect ('template1', 0 );
if (($result = @pg_exec ($connection, 'BEGIN'))) {
if (!isset ($php_errormsg) || strcmp($php_errormsg, 'This compilation does not support pg_cmdtuples()')) {
$this->supported['AffectedRows'] = 1;
$connection = $this->_doConnect ($this->database_name, $this->options['persistent']);
if (!$this->auto_commit && MDB::isError($trans_result = $this->_doQuery ('BEGIN'))) {
$this->affected_rows = -1;
* Close the database connection
if (!$this->auto_commit) {
$this->affected_rows = -1;
unset ($GLOBALS['_MDB_databases'][$this->database]);
* @param string $query the SQL query
* @return mixed result identifier if query executed, else MDB_error
function _doQuery ($query)
if (($result = @pg_Exec ($this->connection, $query))) {
$this->affected_rows = (isset ($this->supported['AffectedRows']) ? @pg_cmdtuples ($result) : -1 );
// {{{ _standaloneQuery()
function _standaloneQuery ($query)
if (($connection = $this->_doConnect ('template1', 0 )) == 0 ) {
if (!($result = @pg_Exec ($connection, $query))) {
$this->raiseError(MDB_ERROR, NULL , NULL , '_standaloneQuery: ' . @pg_errormessage ($connection));
* Send a query to the database and return any results
* @param string $query the SQL query
* @param array $types array that contains the types of the columns in
* @return mixed result identifier if query executed, else MDB_error
function query($query, $types = NULL )
$this->debug(" Query: $query" );
$this->last_query = $query;
$first = $this->first_selected_row;
$limit = $this->selected_row_limit;
$this->first_selected_row = $this->selected_row_limit = 0;
if (!$ismanip && $limit > 0 ) {
if ($this->auto_commit && MDB::isError($this->_doQuery ('BEGIN'))) {
$result = $this->_doQuery ('DECLARE select_cursor SCROLL CURSOR FOR '. $query);
if ($first > 0 && MDB::isError($result = $this->_doQuery (" MOVE FORWARD $first FROM select_cursor" ))) {
if (MDB::isError($result = $this->_doQuery (" FETCH FORWARD $limit FROM select_cursor" ))) {
if ($this->auto_commit && MDB::isError($result2 = $this->_doQuery ('END'))) {
$result = $this->_doQuery ($query);
$this->affected_rows = @pg_cmdtuples ($result);
} elseif ((preg_match('/^\s*\(?\s*SELECT\s+/si', $query)
&& !preg_match('/^\s*\(?\s*SELECT\s+INTO\s/si', $query)
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,
$result_value = intval($result);
$this->affected_rows = 0;
* Retrieve the names of columns returned by the DBMS in a query result.
* @param resource $result result identifier
* @return mixed associative array variable
* that holds the names of columns. The indexes of the array are
* the column names mapped to lower case and the values are the
* respective numbers of the columns starting from 0. Some DBMS may
* not return any columns when the result set does not contain any
$result_value = intval($result);
return($this->raiseError(MDB_ERROR, NULL , NULL , 'Get Column Names: specified an nonexistant result set'));
if (!isset ($this->columns[$result_value])) {
$this->columns[$result_value] = array ();
$columns = @pg_numfields ($result);
for($column = 0; $column < $columns; $column++ ) {
$field_name = @pg_fieldname ($result, $column);
if ($this->options['optimize'] == 'portability') {
$this->columns[$result_value][$field_name] = $column;
return($this->columns[$result_value]);
* Count the number of columns returned by the DBMS in a query result.
