delete-drop语句生成的存储过程

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');

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

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