将Session写入数据库，Session写入数据库

使用session_set_save_handler()函数，将Session的内容写入数据库
<span>  1</span> <?<span>php
</span><span>  2</span>     <span>/*</span>
<span>  3</span> <span>    *@author    Fahy
</span><span>  4</span> <span>    *@link    http://home.cnblogs.com/u/HuangWj
</span><span>  5</span> <span>    *数据库为mysql，
</span><span>  6</span> <span>    *数据库名为session，表名为session，
</span><span>  7</span> <span>    *表中字段包括PHPSESSID,update_time,client_ip,data
</span><span>  8</span>     <span>*/</span>
<span>  9</span>     <span>class</span><span> Session{
</span><span> 10</span>         <span>private</span> <span>static</span> <span>$handler</span> = <span>null</span><span>;
</span><span> 11</span>         <span>private</span> <span>static</span> <span>$ip</span> = <span>null</span><span>;
</span><span> 12</span>         <span>private</span> <span>static</span> <span>$lifetime</span> = <span>null</span><span>;
</span><span> 13</span>         <span>private</span> <span>static</span> <span>$time</span> = <span>null</span><span>;
</span><span> 14</span>         
<span> 15</span>         <span>//</span><span>配置静态变量</span>
<span> 16</span>         <span>private</span> <span>static</span> <span>function</span> init(<span>$handler</span><span>){
</span><span> 17</span>             self::<span>$handler</span> = <span>$handler</span>;        <span>//</span><span>获取数据库资源</span>
<span> 18</span>             self::<span>$ip</span> = !<span>empty</span>(<span>$_SERVER</span>["REMOTE_ADDR"])? <span>$_SERVER</span>["REMOTE_ADDR"]:'unkonw';        <span>//</span><span>获取客户端ip</span>
<span> 19</span>             self::<span>$lifetime</span> = <span>ini_get</span>('session.gc_maxlifetime');        <span>//</span><span>获取session生命周期</span>
<span> 20</span>             self::<span>$time</span> = <span>time</span>();        <span>//</span><span>获取当前时间</span>
<span> 21</span> <span>        }
</span><span> 22</span>         <span>//</span><span>调用session_set_save_handler()函数并开启session</span>
<span> 23</span>         <span>static</span> <span>function</span> start(<span>$pdo</span><span>){
</span><span> 24</span>             self::init(<span>$pdo</span><span>);
</span><span> 25</span>             <span>session_set_save_handler</span><span>(
</span><span> 26</span>                 <span>array</span>(<span>__CLASS__</span>,'open'),
<span> 27</span>                 <span>array</span>(<span>__CLASS__</span>,'close'),
<span> 28</span>                 <span>array</span>(<span>__CLASS__</span>,'read'),
<span> 29</span>                 <span>array</span>(<span>__CLASS__</span>,'write'),
<span> 30</span>                 <span>array</span>(<span>__CLASS__</span>,'destroy'),
<span> 31</span>                 <span>array</span>(<span>__CLASS__</span>,'gc'<span>)
</span><span> 32</span> <span>            );
</span><span> 33</span>             <span>session_start</span><span>();
</span><span> 34</span> <span>        }
</span><span> 35</span>         
<span> 36</span>         <span>public</span> <span>static</span> <span>function</span> open(<span>$path</span>,<span>$name</span><span>){
</span><span> 37</span>             <span>return</span> <span>true</span><span>;
</span><span> 38</span> <span>        }
</span><span> 39</span>         <span>public</span> <span>static</span> <span>function</span><span> close(){
</span><span> 40</span>             <span>return</span> <span>true</span><span>;
</span><span> 41</span> <span>        }
</span><span> 42</span>         
<span> 43</span>         <span>//</span><span>查询数据库中的数据</span>
<span> 44</span>         <span>public</span> <span>static</span> <span>function</span> read(<span>$PHPSESSID</span><span>){
</span><span> 45</span>              <span>$sql</span> = "select PHPSESSID,update_time,client_ip,data from session where PHPSESSID=?"<span>;
</span><span> 46</span>              <span>$stmt</span> = self::<span>$handler</span>->prepare(<span>$sql</span><span>);
</span><span> 47</span>              <span>$stmt</span>->execute(<span>array</span>(<span>$PHPSESSID</span><span>));
</span><span> 48</span>              <span>if</span>(!<span>$result</span> = <span>$stmt</span>->fetch(PDO::<span>FETCH_ASSOC)){
</span><span> 49</span>                  <span>return</span> ''<span>;
</span><span> 50</span> <span>             }
</span><span> 51</span>              <span>if</span>(self::<span>$ip</span> == <span>$result</span>['client_ip'<span>]){
</span><span> 52</span>                  self::destroy(<span>$PHPSESSID</span><span>);
</span><span> 53</span>                  <span>return</span> ''<span>;
</span><span> 54</span> <span>             }
</span><span> 55</span>              <span>if</span>((<span>$result</span>['update_time']+self::<span>$lifetime</span>)<self::<span>$time</span><span>){
</span><span> 56</span>                  self::destroy(<span>$PHPSESSID</span><span>);
</span><span> 57</span>                  <span>return</span> ''<span>;