* @param resource $result result identifier
* @return mixed integer value with the number of columns, a MDB error
$result_value = intval($result);
return($this->raiseError(MDB_ERROR, NULL , NULL , 'numCols: specified an nonexistant result set'));
return(pg_numfields ($result));
* check if the end of the result set has been reached
* @param resource $result result identifier
* @return mixed TRUE or FALSE on sucess, a MDB error on failure
$result_value = intval($result);
return($this->raiseError(MDB_ERROR, NULL , NULL , 'End of result attempted to check the end of an unknown result'));
* fetch value from a result set
* @param resource $result result identifier
* @param int $row number of the row where the data can be found
* @param int $field field number where the data can be found
* @return mixed string on success, a MDB error on failure
function fetch($result, $row, $field)
$result_value = intval($result);
$res = @pg_result ($result, $row, $field);
if ($res === FALSE && $res != NULL ) {
* fetch a float value from a result set
* @param int $lob handle to a lob created by the createLob() function
* @return mixed MDB_OK on success, a MDB error on failure
function _retrieveLob ($lob)
if (!isset ($this->lobs[$lob])) {
'Retrieve LOB: did not specified a valid lob'));
if (!isset ($this->lobs[$lob]['Value'])) {
if ($this->auto_commit) {
'Retrieve LOB: ' . @pg_errormessage ($this->connection)));
$this->lobs[$lob]['InTransaction'] = 1;
$this->lobs[$lob]['Value'] = $this->fetch($this->lobs[$lob]['Result'], $this->lobs[$lob]['Row'], $this->lobs[$lob]['Field']);
if (!($this->lobs[$lob]['Handle'] = @pg_loopen ($this->connection, $this->lobs[$lob]['Value'], 'r'))) {
if (isset ($this->lobs[$lob]['InTransaction'])) {
unset ($this->lobs[$lob]['InTransaction']);
unset ($this->lobs[$lob]['Value']);
'Retrieve LOB: ' . @pg_errormessage ($this->connection)));
* 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 int $lob handle to a lob created by the createLob() function
* @return mixed TRUE or FALSE on success, a MDB error on failure
$lobresult = $this->_retrieveLob ($lob);
return(isset ($this->lobs[$lob]['EndOfLOB']));
* Read data from large object input stream.
* @param int $lob handle to a lob created by the createLob() function
* @param blob $data reference to a variable that will hold data to be
* read from the large object input stream
* @param int $length integer value that indicates the largest ammount of
* data to be read from the large object input stream.
* @return mixed length on success, a MDB error on failure
function _readResultLob ($lob, &$data, $length)
$lobresult = $this->_retrieveLob ($lob);
$data = @pg_loread ($this->lobs[$lob]['Handle'], $length);
'Read Result LOB: ' . @pg_errormessage ($this->connection));
if (($length = strlen($data)) == 0 ) {
$this->lobs[$lob]['EndOfLOB'] = 1;
// {{{ _destroyResultLob()
* Free any resources allocated during the lifetime of the large object
* @param int $lob handle to a lob created by the createLob() function
function _destroyResultLob ($lob)
if (isset ($this->lobs[$lob])) {
if (isset ($this->lobs[$lob]['Value'])) {
@pg_loclose ($this->lobs[$lob]['Handle']);
if (isset ($this->lobs[$lob]['InTransaction'])) {
* fetch a clob value from a result set
* @param resource $result result identifier
* @param int $row number of the row where the data can be found
* @param int $field field number where the data can be found
* @return mixed content of the specified data cell, a MDB error on failure,
return($this->fetchLob($result, $row, $field));
* fetch a blob value from a result set
* @param resource $result result identifier
* @param int $row number of the row where the data can be found
* @param int $field field number where the data can be found
* @return mixed content of the specified data cell, a MDB error on failure
return($this->fetchLob($result, $row, $field));
* convert a value to a RDBMS indepdenant MDB type
* @param mixed $value value to be converted
* @param int $type constant that specifies which type to convert to
* @return mixed converted value or a MDB error on failure
return($this->_baseConvertResult ($value, $type));
* Determine whether the value of a query result located in given row and
* @param resource $result result identifier
* @param int $row number of the row where the data can be found
* @param int $field field number where the data can be found
* @return mixed TRUE or FALSE on success, a MDB error on failure
$result_value = intval($result);
return(@pg_fieldisnull ($result, $row, $field));
* returns the number of rows in a result object
* @param ressource $result a valid result ressouce pointer
* @return mixed MDB_Error or the number of rows
return(@pg_numrows ($result));
* Free the internal resources associated with $result.
