widgets/data_list/PEARSQLDataListSource.inc

<?php

/**
 * This file contains the SQLDataListSource child class
 * that uses the PEAR DB object to talk to the DB.
 *
 * @author Walter A. Boring IV <waboring@buildabetterweb.com>
 * @package phpHtmlLib
 */

/**
 * This requires the SQLDataListSource
 * parent class
 *
 */
include_once($phphtmllib."/widgets/data_list/SQLDataListSource.inc");

/**
 * Have to have PEAR and DB included
 * the pear dir must be in the 
 * include path.
 */
require_once("PEAR.php");
require_once("DB.php");

/**
 * This SQLDataListSource child class interacts with
 * with the specific DB via the php PEAR DB abstraction
 * objects.
 *
 * How to use?
 * in the DataList child's get_data_source() method
 * you pass in the already connected PEAR DB object
 * in to the constructor.  PEARSQLDataListSource 
 * takes care of the rest.
 *
 * @author Walter A. Boring IV <waboring@buildabetterweb.com>
 * @package phpHtmlLib
 */
class PEARSQLDataListSource extends SQLDataListSource {

        /**
         * This var holds the Database object
         * that is used to do the sql queries
         * It is assumed that the db is already
         * connected to, and the object provides
         * 2 methods:
         * query() - execute a sql query
         */
        var $_db = NULL;

        /**
         * this holds the query result from the
         * PEAR::DB->query() call
         *
         */
        var $_result = NULL;


        /**
         * The constructor is used to pass in the
         * PEAR DB object that has already been
         * created and connected to the db.
         *
         * @param PEAR::DB object - MUST BE CONNECTED
         */
        function PEARSQLDataListSource( &$db ) {
                $this->set_db_object( $db );
        }
        
        /**
     * Set the DB object we will use
     * to talk to the DB.
     *
     * @param   object - $db the babw_db object.
     *
     */
    function set_db_object( &$db ) {
        $this->_db = &$db;
    }

        function do_query() {
                $this->_result = $this->_db->query($this->_query);
                if (DB::isError($this->_result)) {
                        $msg = $this->_result->getMessage();
                        user_error("PEARSQLDataListSource::do_query() - query failed : ".$msg);
                }
        }

        
        /**
         * This function gets the next data row
         * from the query()
         *
         * @return array()
         */
        function get_next_data_row() {
                return $this->_result->fetchRow(DB_FETCHMODE_ASSOC);
        }

        /**
     * This function builds the limit
     * clause portion of a DB query.
     *
     * @return string - the limit portion of 
     *                  the query.
     */
    function build_limit_clause($offset, $limit) {
        if ($this->get_limit() != -1 ) {
                        if ($offset == '' || $offset == "none") {
                                $offset = 0;
                        }
                        switch(get_class($this->_db)) {
                        case "db_mysql":
                                $clause = " LIMIT $offset, $limit ";
                                break;
                        case "db_pgsql":
                                $clause = " LIMIT $limit, $offset ";
                                break;
                        default:
                                $clause = " LIMIT $offset, $limit ";
                                break;
                        }
            return $clause;
        } else {
            return NULL;
        }
    }
    
    /**
     * find the number of rows to be returned 
     * from a query from a table and where clause
     *
     * @param string $table - the table to count from
     * @param string $where_clause - a where clause
     *
     * @return int the # of rows
     */
    function count($tables, $where_clause='', $count_clause='*') {
                $query = "select count(".$count_clause.") as COUNT from ".$tables." ".$where_clause;
        $result = $this->_db->query($query);
                if (DB::isError($this->_result)) {
                        $msg = $result->getMessage();
                        user_error("PEARSQLDataListSource::count() - query failed : ".$msg);
                }
                $value = $result->fetchRow(DB_FETCHMODE_ASSOC);
        return ($value ? (int)$value["COUNT"] : NULL);
    }
    
