Question

如何查看数据库中的所有表格，因为我想找到特定数量的UserId，其中X - 它是一个数字UserId示例X = 2所以我必须找到UserId = 2

我使用MySQL，我想要创建程序

我的数据库架构：

Something ( ... ) --> without UserId
Something1 (... , UserId,...)
Something2 (... , UserId,...)
Something3 (... , UserId,...)
Cat
Cat1
Cat2
Cat3
Cat4
etc....

没有数字的表格可能我们称PARENT和表格为数字示例（Cat1，Cat2 ... Cat3 ..）我们称之为CHILDREN＆gt;

当我们在一个表中获得20000条记录时，动态创建了CHILDREN

我想要调用过程示例：CALL SearchUser（X）其中X - UserId的数量

如果有人有剧本，我会很感激，或者如果有人帮助我

Answer 1

不确定这是否有效。请试一试。这里的数据库名称是硬编码WHERE TABLE_SCHEMA IN ('test')

## 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),in_column_name 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 `', in_column_name,'` = "',in_search,'"') ,table_schema,table_name,column_name FROM information_schema.COLUMNS WHERE TABLE_SCHEMA IN ('test') and column_name=in_column_name ;
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;

END $$
DELIMITER ;

临时表结构：

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;

通话程序：

call get_table('2','userID');
select * from temp_details;

如何浏览数据库中的所有表用户ID - X.过程

1 个答案: