Need to sync two tables from different databases in java

Need to sync two tables from different databases in java

By : user9548
Date : November 19 2020, 01:01 AM
will be helpful for those in need Usually to sync a table with in the network I can write a simple sql query and run it to sync the tables, but what if the source database is different(could be db2, mssql, mysql, oracle - from where I can get the data in to destination table). , You can do this with plain JDBC. Code example, not tested:
code :
void migrate() throws SQLException {
        Connection connA = DriverManager.getConnection("jdbc:oracle:thin:@myhost:1521:orcl");
        Connection connB = DriverManager.getConnection("jdbc:mysql://");

        PreparedStatement stmA = connA.prepareStatement("select * from product where 1=1");
        PreparedStatement stmB = connB.prepareStatement("insert into prod values(?,?,?,?)");

        ResultSet rs = stmA.executeQuery();
        while (rs.next()) {
            for (int i = 0; i < rs.getMetaData().getColumnCount(); i++) {
                stmB.setObject(i + 1, rs.getObject(i + 1));


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Keep tables in sync between databases on the same server

Keep tables in sync between databases on the same server

By : user2828664
Date : March 29 2020, 07:55 AM
it fixes the issue Personally, I'd go with transactional replication. Your other options would be to do this in code with a synchronous trigger or asynchronously via service broker, which IMHO, is a much bigger pain to set up than replication.
sync two tables from two different PostgreSQL databases

sync two tables from two different PostgreSQL databases

By : user3133155
Date : March 29 2020, 07:55 AM
seems to work fine this example will connect to both the databases, and for each of the first db's authors will update the destination db's author with the same id. Of course you have to set up any necessary check, search and other details before perform and update (or an insert or replace if you prefer), but it fully depends on what you're going to do :)
code :

if (false !== ($con1 = pg_connect("your source connection string"))) {
  if (false !== ($con2 = pg_connect("your dest connection string"))) {
    if (false !== ($result = pg_query($con1, "SELECT id, author, email FROM authors"))) {
      while (false !== ($row = pg_fetch_assoc($result))) {
        pg_query($con2, "UPDATE authors SET email=".pg_escape_string($con2, $row['email']).
          'WHERE id='.pg_escape_string($con2, $row['id']));

Sync 2 tables of different databases - MySQL

Sync 2 tables of different databases - MySQL

By : user3434094
Date : March 29 2020, 07:55 AM
hop of those help? You may want to use 'SELECT ... INTO OUTFILE' and 'LOAD DATA INFILE INTO TABLE' commands.
Edit: Elaboration...
code :
CREATE TABLE my_local_table (
    id int NOT NULL auto_increment PRIMARY KEY,
    data varchar(20),
    created_on datetime);

CREATE TABLE server_table (
    id int NOT NULL auto_increment PRIMARY KEY,
    data varchar(20),
    created_on datetime,
    local_id int);
INSERT INTO my_local_table (data, created_on) VALUES ('test', now()), ('test2', now());
SELECT id, data, created_on 
    FROM my_local_table
    WHERE created_on >= '2011-08-18'
    INTO OUTFILE '/tmp/t.txt';

-- (and on the server)
    INTO TABLE server_table
    (local_id, data, created_on);
mysql -e 'SELECT....';
mysql -h remote_server -e 'LOAD DATA...';
How do you sync databases using ms sync framework when tables are using identity column and you need to match on an arbi

How do you sync databases using ms sync framework when tables are using identity column and you need to match on an arbi

By : Harsh Goel
Date : March 29 2020, 07:55 AM
I hope this helps . if you can add an extra column, create a new column based on the "match key" you specified above. Then configure Sync framework to use that column as the PK and ignoring the actual PKs in the table.
the approach should be similar to this post:
Using C# to Sync two tables in different databases

Using C# to Sync two tables in different databases

By : khadija
Date : March 29 2020, 07:55 AM
help you fix your problem There's two solutions to this problem. You could try to be smart and only transfer the changes - but that requires some integration on the source database; I'm sure your db admin can help you with that - potentially triggers that keep track of all touched rows (e.g. using the source table's primary key). This solution scales fairly well, but it's more complicated. I think you should look at a second option: simple brute force.
By the sounds of it, your entire table fits comfortably in 100MB. This just isn't much data. Assuming you can get a transfer rate of 10MB/s (which isn't very outlandish at all), you could transfer everything in just 10 seconds. If, as you say, you only need a few columns, the total data transfer could be considerably less. Going with the 10 second number every five minutes, that'd be on the order of 3% load to keep the data up to date - and it's a trivial query for the source database what will likely not cause much load, especially since it'll all be cached in memory since the data set is so small.
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