php实现mysql同步的实现方法_php技巧
拿到需求之后,发现这两个网站的MYSQL数据库都不能远程访问(安全第一吧)。于是想起了 平时使用的CSV文件批量录入数据。于是
尝试使用CSV导入导出。
导入到处框架如下:
1首先将数据导出成CSV的格式。
建立一文件,放置在中国服务器上:csv.php.其实就是一个导出函数,通过数据库,表名和SQL语句来获得数据。
csv.php
/**
* 输出一个数据库中的表到一个CSV文件中
*
* @param string Mysql数据库的主机
* @param string 数据库名称
* @param string 数据库中的表名
* @param string 数据库的连接用户名
* @param string 数据库的连接密码
* @param string 数据库的表名
* @param string 数据库的
* @param string 错误页面
* @param string SQL语句
*
* @return text 返回CSV格式的内容
*
* @access public
*/
function PMA_exportData(host,db,user,pass,filename,table, crlf, error_url, sql_query) {
what="csv";
csv_terminated=" ";
csv_separator=",";
csv_enclosed=" ";
csv_escaped=" ";
mysql_connect(host, user,pass) or die("不能连接数据库,错误代码如下:" . mysql_error());
mysql_select_db(db);
result = mysql_query(sql_query);
fields_cnt = mysql_num_fields(result);
cc="";
//fp = fopen(filename, 'w');
// 格式化数据
while (row = mysql_fetch_row(result)) {
schema_insert = '';
for (j = 0; j if (!isset(row[j]) || is_null(row[j])) {
schema_insert .="NULL"; //用什么来替换空值
} elseif (row[j] == '0' || row[j] != '') {
// loic1 :用引号包含字段值
if (csv_enclosed == '') {
schema_insert .= row[j];
} else {
schema_insert .= csv_enclosed
. str_replace(csv_enclosed, csv_escaped . csv_enclosed, row[j])
. csv_enclosed;
}
} else {
schema_insert .= '';
}
if (j schema_insert .= csv_separator;
}
} // end for
// fwrite(fp,schema_insert . csv_terminated);
cc.=schema_insert . csv_terminated;
} // end while
mysql_free_result(result);
// fclose(fp);
return cc;
}
?>
2.将CSV格式的内容导入到表中
在美国服务器上建立个导入的文件,放置:import.php ,代码如下:
/**
* 从一个上传的文件中将数据导入到一个表中
*
* @param string Mysql数据库的主机
* @param string 数据库名称
* @param string 数据库中的表名
* @param string 数据库的连接用户名
* @param string 数据库的连接密码
* @param string 数据库的表名
*
* @return bool 是否执行成功
*
* @access public
*/
function uploadFileOfCsv(host,db,user,pass,table,content){
mysql_connect(host, user,pass) or die("不能连接数据库,错误代码如下:" . mysql_error());
mysql_select_db(db);
result = mysql_query("select * from table");
fields_cnt = mysql_num_fields(result);
test2=array(array());
rownum=0;
log("提取的数据如下:
".content);
fd1 = fopen ("C:test.csv",'a');
fwrite(fd1,content);
fclose(fd1);
fp = fopen("C:test.csv", "r");
while (buffer = fgets(fp,4096))
{
i++;
tmp_arr = explode(",",buffer);
if(trim(tmp_arr[0]) == ""){
echo "";
exit;
}
query = "INSERT INTO db.table";
query .=" values ( ";
for(q=0;q
tmp=tmp_arr[q];
query.="'tmp');";
}else{
tmp=tmp_arr[q];
query.="'tmp',";
}
}//end for(q=0;
log2(query);
mysql_query(query);
}
fclose(fp);
return "OK";
unlink("C:test.csv");
}
function log2(event = null){
//global db;
// global login;
if(LOG_ENABLED){
now = date("Y-M-d H:i:s");
fd = fopen ("C:log.html",'a');
log = now." "._SERVER["REMOTE_ADDR"] ." - event
";
fwrite(fd,log);
fclose(fd);
}
}
?>
3调用函数执行导出
在中国服务器上再建立一个 文件:test_export.php,调用前面的csv.php的函数,然后将数据转成CSV,然后临时存到一个表单的
textera中,注意表单提交的位置:
require_once("csv.php");
host="localhost";
db="project";
user="root";
pass="";
//导出tb_contact表的数据为csv文件
filename = 'file4.csv';
cc=PMA_exportData( host,db,user,pass, filename,"tb_project_dvp", "", "test.php", "select * from tb_project_dvp") ;
handle = fopen(filename, "rb");
contents = fread(handle, filesize (filename));
fclose(handle);
?>
再在美国服务器上防置如下文件用于接受上传上来的数据,文件名为 test_import.php:
require_once("csv.php");
require_once("import.php");
host="localhost";
db="wintopweb";
user="root";
pass="";
if(_POST['action']=="1"){
content=_POST['textarea'];
echo uploadFileOfCsv(host,db,user,pass,"tb_project_dvp",content);
}
?>
最后 利用Windows-xp/nt/03 控制面版中自带 任务计划,调度执行中国服务器test_export.php文件即可

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