百木园问题：
开发时有时候需要对很多表进行操作。
例如：清空(删除)所有(某些)表，删除所有表某时间点之后导入的数据(类似于回滚)
解决方式：
对选定的表集合执行相同的查询条件(可为空)，如果这个执行结果大于阈值，则使用相同的条件组建delete语句。
delete_drop_sql生成器用法： delete_drop_sql_generator (var_where [where条件，可以为空,例如：\" where LEFT(CREATE_time,19)>\'2021-08-04\'\"] ,var_include_tbl_list [要包含的表名列表,优先于var_exclude_tbl_list,例如：\"tbl_name1,tbl_name2\"] ,var_exclude_tbl_list [要排除的表名列表,仅在var_include_tbl_list为空时生效,例如：\"tbl_name1,tbl_name2\"] ,var_greater_than_value [符合where条件要过滤的值,count(*)>=0 ] )
1 -- -- powered by wanglifeng https://www.cnblogs.com/wanglifeng717
2 DROP PROCEDURE IF EXISTS delete_drop_sql_generator;
3 DELIMITER %%
4 CREATE PROCEDURE delete_drop_sql_generator(var_where VARCHAR(2048),var_include_tbl_list VARCHAR(2048),var_exclude_tbl_list VARCHAR(2048),var_greater_than_value VARCHAR(100))
5 label:BEGIN
6
7 /*------------每个表使用同样的过滤条件---------------------------------*/
8 /*
9 -- -- powered by wanglifeng https://www.cnblogs.com/wanglifeng717
10 适用场景：
11 1.将所有表2021-08-01日插入的记录全部删除。例如刚配置业务数据全部删除，只要确定某个时间段，只有你的数据在里面
12
13 2.将某些表相同字段的记录删除，自定义哪些表，必须同时含有where条件中的字段。
14 */
15 DROP TABLE if exists temp_filter_table;
16 DROP TABLE if exists temp_var_query_table;
17 CREATE table temp_var_query_table(tbl_name VARCHAR(512));
18
19 /*-----------------------------------------------------------------------------*/
20 -- ----------配置项目-----------
21 -- -- powered by wanglifeng https://www.cnblogs.com/wanglifeng717
22 /*-----------------------------------------------------------------------------*/
23 SET @var_where = var_where;
24 -- \"LEFT(create_time,19)>\'2021-08-04\'\";-- 格式：2021-08-11 16:32:37.872
25 -- select @var_where;
26
27 -- 如果含有include，则已include为准。
28 if(var_include_tbl_list IS NULL OR var_include_tbl_list=\'include_tbl_list\' OR var_include_tbl_list=\'\' OR var_include_tbl_list=\' \' OR var_include_tbl_list=\' \') then
29 if(var_exclude_tbl_list IS NULL OR var_exclude_tbl_list=\'exclude_tbl_list\' OR var_exclude_tbl_list=\'\' OR var_exclude_tbl_list=\' \' OR var_exclude_tbl_list=\' \') then
30 -- 如果包含和不含字段都是为空，将库中所有的表加入进去。
31 INSERT INTO temp_var_query_table SELECT t.table_name FROM information_schema.tables t WHERE table_schema=DATABASE() AND t.TABLE_NAME !=\'temp_var_query_table\';
32 else
33 -- 如果include为空，但是exclude不为空
34 SET @exec_sql = CONCAT_WS(\'\',\"INSERT INTO temp_var_query_table SELECT t.table_name FROM information_schema.tables t WHERE table_schema=DATABASE() AND t.TABLE_NAME not in (\'\", REPLACE(var_exclude_tbl_list, \',\',CONCAT_WS(\'\',\"\',\'\")),\"\')\");
35 PREPARE stmt FROM @exec_sql;
36 EXECUTE stmt;
37 DEALLOCATE PREPARE stmt;
38 END if;
39 ELSE
40 -- 插入静态字段
41 SET @exec_sql = CONCAT_WS(\'\',\"INSERT INTO temp_var_query_table SELECT t.table_name FROM information_schema.tables t WHERE table_schema=DATABASE() AND t.TABLE_NAME in (\'\", REPLACE(var_include_tbl_list, \',\',CONCAT_WS(\'\',\"\',\'\")),\"\')\");
42 PREPARE stmt FROM @exec_sql;
43 EXECUTE stmt;
44 DEALLOCATE PREPARE stmt;
45 END if;
46
47 -- select @exec_sql;
48
49 -- 自定义查找，如果自定义查找，请注释掉上面默认的全库查找
50
51 -- INSERT INTO temp_query_table VALUES (\'tbl_act_class\'), (\'tbl_act_info\');
52
53
54 /*-----------------------------------------------------------------------------*/
55 /*---------------------配置项结束--------------------------------------*/
56 -- -- powered by wanglifeng https://www.cnblogs.com/wanglifeng717
