Question

Using PEAR:MDB2, how to create a generic function with autoExecute?

Asked by: kkarumu

I'm trying to make a generic function to run queries with Pear MDB2, (autoExecute)

The two functions belowe works, the sql would is SELECT ... FROM ... WHERE settings_active = foo AND settings_level = bar,

Is it possible to use the select function to make use of  more statements in the where part of the sql query? for example use of OR, GREATER etc.?

function select( $table_name, $result_types, $where ){
       
        global $dbprefix;
       
        $table_name = $dbprefix . $table_name;
       
        $this->mdb2->loadModule('Extended');
       
        $result = $this->mdb2->extended->autoExecute(    
                                           $table_name,
                                           null,
                                           MDB2_AUTOQUERY_SELECT,
                                           $where,
                                           null,
                                           true,
                                           $result_types
        );
                                               
        if (PEAR::isError($result)) {
            die($result->getMessage());
        }
       
        return $result;
    }
   
    function getAllSettingsSQL(){
   
        $table_name = "settings";
   
        $result_types = array (
                            'settings_ID' => 'integer',
                            'settings_name' => 'text',
                            'settings_desc' => 'text',
                            'settings_active' => 'text',
                            'settings_value' => 'text',
                            'settings_level' => 'integer'
        );
                               
        $where = array(    
                    'settings_active' => $this->mdb2->quote('1', 'text'),
                    'settings_level'  => $this->mdb2->quote(3, 'integer'),
        );
       
        $result = $this->select($table_name, $result_types, $where);
       
        $data = array();        
       
        while($row = $result->fetchRow()){
            echo "<p>". $row['settings_name'] . " - ". $row['settings_value'] ."</p>";
        }
    }

Or do I have to alter the select function to take a sql query as parameter and use standard prepare and execute.

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Asked On
2007-02-19 at 13:58:41ID22399646
Tags

mdb2

,

autoexecute

,

pear

Topic

PHP Scripting Language

Participating Experts
1
Points
500
Comments
7

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Answers

 

by: German_RummPosted on 2007-02-28 at 09:22:12ID: 18626868

As far as I know, $where argument for autoExecute() should be a string.

So you should basically compose your own $where string and pass it to autoExecute().

Example:

$where = '(Age BETWEEN 18 AND 25) OR Height > 160';

$this->select($table_name, $result_types, $where);

 

by: kkarumuPosted on 2007-03-02 at 08:43:47ID: 18642200

thanks for your reply,

Would it be possible to execute a query like this?

SELECT DISTINCT t.vers_ID, v.vers_name
FROM terms t, versions v
WHERE t.comp_ID =1
AND t.div_ID =1
AND t.terms_year ='2006'
AND t.survey_ID =4
AND t.vers_ID = v.vers_ID

 

by: kkarumuPosted on 2007-03-02 at 10:21:15ID: 18643022

What I'm trying to do is creating a general query function that takes some values and does the need operation. It doesn't have to use autoExecute(), I just thought that would be the simplest, since it already have some functions to create the sql based on given values,

my function looks like this now:

/**
    * Method Query to autoExecute SQL select, insert, update and delete statements
    * Parameters:
    *
    * string   $file                —    Name of the file calling this method
    *
    * string   $line                —    The line this method is called from
    *
    * string   $table                 —        name of the table
    *
    * array    $fields_values         —        assoc ($key=>$value) where $key
    *                                    is a field name and $value its value
    *
    * string   $action                 —        type of query to build
    *                                    insert
    *                                    update
    *                                    delete
    *                                    select
    *
    * string   $where                 —        (in case of update and delete queries,
    *                                    this string will be put after the sql
    *                                    WHERE statement)
    *
    * array    $types                 —        that contains the types of the
    *                                    placeholders
    *    
    * string   $result_class             —        which specifies which result
    *                                    class to use
    *    
    * mixed    $result_types             —        array that contains the types of the
    *                                    columns in the result set or
    *                                    MDB2_PREPARE_RESULT, if set to
    *                                    MDB2_PREPARE_MANIP the query is
    *                                    handled as a manipulation query
    */

    function query( $file, $line, $table_name, $fields_value, $action,
                    $where, $types, $result_class, $result_types ){
   
   
        // Add prefix to table name                
        $table_name = $this->getTablename($table_name);
       
        // Load the extended module
        $this->mdb2->loadModule('Extended');
       
        switch ( strtolower($action) ){
            case "select":
                $do_action = MDB2_AUTOQUERY_SELECT;
                break;
               
            case "insert":
                $do_action = MDB2_AUTOQUERY_INSERT;
                break;
               
            case "update":
                $do_action = MDB2_AUTOQUERY_UPDATE;
                break;
               
            case "delete":
                $do_action = MDB2_AUTOQUERY_DELETE;
                break;
            default;
                die('Unknown mysql operation: ' . $action . ' in ' . $file . ' on line ' . $line );
                break;      
        }
               
