基于PHP读取TXT文件向数据库导入海量数据的方法
有一个TXT文件,包含了10万条记录,格式如下: 列1 列2 列3 列4 列5 ……………………后面有10万条……………… 需求是要导入数据库中,数据表的结构为 word_id 自动增量 复制代码 代码如下:
a 00003131 0 0 adductive#1 adducting#1 adducent#1
a 00003356 0 0 nascent#1
a 00003553 0 0 emerging#2 emergent#2
a 00003700 0.25 0 dissilient#1
word 【adductive#1 adducting#1 adducent#1】这一个TXT记录要转换为3个SQL记录
value =第三列-第四列;如果=0,则此条记录略过不插入数据表
$file = 'words.txt';//10W条记录的TXT源文件
$lines = file_get_contents($file);
ini_set('memory_limit', '-1');//不要限制Mem大小,否则会报错
$line=explode("\n",$lines);
$i=0;
$sql="INSERT INTO words_sentiment (word,senti_type,senti_value,word_type) VALUES ";
foreach($line as $key =>$li)
{
$arr=explode(" ",$li);
$senti_value=$arr[2]-$arr[3];
if($senti_value!=0)
{
if($i>=20000&&$i {
$mm=explode(" ",$arr[4]);
foreach($mm as $m) //【adductive#1 adducting#1 adducent#1】这一个TXT记录要转换为3个SQL记录 {
$nn=explode("#",$m);
$word=$nn[0];
$sql.="(\"$word\",1,$senti_value,2),";//这个地方要注意到是 word有可能包含单引号(如jack's),因此我们要用双引号来包含word(注意转义)
}
}
$i++;
}
}
//echo $i;
$sql=substr($sql,0,-1);//去掉最后一个逗号
//echo $sql;
file_put_contents('20000-25000.txt', $sql); //批量导入数据库,5000条一次,大概需要40秒的样子;一次导入太多max_execution_time会不够,导致失败
?>
1,海量数据导入到时候,要注意PHP的一些限制,可以临时调整一下,否则会报错
Allowed memory size of 33554432 bytes exhausted (tried to allocate 16 bytes)
2,PHP操作TXT文件
file_get_contents()
file_put_contents()
3,海量导入的时候,最好分批次导入,失败的几率小一些
4,海量导入之前,脚本一定要多次测试无误再使用,比如用100条数据来测试
5,导入之后,如果PHP的mem_limit还是不够的话,程序仍然跑不起来
(建议用修改php.ini的方式来提高mem_limit,而不是用临时的语句)

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