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.
 *
 */
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			*/
38			class PEARSQLDataListSource extends SQLDataListSource {
39
40			/**
41			* This var holds the Database object
42			* that is used to do the sql queries
43			* It is assumed that the db is already
44			* connected to, and the object provides
45			* 2 methods:
46			* query() - execute a sql query
47			*/
48			var $_db = NULL;
49
50			/**
51			* this holds the query result from the
52			* PEAR::DB->query() call
53			*
54			*/
55			var $_result = NULL;
56
57
58			/**
59			* The constructor is used to pass in the
60			* PEAR DB object that has already been
61			* created and connected to the db.
62			*
63			* @param PEAR::DB object - MUST BE CONNECTED
64			*/
65			function PEARSQLDataListSource( &$db ) {
66			$this->set_db_object( $db );
67			}
68
69			/**
70			* Set the DB object we will use
71			* to talk to the DB.
72			*
73			* @param object - $db the babw_db object.
74			*
75			*/
76			function set_db_object( &$db ) {
77			$this->_db = &$db;
78			}
79
80			function do_query() {
81			$this->_result = $this->_db->query($this->_query);
82			if (DB::isError($this->_result)) {
83			$msg = $this->_result->getMessage();
84			user_error("PEARSQLDataListSource::do_query() - query failed : ".$msg);
85			}
86			}
87
88
89
90			/**
91			* This function gets the next data row
92			* from the query()
93			*
94			* @return array()
95			*/
96			function get_next_data_row() {
97			return $this->_result->fetchRow(DB_FETCHMODE_ASSOC);
98			}
99
100			/**
101			* This function builds the limit
102			* clause portion of a DB query.
103			*
104			* @return string - the limit portion of
105			* the query.
106			*/
107			function build_limit_clause($offset, $limit) {
108			if ($this->get_limit() != -1 ) {
109			if ($offset == '' \|\| $offset == "none") {
110			$offset = 0;
111			}
112			switch(get_class($this->_db)) {
113			case "db_mysql":
114			$clause = " LIMIT $offset, $limit ";
115			break;
116			case "db_pgsql":
117			$clause = " LIMIT $limit, $offset ";
118			break;
119			default:
120			$clause = " LIMIT $offset, $limit ";
121			break;
122			}
123			return $clause;
124			} else {
125			return NULL;
126			}
127			}
128
129			/**
130			* find the number of rows to be returned
131			* from a query from a table and where clause
132			*
133			* @param string $table - the table to count from
134			* @param string $where_clause - a where clause
135			*
136			* @return int the # of rows
137			*/
138			function count($tables, $where_clause='', $count_clause='*') {
139			$query = "select count(".$count_clause.") as COUNT from ".$tables." ".$where_clause;
140			$result = $this->_db->query($query);
141			if (DB::isError($this->_result)) {
142			$msg = $result->getMessage();
143			user_error("PEARSQLDataListSource::count() - query failed : ".$msg);
144			}
145			$value = $result->fetchRow(DB_FETCHMODE_ASSOC);
146			return ($value ? (int)$value["COUNT"] : NULL);
147			}
148
149			}
150
151			?>
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