I have table which has a few data.
name score
1 AAA 100
2 BBB 98
3 CCC 85
Now I want to make the insert sentence such as
insert into pepolescore(name,score) VALUE("CCC",85)
automatically.
Is there any command to do this or any function ? by mysql commandline or phpmyadmin.
MySQL queries can address another schema on the same MySQL Server instance by using qualified table names. See https://dev.mysql.com/doc/refman/8.0/en/identifier-qualifiers.html
But this does not work if the tables are on separate MySQL Servers. A given SQL query can only address schemas on the same server.
Here are a few workarounds:
Use mysqldump to export data from one table and then use mysql to import it to the other table on the other instance. You need to be careful not to let mysqldump output the DROP TABLE command, so read about the options here: https://dev.mysql.com/doc/refman/8.0/en/mysqldump.html
MySQL supports a table engine called FEDERATED, where a table can function as a sort of proxy to a table on another MySQL Server. Then you can use INSERT ... SELECT syntax as if the tables were co-located on the same MySQL Server. The Federated engine has limitations, so read https://dev.mysql.com/doc/refman/8.0/en/federated-storage-engine.html and its subsections to learn more.
Use a community tool such as pt-archiver to copy data from one MySQL instance to the other. Read the manual to learn more: https://docs.percona.com/percona-toolkit/pt-archiver.html
Write your own custom code in a client application. Create two connections, one for each MySQL Server. Fetch query results from the first server, and store the resulting rows in variables in your application. Then use these rows as the tuples to insert using the second connection to the other MySQL Server. This involves writing more code, but you get a lot of flexibility.
Related
I have two different databases. I have to access data from one database and insert them into another ( with some data processing included, it is not only to copy data ) Also, the schema is really complex and each table has many rows, so copying data into schema in the second database is not an option. I have to do that using MySQL Workbench, so I have to do it using SQL queries. Is there a way to create a connection from one database to another and access its data?
While MySQL Workbench can be used to transfer data between servers (e.g. as part of a migration process) it is not useful when you have to process the data first. Instead you have 2 other options:
Use a dedicated tool you write yourself to do that (as eddwinpaz mentioned).
Use the capabilities of your server. That is, copy the data to the target server, into a temporary table (using dump and restore). Then use queries to modify the data as you need it. Finally copy it to the target table.
I have one MySQL db on server A and another MySQL instance on a server B. There is a need to copy records (fastest possible) from one table to another (based on user providing ID for records that match) from server A -> B many times during the day. Is there a way to create an SQL statement to do this or data need to be extracted by some programming language (e.g. Perl, Python etc.), then store result in variables and then prepare Insert statement in order to to insert data to server B?
Servers have 2 different IPs and DBs are on 2 different ports but they are the same version of MySQL (5.6.29).
you could use the replication facilities of MySQL
I don't have enough reputation to just comment, but I think the easiest approach would be to create a view on server A with just that data that server B needs, then create a cron job on server B to periodically query the view & import the data during the day. For the job on B I would suggest you script it and create logfiles for debugging, but you could just put a mysql command in your crontab if you want it quick and dirty.
I have a mysql database with lots of tables and records in it. I want to get the list of queries which were used to create tables , insert records etc in that mysqldb. Is it possible. I have seen it in Oracle sql developer. If we click on the table we can view the queries which we have used, for DDL. How to do that in msyql. I am using mysql command line client.
You could use the mysqldump-utility for that
In Linux:
mysqldump my_database_name >dumpfile.sql
I'm getting data from an MSSQL DB ("A") and inserting into a MySQL DB ("B") using the date created in the MSSQL DB. I'm doing it with simple logics, but there's got to be a faster and more efficient way of doing this. Below is the sequence of logics involved:
Create one connection for MSSQL DB and one connection for MySQL DB.
Grab all of data from A that meet the date range criterion provided.
Check to see which of the data obtained are not present in B.
Insert these new data into B.
As you can imagine, step 2 is basically a loop, which can easily max out the time limit on the server, and I feel like there must be a way of doing this must faster and during when the first query is made. Can anyone point me to right direction to achieve this? Can you make "one" connection to both of the DBs and do something like below?
SELECT * FROM A.some_table_in_A.some_column WHERE
"it doesn't exist in" B.some_table_in_B.some_column
A linked server might suit this
A linked server allows for access to distributed, heterogeneous
queries against OLE DB data sources. After a linked server is created,
distributed queries can be run against this server, and queries can
join tables from more than one data source. If the linked server is
defined as an instance of SQL Server, remote stored procedures can be
executed.
Check out this HOWTO as well
If I understand your question right, you're just trying to move things in the MSSQL DB into the MySQL DB. I'm also assuming there is some sort of filter criteria you're using to do the migration. If this is correct, you might try using a stored procedure in MSSQL that can do the querying of the MySQL database with a distributed query. You can then use that stored procedure to do the loops or checks on the database side and the front end server will only need to make one connection.
If the MySQL database has a primary key defined, you can at least skip step 3 ("Check to see which of the data obtained are not present in B"). Use INSERT IGNORE INTO... and it will attempt to insert all the records, silently skipping over ones where a record with the primary key already exists.
I would like to select data from a second MySQL database in order to migrate data from one server to another.
I'm looking for syntax like
SELECT * FROM username:password#serverip.databaseName.tableName
Is this possible? I would be able to do this in Microsoft SQL Server using linked servers, so I'm assuming it's possible in MySQL as well.
You can create a table using FEDERATED storage engine:
CREATE TABLE tableName (id INT NOT NULL, …)
ENGINE=FEDERATED
CONNECTION='mysql://username:password#serverip/databaseName/tableName'
SELECT *
FROM tableName
Basically, it will serve as a view over the remote tableName.
There are generally two approaches you can take, although neither of them sound like what you're after:
Use replication and set up a master/slave relationship between the two databases.
Simply dump the data (using the command line mysqldump tool) from the 1st database and import it into the 2nd.
However, both of these will ultimately migrate all of the data (i.e.: not a subset), although you can specify specific table(s) via mysqldump. Additionally, if you use the mysqldump approach and you're not using InnoDB you'll need to ensure that the source database isn't in use (i.e.: has integrity) when the dump is created.
You can't do this directly, but as someone else alluded to in a comment, you can use mysqldump to export the contents of a table as a SQL script.
At that point you could run the script on the new server to create the table, or if more manipulation of the data is required, import that data into a table with a different name on the new server, then write a query to copy the data from there.