find-in-all-databases-tables.sql

/*
Code founded from http://kedar.nitty-witty.com/blog/search-through-all-databases-tables-columns-in-mysql

What will you do if one day some one ask you to find single string in all databases, all tables and in all columns?

I just read such question and tried to find a “ready made” solution.

Reusability is Key Concept !!

But I ended up finding no “copy-paste” material. Some of the posts like http://vyaskn.tripod.com/search_all_columns_in_all_tables.htm helped me out and supported my thinking of “how to do it” !

Here is how I did it – Search through all databases – tables – columns:

    Create a table for storing output.
    Loop through information_schema database’s COLUMNS table to obtain alldatabases, table and column names.
    Execute a count(*) query on database.table for each column with appropriate search string in where condition.
    If count(*) > 0, that perticular column has the search term.
    Insert that triplet (database name, table name, column name) in to a table.
    Select * from table to view respective database,table and column names having the search term.
*/

--kedar.nitty-witty.com

---- Table for storing resultant output
DROP TABLE IF EXISTS `temp_details`;
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 ;