ThinkPHP框架实现的MySQL数据库备份功能示例

<?php
/**
 * 描述:基于ThinkPHP框架的Mysql数据库导出类
 * 日期:2012-07-15
 * 作者:龚辟愚
 */
class DBExport
{
  /**
   * @description 获取当前数据库的所有表名。
   * @static
   * @return array
   */
  static protected function getTables()
  {
    $dbName=C('DB_NAME');
    $result=M()->query("SHOW FULL TABLES FROM `{$dbName}` WHERE Table_Type = 'BASE TABLE'");
    foreach ($result as $v){
      $tbArray[]=$v['Tables_in_'.C('DB_NAME')];
    }
    return $tbArray;
  }
  static protected function getViews()
  {
    $dbName=C('DB_NAME');
    $result=M()->query("SHOW FULL TABLES FROM `{$dbName}` WHERE Table_Type = 'VIEW'");
    foreach ($result as $v){
      $tbArray[]=$v['Tables_in_'.C('DB_NAME')];
    }
    return $tbArray;
  }
  /**
   * @description 导出SQL数据，但不包含表创建代码。
   * @static
   * @return string
   */
  static public function ExportAllData()
  {
    $tables = self::getTables();
    $arrAll = array(
      "SET FOREIGN_KEY_CHECKS=0;",
      self::BuildAllTriggerDropSql(),
      self::BuildTableSql(),
      self::BuildViewSql()
    );
    $tbl = new Model();
    foreach($tables as $table)
    {
      $arrAll[]="\r\nDELETE FROM {$table};";
      /*
      $rs = $tbl->query("SHOW COLUMNS FROM {$table}");
      $arrFields = array();
      foreach ($rs as $k=>&$v){
        $arrFields[] = "`{$v['Field']}`";
      }
      $sqlFields = implode($arrFields,",");
      */
      $rs=$tbl->query("select * from `{$table}`");
      foreach ($rs as $k=>&$v){
        $arrValues = array();
        foreach($v as $key=>$val)
        {
          if(is_numeric($val)){
            $arrValues[]=$val;
          }else if(is_null($val)){
            $arrValues[]='NULL';
          }else{
            $arrValues[]="'".addslashes($val)."'";
          }
        }
        $arrAll[] = "INSERT INTO `{$table}` VALUES (".implode(',',$arrValues).");";
      }
    }
    $arrAll[]=self::BuildTriggerCreateSql();
    return implode("\r\n",$arrAll);
  }
  static protected function BuildTableSql()
  {
    $tables = self::getTables();
    $arrAll = array();
    foreach($tables as &$val){
      $rs = M()->query("SHOW CREATE TABLE `{$val}`");
      $tbSql = preg_replace("#CREATE(.*)\\s+TABLE#","CREATE TABLE",$rs[0]['Create Table']);
      $arrAll[] = "DROP TABLE IF EXISTS `{$rs[0]['Table']}`;\r\n{$tbSql};\r\n";
    }
    return implode("\r\n",$arrAll);
  }
  static protected function BuildViewSql()
  {
    $views = self::getViews();
    $arrAll = array();
    foreach($views as &$val){
      $rs = M()->query("SHOW CREATE VIEW `{$val}`");
      $tbSql = preg_replace("#CREATE(.*)\\s+VIEW#","CREATE VIEW",$rs[0]['Create View']);
      $arrAll[] = "DROP VIEW IF EXISTS `{$rs[0]['View']}`;\r\n{$tbSql};\r\n";
    }
    return implode("\r\n",$arrAll);
  }
  /**
   * @description 如果存在触发器，生成删除代码。原因是:插入数据的时候可能会受到触发器影响。
   * @static
   * @return string
   */
  static public function BuildAllTriggerDropSql()
  {
    $rs = M()->query("show triggers");
    $arrAll = array();
    foreach ($rs as $k=>&$v)
    {
      $arrSql = array(
        'DROP TRIGGER IF EXISTS `',$v['Trigger'],'`;'
      );
      $arrAll[] = implode('',$arrSql);
    }
    return implode("\r\n",$arrAll);
  }
  /**
   * @description 生成所有触发器的创建代码。
   * @static
   * @return string
   */
  static protected function BuildTriggerCreateSql()
  {
    $rs = M()->query("show triggers");
    $arrAll = array();
    foreach ($rs as $k=>&$v)
    {
      $arrSql = array(
        'CREATE TRIGGER `',$v['Trigger'],'` ',$v['Timing'],' ',$v['Event'],' ON `',
        $v['Table'],'` FOR EACH ROW ',$v['Statement'],';'
      );
      $arrAll[] = implode('',$arrSql);
    }
    return implode("\r\n",$arrAll);
  }
}

vendor('DBExport',COMMON_PATH);
header('Content-type: text/plain; charset=UTF-8');
$dbName = C('DB_NAME');
header("Content-Disposition: attachment; filename=\"{$dbName}.sql\"");
echo DBExport::ExportAllData()