57 /*-----------------------------------------------------------------------------*/
58
59
60 SET group_concat_max_len = 4294967295;
61
62 -- select count(*) as \"条数\",\"tbl_cbm_app_entrance\" as \"表名\",\"select count(*) from tbl_cbm_app_entrance where LEFT(CREATE_time,19)>\'2021-08-04\'\" as \"执行的脚本\" from tbl_cbm_app_entrance where LEFT(CREATE_time,19)>\'2021-08-04\'
63 SET @query_code=\'
64 select (@row_id:=@row_id+1) as \"序号\", count(*) as \"num\",\"@tbl_name\" as \"tbl_name\",\"select count(*) from @tbl_name @var_where ;\" as \"执行的脚本\" from @tbl_name, (select @row_id:=0 ) t @var_where
65 \';
66 SELECT REPLACE(@query_code,\'@var_where\',@var_where) INTO @query_code;
67
68 SELECT GROUP_CONCAT(
69 t.temp SEPARATOR \'\\r\\n union all \\r\\n\') INTO @var_query_sql
70 FROM
71 (
72 SELECT
73 REPLACE(@query_code,\'@tbl_name\',t.TABLE_NAME) as temp
74 FROM information_schema.tables t
75 WHERE table_schema=DATABASE() AND t.table_name IN( SELECT * FROM temp_var_query_table WHERE tbl_name NOT IN(\'temp_var_query_table\'))
76 ) t;
77
78 -- select @var_query_sql;
79
80 SET @exe_sql = @var_query_sql;
81 PREPARE stmt FROM @exe_sql;
82 EXECUTE stmt;
83 DEALLOCATE PREPARE stmt;
84
85
86 -- 组成建表语句
87 /*create table temp_var_tbl_name as
88 select t.tbl_name from
89 (select count(*) as num, \'tbl_act_black_white_list\' as tbl_name from tbl_act_black_white_list where LEFT(CREATE_time,19)>\'2021-08-04\'
90 union all
91 select count(*) as num, \'tbl_act_card_group\' as tbl_name from tbl_act_card_group where LEFT(CREATE_time,19)>\'2021-08-04\'
92 ) t where t.num>=1;
93 */
94
95 DROP TABLE if exists temp_filter_table;
96 SET @exe_sql = CONCAT_WS(\'\',\'create table temp_filter_table as select t.tbl_name from (\',@var_query_sql,\') t where t.num>=\',var_greater_than_value);
97
98 PREPARE stmt FROM @exe_sql;
99 EXECUTE stmt;
100 DEALLOCATE PREPARE stmt;
101
102 -- select @exe_sql;
103
104
105
106 SELECT CONCAT(
107 \'SET FOREIGN_KEY_CHECKS = 0;\',
108 \'\\r\\n\',
109 GROUP_CONCAT(
110 CONCAT(\'drop table \',\' \',tbl_name,\'; \')
111 SEPARATOR \'\\r\\n\'
112 ),
113 \'\\r\\n\',
114 \'SET FOREIGN_KEY_CHECKS = 1;\'
115 ) INTO @drop_sql_code
116 FROM temp_filter_table;
117
118 SELECT CONCAT(
119 \'SET FOREIGN_KEY_CHECKS = 0;\',
120 \'\\r\\n\',
121 GROUP_CONCAT(
122 CONCAT_WS(\'\',\'delete from \',tbl_name,\' \',@var_where,\';\')
123 SEPARATOR \'\\r\\n\'
124 ),
125 \'\\r\\n\',
126 \'SET FOREIGN_KEY_CHECKS = 1;\'
127 ) INTO @delete_sql_code
128 FROM temp_filter_table;
129
130 SELECT CONCAT(
131 \'SET FOREIGN_KEY_CHECKS = 0;\',
132 \'\\r\\n\',
133 GROUP_CONCAT(
134 CONCAT_WS(\'\',\'select * from \',tbl_name,\' \',@var_where,\';\')
135 SEPARATOR \'\\r\\n\'
136 ),
137 \'\\r\\n\',
138 \'SET FOREIGN_KEY_CHECKS = 1;\'
139 ) INTO @select_sql_code
140 FROM temp_filter_table;
141
142 SELECT \'代码\',\'作用\' LIMIT 0
143 UNION ALL
144 SELECT @select_sql_code ,\'查询语句\'
145 UNION ALL
146 SELECT @delete_sql_code,\'删除语句\'
147 UNION ALL
148 SELECT @drop_sql_code ,\'drop表语句\';
149
150 DROP TABLE if exists temp_filter_table;
151 DROP TABLE if exists temp_var_query_table;
152 END %%
153 DELIMITER ;
154
155 -- SELECT * from temp_var_query_table;
156
157 -- CALL delete_drop_sql_generator(\" where LEFT(CREATE_time,19)>\'2021-08-04\'\",\'\',\'\',\'0\');
来源：https://www.cnblogs.com/wanglifeng717/p/15838755.html
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