Radicore Forum: How To » Check for empty $schema in dml.psql.class.inc

Home » RADICORE » How To » Check for empty $schema in dml.psql.class.inc

Show: Today's Messages :: Polls :: Message Navigator
E-mail to friend

Check for empty $schema in dml.psql.class.inc [message #7250]

Wed, 06 February 2019 12:42

pdv
Messages: 15
Registered: January 2019

Junior Member

Hi,

I'm new and trying to access some existing PostgreSQL databases with Radicore and on macos. Sofar I met a few problems which I could only solve by changing the code. I'll describe them in separate messages.

The first problem is similar to the one reported in the thread "SQLSRV Driver", message #4722. I could only connect to the database when hard coding the dbname (which is the postgresql schema).

The problem is in the following code in dml.pgsql.class.inc:

if (!empty($this->dbname) AND !empty($schema)) {
$result = $this->connect($schema) or trigger_error($this, E_USER_ERROR);
} else {
trigger_error('No value supplied for PGSQL_dbname', E_USER_ERROR);
} // if

This code fails because $schema is empty, e.g. when querying for the list of databases. $this->dbname refers here to the PGSQL_dbname. I removed the check on $schema.
The error message is also misleading in this case since PGSQL_dbname was not empty.

Regards,

Patrick

Report message to a moderator

Re: Check for empty $schema in dml.psql.class.inc [message #7254 is a reply to message #7250]

Thu, 07 February 2019 04:49

AJM
Messages: 2363
Registered: April 2006
Location: Surrey, UK

Senior Member

PostgreSQL is peculiar because it has the hierarchy server->database->schema->table instead of server->database->table. When the framework code connects to a server it is possible to change the default database (or "schema" in postgres) to whatever you choose, or even to construct a query which accesses tables in more than one database (or "schema" in postgres). For this reason when using postgres the "database" name *MUST* be hard coded in the config file, and it is only the "schema" name which is dynamic. Please refer to http://www.tonymarston.net/php-mysql/postgresql.html#databas e.connection for details.

Tony Marston
http://www.tonymarston.net
http://www.radicore.org

Report message to a moderator

Re: Check for empty $schema in dml.psql.class.inc [message #7258 is a reply to message #7254]

Thu, 07 February 2019 07:15

pdv
Messages: 15
Registered: January 2019

Junior Member

Tony,

I realize the differences between MySQL and PostgreSQL, but it remains confusing.
I want to access existing postgresql-dbs and I had 2 options: install radicore in each of them in a separate schema, like this:

db1
---schema-radicore
------menu
------dict
....
---schema1
------table11
------table12
---....

db2
---schema-radicore
---.....

Or to install radicore in a separate pgsql-database, which I prefer:

db-radicore
---schema-public
------menu
------dict
....
db1
---schema1
------table11
------table12
...
db2
---schema2
------table21
------table22
---.....

This means I need at least 2 connections, one for a particular db and one for radicore.
This is my config.inc to access a pgsql-database bxtests with schema public (which I renamed to bxtests):

if (preg_match('/^(127.0.0.1|localhost|desktop|laptop)$/i', $_SERVER['SERVER_NAME'])) {
global $servers;
// server 0
$servers[0]['dbhost'] = 'localhost';
$servers[0]['dbengine'] = 'pgsql';
$servers[0]['dbusername'] = 'user1';
$servers[0]['dbuserpass'] = 'password1';
$servers[0]['dbport'] = '';
$servers[0]['dbsocket'] = '';
$servers[0]['dbprefix'] = '';
$servers[0]['dbnames'] = 'bxtests';
$servers[0]['PGSQL_dbname'] = 'bxtests';
$servers[0]['switch_dbnames'] = array('bxtests' => 'public'); // the PostgreSQL schema is 'public'
$servers[0]['ssl_key'] = '';
$servers[0]['ssl_cert'] = '';
$servers[0]['ssl_ca'] = '';
$servers[0]['ssl_capath'] = '';
$servers[0]['ssl_cipher'] = '';
// server 1
$servers[1]['dbhost'] = 'localhost';
$servers[1]['dbengine'] = 'pgsql';
$servers[1]['dbusername'] = 'user2';
$servers[1]['dbuserpass'] = 'password2';
$servers[1]['dbport'] = '';
$servers[1]['dbsocket'] = '';
$servers[1]['dbprefix'] = '';
$servers[1]['PGSQL_dbname'] = 'radicore';
$servers[1]['dbnames'] = '*';
} // if

With this server-configuration, when importing databases (schemas) I found that $schema was empty; I have not been able to clarify this, since I had not yet installed XDebug. I'll look at this again.

Regards,

Patrick

Report message to a moderator

Re: Check for empty $schema in dml.psql.class.inc [message #7265 is a reply to message #7258]

Fri, 08 February 2019 05:11

AJM
Messages: 2363
Registered: April 2006
Location: Surrey, UK

Senior Member

If you could find out by using your debugger what is going wrong then that would be a great help.

Tony Marston
http://www.tonymarston.net
http://www.radicore.org

Report message to a moderator

Re: Check for empty $schema in dml.psql.class.inc [message #7269 is a reply to message #7265]

Sun, 10 February 2019 11:16

pdv
Messages: 15
Registered: January 2019

Junior Member

Unfortunately I cannot reproduce the problem without first removing my test-database (bxtests): I have reactivated the check for !empty($schema) and there is no more problem. But I notice that &_getDBMSengineByHost() is not called anymore, just &_getDBMSengine() and that might explain the difference.

The problem occurred when I tried to import my bxtests database for the very first time, using the 2-server configuration I've send previously.

Luckily I kept the relevant error-message which shows that __construct is called with an empty $dbname. And indeed I don't see right away where in &_getDBMSengineByHost(), $args['dbname'] has been set before calling the constructor.

2019-01-26 21:59:33
Fatal Error: No value supplied for PGSQL_dbname (# 256)
Error in line 93 of file '/Library/WebServer/Documents/radicore/includes/dml.pgsql.cl ass.inc'.
PHP_SELF: /radicore/dict/database(add1)import.php
CURRENT DIRECTORY: /Library/WebServer/Documents/radicore/dict
SERVER_ADDR: ::1
SERVER_NAME: localhost
HTTP_HOST: localhost
User Id: MGR
Role Id: GLOBAL
REMOTE_ADDR: ::1
REQUEST_URI: /radicore/dict/database(add1)import.php?csrf_id=5c4cd84538cc 89.99819281&session_name=menu1

Page Stack:

[0] main_menu
[1] dictionary
[2] dict_database(list1)
[3] dict_database(add1)import

