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PHP操作Mysql中的BLOB字段

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Release: 2016-06-23 13:49:13
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1、MySQL中BLOB字段类型

BLOB类型的字段用于存储二进制数据。
MySQL中,BLOB是个类型系列,包括:TinyBlob、Blob、MediumBlob、LongBlob,这几个类型之间的唯一区别是在存储文件的最大大小上不同。
MySQL的四种BLOB类型

TinyBlob:  最大 255字节
Blob:      最大 65K
MediumBlob:最大 16M
LongBlob:  最大 4G

注意:如果你存储的文件过大,数据库的性能会下降很多。

2、PHP操作BLOB案例

       [1]操作新闻内容

<?php mysql_connect( "localhost", "root", "password"); //连接数据库 	mysql_select_db( "database"); //选定数据库 	//数据插入:	$CONTENT="测试内容";   //$CONTENT为新闻内容	$COMPRESS_CONTENT = bin2hex(gzcompress($CONTENT));		$result=mysql_query( "insert into news (content) value ('$COMPRESS_CONTENT')");//数据插入到数据库news表中		//展示:	$query = "select data from testtable where filename=$filename"; 	$result = mysql_query($query);	$COMPRESS_CONTENT=@gzuncompress($result["COMPRESS_CONTENT"]);	echo $COMPRESS_CONTENT;?>
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       [2]存储图片

<?php mysql_connect( "localhost", "root", "password"); //连接数据库 mysql_select_db( "database"); //选定数据库    //存储:$filename="" //这里填入图片路径 $COMPRESS_CONTENT = addslashes(fread(fopen($filename, "r"), filesize($filename)));//打开文件并规范化数据存入变量$data中$result=mysql_query( "insert into news (content) value ('$COMPRESS_CONTENT')");//数据插入到数据库test表中//展示:ob_end_clean();Header( "Content-type: image/gif");$query = "select data from testtable where filename=$filename"; $result = mysql_query($query);echo $result["COMPRESS_CONTENT"];?>
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