mySQL query to search all tables within a database for a string?

If you are using MySQL Workbench, you can do this by doing right click on the DB Schema you want to search into, and then "Search Table Data...".

In there you can select the "Search using REXEXP" option, and then type your text of search as usual. It will provide the DB rows matching your specific text.

You will need to check the "Search columns of all types" box as well.

Alternatively, if your database is not that huge, you can make a dump and make your search in the .sql generated file.

If you want to do it purely in MySQL, without the help of any programming language, you could use this:

## Table for storing resultant output

CREATE TABLE `temp_details` (
 `t_schema` varchar(45) NOT NULL,
 `t_table` varchar(45) NOT NULL,
 `t_field` varchar(45) NOT NULL
) ENGINE=MyISAM DEFAULT CHARSET=latin1;

## Procedure for search in all fields of all databases
DELIMITER $$
#Script to loop through all tables using Information_Schema
DROP PROCEDURE IF EXISTS get_table $$
CREATE PROCEDURE get_table(in_search varchar(50))
 READS SQL DATA
BEGIN
 DECLARE trunc_cmd VARCHAR(50);
 DECLARE search_string VARCHAR(250);

 DECLARE db,tbl,clmn CHAR(50);
 DECLARE done INT DEFAULT 0;
 DECLARE COUNTER INT;

 DECLARE table_cur CURSOR FOR
 SELECT concat('SELECT COUNT(*) INTO @CNT_VALUE FROM `',table_schema,'`.`',table_name,'` WHERE `', column_name,'` REGEXP ''',in_search,''';')
 ,table_schema,table_name,column_name
 FROM information_schema.COLUMNS
 WHERE TABLE_SCHEMA NOT IN ('information_schema','test','mysql');

 DECLARE CONTINUE HANDLER FOR NOT FOUND SET done=1;

 #Truncating table for refill the data for new search.
 PREPARE trunc_cmd FROM "TRUNCATE TABLE temp_details;";
 EXECUTE trunc_cmd ;

 OPEN table_cur;
 table_loop:LOOP
 FETCH table_cur INTO search_string,db,tbl,clmn;

 #Executing the search
 SET @search_string = search_string;
 SELECT search_string;
 PREPARE search_string FROM @search_string;
 EXECUTE search_string;


 SET COUNTER = @CNT_VALUE;
 SELECT COUNTER;

 IF COUNTER>0 THEN
 # Inserting required results from search to table
 INSERT INTO temp_details VALUES(db,tbl,clmn);
 END IF;

 IF done=1 THEN
 LEAVE table_loop;
 END IF;
 END LOOP;
 CLOSE table_cur;

 #Finally Show Results
 SELECT * FROM temp_details;
END $$
DELIMITER ;

Source: http://forge.mysql.com/tools/tool.php?id=232