MySQL批量更新不同表中的数据

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;