        $result = $this->mdb2->extended->autoExecute(    
                                           $table_name,
                                           $fields_value,
                                           $do_action,
                                           $where,
                                           $types,
                                           $result_class,
                                           $result_types
        );
                                               
        if (PEAR::isError($result)) {
            die( $result->getMessage() );
        }
       
        return $result;
    }

the parms this function takes is just the same as for the autoExecute, and I have added to more params,  maybe this function takes to many params, and just complicates it all?

I'm thinking of making another query function to take an sql sentence as well (for more advanced queries, including subselect etc), maybe that's the solution for me?

 

by: German_RummPosted on 2007-03-04 at 15:35:48ID: 18651605

Function you wrote is basically a wrapper for MDB2's autoExecute().

It really doesn't add any functionality, and actually makes querying a database much more complicated, since it doesn't use default arguments.

What are you planning to use it for?

 

by: kkarumuPosted on 2007-03-05 at 04:15:52ID: 18653783

Hi,

Thanks for your comment!

I'm developing a online surveysystem with PHP, MySQL and Ajax with two others. There are several modules: report, calculation.

What I'm trying to do is to make a thick database layer and have a single API to it. Trying to make a easy way to make use of that class, but so far I feel as you pointed out that things are getting more complicated.

The goal is to have a db class that have one public method that all of the parts of the system uses to get data from the db.

Sofar we have a abstract dbConnection class, a general class that extends the first, and there I'm stuck.
I possiblity I'm thinking of is that all of the modules extend the general class, and add's it's own methods, but then there would me many db objects? But maybe thats a better solution?

Maybe it's a waste of time to create a general method that can handle everything? Since there's alot of different possebilities when it comes to SQL. Would it be better to create a smaller methods like dbCount, dbAvg, dbGetOne, dbGetAll, dbDistinct etc? Then ther's join, subselects etc, for those I probably have to create a method that takes the SQL statement as a parm and prepares and executes it.

Here's what i made yesterday, a select method.. It turned out to be very very messy..

function select($table_name, $fields='', $action='', $where='', $data='', $group='', $order='', $subselect=''){

        // Load the extended module
        $this->mdb2->loadModule('Extended');
             
        // Add prefix to table name                
        $table_name = $this->getTablename($table_name);

        //var to hold the fields to be selected
        $what = '';
       
        // is the fields to be selected an array, if true, create a quoted
        //    string separeted by comma,
        if(is_array($fields)){
            $i = 1;
            foreach($fields as $key){
                $what .= $this->mdb2->quoteidentifier($key);
               
                if($i <  count($fields) )
                    $what .= ', ';
                   
                $i++;
            }
           
       }else
            $what = '';                

        $as  = '';
        $doAction = '';

        if(is_array($action)){
            $doAction = strtoupper($action['action']);

            if($action['as'] != '')
                $as = $action['as'];
            else
                $as = $action['action'];
               
            if($action['field'] != '')
                $doField = $this->mdb2->quoteIdentifier($action['field']);
           
            else
                $doField = ' * ';
       
        }else{
            $doAction = strtoupper($action);
            $as = $action;
        }

        if($doAction != '')
            $add = $doAction . ' (' . $doField .  ') AS ' . $this->mdb2->quote($as);
        else
            $add = '';
       
        if($group != '')
            $group = ' GROUP BY ' . $this->mdb2->quoteIdentifier($group) . ' ';
         
           
        if($what == '' && $add == '')
            $what = ' * ';
       
        else if($what != '' && $add != '')
            $add .= ', ';
           
        $sql = 'SELECT ' . $add . ' '
                         . $what . ' FROM '
                         . $this->mdb2->quoteIdentifier($table_name) . ' '
                         . $where . ' '
                         . $order . ' '
                         . $group;        
                         
        echo "<pre>";
        print_r ($sql);
        echo "</pre>";                
       
        if($data == ''){
            if($result = $this->mdb2->queryAll($sql))
                 if (PEAR::isError($result)) {
                    die( $result->getMessage() . '<br />' . $result->getDebugInfo());
                }
               
                return $result;
        }else{
            $sth = $this->mdb2->prepare($sql);
            //$result = $sth->execute($data);
        }              
       
       
        if (PEAR::isError($result)) {
            die( $result->getMessage() . '<br />' . $mdb2->getDebugInfo() );
        }
       
        return $result->fetchAll();
    }

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