-
Notifications
You must be signed in to change notification settings - Fork 0
/
Park.php
160 lines (143 loc) · 4.02 KB
/
Park.php
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
<?php
/**
* A Class for interacting with the national_parks database table
*
* contains static methods for retrieving records from the database
* contains an instance method for persisting a record to the database
*
* Usage Examples
*
* Retrieve a list of parks and display some values for each record
*
* $parks = Park::all();
* foreach($parks as $park) {
* echo $park->id . PHP_EOL;
* echo $park->name . PHP_EOL;
* echo $park->description . PHP_EOL;
* echo $park->areaInAcres . PHP_EOL;
* }
*
* Inserting a new record into the database
*
* $park = new Park();
* $park->name = 'Acadia';
* $park->location = 'Maine';
* $park->areaInAcres = 48995.91;
* $park->dateEstablished = '1919-02-26';
*
* $park->insert();
*
*/
class Park {
///////////////////////////////////
// Static Methods and Properties //
///////////////////////////////////
/**
* our connection to the database
*/
public static $dbc = NULL;
/**
* establish a database connection if we do not have one
*/
public static function dbConnect()
{
if (!is_null(self::$dbc)) {
return;
}
self::$dbc = require 'db_connect.php';
}
/**
* returns the number of records in the database
*/
public static function count()
{
self::dbConnect();
$query = 'SELECT * FROM national_parks;';
return self::$dbc->query($query)->rowCount();
}
/**
* returns all the records
*/
public static function all()
{
self::dbConnect();
$query = 'SELECT * FROM national_parks;';
$parkTable = self::$dbc->query($query)->fetchAll(PDO::FETCH_ASSOC);
$parks = [];
foreach ($parkTable as $park) {
$parks[$park['id']] = new Park($park);
}
return $parks;
}
/**
* returns $resultsPerPage number of results for the given page number
*/
public static function paginate($pageNo = 1, $resultsPerPage = 4)
{
self::dbConnect();
$limit = $resultsPerPage;
$offset = ($pageNo - 1) * 4;
$query = "SELECT * FROM national_parks LIMIT $offset, $limit";
$parkTable = self::$dbc->query($query)->fetchAll(PDO::FETCH_ASSOC);
foreach ($parkTable as $park) {
$parks[$park['id']] = new Park($park);
}
return $parks;
}
public static function guessType($value)
{
switch (gettype($value)) {
case 'boolean':
return PDO::PARAM_BOOL;
case 'NULL':
return PDO::PARAM_NULL;
case 'integer':
return PDO::PARAM_INT;
case 'double':
case 'string':
return PDO::PARAM_STR;
}
}
/////////////////////////////////////
// Instance Methods and Properties //
/////////////////////////////////////
/**
* properties that represent columns from the database
*/
public $id;
public $name;
public $location;
public $date_established;
public $area_in_acres;
public $description;
public function __construct($park = NULL)
{
self::dbConnect();
if (is_null($park)) return;
$this->id = isset($park['id']) ? $park['id'] : NULL;
$this->name = $park['name'];
$this->location = $park['location'];
$this->date_established = $park['date_established'];
$this->area_in_acres = $park['area_in_acres'];
$this->description = isset($park['description']) ? $park['description'] : NULL;
}
/**
* inserts a record into the database
*/
public function insert()
{
if (empty($this->description)) $this->description = NULL;
$query = <<<SQL
INSERT INTO national_parks(name, location, date_established, area_in_acres, description)
VALUES (:name, :location, :date_established, :area_in_acres, :description);
SQL;
$stmt = self::$dbc->prepare($query);
$stmt->bindValue('name', $this->name, self::guessType($this->name));
$stmt->bindValue('location', $this->location, self::guessType($this->location));
$stmt->bindValue('date_established', $this->date_established, self::guessType($this->date_established));
$stmt->bindValue('area_in_acres', $this->area_in_acres, self::guessType($this->area_in_acres));
$stmt->bindValue('description', $this->description, self::guessType($this->description));
$stmt->execute();
$this->id = self::$dbc->lastInsertId();
}
}