详解Yii框架批量插入数据的简单扩展类

MySQL INSERT语句允许插入多行数据，如下所示：

INSERT INTO tbl_name (a,b,c) VALUES(1,2,3),(4,5,6),(7,8,9);

那么要实现批量插入，主要的任务就是按照列顺序，把数据组装成上述格式即可，可以使用sprintf和vsprintf函数来实现。

下面是一个实现批量插入的Yii扩展类的简单示例（支持VARCHAR类型数据）：

<?php
/**
 * class for sql batch insert
 */
class CDbBICommand extends CDbCommand{
  /** @var CActiveRecord $class */
  private $class;
  /** @var string $insert_tpl */
  private $insert_tpl = "insert into %s(%s) ";
  /** @var string $value_tpl */
  private $value_tpl = "(%s)";
  /** @var string $query */
  public $query;
  /** @var CDbColumnSchema[] $columns */
  private $columns;
  /** @var boolean $fresh */
  private $fresh;
  /** @param CActiveRecord $class
   * @param CDbConnection $db
   */
  public function __construct($class,$db){
   $this->class = $class;
   $this->createtpl();
   parent::_construct($db);
  }
  private function createtpl(){
   $this->fresh = true;
   $value_tpl = "";
   $columns_string = "";
   $this->columns = $this->class->getMetaData()->tableSchema->columns;
   $counter = 0;
   foreach($this->columns as $column){
    /** @var CDbColumnSchema $column */
    if($column->autoIncrement){
     $value_tpl .= "0";
    }else{
     $value_tpl .= "\"%s\"";
    }
    $columns_string .= $column->name;
    $counter ++;
    if($counter != sizeof($this->columns)){
     $columns_string .= ", ";
     $value_tpl .= ", ";
    }
   }
   $this->insert_tpl = sprintf($this->insert_tpl, $this->class->tableName(), $columns_string);
   $this->value_tpl = sprintf($this->value_tpl, $value_tpl);
  }
  /**
   * @param CActiveRecord $record
   */
  public function add($record){
   $values = array();
   $i = 0;
   foreach($this->columns as $column){
    if($column->autoIncrement){
     continue;
    }
    $values[$i] = $this->class->{$column->name};
    $i ++;
   }
   if(!$this->fresh){
    $this->query .= ",";
   }else{
    $this->query = "values";
   }
   $this->fresh = false;
   $this->query .= vsprintf($this->value_tpl, $values);
   return true;
  }
  public function execute(){
   $this->setText($this->insert_tpl." ".$this->query);
   return parent::execute();
  }
}

使用方法是通过add方法逐个加入数据，然后调用execute执行。

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