</span><span> 58</span> <span>             }
</span><span> 59</span>              <span>return</span> <span>$result</span>['data'<span>];
</span><span> 60</span> <span>        }
</span><span> 61</span>         <span>/*</span>
<span> 62</span> <span>         *首先查询该session是否存在数据，如果存在，则更新数据，如果不存在，则插入数据
</span><span> 63</span>          <span>*/</span>
<span> 64</span>         <span>//</span><span>将session写入数据库中，$data传入session中的keys和values数组</span>
<span> 65</span>         <span>public</span> <span>static</span> <span>function</span> write(<span>$PHPSESSID</span>,<span>$data</span><span>){
</span><span> 66</span>             <span>$sql</span> = "select PHPSESSID,update_time,client_ip,data from session where PHPSESSID=?"<span>;
</span><span> 67</span>              <span>$stmt</span> = self::<span>$handler</span>->prepare(<span>$sql</span><span>);
</span><span> 68</span>              <span>$stmt</span>->execute(<span>array</span>(<span>$PHPSESSID</span><span>));
</span><span> 69</span>              
<span> 70</span>              <span>if</span>(<span>$result</span>=<span>$stmt</span>->fetch(PDO::<span>FETCH_ASSOC)){                
</span><span> 71</span>                  <span>if</span>(<span>$result</span>['data'] != <span>$data</span> || self::<span>$time</span> > (<span>$result</span>['update_time']+30<span>)){
</span><span> 72</span>                      <span>$sql</span> = "update session set update_time=?,data=? where PHPSESSID = ?"<span>;
</span><span> 73</span>                      <span>$stmt</span> = self::<span>$handler</span>->prepare(<span>$sql</span><span>);
</span><span> 74</span>                      <span>$stmt</span>->execute(<span>array</span>(<span>$self</span>::<span>$time</span>,<span>$data</span>,<span>$PHPSESSID</span><span>));
</span><span> 75</span> <span>                }
</span><span> 76</span>              }<span>else</span><span>{
</span><span> 77</span>                  <span>if</span>(!<span>empty</span>(<span>$data</span><span>)){
</span><span> 78</span>                      <span>try</span><span>{
</span><span> 79</span>                          <span>$sql</span> = "insert into session(PHPSESSID,update_time,client_ip,data) values(?,?,?,?)"<span>;
</span><span> 80</span>                      }<span>catch</span>(PDOException <span>$e</span><span>){
</span><span> 81</span>                          <span>echo</span> <span>$e</span>-><span>getMessage();
</span><span> 82</span> <span>                     }
</span><span> 83</span>                      <span>$sth</span> = self::<span>$handler</span>->prepare(<span>$sql</span><span>);
</span><span> 84</span>                      <span>$sth</span>->execute(<span>array</span>(<span>$PHPSESSID</span>,self::<span>$time</span>,self::<span>$ip</span>,<span>$data</span><span>));
</span><span> 85</span> <span>                 }
</span><span> 86</span> <span>             }
</span><span> 87</span>              <span>return</span> <span>true</span><span>;
</span><span> 88</span> <span>        }
</span><span> 89</span>         
<span> 90</span>         <span>public</span> <span>static</span> <span>function</span> destroy(<span>$PHPSESSID</span><span>){
</span><span> 91</span>             <span>$sql</span> = "delete from session where PHPSESSID = ?"<span>;
</span><span> 92</span>             <span>$stmt</span> = self::<span>$handler</span>->prepare(<span>$sql</span><span>);
</span><span> 93</span>             <span>$stmt</span>->execute(<span>array</span>(<span>$PHPSESSID</span><span>));
</span><span> 94</span>             <span>return</span> <span>true</span><span>;
</span><span> 95</span> <span>        }
</span><span> 96</span>         <span>public</span> <span>static</span> <span>function</span> gc(<span>$lifetime</span><span>){
</span><span> 97</span>             <span>$sql</span> = "delete from session where update_time<?"<span>;
</span><span> 98</span>             <span>$stmt</span> = self::<span>$handler</span>->prepare(<span>$sql</span><span>);
</span><span> 99</span>             <span>$stmt</span>->execute(<span>array</span>(self::<span>$time</span>-<span>$lifetime</span><span>));
</span><span>100</span>             <span>return</span> <span>true</span><span>;
</span><span>101</span> <span>        }
</span><span>102</span> <span>    }
</span><span>103</span>     <span>//</span><span>使用PDO连接数据库</span>
<span>104</span>     <span>try</span><span>{
</span><span>105</span>         <span>$pdo</span> = <span>new</span> PDO("mysql:host=localhost;dbname=session","root","hwj193"<span>);
</span><span>106</span>     }<span>catch</span>(PDOException <span>$e</span><span>){
</span><span>107</span>         <span>echo</span> <span>$e</span>-><span>getMessage();
</span><span>108</span> <span>    }
</span><span>109</span>     <span>//</span><span>传递数据库资源</span>
<span>110</span>     Session::start(<span>$pdo</span>);
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