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<?php
/**********************************************************************
* Author: Justin Vincent (jv@jvmultimedia.com)
* Web...: http://twitter.com/justinvincent
* Stefanie Janine Stoelting (mail@stefanie-stoelting.de)
* Name..: ezSQL_postgresql
* Desc..: PostgreSQL component (part of ezSQL databse abstraction library)
*
*/
/**********************************************************************
* ezSQL error strings - PostgreSQL
*/
global $ezsql_postgresql_str;
$ezsql_postgresql_str = array
(
1 => 'Require $dbuser and $dbpassword to connect to a database server',
2 => 'Error establishing PostgreSQL database connection. Correct user/password? Correct hostname? Database server running?',
3 => 'Require $dbname to select a database',
4 => 'mySQL database connection is not active',
5 => 'Unexpected error while trying to select database'
);
/**********************************************************************
* ezSQL Database specific class - PostgreSQL
*/
if ( ! function_exists ('pg_connect') ) die('<b>Fatal Error:</b> ezSQL_postgresql requires PostgreSQL Lib to be compiled and or linked in to the PHP engine');
if ( ! class_exists ('ezSQLcore') ) die('<b>Fatal Error:</b> ezSQL_postgresql requires ezSQLcore (ez_sql_core.php) to be included/loaded before it can be used');
class ezSQL_postgresql extends ezSQLcore
{
var $dbuser = false;
var $dbpassword = false;
var $dbname = false;
var $dbhost = false;
var $rows_affected = false;
/**********************************************************************
* Constructor - allow the user to perform a quick connect at the
* same time as initialising the ezSQL_postgresql class
*/
function __construct($dbuser='', $dbpassword='', $dbname='', $dbhost='localhost', $port='5432')
{
$this->dbuser = $dbuser;
$this->dbpassword = $dbpassword;
$this->dbname = $dbname;
$this->dbhost = $dbhost;
$this->port = $port;
}
/**********************************************************************
* In the case of PostgreSQL quick_connect is not really needed
* because std. connect already does what quick connect does -
* but for the sake of consistency it has been included
*/
function quick_connect($dbuser='', $dbpassword='', $dbname='', $dbhost='localhost', $port='5432')
{
$return_val = false;
if ( ! $this->connect($dbuser, $dbpassword, $dbname, $dbhost, $port) ) ;
else if ( ! $this->select($dbname) ) ;
else $return_val = true;
return $return_val;
}
/**********************************************************************
* Try to connect to mySQL database server
*/
function connect($dbuser='', $dbpassword='', $dbname='', $dbhost='localhost', $port='5432')
{
global $ezsql_postgresql_str; $return_val = false;
// Must have a user and a password
if ( ! $dbuser )
{
$this->register_error($ezsql_postgresql_str[1].' in '.__FILE__.' on line '.__LINE__);
$this->show_errors ? trigger_error($ezsql_postgresql_str[1],E_USER_WARNING) : null;
}
// Try to establish the server database handle
else if ( ! $this->dbh = @pg_connect("host=$dbhost port=$port dbname=$dbname user=$dbuser password=$dbpassword", true) )
{
$this->register_error($ezsql_postgresql_str[2].' in '.__FILE__.' on line '.__LINE__);
$this->show_errors ? trigger_error($ezsql_postgresql_str[2],E_USER_WARNING) : null;
}
else
{
$this->dbuser = $dbuser;
$this->dbpassword = $dbpassword;
$this->dbhost = $dbhost;
$this->dbname = $dbname;
$this->port = $port;
$return_val = true;
$this->conn_queries = 0;
}
return $return_val;
}
/**********************************************************************
* No real equivalent of mySQL select in PostgreSQL
* once again, function included for the sake of consistency
*/
function select($dbuser='', $dbpassword='', $dbname='', $dbhost='localhost', $port='5432')
{
$return_val = false;
if ( ! $this->connect($dbuser, $dbpassword, $dbname, $dbhost,true) ) ;
else if ( ! $this->select($dbname) ) ;
else $return_val = true;
return $return_val;
}
/**********************************************************************
* Format a mySQL string correctly for safe mySQL insert
* (no mater if magic quotes are on or not)
*/
function escape($str)
{
return pg_escape_string(stripslashes($str));
}
/**********************************************************************
* Return PostgreSQL specific system date syntax
* i.e. Oracle: SYSDATE Mysql: NOW()
*/
function sysdate()
{
return 'NOW()';
}
/**********************************************************************
* Return PostgreSQL specific values
*/
function showTables()
{
return "table_name FROM information_schema.tables WHERE table_schema = '$this->dbname' and table_type='BASE TABLE'";
}
function descTable($tbl_name)
{
return "ordinal_position, column_name, data_type, column_default, is_nullable, character_maximum_length, numeric_precision FROM information_schema.columns WHERE table_name = '$tbl_name' AND table_schema='$this->dbname' ORDER BY ordinal_position";
}
function showDatabases()
{
return "datname from pg_database WHERE datname NOT IN ('template0', 'template1') ORDER BY 1";
}
/**********************************************************************
* Perform PostgreSQL query and try to detirmin result value
*/
function query($query)
{
// Initialise return
$return_val = 0;
// Flush cached values..