* @param $result result identifier
* @return boolean TRUE on success, FALSE if $result is invalid
$result_value = intval($result);
if(isset ($this->columns[$result_value])) {
unset ($this->columns[$result_value]);
if(isset ($this->result_types[$result_value])) {
unset ($this->result_types[$result_value]);
return(@pg_freeresult ($result));
// {{{ 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 string $field associative array with the name of the properties
* of the field being declared as array indexes. Currently, the types
* of supported field properties are as follows:
* Integer value that determines the maximum length of the text
* field. If this argument is missing the field should be
* declared to have the longest length allowed by the DBMS.
* Text value to be used as default for this field.
* Boolean flag that indicates whether this field is constrained
* @return string DBMS specific SQL code portion that should be used to
* declare the specified field.
return((isset ($field['length']) ? " $name VARCHAR (" . $field['length'] . ')' : " $name TEXT" ) . (isset ($field['default']) ? " DEFAULT '" . $field['default'] . "'" : '') . (isset ($field['notnull']) ? ' NOT NULL' : ''));
// {{{ 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 string $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:
* 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.
* Boolean flag that indicates whether this field is constrained
* @return string DBMS specific SQL code portion that should be used to
* declare the specified field.
return(" $name OID". (isset ($field['notnull']) ? ' NOT NULL' : ''));
// {{{ 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 string $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:
* 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.
* Boolean flag that indicates whether this field is constrained
* @return string DBMS specific SQL code portion that should be used to
* declare the specified field.
return(" $name OID". (isset ($field['notnull']) ? ' NOT NULL' : ''));
// {{{ 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 string $field associative array with the name of the properties
* of the field being declared as array indexes. Currently, the types
* of supported field properties are as follows:
* Date value to be used as default for this field.
* Boolean flag that indicates whether this field is constrained
* @return string DBMS specific SQL code portion that should be used to
* declare the specified field.
return($name. ' DATE'. (isset ($field['default']) ? ' DEFAULT \''. $field['default'] . "'" : ''). (isset ($field['notnull']) ? ' NOT NULL' : ''));
// {{{ 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 string $field associative array with the name of the properties
* of the field being declared as array indexes. Currently, the types
* of supported field properties are as follows:
* Time value to be used as default for this field.
* Boolean flag that indicates whether this field is constrained
* @return string DBMS specific SQL code portion that should be used to
* declare the specified field.
return($name. ' TIME'. (isset ($field['default']) ? ' DEFAULT \''. $field['default']. '\'' : ''). (isset ($field['notnull']) ? ' NOT NULL' : ''));
// {{{ 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 string $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:
* Float value to be used as default for this field.
* Boolean flag that indicates whether this field is constrained
* @return string DBMS specific SQL code portion that should be used to
* declare the specified field.
return(" $name FLOAT8 ". (isset ($field['default']) ? ' DEFAULT '. $this->getFloatValue($field['default']) : ''). (isset ($field['notnull']) ? ' NOT NULL' : ''));
// {{{ 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 string $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:
* Decimal value to be used as default for this field.
* Boolean flag that indicates whether this field is constrained
* @return string DBMS specific SQL code portion that should be used to
* declare the specified field.
return(" $name INT8 ". (isset ($field['default']) ? ' DEFAULT '. $this->getDecimalValue($field['default']) : ''). (isset ($field['notnull']) ? ' NOT NULL' : ''));
* Convert a text value into a DBMS specific format that is suitable to
* compose query statements.
