12年过去了，还没有人发帖回答下面这个问题:

我想从MySQL数据库的所有表中搜索给定字符串的所有字段

答案包括gui、模糊的概念、语法错误、需要表名或前缀的过程以及各种扭曲。下面是一个实际的、有效的、经过测试的、简单易用的答案，它建立在多个先前的答案的基础上，同时还将主键添加到结果中。

DROP PROCEDURE IF EXISTS findAll;
DELIMITER $$
CREATE PROCEDURE findAll( IN `search` TEXT )
BEGIN
    SET SESSION group_concat_max_len := @@max_allowed_packet;
    SELECT GROUP_CONCAT(
        "SELECT '", c1.TABLE_NAME, "' AS `table`, '", c1.COLUMN_NAME, "' AS `column`, ",
        "CONCAT_WS(',', ",  (SELECT GROUP_CONCAT(c2.column_name) FROM `information_schema`.`columns` c2 WHERE c1.TABLE_SCHEMA=c2.TABLE_SCHEMA AND c1.TABLE_NAME=c2.TABLE_NAME AND c2.COLUMN_KEY='PRI') ,") AS pri,", 
        c1.COLUMN_NAME, " AS value FROM ", c1.TABLE_NAME,
      " WHERE `",c1.COLUMN_NAME,"` LIKE '%", search, "%'" SEPARATOR "\nUNION\n") AS col 
    INTO @sql   
    FROM information_schema.columns c1 
    WHERE c1.TABLE_SCHEMA = DATABASE();
  PREPARE stmt FROM @sql;
  EXECUTE stmt;
  DEALLOCATE PREPARE stmt;
END $$
DELIMITER ;

就是这样。你现在可以调用findAll('foobar');

不除外。你会遇到两个问题:

MySQL错误1436:线程堆栈溢出 准备好的语句需要重新准备。

将以下两行添加到/etc/mysql/mysql.conf.d/mysqld.cnf或任何你的cnf所在的地方，或者将它们保存在一个单独的文件中并复制到conf.d目录。

thread_stack            = 2M
table_definition_cache  = 5000

是的，显然这不应该在生产环境中运行，因为它不安全，而且会降低您的性能。

即使下面的建议不应该被认为是最终的解决方案，你也可以通过这样做来实现目标:

SET SESSION group_concat_max_len = 1000000;
SET @search = 'Text_To_Search';

DROP table IF EXISTS table1;
CREATE TEMPORARY TABLE table1 AS 
(SELECT 
    CONCAT('SELECT \'',TABLE_NAME,'\' as \'table_name\',\'',COLUMN_NAME,'\' as \'column_name\',CONVERT(count(*),char) as \'matches\' FROM `',
    TABLE_NAME,'` where `',COLUMN_NAME,'` like \'%',@search,'%\' UNION ') as 'query'
FROM INFORMATION_SCHEMA.COLUMNS WHERE TABLE_SCHEMA = 'db_name' limit 1000000);

set @query = (SELECT GROUP_CONCAT(t1.`query` SEPARATOR '') as 'final_query' from table1 t1 limit 1);
set @query = (SELECT SUBSTRING(@query, 1, length(@query) - 7));

PREPARE stmt FROM @query;
EXECUTE stmt;
DEALLOCATE PREPARE stmt;

请记住:

选项:group_concat_max_len和limit 1000000并不总是必需的，这将取决于您的服务器/IDE配置。以防我加进去。 执行此命令后，您将得到一个3列响应:[table_name]， [column_name]， [matches] 列'matches'是给定表/列中出现的次数。 这个查询非常快。

免责声明:它只对个人使用有用，换句话说，请不要在生产系统中使用它，因为考虑到搜索参数与其他字符串连接，它对SQL注入攻击很敏感。 如果你想创建一个prod. ready函数，那么你需要创建一个带有LOOP的存储过程。

12年过去了，还没有人发帖回答下面这个问题:

