1 | <?php |
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2 | /* |
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3 | Plugin Name: MySQL Ping |
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4 | Plugin URI: http://kaloyan.info/blog/wp-mysql-ping-plugin/ |
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5 | Description: This plugin is designed to help you deal with the "MySQL Server Has Gone Away" error. |
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6 | Author: Kaloyan K. Tsvetkov |
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7 | Version: 0.1 |
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8 | Author URI: http://kaloyan.info/ |
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9 | */ |
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10 | |
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11 | ///////////////////////////////////////////////////////////////////////////// |
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12 | |
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13 | /** |
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14 | * @internal prevent from direct calls |
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15 | */ |
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16 | if (!defined('ABSPATH')) { |
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17 | return ; |
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18 | } |
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19 | |
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20 | /** |
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21 | * @internal prevent from second inclusion |
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22 | */ |
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23 | if (!class_exists('wpdb2')) { |
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24 | |
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25 | ///////////////////////////////////////////////////////////////////////////// |
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26 | |
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27 | /** |
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28 | * "MySQL Ping" WordPress Plugin |
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29 | * |
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30 | * Extend the default {@link wpdb} class by |
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31 | * adding {@link mysql_ping()} capabilities |
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32 | * |
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33 | * @author Kaloyan K. Tsvetkov <kaloyan@kaloyan.info> |
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34 | * @license http://opensource.org/licenses/gpl-license.php GNU Public License |
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35 | */ |
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36 | Class wpdb2 Extends wpdb { |
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37 | |
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38 | /** |
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39 | * Attemp to ping the MySQL server |
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40 | */ |
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41 | function _ping() { |
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42 | |
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43 | $retry = 5; |
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44 | $failed = 1; |
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45 | |
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46 | // probe w\ a ping |
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47 | // |
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48 | $ping = mysql_ping( $this->dbh ) ; |
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49 | while( !$ping && $failed < $retry) { |
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50 | |
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51 | //$this->print_error('No ping go MySQL server'); |
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52 | |
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53 | // reconnect |
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54 | // |
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55 | $this->dbh = mysql_connect(DB_HOST, DB_USER, DB_PASSWORD, 1); |
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56 | $this->select(DB_NAME); |
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57 | |
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58 | if ( !DB_CHARSET && version_compare(mysql_get_server_info($this->dbh), '4.1.0', '>=')) { |
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59 | $this->query("SET NAMES '" . DB_CHARSET . "'"); |
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60 | } |
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61 | |
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62 | // ping again to check the result |
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63 | // |
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64 | $ping = mysql_ping( $this->dbh ) ; |
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65 | if(!$ping ) { |
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66 | sleep(2); |
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67 | $failed+=1; |
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68 | } |
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69 | } |
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70 | |
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71 | // yet no result ... |
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72 | // |
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73 | if(!$ping ) { |
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74 | $this->print_error( |
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75 | 'Attempted to connect for ' |
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76 | . $retry |
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77 | . ' but failed...' |
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78 | ); |
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79 | } |
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80 | } |
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81 | |
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82 | // -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- |
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83 | |
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84 | /** |
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85 | * Override the original {@link wpdb::query()} method in |
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86 | * order to ping the server before executing every query |
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87 | * |
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88 | * @param string $query |
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89 | * @return mixed |
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90 | */ |
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91 | function query($query) { |
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92 | $this->_ping(); |
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93 | return parent::query($query); |
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94 | } |
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95 | |
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96 | //--end-of-class-- |
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97 | } |
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98 | |
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99 | ///////////////////////////////////////////////////////////////////////////// |
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100 | |
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101 | // create new object, and copy all object's properties |
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102 | // |
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103 | $wpdb2 = new wpdb2(DB_USER, DB_PASSWORD, DB_NAME, DB_HOST); |
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104 | foreach(get_object_vars($wpdb) as $k=>$v) { |
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105 | if (is_scalar($v)) { |
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106 | $wpdb2->$k = $v; |
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107 | } |
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108 | } |
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109 | $wpdb =& $wpdb2; |
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110 | |
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111 | ///////////////////////////////////////////////////////////////////////////// |
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112 | |
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113 | } |
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114 | |
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115 | ?> |
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