* @param resource $prepared_query query handle from prepare()
* @return string text string that represents the given argument value in
* a DBMS specific format.
function _getLobValue ($prepared_query, $parameter, $lob)
if ($this->auto_commit && !@pg_exec ($this->connection, 'BEGIN')) {
'_getLobValue: error starting transaction'));
if (($handle = @pg_loopen ($this->connection, $lo, 'w'))) {
$result = $this->readLob($lob, $data, $this->options['lob_buffer_length']);
if (!@pg_lowrite ($handle, $data)) {
'Get LOB field value: ' . @pg_errormessage ($this->connection));
'Get LOB field value: ' . @pg_errormessage ($this->connection));
if ($this->auto_commit) {
* Convert a text value into a DBMS specific format that is suitable to
* compose query statements.
* @param resource $prepared_query query handle from prepare()
* @return string text string that represents the given argument value in
* a DBMS specific format.
return($this->_getLobValue ($prepared_query, $parameter, $clob));
* Convert a text value into a DBMS specific format that is suitable to
* compose query statements.
* @param resource $prepared_query query handle from prepare()
* @return string text string that represents the given argument value in
* a DBMS specific format.
return($this->_getLobValue ($prepared_query, $parameter, $blob));
* Convert a text value into a DBMS specific format that is suitable to
* compose query statements.
* @param string $value text string value that is intended to be converted.
* @return string text string that represents the given argument value in
* a DBMS specific format.
return(($value === NULL ) ? 'NULL' : $value);
* 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.
* returns the next free id of a sequence
* @param string $seq_name name of the sequence
* @param boolean $ondemand when TRUE the seqence is
* automatic created, if it
* @return mixed MDB_Error or id
function nextId($seq_name, $ondemand = TRUE )
$this->pushErrorHandling (PEAR_ERROR_RETURN );
$result = $this->query(" SELECT NEXTVAL('$seqname')" );
$this->popErrorHandling ();
* returns the current id of a sequence
* @param string $seq_name name of the sequence
* @return mixed MDB_Error or id
return($this->raiseError(MDB_ERROR, NULL , NULL , 'currId: Unable to select from ' . $seqname) );
return($this->raiseError(MDB_ERROR, NULL , NULL , 'currId: could not find value in sequence table'));
* Fetch a row and return data in an array.
* @param resource $result result identifier
* @param int $fetchmode ignored
* @param int $rownum the row number to fetch
* @return mixed data array or NULL on success, a MDB error on failure
function fetchInto($result, $fetchmode = MDB_FETCHMODE_DEFAULT , $rownum = NULL )
$result_value = intval($result);
$fetchmode = $this->fetchmode;
$row = @pg_fetch_array ($result, $rownum, PGSQL_ASSOC );
if (is_array($row) && $this->options['optimize'] == 'portability') {
$row = @pg_fetch_row ($result, $rownum);
if ($this->options['autofree']) {
if (isset ($this->result_types[$result_value])) {
* Move the internal pgsql result pointer to the next available result
* @param a valid fbsql result resource
* @return true if a result is available otherwise return false
* returns meta data about the result set
* @param mixed $resource PostgreSQL result identifier or table name
* @param mixed $mode depends on implementation
* @return array an nested array, or a MDB error
* depending on $mode, metadata returns the following values:
* - mode is FALSE (default):
* [0]['table'] table name
* [0]['len'] field length
* [0]['flags'] field flags
* - mode is MDB_TABLEINFO_ORDER
* ['num_fields'] number of metadata records
* [0]['table'] table name
* [0]['len'] field length
* [0]['flags'] field flags
* ['order'][field name] index of field named 'field name'
* The last one is used, if you have a field name, but no index.
* Test: if (isset($result['meta']['myfield'])) { ...
