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? ??? ?? PHP ???? ??? ?? ??? ???? PHP? ??? MySQL ???

??? ?? ??? ???? PHP? ??? MySQL ???

Jul 25, 2016 am 08:56 AM

  3. /**

  4. * MySQL ??-?? ?? ???
  5. * $db_config = array(
  6. * 'master' => array('host'=>'localhost:3306','user'=>' admin ','passwd'=>'123456','db'=>'stat'),
  7. * 'slave' => array(
  8. * array('host'=>'localhost : 3307','user'=>'admin','passwd'=>'123456','db'=>'stat'),
  9. * array('host'=>'localhost: 3308 ','user'=>'admin','passwd'=>'123456','db'=>'stat')
  10. * )
  11. * );
  12. *
  13. * ??: ????? ?? ?? ?? ???? ?????
  14. * ?? ??: bbs.it-home.org
  15. */
  16. /*
  17. $db_config = ??(
  18. '???' => array('host'=>'localhost:3306','user'=>'admin','passwd'=>'123456','db'=>' stat'),
  19. '????' => array(
  20. array('host'=>'localhost:3307','user'=>'admin','passwd'=>'123456 ','db'=>'stat'),
  21. array('host'=>'localhost:3308','user'=>'admin','passwd'=>'123456', 'db'=>'stat')
  22. )
  23. );

  24. $db = MySQL::getInstance('','r-w');< ;/p>

  25. $sql = "????? * ??";

  26. $rs = $db->query($sql);

  27. while ($row = $db->fetch($rs)){
  28. echo "uid:".$row['uid']." ".$row['userName']."
    ";
  29. }

  30. echo "

    ";
  31. */

  32. class MySQL

  33. {
  34. private static $_instance = null;//數(shù)據(jù)庫連接實例
  35. private static $_master = null;//主數(shù)據(jù)庫連接實例
  36. private static $_slave = null;//??數(shù)據(jù)庫連接實
  38. public $_config = array();//數(shù)據(jù)庫連接配置信息
  39. public $_res = null;//查詢實例句柄
  40. public $_flag = '';//標(biāo)識當(dāng)前語句是主還是重數(shù)據(jù)庫上執(zhí)行
  41. public $_link = null;
  43. /**
  44. * 單實例
  45. * ??? ??? ?????...
  46. * @paramknown_type $dbname
  47. * @paramknown_type $mode
  48. */
  49. public static function & getInstance($dbname='',$mode='rw '){
  50. if (is_null(self::$_instance)){
  51. self::$_instance = new self();
  52. self::$_instance->__getConf();
  53. self::$_instance->connect($dbname,$mode);
  54. }
  56. return self::$_instance;
  57. }

