问题：
有时，您需要在开发过程中操作许多表。
[En]
Sometimes you need to manipulate many tables during development.
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');
delete_drop_sql语句生成器
打印删除所有存储过程和数据库函数语句的存储过程
[En]
Print a stored procedure that deletes all stored procedures and database function statements
print_drop_all_proc_sql(
in_dbname [数据库名字 ]
）
1 -- 生成删除所有存储过程和函数的语句
2 -- -- powered by wanglifeng https://www.cnblogs.com/wanglifeng717
3 DELIMITER $$
4 DROP PROCEDURE IF EXISTS print_drop_all_proc_sql$$
5 CREATE PROCEDURE print_drop_all_proc_sql(in_dbname VARCHAR(200))
6 BEGIN
7 DECLARE var_count INT;
8 DECLARE var_name VARCHAR(200);
9 DECLARE var_type VARCHAR(200);
10
11 -- 获取所有的存储过程和函数
12 DECLARE pro_funcs CURSOR FOR SELECT routine_name,routine_type FROM information_schema.routines WHERE routine_schema = in_dbname;
13 SELECT COUNT(*) INTO var_count FROM information_schema.Routines WHERE routine_schema = in_dbname;
14 OPEN pro_funcs;
15 SET FOREIGN_KEY_CHECKS = 0;
16 SET @pro_func=NULL;
17 loop_i:LOOP
18 IF var_count = 0 THEN
19 LEAVE loop_i;
20 END IF;
21 FETCH pro_funcs INTO var_name,var_type;
22 -- 必须用concat_ws,不然有null,拼出来全部是空。char(10)或者"\r\n都可以"
23 SET @pro_func=CONCAT_WS('',@pro_func,' drop ',var_type, ' ',in_dbname,'.',var_name,';',"\r\n");
24
25 SET var_count = var_count - 1;
26 END LOOP;
27 CLOSE pro_funcs;
28 SET FOREIGN_KEY_CHECKS = 1;
29 SELECT @pro_func;
30 END$$
31 DELIMITER ;
print_drop_all_proc_sql存储过程
本文来自博客园，作者：wanglifeng，转载请注明原文链接：https://www.cnblogs.com/wanglifeng717/p/15838755.html
Original: https://www.cnblogs.com/wanglifeng717/p/15838755.html
Author: 王李峰
Title: delete-drop语句生成的存储过程
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