发现美的眼睛 Prepared SQL Statement

 DROP PROCEDURE IF EXISTS truncate_insert_sales_rank_toparow_month;
 DELIMITER /w/
 CREATE PROCEDURE truncate_insert_sales_rank_toparow_month ()
 BEGIN
 TRUNCATE sales_rank_toparow_month ;
 INSERT INTO sales_rank_toparow_month (
     fk_country,
     fk_categoryid,
     history_year,
     history_month
 ) SELECT
     country,
     categoryid,
     history_year,
     history_month
 FROM
     grab_sales_rank_month
 GROUP BY
     country,
     categoryid,
     history_year,
     history_month ;
 END/w/
 DELIMITER;
 CALL truncate_insert_sales_rank_toparow_month;

 DROP PROCEDURE IF EXISTS insert_update_sales_rank_toparow_month;
 DELIMITER /w/
 CREATE PROCEDURE insert_update_sales_rank_toparow_month ()
 BEGIN
 SET @wtab = ' sales_rank_toparow_month al ';
 SET @w = 10;
 WHILE @w < 110 DO
     SET @wfield = CONCAT('coin',@w);
     SET @wnewvalue = CONCAT('(SELECT sum_coin FROM grab_sales_rank_month da  WHERE  al.fk_country = da.country  AND al.fk_categoryid = da.categoryid   AND al.history_year = da.history_year  AND al.history_month = da.history_month  AND da.topx=',@w,')');
     SET @wfieldb = CONCAT('amount',@w);
     SET @wnewvalueb = CONCAT('(SELECT sum_amount FROM grab_sales_rank_month da  WHERE  al.fk_country = da.country  AND al.fk_categoryid = da.categoryid   AND al.history_year = da.history_year  AND al.history_month = da.history_month  AND da.topx=',@w,' )');
     SET @wpre = CONCAT('UPDATE ',@wtab,' SET ',@wfield,'=',@wnewvalue,',',@wfieldb,'=',@wnewvalueb);
     PREPARE  stmt FROM @wpre ;
     EXECUTE  stmt  ;
     DROP PREPARE stmt;
 SET @w = @w + 10 ;
 END
 WHILE ;
 END/w/
 DELIMITER ;
 CALL insert_update_sales_rank_toparow_month;

 DROP PROCEDURE IF EXISTS truncate_insert_sales_rank_toparow_week;
 DELIMITER /w/
 CREATE PROCEDURE truncate_insert_sales_rank_toparow_week ()
 BEGIN
 TRUNCATE sales_rank_toparow_week ;
 INSERT INTO sales_rank_toparow_week (
     fk_country,
     fk_categoryid,
     history_year,
     history_week
 ) SELECT
     country,
     categoryid,
     history_year,
     history_week
 FROM
     grab_sales_rank_week
 GROUP BY
     country,
     categoryid,
     history_year,
     history_week ;
 END/w/
 DELIMITER;
 CALL truncate_insert_sales_rank_toparow_week;

 DROP PROCEDURE IF EXISTS insert_update_sales_rank_toparow_week;
 DELIMITER /w/
 CREATE PROCEDURE insert_update_sales_rank_toparow_week ()
 BEGIN
 SET @wtab = ' sales_rank_toparow_week al ';
 SET @w = 10;
 WHILE @w < 110 DO
     SET @wfield = CONCAT('coin',@w);
     SET @wnewvalue = CONCAT('(SELECT sum_coin FROM grab_sales_rank_week da  WHERE  al.fk_country = da.country  AND al.fk_categoryid = da.categoryid   AND al.history_year = da.history_year  AND al.history_week = da.WeekValue  AND da.topx=',@w,' )');
     SET @wfieldb = CONCAT('amount',@w);
     SET @wnewvalueb = CONCAT('(SELECT sum_amount FROM grab_sales_rank_week da  WHERE  al.fk_country = da.country  AND al.fk_categoryid = da.categoryid   AND al.history_year = da.history_year  AND al.history_week = da.WeekValue  AND da.topx=',@w,' )');
     SET @wpre = CONCAT('UPDATE ',@wtab,' SET ',@wfield,'=',@wnewvalue,',',@wfieldb,'=',@wnewvalueb);
     PREPARE  stmt FROM @wpre ;
     EXECUTE  stmt  ;
     DROP PREPARE stmt;
 SET @w = @w + 10 ;
 END
 WHILE ;
 END/w/
 DELIMITER ;
 CALL insert_update_sales_rank_toparow_week;

 DROP PROCEDURE IF EXISTS truncate_insert_sales_rank_toparow_all;
 DELIMITER /w/
 CREATE PROCEDURE truncate_insert_sales_rank_toparow_all ()
 BEGIN
 TRUNCATE sales_rank_toparow_all ;
 INSERT INTO sales_rank_toparow_all (
     fk_country,
     fk_categoryid
 ) SELECT
     country,
     categoryid
 FROM
     grab_sales_rank_all
 GROUP BY
     country,
     categoryid;
 END/w/
 DELIMITER;
 CALL truncate_insert_sales_rank_toparow_all;

 DROP PROCEDURE IF EXISTS insert_update_sales_rank_toparow_all;
 DELIMITER /w/
 CREATE PROCEDURE insert_update_sales_rank_toparow_all ()
 BEGIN
 SET @wtab = ' sales_rank_toparow_all al ';
 SET @w = 10;
 WHILE @w < 110 DO
     SET @wfield = CONCAT('coin',@w);
     SET @wnewvalue = CONCAT('(SELECT sum_coin FROM grab_sales_rank_all da  WHERE  al.fk_country = da.country  AND al.fk_categoryid = da.categoryid AND da.topx=',@w,')');
     SET @wfieldb = CONCAT('amount',@w);
     SET @wnewvalueb = CONCAT('(SELECT sum_amount FROM grab_sales_rank_all da  WHERE  al.fk_country = da.country  AND al.fk_categoryid = da.categoryid AND da.topx=',@w,')');
     SET @wpre = CONCAT('UPDATE ',@wtab,' SET ',@wfield,'=',@wnewvalue,',',@wfieldb,'=',@wnewvalueb);
     PREPARE  stmt FROM @wpre ;
     EXECUTE  stmt  ;
     DROP PREPARE stmt;
 SET @w = @w + 10 ;
 END
 WHILE ;
 END/w/
 DELIMITER ;
 CALL insert_update_sales_rank_toparow_all;

 DROP PROCEDURE
 IF EXISTS `prepare_update`;
 DELIMITER /w/

 CREATE PROCEDURE `prepare_update` ()
 BEGIN

 SET @wtab = ' wtable ' ;
 SET @w = 10 ;
 WHILE @w < 40 DO

 SET @wfield = CONCAT('coin' ,@w) ;
 SET @wnewvalue = @w + 1 ;
 SET @wpre = CONCAT(
     'UPDATE ' ,@wtab,
     ' SET ' ,@wfield,
     '=' ,@wnewvalue
 ) ;
 PREPARE stmt FROM @wpre ;
 EXECUTE stmt ;
 DROP PREPARE stmt ;
 SET @w = @w + 10 ;
 END
 WHILE ;
 END/w/
 DELIMITER ;

 CALL `prepare_update`;

http://dev.mysql.com/doc/refman/5.7/en/sql-syntax-prepared-statements.html

 CREATE TABLE t1 (a INT NOT NULL);
 INSERT INTO t1 VALUES (4), (8), (11), (32), (80);
 SET @table = 't1';
 SET @s = CONCAT('SELECT * FROM ', @table);
 PREPARE stmt3 FROM @s;
 EXECUTE stmt3;

 SET @s = 'SELECT SQRT(POW(?,2) + POW(?,2)) AS hypotenuse';
 PREPARE stmt2 FROM @s;
 SET @a = 6;
 SET @b = 8;
 EXECUTE stmt2 USING @a, @b;

 PREPARE stmt1 FROM 'SELECT SQRT(POW(?,2) + POW(?,2)) AS hypotenuse';
 SET @a = 3;
 SET @b = 4;
 EXECUTE stmt1 USING @a, @b;
 SHOW VARIABLES LIKE '%a%';