Backtrace:
0: array =
function: string = errorHandler
args: array =
0: integer = 256
1: string = No value supplied for PGSQL_dbname
2: string = /Library/WebServer/Documents/radicore/includes/dml.pgsql.cla ss.inc
3: integer = 93
4: array =
args: array =
dbhost: string = localhost
dbusername: string = theusername1
dbuserpass: string = thepassword1
dbprefix: string =
PGSQL_dbname: string = bxtests
dbname: string = null
dbport: string = null
dbsocket: string = null
schema: string = null
1: array =
file: string = /Library/WebServer/Documents/radicore/includes/dml.pgsql.cla ss.inc
line: integer = 93
function: string = trigger_error
args: array =
0: string = No value supplied for PGSQL_dbname
1: integer = 256
2: array =
file: string = /Library/WebServer/Documents/radicore/includes/std.singleton .php5.inc
line: integer = 131
function: string = __construct
class: string = pgsql
type: string = ->
args: array =
0: array =
dbhost: string = localhost
dbusername: string = theusername1
dbuserpass: string = thepassword1
dbprefix: string =
PGSQL_dbname: string = bxtests
dbname: string = null
dbport: string = null
dbsocket: string = null
3: array =
file: string = /Library/WebServer/Documents/radicore/dict/classes/dict_data base_s01.class.inc
line: integer = 336
function: string = getInstance
class: string = RDCsingleton
type: string = ::
args: array =
0: string = pgsql
1: array =
dbhost: string = localhost
dbusername: string = theusername1
dbuserpass: string = thepassword1
dbprefix: string =
PGSQL_dbname: string = bxtests
2: boolean = 1
4: array =
file: string = /Library/WebServer/Documents/radicore/dict/classes/dict_data base_s01.class.inc
line: integer = 166
function: string = _getDBMSengineByHost
class: string = dict_dataBase_s01
type: string = ->
args: array =
0: string = localhost
5: array =
file: string = /Library/WebServer/Documents/radicore/dict/classes/dict_data base_s01.class.inc
line: integer = 90
function: string = _loadDatabases
class: string = dict_dataBase_s01
type: string = ->
args: array =
0: string = localhost
1: array =
2: string =
3: array =
4: array =
public: string = bxtests
6: array =
file: string = /Library/WebServer/Documents/radicore/includes/std.table.cla ss.inc
line: integer = 3276
function: string = _cm_getInitialData
class: string = dict_dataBase_s01
type: string = ->
args: array =
0: array =
7: array =
file: string = /Library/WebServer/Documents/radicore/includes/std.add1.inc
line: integer = 60
function: string = getInitialData
class: string = Default_Table
type: string = ->
args: array =
0: string =
8: array =
file: string = /Library/WebServer/Documents/radicore/dict/database(add1)imp ort.php
line: integer = 9
args: array =
0: string = /Library/WebServer/Documents/radicore/includes/std.add1.inc
function: string = require_once

Report message to a moderator

Re: Check for empty $schema in dml.psql.class.inc [message #7270 is a reply to message #7269]

Mon, 11 February 2019 04:43

AJM
Messages: 2363
Registered: April 2006
Location: Surrey, UK

Senior Member

I have examined the amended code for dict_database_s01.class.inc which you sent me, and it actually contains a bug. The first argument in the _loadDatabases() method you changed from $dbhost to $server, yet the first line of the method is still referring to $dbhost. As it has not been defined the first condition always fails.

Tony Marston
http://www.tonymarston.net
http://www.radicore.org

Report message to a moderator

Re: Check for empty $schema in dml.psql.class.inc [message #7272 is a reply to message #7270]

Tue, 12 February 2019 04:44

pdv
Messages: 15
Registered: January 2019

Junior Member

Yes, of course, that explains why the problem with the missing $schema went away.
I've replaced $dbhost by $server in the check and corrected another bug (see enclosed patch) and now the behaviour is as before: when importing databases, _loadDatabases() is called and eventually the constructor of dml.pgsql.class.inc is called with an empty $args['dbname'].

In _getDBMSEngineByServer (previously _getDBMSEngineByHost) $dbname_array and $switch_dbnames are present but not passed.
But no dbname (or schema) is actually needed in this case.

Attachment: patch0002a.diff
(Size: 8.92KB, Downloaded 624 times)

Report message to a moderator

Re: Check for empty $schema in dml.psql.class.inc [message #7273 is a reply to message #7272]

Wed, 13 February 2019 04:19

AJM
Messages: 2363
Registered: April 2006
Location: Surrey, UK

Senior Member

I cannot work with diff files, so can you send me the amended class file?

Tony Marston
http://www.tonymarston.net
http://www.radicore.org

Report message to a moderator

Re: Check for empty $schema in dml.psql.class.inc [message #7274 is a reply to message #7273]

Wed, 13 February 2019 04:44

pdv
Messages: 15
Registered: January 2019

Junior Member

Here it comes.

Attachment: dict_database_s01.class.inc
(Size: 13.77KB, Downloaded 658 times)

Report message to a moderator

Re: Check for empty $schema in dml.psql.class.inc [message #7275 is a reply to message #7274]

Thu, 21 February 2019 18:30

AJM
Messages: 2363
Registered: April 2006
Location: Surrey, UK

Senior Member

I have recreated the situation which causes this problem on my PC and stepped through it with my debugger. I have made some changes which are different from yours, but which fix the problem. See the attached zip file. Check it out and see if it works for you.