我想从MySQL数据库的所有表中搜索给定字符串的所有字段

答案包括gui、模糊的概念、语法错误、需要表名或前缀的过程以及各种扭曲。下面是一个实际的、有效的、经过测试的、简单易用的答案，它建立在多个先前的答案的基础上，同时还将主键添加到结果中。

DROP PROCEDURE IF EXISTS findAll;
DELIMITER $$
CREATE PROCEDURE findAll( IN `search` TEXT )
BEGIN
    SET SESSION group_concat_max_len := @@max_allowed_packet;
    SELECT GROUP_CONCAT(
        "SELECT '", c1.TABLE_NAME, "' AS `table`, '", c1.COLUMN_NAME, "' AS `column`, ",
        "CONCAT_WS(',', ",  (SELECT GROUP_CONCAT(c2.column_name) FROM `information_schema`.`columns` c2 WHERE c1.TABLE_SCHEMA=c2.TABLE_SCHEMA AND c1.TABLE_NAME=c2.TABLE_NAME AND c2.COLUMN_KEY='PRI') ,") AS pri,", 
        c1.COLUMN_NAME, " AS value FROM ", c1.TABLE_NAME,
      " WHERE `",c1.COLUMN_NAME,"` LIKE '%", search, "%'" SEPARATOR "\nUNION\n") AS col 
    INTO @sql   
    FROM information_schema.columns c1 
    WHERE c1.TABLE_SCHEMA = DATABASE();
  PREPARE stmt FROM @sql;
  EXECUTE stmt;
  DEALLOCATE PREPARE stmt;
END $$
DELIMITER ;

就是这样。你现在可以调用findAll('foobar');

不除外。你会遇到两个问题:

MySQL错误1436:线程堆栈溢出 准备好的语句需要重新准备。

将以下两行添加到/etc/mysql/mysql.conf.d/mysqld.cnf或任何你的cnf所在的地方，或者将它们保存在一个单独的文件中并复制到conf.d目录。

thread_stack            = 2M
table_definition_cache  = 5000

是的，显然这不应该在生产环境中运行，因为它不安全，而且会降低您的性能。

如果您不是在代码级别上使用它，只是想检查信息，您可以将整个数据库导出为SQL，然后在文本编辑器上搜索。

这个解决方案 a)只有MySQL，不需要其他语言，并且 b)返回SQL结果，准备处理!

#Search multiple database tables and/or columns
#Version 0.1 - JK 2014-01
#USAGE: 1. set the search term @search, 2. set the scope by adapting the WHERE clause of the `information_schema`.`columns` query
#NOTE: This is a usage example and might be advanced by setting the scope through a variable, putting it all in a function, and so on...

#define the search term here (using rules for the LIKE command, e.g % as a wildcard)
SET @search = '%needle%';

#settings
SET SESSION group_concat_max_len := @@max_allowed_packet;

#ini variable
SET @sql = NULL;

#query for prepared statement
SELECT
    GROUP_CONCAT("SELECT '",`TABLE_NAME`,"' AS `table`, '",`COLUMN_NAME`,"' AS `column`, `",`COLUMN_NAME`,"` AS `value` FROM `",TABLE_NAME,"` WHERE `",COLUMN_NAME,"` LIKE '",@search,"'" SEPARATOR "\nUNION\n") AS col
INTO @sql
FROM `information_schema`.`columns`
WHERE TABLE_NAME IN
(
    SELECT TABLE_NAME FROM `information_schema`.`columns`
    WHERE
        TABLE_SCHEMA IN ("my_database")
        && TABLE_NAME IN ("my_table1", "my_table2") || TABLE_NAME LIKE "my_prefix_%"
);

#prepare and execute the statement
PREPARE stmt FROM @sql;
EXECUTE stmt;
DEALLOCATE PREPARE stmt;

使用实例在CLI下搜索数据库所有表中的字符串。

mysqldump -u UserName --no-create-info --extended-insert=FALSE DBName -p | grep -i "searchingString"

Or,

mysqldump -u UserName --no-create-info --extended-insert=FALSE DBName -p | grep -i "searchingString" > searchingString.sql