1 <?php
2 $dbConfig = require_once(dirname(__FILE__).‘/config.php‘);
3
4 class Db{
5 public $conn;
6 private $host = null;
7 private $user = null;
8 private $password = null;
9 private $database = null;
10 private $tablename = null;
11 private $dbConfig = null;
12 private $sql = [
13 ‘where‘ => null,
14 ‘orderBy‘ => null,
15 ‘limit‘ => null,
16 ];
17
18
19 public function __construct($tablename = ‘‘) {
20 global $dbConfig;
21 $this->dbConfig = $dbConfig;
22 $this->tablename = $dbConfig[‘DB_PREFIX‘].$tablename;
23 $this->user = $dbConfig[‘DB_USER‘];
24 $this->host = $dbConfig[‘DB_HOST‘];
25 $this->password = $dbConfig[‘DB_PWD‘];
26 $this->database = $dbConfig[‘DB_NAME‘];
27 $dsn = ‘mysql:dbname=‘.$this->database.‘;host=‘.$this->host.‘;port=3306‘;
28 try {
29 $this->conn = new PDO($dsn, $this->user, $this->password); // also allows an extra parameter of configuration
30 } catch(PDOException $e) {
31 die(‘Could not connect to the database:<br/>‘ . $e);
32 }
33 }
34
35 public function table($tablename) {
36 $this->tablename = $this->dbConfig[‘DB_PREFIX‘].$tablename;
37 return $this;
38 }
39
40 public function getAll($fields = ‘*‘) {
41 $querySql = sprintf("SELECT %s FROM %s", $fields, $this->tablename);
42 if(!empty($this->sql[‘where‘])) {
43 $querySql .= ‘ WHERE ‘ . $this->sql[‘where‘];
44 }
45 if(!empty($this->sql[‘orderBy‘])) {
46 $querySql .= ‘ ORDER BY ‘ . $this->sql[‘orderBy‘];
47 }
48 if(!empty($this->sql[‘limit‘])) {
49 $querySql .= ‘ LIMIT ‘ . $this->sql[‘limit‘];
50 }
51 return $this->query($querySql);
52 }
53
54 public function getOne($fields = ‘*‘) {
55 $result = $this->getAll($fields);
56 return isset($result[0]) ? $result[0] : null;
57 }
58
59 public function insert($data) {
60 foreach ($data as $key => &$value) {
61 $value = addslashes($value);
62 }
63 $keys = "`".implode(‘`,`‘, array_keys($data))."`";
64 $values = "‘".implode("‘,‘", array_values($data))."‘";
65 $querySql = sprintf("INSERT INTO %s ( %s ) VALUES ( %s )", $this->tablename, $keys, $values);
66 return $this->query($querySql);
67 }
68
69 public function delete() {
70 $querySql = sprintf("DELETE FROM %s WHERE ( %s )", $this->tablename, $this->sql[‘where‘]);
71 return $this->query($querySql);
72 }
73
74 public function update($data) {
75 $updateFields = [];
76 foreach ($data as $key => $value) {
77 $up_value = addslashes($value);
78 $updateFields[] = "`$key`=‘$up_value‘";
79 }
80 $updateFields = implode(‘,‘, $updateFields);
81 $querySql = sprintf("UPDATE %s SET %s", $this->tablename, $updateFields);
82
83 if(!empty($this->sql[‘where‘])) {
84 $querySql .= ‘ WHERE ‘ . $this->sql[‘where‘];
85 }
86
87 return $this->query($querySql);
88 }
89
90 public function query($querySql) {
91 $querystr = strtolower(trim(substr($querySql,0,6)));
92 $stmt = $this->conn->prepare($querySql);
93 $ret = $stmt->execute();
94
95 if(!$ret) print_r($stmt->errorInfo());
96
97 if($querystr == ‘select‘) {
98 $retData = $stmt->fetchAll(PDO::FETCH_ASSOC);
99 return $retData;
100 }elseif($ret && $querystr == ‘insert‘) {
101 return $this->conn->lastInsertId();
102 }else{
103 return $ret;
104 }
105 }
106
107
108 public function limit($limit, $limitCount = null) {
109 if(!$limitCount) {
110 $this->sql[‘limit‘] = $limit;
111 }else{
112 $this->sql[‘limit‘] = $limit .‘,‘. $limitCount;
113 }
114 return $this;
115 }
116
117 public function orderBy($orderBy) {
118 $this->sql[‘orderBy‘] = $orderBy;
119 return $this;
120 }
121
122 public function close() {
123 return $this->conn = null;
124 }
125
126 public function where($where) {
127 if(!is_array($where)) {
128 return null;
129 }
130 $crondsArr = [];
131 foreach ($where as $key => $value) {
132 $fieldValue = $value;
133 if(is_array($fieldValue)) {
134 $crondsArr[] = "$key ".$fieldValue[0]. ‘ ‘ . addslashes($fieldValue[1]);
135 }else{
136 $fieldValue = addslashes($fieldValue);
137 $crondsArr[] = "$key=‘$fieldValue‘";
138 }
139 }
140 $this->sql[‘where‘] = implode(‘ AND ‘, $crondsArr);
141
142 return $this;
143 }
144
145 }
原文地址：https://www.cnblogs.com/chbyl/p/10199151.html
时间： 2024-10-09 09:57:09