$this->flush();
// For reg expressions
$query = trim($query);
// Log how the function was called
$this->func_call = "\$db->query(\"$query\")";
// Keep track of the last query for debug..
$this->last_query = $query;
// Count how many queries there have been
$this->count(true, true);
// Use core file cache function
if ( $cache = $this->get_cache($query) )
{
return $cache;
}
// If there is no existing database connection then try to connect
if ( ! isset($this->dbh) || ! $this->dbh )
{
$this->connect($this->dbuser, $this->dbpassword, $this->dbname, $this->dbhost, $this->port);
}
// Perform the query via std postgresql_query function..
$this->result = @pg_query($this->dbh, $query);
// If there is an error then take note of it..
if ( $str = @pg_last_error($this->dbh) )
{
$this->register_error($str);
$this->show_errors ? trigger_error($str,E_USER_WARNING) : null;
return false;
}
// Query was an insert, delete, update, replace
$is_insert = false;
if ( preg_match("/^(insert|delete|update|replace)\s+/i",$query) )
{
$is_insert = true;
$this->rows_affected = @pg_affected_rows($this->result);
// Take note of the insert_id
if ( preg_match("/^(insert|replace)\s+/i",$query) )
{
//$this->insert_id = @postgresql_insert_id($this->dbh);
//$this->insert_id = pg_last_oid($this->result);
// Thx. Rafael Bernal
$insert_query = pg_query("SELECT lastval();");
$insert_row = pg_fetch_row($insert_query);
$this->insert_id = $insert_row[0];
}
// Return number fo rows affected
$return_val = $this->rows_affected;
}
// Query was a select
else
{ $num_rows=0;
//if ( $this->result ) //may be needed but my tests did not
//{
// =======================================================
// Take note of column info
$i=0;
while ($i < @pg_num_fields($this->result))
{
$this->col_info[$i]->name = pg_field_name($this->result,$i);
$this->col_info[$i]->type = pg_field_type($this->result,$i);
$this->col_info[$i]->size = pg_field_size($this->result,$i);
$i++;
}
// =======================================================
// Store Query Results
//while ( $row = @pg_fetch_object($this->result, $i, PGSQL_ASSOC) ) doesn't work? donno
//while ( $row = @pg_fetch_object($this->result,$num_rows) ) does work
while ( $row = @pg_fetch_object($this->result) )
{
// Store results as an objects within main array
$this->last_result[$num_rows] = $row ;
$num_rows++;
}
@pg_free_result($this->result);
//}
// Log number of rows the query returned
$this->num_rows = $num_rows;
// Return number of rows selected
$return_val = $this->num_rows;
}
// disk caching of queries
$this->store_cache($query,$is_insert);
// If debug ALL queries
$this->trace || $this->debug_all ? $this->debug() : null ;
return $return_val;
}
/**
* Close the database connection
*/
function disconnect()
{
if ( $this->dbh )
{
$this->conn_queries = 0;
@pg_close($this->dbh);
}
}
}
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