Procedure to search through all databases, tables and columns in MySQL DB Server.

mysql-search.sql

# Search through all databases, tables, and columns in a MySQL db.

# From http://kedar.nitty-witty.com/blog/search-through-all-databases-tables-columns-in-mysql

## 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

# Insert results from search
INSERT INTO temp_details VALUES(db,tbl,clmn);
END IF;
IF done=1 THEN
LEAVE table_loop;
END IF;
END LOOP;
CLOSE table_cur;

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

Nice, so then you call get_table('regex search term') and it fills the temp_details table with where to find the string.

On one my table I got error:
Error code: 1365, SQLState: 22012, Message: Division by 0
with test query: CALL get_table('1')