}

?>
1	jonen	1.1	<?php
2
3			/**
4			* This file contains the SQLDataListSource child class
5			* that uses the PEAR DB object to talk to the DB.
6			*
7			* @author Walter A. Boring IV <waboring@buildabetterweb.com>
8			* @package phpHtmlLib
9			*/
10
11			/**
12			* This requires the SQLDataListSource
13			* parent class
14			*
15			*/
16			include_once($phphtmllib."/widgets/data_list/SQLDataListSource.inc");
17
18			/**
19			* Have to have PEAR and DB included
20			* the pear dir must be in the
21			* include path.
22			*/
23			require_once("PEAR.php");
24			require_once("DB.php");
25
26			/**
27			* This SQLDataListSource child class interacts with
28			* with the specific DB via the php PEAR DB abstraction
29			* objects.
30			*
31			* How to use?
32			* in the DataList child's get_data_source() method
33			* you pass in the already connected PEAR DB object
34			* in to the constructor. PEARSQLDataListSource
35			* takes care of the rest.
36			*
37	jonen	1.2	* @author Walter A. Boring IV <waboring@buildabetterweb.com>
38			* @package phpHtmlLib
39	jonen	1.1	*/
40			class PEARSQLDataListSource extends SQLDataListSource {
41
42			/**
43			* This var holds the Database object
44			* that is used to do the sql queries
45			* It is assumed that the db is already
46			* connected to, and the object provides
47			* 2 methods:
48			* query() - execute a sql query
49			*/
50			var $_db = NULL;
51
52			/**
53			* this holds the query result from the
54			* PEAR::DB->query() call
55			*
56			*/
57			var $_result = NULL;
58
59
60			/**
61			* The constructor is used to pass in the
62			* PEAR DB object that has already been
63			* created and connected to the db.
64			*
65			* @param PEAR::DB object - MUST BE CONNECTED
66			*/
67			function PEARSQLDataListSource( &$db ) {
68			$this->set_db_object( $db );
69			}
70
71			/**
72			* Set the DB object we will use
73			* to talk to the DB.
74			*
75			* @param object - $db the babw_db object.
76			*
77			*/
78			function set_db_object( &$db ) {
79			$this->_db = &$db;
80			}
81
82			function do_query() {
83			$this->_result = $this->_db->query($this->_query);
84			if (DB::isError($this->_result)) {
85			$msg = $this->_result->getMessage();
86			user_error("PEARSQLDataListSource::do_query() - query failed : ".$msg);
87			}
88			}
89
90
91
92			/**
93			* This function gets the next data row
94			* from the query()
95			*
96			* @return array()
97			*/
98			function get_next_data_row() {
99			return $this->_result->fetchRow(DB_FETCHMODE_ASSOC);
100			}
101
102			/**
103			* This function builds the limit
104			* clause portion of a DB query.
105			*
106			* @return string - the limit portion of
107			* the query.
108			*/
109			function build_limit_clause($offset, $limit) {
110			if ($this->get_limit() != -1 ) {
111			if ($offset == '' \|\| $offset == "none") {
112			$offset = 0;
113			}
114			switch(get_class($this->_db)) {
115			case "db_mysql":
116			$clause = " LIMIT $offset, $limit ";
117			break;
118			case "db_pgsql":
119			$clause = " LIMIT $limit, $offset ";
120			break;
121			default:
122			$clause = " LIMIT $offset, $limit ";
123			break;
124			}
125			return $clause;
126			} else {
127			return NULL;
128			}
129			}
130
131			/**
132			* find the number of rows to be returned
133			* from a query from a table and where clause
134			*
135			* @param string $table - the table to count from
136			* @param string $where_clause - a where clause
137			*
138			* @return int the # of rows
139			*/
140			function count($tables, $where_clause='', $count_clause='*') {
141			$query = "select count(".$count_clause.") as COUNT from ".$tables." ".$where_clause;
142			$result = $this->_db->query($query);
143			if (DB::isError($this->_result)) {
144			$msg = $result->getMessage();
145			user_error("PEARSQLDataListSource::count() - query failed : ".$msg);
146			}
147			$value = $result->fetchRow(DB_FETCHMODE_ASSOC);
148			return ($value ? (int)$value["COUNT"] : NULL);
149			}
150
151			}
152
153			?>
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