问题:

I have 2 different databases, let say db_one and db_two. Each one has a table. db1_emp_company and db2_emp_info respectively.

Structure is given below:

db_one           |    db_two __________________________________ db1_emp_company  |    db2_emp_info __________________________________ phone_no         |    contact_no emp_email        |    email_add home_address     |    address

These two databases are hosted by two different php websites on the same server.

I want to synchronize these both tables of different databases. For example if a user update the phone_no of db1_emp_company (in db_one) it should update the contact_no of the db2_emp_info (in db_two). And if a user update the emp_email of db1_emp_company (in db_one)it should update the email_add of db2_emp_info (in db_two). and so on.

Is it possible?

回答1:

For this purpose you can use transactions.

$mysql_host                 = DB_HOST; $mysql_username             = DB_USER; $mysql_password             = DB_PASSWORD; $mysql_database1            = DATABASE1; $mysql_database2            = DATABASE2;  $mysqli = new mysqli($mysql_host, $mysql_username, $mysql_password) or die( mysql_error());  /*  Begin Transaction   */ $mysqli->autocommit(FALSE);    /*  Insert data from db1 to db2 */ $query  =  "    INSERT INTO $mysql_database1.table1";  $a  =   $mysqli->query($query);   $query  =  "    INSERT INTO $mysql_database1.table2             SELECT                  *             FROM $mysql_database2.table2             WHERE NOT EXISTS(SELECT * from $mysql_database1.table2)      "; $d  =   $mysqli->query($query);    if ($a and $b)  {     $mysqli->commit();           echo "Data synched successfully."; } else {              $mysqli->rollback();             echo "Data failed to synch."; }

If one query fails it will not allow the other to run and will roll back. This is only example code. You can use update instead of insert.

回答2:

You can do like this:

On updating db_one table in site1:

 update `db_one`.`db1_emp_company` set phone_no = '1234567890' where conditions_here;  update `db_two`.`db2_emp_info` set contact_no = '1234567890' where conditions_here;

Same thing in db_two:

 update `db_two`.`db2_emp_info` set contact_no = '1234567890' where conditions_here; #Its a same thing as above  update `db_one`.`db1_emp_company` set phone_no = '1234567890' where conditions_here;

If you post your code which is used for updating things. It will be helpful to give exact answer.

回答3:

You can use mysqldiff for this issue. Check this page: http://www.mysqldiff.org/index.php

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文章来源: How to synchronize two tables of different MySQL databases on the same machine?

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emp