以下的文章主要介紹的是MySQL數據庫在眾多表中進行表名與字段名的查詢的實際操作步驟，以及對實現其查詢所要用到的SQL 語句的介紹，還有兩個實際解決方案的描述，以下就是文章的主要內容描述。

在MySQL 眾多表中查找一個表名或者字段名的 SQL 語句：

SELECT?table_name,?column_name?from?information_schema.columns?WHERE?column_name?LIKE?'Name';?

SELECT TABLE_NAME ?FROM information_schema.`TABLES` WHERE TABLE_NAME LIKE '%_click' OR TABLE_NAME LIKE '%_open' OR TABLE_NAME LIKE '%_reg' AND table_schema = 'ad_flow';

MySQL數據庫在眾多表中查詢表名和字段名，下面兩種方法也可以查到：

SELECT?column_name?from?information_schema.columns?WHERE?column_name?LIKE?’
%searchTerm%’?AND?table_schema?=?‘yourDB’ ?

SELECT?column_name?from?information_schema.columns?WHERE?column_name?LIKE?’
%searchTerm%’?AND?table_schema?=?‘yourDB’?AND?table_name?=?‘yourDBTable’ ?

這樣，我們在面多突然出現的那么多表時，就不會茫然失措了。

?

變量做表名 執行sql存儲過程中會吧變量當做表名 所以得用預處理做

BEGIN
#Routine body goes here...
DECLARE ad_id INT;
DECLARE _done INT DEFAULT 0;
DECLARE ad_click INT DEFAULT 0;
DECLARE ad_open INT DEFAULT 0;#ip
DECLARE ad_reg INT DEFAULT 0;
DECLARE today INT;


DECLARE _cur CURSOR FOR
SELECT id FROM 027game.games_ad;

DECLARE CONTINUE HANDLER FOR SQLSTATE '02000' SET _done = 1;

OPEN _cur;
REPEAT
FETCH _cur INTO ad_id;
IF NOT _done THEN
#查詢id_click
SET @tmp_tablename = CONCAT('ad_flow.',ad_id,'_click');
SET @tmp_sql = CONCAT("SELECT COUNT(id) INTO @tmp_count1 FROM ",@tmp_tablename);
PREPARE stmt FROM @tmp_sql;
EXECUTE stmt;
DEALLOCATE PREPARE stmt;
SET ad_click = @tmp_count1;

#查詢id_open
SET @tmp_tablename = CONCAT('ad_flow.',ad_id,'_open');
SET @tmp_sql = CONCAT("SELECT COUNT(DISTINCT(ip)) INTO @tmp_count2 FROM ",@tmp_tablename);
PREPARE stmt FROM @tmp_sql;
EXECUTE stmt;
DEALLOCATE PREPARE stmt;
SET ad_open = @tmp_count2;

#查詢id_reg
SET @tmp_tablename = CONCAT('ad_flow.',ad_id,'_reg');
SET @tmp_sql = CONCAT("SELECT COUNT(id) INTO @tmp_count3 FROM ",@tmp_tablename);
PREPARE stmt FROM @tmp_sql;
EXECUTE stmt;
DEALLOCATE PREPARE stmt;
SET ad_reg = @tmp_count3;

SET today = UNIX_TIMESTAMP(CURDATE());
#執行檢查 看是更新還是插入 如果有數據 就進行更新 如果沒有則插入

SET @tmp_sql = CONCAT("SELECT COUNT(id) INTO @ishave FROM 027game.games_ad_stat"," WHERE ad_id = ",ad_id," AND date =",today);
PREPARE stmt FROM @tmp_sql;
EXECUTE stmt;
DEALLOCATE PREPARE stmt;


#執行插入或更新
IF NOT @ishave THEN
SET @tmp_sql = "INSERT INTO 027game.games_ad_stat (date,ip,click,reg,ad_id) VALUES (?,?,?,?,?)";
SET @a = today;
SET @b = ad_open;
SET @c = ad_click;
SET @d = ad_reg;
SET @e = ad_id;
PREPARE stmt FROM @tmp_sql;
EXECUTE stmt USING @a,@b,@c,@d,@e;
DEALLOCATE PREPARE stmt;

ELSE
SET @tmp_sql = "UPDATE 027game.games_ad_stat SET ip=?,click=?,reg=? WHERE ad_id = ? AND date = ?";
SET @a = ad_open;
SET @b = ad_click;
SET @c = ad_reg;
SET @d = ad_id;
SET @e = today;
PREPARE stmt FROM @tmp_sql;
EXECUTE stmt USING @a,@b,@c,@d,@e;
DEALLOCATE PREPARE stmt;

END IF;
END IF;
UNTIL _done END REPEAT;

CLOSE _cur;

END

?

?

?

BEGINDECLARE tablename VARCHAR(50);DECLARE _done INT DEFAULT 0;#Routine body goes here...#定義循環光標DECLARE _cur CURSOR FORSELECT TABLE_NAME FROM information_schema.`TABLES` WHERE (TABLE_NAME LIKE '%_click' OR TABLE_NAME LIKE '%_open' OR TABLE_NAME LIKE '%_reg') AND table_schema = 'ad_flow';#定義循環結束標記DECLARE CONTINUE HANDLER FOR SQLSTATE '02000' SET _done = 1;OPEN _cur;#開始循環REPEATFETCH _cur INTO tablename ;IF NOT _done THENSET @clearsql = CONCAT('TRUNCATE ',tablename);PREPARE stmt FROM @clearsql;EXECUTE stmt;END IF;UNTIL _done END REPEAT;CLOSE _cur; END

轉載于:https://www.cnblogs.com/lost-1987/articles/2737037.html

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