php操作mysql总结

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$dbhost='localhost';
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$dbuser='root';
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$dbpass='123456';
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$dbname='products';
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$connect=mysql_connect($dbhost,$dbuser,$dbpass);
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if(!$connect) exit('数据库连接失败！');
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mysql_select_db($dbname,$connect);
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mysql_query('set names utf8');
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//查询
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$sql="SELECT * FROM `category`";
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$result=mysql_query($sql);
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while($row=mysql_fetch_array($result)){
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echo $row['id'];
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}
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//插入
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$sql="INSERT INTO `category` (`id`,`name`) VALUES (NULL,'".$name."')";
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$result=mysql_query($sql);
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if(mysql_affected_rows()){
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echo '插入成功，插入ID为：',mysql_insert_id();
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}else{
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echo '插入失败：',mysql_error();
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}
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//修改
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$sql="UPDATE `category` SET `name`='".$name."' WHERE `id`='".$id."'";
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$result=mysql_query($sql);
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if(mysql_affected_rows()){
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echo '修改成功！';
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}
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//删除
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$sql="DELETE FROM `category` WHERE `id`='".$id."'";
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$result=mysql_query($sql);
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if(mysql_affected_rows()){
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echo '删除成功！';
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}
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//关闭连接
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mysql_close($connect);