* - mode is MDB_TABLEINFO_ORDERTABLE
* the same as above. but additionally
* ['ordertable'][table name][field name] index of field
* this is, because if you have fields from different
* tables with the same field name * they override each
* other with MDB_TABLEINFO_ORDER
* you can combine MDB_TABLEINFO_ORDER and
* MDB_TABLEINFO_ORDERTABLE with MDB_TABLEINFO_ORDER |
* MDB_TABLEINFO_ORDERTABLE * or with MDB_TABLEINFO_FULL
// if $result is a string, then we want information about a
// table without a resultset
$id = @pg_exec ($this->connection, " SELECT * FROM $result LIMIT 0" );
} else { // else we want information about a resultset
$count = @pg_numfields ($id);
// made this IF due to performance (one if is faster than $count if's)
for ($i = 0; $i < $count; $i++ ) {
$res[$i]['table'] = (is_string($result)) ? $result : '';
$res[$i]['name'] = @pg_fieldname ($id, $i);
$res[$i]['type'] = @pg_fieldtype ($id, $i);
$res[$i]['len'] = @pg_fieldsize ($id, $i);
$res[$i]['flags'] = (is_string($result)) ? $this->_pgFieldflags ($id, $i, $result) : '';
$res['num_fields'] = $count;
for ($i = 0; $i < $count; $i++ ) {
$res[$i]['table'] = (is_string($result)) ? $result : '';
$res[$i]['name'] = @pg_fieldname ($id, $i);
$res[$i]['type'] = @pg_fieldtype ($id, $i);
$res[$i]['len'] = @pg_fieldsize ($id, $i);
$res[$i]['flags'] = (is_string($result)) ? $this->_pgFieldFlags ($id, $i, $result) : '';
$res['order'][$res[$i]['name']] = $i;
$res['ordertable'][$res[$i]['table']][$res[$i]['name']] = $i;
// free the result only if we were called on a table
* @param int $resource PostgreSQL result identifier
* @param int $num_field the field number
* @return string The flags of the field ('not_null', 'default_xx', 'primary_key',
* 'unique' and 'multiple_key' are supported)
function _pgFieldFlags ($resource, $num_field, $table_name)
$field_name = @pg_fieldname ($resource, $num_field);
$result = pg_exec ($this->connection, " SELECT f.attnotnull, f.atthasdef
FROM pg_attribute f, pg_class tab, pg_type typ
WHERE tab.relname = typ.typname
AND typ.typrelid = f.attrelid
AND f.attname = '$field_name'
AND tab.relname = '$table_name'" );
if (@pg_numrows ($result) > 0 ) {
$row = @pg_fetch_row ($result, 0 );
$flags = ($row[0 ] == 't') ? 'not_null ' : '';
$result = @pg_exec ($this->connection, " SELECT a.adsrc
FROM pg_attribute f, pg_class tab, pg_type typ, pg_attrdef a
WHERE tab.relname = typ.typname AND typ.typrelid = f.attrelid
AND f.attrelid = a.adrelid AND f.attname = '$field_name'
AND tab.relname = '$table_name'" );
$row = @pg_fetch_row ($result, 0 );
$flags .= " default_$num ";
$result = @pg_exec ($this->connection, " SELECT i.indisunique, i.indisprimary, i.indkey
FROM pg_attribute f, pg_class tab, pg_type typ, pg_index i
WHERE tab.relname = typ.typname
AND typ.typrelid = f.attrelid
AND f.attrelid = i.indrelid
AND f.attname = '$field_name'
AND tab.relname = '$table_name'" );
$count = @pg_numrows ($result);
for ($i = 0; $i < $count ; $i++ ) {
$row = @pg_fetch_row ($result, $i);
$flags .= ($row[0 ] == 't') ? 'unique ' : '';
$flags .= ($row[1 ] == 't') ? 'primary ' : '';
$flags .= 'multiple_key ';
Documentation generated on Mon, 11 Mar 2019 10:15:31 -0400 by phpDocumentor 1.4.4. PEAR Logo Copyright © PHP Group 2004.
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