Sometimes, you need to search for a certain string from the entire MySQL library, but you don't know which field in which table, use the following stored procedure, So Easy.
DELIMITER //
DROP PROCEDURE IF EXISTS `proc_FindStrInAllDB`//
# CALL `proc_FindStrInAllDB` ('testdb','中');
CREATE PROCEDURE `proc_FindStrInAllDB`
(
IN p_dbname VARCHAR(128),
IN p_finstr VARCHAR(128)
)
BEGIN
-- Need to define variables that receive cursor data
DECLARE tmp_dbname VARCHAR(128);
DECLARE tmp_tbname VARCHAR(128);
DECLARE tmp_colname VARCHAR(128);
-- traverse the end of data flag
DECLARE done INT DEFAULT FALSE;
-- cursor
DECLARE cur_db_tb CURSOR
FOR
SELECT
#*,
C.table_schema,C.table_name,C.COLUMN_NAME
FROM
information_schema.`COLUMNS` C
INNER JOIN information_schema.`TABLES` T ON C.`TABLE_NAME`=T.`TABLE_NAME`
WHERE
T.`TABLE_TYPE`='BASE TABLE'
AND
(C.data_type LIKE '%char%' OR C.data_type LIKE '%text%')
AND
(C.TABLE_SCHEMA=p_dbname OR IFNULL(p_dbname,'') ='') AND IFNULL(p_finstr,'')<>'';
-- bind the end marker to the cursor
DECLARE CONTINUE HANDLER FOR NOT FOUND SET done = TRUE;
CREATE TEMPORARY TABLE IF NOT EXISTS rstb(dbname VARCHAR(128),tbname VARCHAR(128),colname VARCHAR(128),cnt INT);
-- open cursor
OPEN cur_db_tb;
-- start loop
read_loop: LOOP
-- Extract the data in the cursor, there is only one here, and the same is true for multiple;
FETCH cur_db_tb INTO tmp_dbname,tmp_tbname,tmp_colname;
-- at the end of the statement
IF done THEN
LEAVE read_loop;
END IF;
-- here do what you want to do in the event loop
SET @sqlstr=CONCAT('select count(1) into @rn from ',tmp_dbname,'.',tmp_tbname,' where ',tmp_colname,' like ''%',p_finstr,'%''');
PREPARE str FROM @sqlstr;
EXECUTE str;
DEALLOCATE PREPARE str;
IF IFNULL(@rn,0)>0
THEN
INSERT INTO rstb VALUES(tmp_dbname,tmp_tbname,tmp_colname,@rn);
END IF;
END LOOP;
-- close cursor
CLOSE cur_db_tb;
SELECT * FROM rstb;
DROP TABLE rstb;
END
//
DELIMITER ;