  58. /**

  59. * ?????? ?? ?? ????
  60. * ??? ??? ?????...
  61. */
  62. ?? ?? __getConf(){
  63. ?? $db_config;
  64. $this->_config['master'] = $db_config['master'];
  65. $this->_config['slave'] = $db_config['slave'];
  66. }
  68. /**
  69. * ?????? ??
  70. * ??? ??? ?????...
  71. * @param $dbname? ??? ?????? ??? ????? ?????.
  72. * @param $mode rw? ?? ?? ?????? ???? r-w? ?? ? ?? ??? ?????
  73. */
  74. ?? ?? connect($dbname='' ,$mode = 'rw'){
  75. if($mode == 'rw'){
  76. if(is_null(self::$_master)){
  77. $this->_master = $this ->_slave = $this->conn_master($dbname);
  78. }
  79. }else{
  80. if(is_null(self::$_master)){
  81. $this->_master = $this->conn_master($dbname);
  82. }
  83. if(is_null(self::$_slave)){
  84. $this->_slave = $this->conn_slave($dbname );
  85. }
  86. }
  87. }
  89. /**
  90. * ?? ?????? ??? ??
  91. * ??? ??? ?????...
  92. */
  93. ?? ?? conn_master($dbname=''){
  94. $_link = mysql_connect( $this->_config['master']['host'],$this->_config['master']['user'],$this->_config['master']['passwd'] ,true) ?? ??("Connect ".$this->_config['master']['host']." ??.");
  95. mysql_select_db(empty($dbname)?$this->_config ['master']['db']:$dbname,$_link) ?? die(" DB ?? ".$this->_config['master']['db']."? ???? ????.") ;
  96. mysql_query("set names utf8",$_link);
  97. return $_link;
  98. }
  100. /**
  101. * ???? ?????? ??? ??
  102. * ??? ??? ?????...
  103. */
  104. ?? ?? conn_slave($dbname=''){
  105. $offset = rand(0,count($this->_config['slave') ])-1);
  106. $_link = @mysql_connect($this->_config['slave'][$offset]['host'],$this->_config['slave'][$offset ]['user'],$this->_config['slave'][$offset]['passwd'],true) ?? die(" ?? ".$this->_config['slave'][$ offset]['host']." ??.");
  107. mysql_select_db(empty($dbname)?$this->_config['slave'][$offset]['db']:$dbname,$ _link) ?? die(" DB ?? ".$this->_config['slave'][$offset]['db']."? ???? ????.");
  108. mysql_query("set names utf8" ,$_link);
  109. $_link ??
  110. }

  111. /**

  112. * ?????? ?? ??
  113. * ??? ??? ?????...
  114. * @param string $sql
  115. */
  116. ?? ?? ??($sql,$master=true){

  117. if($master == true || (substr(strtolower($sql),0,6) != 'select') && $master == false){

  118. $this->_res = mysql_query($sql ,$this->_master);
  119. if(!$this->_res){
  120. $this->_error[] = mysql_error($this->_master);
  121. }
  122. $this->_flag = '???';
  123. $this->_link = $this->_master;
  124. } else {
  125. $this->_res = mysql_query($sql ,$this->_slave);
  126. if(!$this->_res){
  127. $this->_error[] = mysql_error($this->_slave);
  128. }
  129. $this->_flag = 'slave';
  130. $this->_link = $this->_slave;
  131. }

  132. return $this->_res;

  133. }
  135. /**
  136. * ?? ??? ? ????
  137. * ??? ?? ?? ...
  138. * @param ?? $rs
  139. */
  140. ?? ?? get($rs=''){
  141. if(empty($rs) ){
  142. $rs = $this->_res;
  143. }
  144. return mysql_fetch_row($rs);
  145. }
  147. /**
  148. * ?? ? ??? ????
  149. * ??? ??? ????? ...
  150. * @param mix $rs
  151. * @param $result_type
  152. */
  153. ?? ?? fetch($rs = ''){
  154. if(empty($rs)){
  155. $rs = $this->_res;
  156. }
  157. return mysql_fetch_array($rs,MYSQL_ASSOC );
  158. }
  160. /**
  161. * ??? ??
  162. * ??? ??? ?????...
  163. * @paramknown_type $sql
  164. */
  165. ?? ?? add($sql){
  166. $rs = $this->query($sql);
  167. if($rs)
  168. return mysql_insert_id($this->_link);
  169. return false;
  170. }
  172. /**
  173. * ??? ????
  174. * ??? ??? ?????...
  175. * @paramknown_type $sql
  176. */
  177. ?? ?? ???? ($sql){
  178. if(empty($sql)) return false;
  179. $rs = $this->query($sql);
  180. if($rs)
  181. return $this ->fetchNum();
  182. return false;
  183. }

  184. /**

  185. * ?? ???? ??? ?? ? ? ????
  186. * ??? ?? ??...
  187. */
  188. ?? ?? fetchNum(){
  189. return mysql_affected_rows($this->_link);
  190. }
  192. /**
  193. * ???, ?????? ?? ??? ??
  194. * ??? ??? ?????...
  195. */
  196. ?? ?? __destruct(){
  197. mysql_close($this->_link);
  198. }
  199. }

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