We first prepare the mysql data table. Assume that there is a table student in the project that records student information, and has id, name, sex, age to record the student's name, gender, age and other information respectively.
CREATE TABLE `student` ( `id` int(11) NOT NULL auto_increment, `name` varchar(50) NOT NULL, `sex` varchar(10) NOT NULL, `age` smallint(3) NOT NULL default '0', PRIMARY KEY (`id`) ) ENGINE=MyISAM DEFAULT CHARSET=utf8;
We also need an html interactive page to place the import form and export button.
<form id="addform" action="do.php?action=import" method="post" enctype="multipart/form-data"> <p>请选择要导入的CSV文件:<br/><input type="file" name="file"> <input type="submit" class="btn" value="导入CSV"> <input type="button" class="btn" value="导出CSV" onclick="window.location.href='do.php? action=export'"></p> </form>
After selecting the local csv file, click Import and submit it to do.php?action=import for processing, and click the Export button to request the address do.php?action=export for data export processing.
Import CSV
do.php needs to process the import and export processes separately according to the parameters obtained. The PHP structure is as follows:
include_once ("connect.php"); //连接数据库 $action = $_GET['action']; if ($action == 'import') { //导入CSV //导入处理 } elseif ($action=='export') { //导出CSV //导出处理 }
Import CSV processing process: verify csv File legality (ignored in this article) ->Open to read and parse the fields in the csv file
->Loop to obtain the values of each field->Add to the data table in batches->Complete.
if ($action == 'import') { //导入CSV $filename = $_FILES['file']['tmp_name']; if (empty ($filename)) { echo '请选择要导入的CSV文件!'; exit; } $handle = fopen($filename, 'r'); $result = input_csv($handle); //解析csv $len_result = count($result); if($len_result==0){ echo '没有任何数据!'; exit; } for ($i = 1; $i < $len_result; $i++) { //循环获取各字段值 $name = iconv('gb2312', 'utf-8', $result[$i][0]); //中文转码 $sex = iconv('gb2312', 'utf-8', $result[$i][1]); $age = $result[$i][2]; $data_values .= "('$name','$sex','$age'),"; } $data_values = substr($data_values,0,-1); //去掉最后一个逗号 fclose($handle); //关闭指针 $query = mysql_query("insert into student (name,sex,age) values $data_values");//批量插入数据表中 if($query){ echo '导入成功!'; }else{ echo '导入失败!'; } }
Note that PHP’s own fgetcsv function can easily handle csv. Use this function to read a line from the file pointer and parse the CSV field. The function below parses the csv file fields and returns them as an array.
function input_csv($handle) { $out = array (); $n = 0; while ($data = fgetcsv($handle, 10000)) { $num = count($data); for ($i = 0; $i < $num; $i++) { $out[$n][$i] = $data[$i]; } $n++; } return $out; }
In addition, when importing into the database, we use batch insertion instead of inserting one by one, so when constructing the SQL statement, we need to do a little processing, see the code.
Export CSV
We know that csv file is a plain text file composed of comma delimiters. You can open it with excel, and the effect is the same as xls table.
Export CSV processing flow: Read the student information table->loop records to construct comma-separated field information->set header information->Export the file (download) to local.
... } elseif ($action=='export') { //导出CSV $result = mysql_query("select * from student order by id asc"); $str = "姓名,性别,年龄\n"; $str = iconv('utf-8','gb2312',$str); while($row=mysql_fetch_array($result)){ $name = iconv('utf-8','gb2312',$row['name']); //中文转码 $sex = iconv('utf-8','gb2312',$row['sex']); $str .= $name.",".$sex.",".$row['age']."\n"; //用引文逗号分开 } $filename = date('Ymd').'.csv'; //设置文件名 export_csv($filename,$str); //导出 }
To export the data to local, you need to modify the header information, the code is as follows:
function export_csv($filename,$data) { header("Content-type:text/csv"); header("Content-Disposition:attachment;filename=".$filename); header('Cache-Control:must-revalidate,post-check=0,pre-check=0'); header('Expires:0'); header('Pragma:public'); echo $data; }
Pay attention to the import and export process, because we use unified UTF-8 encoding , be sure to remember to transcode when encountering Chinese characters, otherwise the Chinese characters may be garbled.
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