Mysql – thesqldump an entire database while using where=’condition’ on individual tables

backupconditionMySQLmysqldump

I have used mysqldump to dump an entire database,

However, when I want to use --where=condition", on individual tables, I have dumped individual tables

mysqldump  --where='condition' mydb table > table.sql

and then reconstructed the database table by table

 for i in *sql; do mysql newdb < i; done

Is it possible to use the where clause with mysqldump on specific tables when dumping an entire database?

Best Answer

You will have to custom script each table

The --where option is designed to help mysqldump a single table

Here is a post I made back in August 15, 2011

Is it possible to mysqldump a subset of a database required to reproduce a query?

Here is an crazy example

Suppose the table is this in the myworld database:

CREATE TABLE data_for_world
(
    id int not auto_increment,
    continent varchar(16),
    primary key (id)
);
insert into data_world (continent)
values ('Asia'),('Africa'),('Eupore'),
('NorthAmerica'),('SouthAmerica'),
('Australia'),('Antarctica');

and you want to break it up into two dumps

one with continents that start with A
one with continents that do not start with A

You will need three files (one for the database schema, and two for the data)

mysqldump --no-data --database myworld > myworld_schema.sql
mysqldump --no-create-info myworld data_for_world --where="substr(continent,1,1)='A'" > data1.sql
mysqldump --no-create-info myworld data_for_world --where="substr(continent,1,1)<>'A'" > data2.sql

Related Solutions

Mysql – How to export thesql database based on a where condition

Using SQL from the mysql command-line:

SELECT * from YOURTABLE
WHERE status=0 and id>20
INTO OUTFILE 'yourtable.csv'
FIELDS TERMINATED BY ','
ENCLOSED BY '"'
LINES TERMINATED BY '\n';

or using mysqldump with the --where= option:

mysqldump -u youruser -p yourdbname yourtablename --where="status=0 and id>20">yourtable.sql

Using phpMyAdmin you can execute the query in the GUI & click "export" under the resultset.

Thesqldump: flush-privileges option

The documentation is misleading. I read it exactly the same way you do, which isn't what the utility does.

Adding --flush-privileges causes mysqldump to include the following in the backup file, after dumping the mysql schema...

--
-- Flush Grant Tables
--

/*! FLUSH PRIVILEGES */;

...which of course causes the server where the dump is being restored to re-read the potentially-changed grant tables.

And, that's all it does.

Confirmation of this can be found in the source code for mysqldump "10.13" (the version bundled with MySQL Server 5.5.30):

if (flush_privileges && using_mysql_db == 0)
{
  fprintf(md_result_file,"\n--\n-- Flush Grant Tables \n--\n");
  fprintf(md_result_file,"\n/*! FLUSH PRIVILEGES */;\n");
}

The using_mysql_db == 0 comparison was confusing at first, but it turns out to be the return value from a string comparison function where "0" means "identical."

Best Answer

Related Solutions

Mysql – How to export thesql database based on a where condition

Thesqldump: flush-privileges option

Related Question