Question

Marks_2017.csv

Name, class, Marks
"a1", 9, '{"Halfyr_T" : "45", "Halfyr_P" : "35", "Annual_T" : "42", "Annual_P" : "40"}'
"a2", 9, '{"Halfyr_T" : "45", "Halfyr_P" : "35", "Annual_T" : "42", "Annual_P" : "40"}'
"a3", 9, '{"Halfyr_T" : "45", "Halfyr_P" : "35", "Annual_T" : "42", "Annual_P" : "40"}'
"b1", 10, '{"Halfyr_T" : "45", "Halfyr_P" : "35", "Annual_T" : "42", "Annual_P" : "40"}'
"b2", 10, '{"Halfyr_T" : "45", "Halfyr_P" : "35", "Annual_T" : "42", "Annual_P" : "40"}'
"b3", 10, '{"Halfyr_T" : "45", "Halfyr_P" : "35", "Annual_T" : "42", "Annual_P" : "40"}'

Marks_2017_Update.csv

Name, class, Marks
"a1", 9, '{"Halfyr_T" : "-1", "Halfyr_P" : "-1", "Annual_T" : "-1", "Annual_P" : "-1", "Assignment" : "0"}'
"a2", 9, '{"Halfyr_T" : "-1", "Halfyr_P" : "-1", "Annual_T" : "-1", "Annual_P" : "-1", "Assignment" : "0"}'
"a3", 9, '{"Halfyr_T" : "-1", "Halfyr_P" : "-1", "Annual_T" : "-1", "Annual_P" : "-1", "Assignment" : "0"}'
"b1", 10, '{"Halfyr_T" : "0", "Halfyr_P" : "-1", "Annual_T" : "-1", "Annual_P" : "-1", "Assignment" : "0", "Quiz" : "-1"}'
"b2", 10, '{"Halfyr_T" : "0", "Halfyr_P" : "-1", "Annual_T" : "-1", "Annual_P" : "-1", "Assignment" : "0", "Quiz" : "-1"}'
"b3", 10, '{"Halfyr_T" : "0", "Halfyr_P" : "-1", "Annual_T" : "-1", "Annual_P" : "-1", "Assignment" : "0", "Quiz" : "-1"}'
"c1", 8, '{"Halfyr_T" : "0", "Halfyr_P" : "0", "Annual_T" : "0", "Annual_P" : "0", "Assignment" : "-1"}'
"c2", 8, '{"Halfyr_T" : "0", "Halfyr_P" : "0", "Annual_T" : "0", "Annual_P" : "0", "Assignment" : "-1"}'
"c3", 8, '{"Halfyr_T" : "0", "Halfyr_P" : "0", "Annual_T" : "0", "Annual_P" : "0", "Assignment" : "-1"}'

参考解决方案我试图遵循：

MySQL LOAD DATA INFILE with ON DUPLICATE KEY UPDATE

- ＆GT; key是name_class

- ＆GT;在插入Marks_2017（ON DUPLICATE KEY）期间，使用Marks_2017_Update，如果找到重复键

对于Marks_2017_update中的新json_key，不论＆＃34; 0＆＃34; /＆＃34; -1＆＃34;键值，将那些新的json_keys和json_value设置为＆＃34; 0＆＃34;。（例如： - 第9课的作业和第10课的作业和测验，在Marks_2017中设为＆＃34; 0＆＃34;
如果json_value是＆＃34; -1＆＃34;不要更改Marks_2017中的json_value（如果json_key已存在）。
将Marks_2017 json_key值重置为＆＃34; 0＆＃34;如果Marks_2017_update json_key值为＆＃34; 0＆＃34;对于现有密钥（即10级重置标记，Halfyr_T到＆＃34; 0＆＃34;在Marks_2017中，值为＆＃34; 0＆＃34;对于10级，在Halfs_T中为Marks_2017_Update）

- ＆GT;对于新密钥，请使用默认值＆＃34; 0＆＃34;将记录插入Marks_2017。（例如： - 对于第8课，Marks_2017_Update中的分配，值为＆＃34; -1＆＃34;，仍然，在Marks_2017中，它插入＆＃34; 0＆＃34;，因为它是一个新记录。）

在检查json_key并更新其值时主要面临问题。

尝试使用json_extract，json_set和json_merge。但无法解决我的要求。

- 创建db

CREATE SCHEMA IF NOT EXISTS `allmarks` DEFAULT CHARACTER SET utf8 ;
USE `allmarks` ;

- 根据csv文件的表模式

CREATE TABLE IF NOT EXISTS Marks_2017 (
  `Name` VARCHAR(255) NOT NULL,
  `class` INT(2) NOT NULL,
  `Marks` JSON NOT NULL,
  UNIQUE INDEX `Marks_2017_index` (`Name` ASC, `class` ASC));

- 粘贴上述输出路径中的文件显示变量类似于＆＃34; secure_file_priv＆＃34 ;;

- 将csv_file数据导入表

LOAD DATA INFILE 'C:/ProgramData/MySQL/MySQL Server 8.0/Uploads/Marks_2017.csv' 
INTO TABLE Marks_2017 
FIELDS TERMINATED BY ','
OPTIONALLY ENCLOSED BY '\''
LINES TERMINATED BY '\r\n'
IGNORE 1 ROWS;

- 将csv_file数据导入更新表以更新主数据

CREATE TEMPORARY TABLE Marks_2017_Update SELECT * FROM Marks_2017 WHERE 1=0; -- where 1=0 will drop all the existing indexes

LOAD DATA INFILE 'C:/ProgramData/MySQL/MySQL Server 8.0/Uploads/Marks_2017_Update.csv' 
INTO TABLE Marks_2017_Update 
FIELDS TERMINATED BY ','
OPTIONALLY ENCLOSED BY '\''
LINES TERMINATED BY '\r\n'
IGNORE 1 ROWS;

使用csv文件

0 个答案: