批量更新不同表的数据
下面为当时所编写的存储过程
本代码涉及到的MySQL的内容为
批量更新语句(UPDATE)
使用UPDATE语句实现批量修改
创建数据库‘bhl_tes’
创建表‘test_user’
批量插入记录
批量修改记录
批量更新不同表的数据今天翻到以前写的批量更新表中的数据的存储过程,故在此做一下记录。
当时MySQL中的表名具有如下特征,即根据需求将业务表类型分为了公有、私有和临时三种类型,即不同的业务对应三张表,而所做的是区分出是什么类型(公有、私有、临时)的业务表对数据的固定字段做统一规律的处理。
下面为当时所编写的存储过程BEGIN
DECLARE done INT;
DECLARE v_table_name VARCHAR(100);
DECLARE v_disable VARCHAR(100);
DECLARE v_disable_temp VARCHAR(100); -- 存放最终删除sql
DECLARE v_table_pre VARCHAR(100);
DECLARE v_table_sub VARCHAR(200);
DECLARE v_disable_temp_2 VARCHAR(100);
-- 查询testkaifa库中以'temp_test_p_'开头的表
DECLARE cursor_table_gis CURSOR FOR SELECT DISTINCT table_name tableName
FROM
information_schema.columns
WHERE
table_schema = 'testkaifa'
AND table_name LIKE '%temp_test_p_%';
DECLARE CONTINUE HANDLER FOR NOT FOUND SET done = 1;
SELECT @done;
OPEN cursor_table_gis;
cursor_loop:
LOOP
FETCH cursor_table_gis INTO v_table_name;
IF done = 1 THEN
LEAVE cursor_loop;
END IF;
-- 连接字符串函数
SET @v_disable = concat_ws(' ', 'update ', v_table_name, 'set is_valid=false where expire_time>now();');
SELECT @v_disable;
PREPARE sqlstr FROM @v_disable;
EXECUTE sqlstr;
DEALLOCATE PREPARE sqlstr;
SELECT substring_index(v_table_name, '_', 1)
INTO
v_table_pre;
-- IF v_table_pre = 'temp' THEN
SELECT reverse(left(reverse(v_table_name), instr(reverse(v_table_name), '_')))
INTO
v_table_sub;
SET @v_disable_temp = concat_ws(' ', 'update ', v_table_name, 'set is_valid=false where (expire_time-now())> (select value_data from ', concat('platform_params_p', v_table_sub), 'where param_key=\'tempDismissInterval\');');
SELECT @v_disable_temp;
PREPARE sqlstr2 FROM @v_disable_temp;
EXECUTE sqlstr2;
DEALLOCATE PREPARE sqlstr2;
-- END IF;
SET @v_disable_temp_2 = concat_ws(' ', 'update ', v_table_name, 'set is_valid=false where (test_id in(select test_id from ', concat('temp_test_user_p', v_table_sub), ' where (max(latest_act_time )-now())> (select value_data from ', concat('platform_params_p', v_table_sub), 'where param_key=\'tempDismissInterval\'));');
SELECT @v_disable_temp_2;
PREPARE sqlstr2 FROM @v_disable_temp;
EXECUTE sqlstr2;
DEALLOCATE PREPARE sqlstr2;
END LOOP cursor_loop;
CLOSE cursor_table_gis;
COMMIT;
--
END
本代码涉及到的MySQL的内容为
1.查询表名
SELECT DISTINCT table_name tableName
FROM
information_schema.columns
WHERE
table_schema = 'testkaifa'
AND table_name LIKE '%temp_test_p_%';
2.执行拼接的字符串SQL
PREPARE statement_name FROM sql_text /*定义*/
EXECUTE statement_name [USING variable [,variable...]] /*执行预处理语句*/
DEALLOCATE PREPARE statement_name /*删除定义*/
例如:
SET @v_disable_temp = concat_ws(' ', 'update ', v_table_name, 'set is_valid=false where (expire_time-now())> (select value_data from ', concat('platform_params_p', v_table_sub), 'where param_key=\'tempDismissInterval\');');
SELECT @v_disable_temp;
PREPARE sqlstr2 FROM @v_disable_temp;
EXECUTE sqlstr2;
DEALLOCATE PREPARE sqlstr2;
批量更新语句(UPDATE)
使用UPDATE语句实现批量修改
示例
下面创建一个名为‘bhl_tes’的数据库,并创建名为‘test_user’的表,字段分别为‘id’,‘age’,‘name’,’sex‘。
创建数据库‘bhl_tes’代码
CREATE DATABASE IF NOT EXISTS bhl_test;
查看结果
创建表‘test_user’代码
CREATE TABLE IF NOT EXISTS `test_user`(
`id` INT UNSIGNED AUTO_INCREMENT,
`name` VARCHAR(255) NOT NULL,
`age` INT(11) NOT NULL,
`sex` VARCHAR(16),
PRIMARY KEY ( `id` )
)ENGINE=InnoDB DEFAULT CHARSET=utf8;
查看结果
批量插入记录INSERT INTO test_user
(name, age, sex)
VALUES
('张三', 18, '男'),
('赵四', 17, '女'),
('刘五', 16, '男'),
('周七', 19, '女');
查看结果
批量修改记录UPDATE test_user SET
name = CASE id
WHEN 1 THEN '张三'
WHEN 2 THEN '李四'
WHEN 3 THEN '王五'
WHEN 4 THEN '小六'
END,
age = CASE id
WHEN 1 THEN 7
WHEN 2 THEN 8
WHEN 3 THEN 9
WHEN 4 THEN 14
END,
sex = CASE id
WHEN 1 THEN '男'
WHEN 2 THEN '男'
WHEN 3 THEN '男'
WHEN 4 THEN '男'
END
WHERE id IN (1,2,3,4);
查看结果
以上为个人经验,希望能给大家一个参考,也希望大家多多支持软件开发网。