Update specific column in MySQL from CSV - mysql

Question

I am looking to import data from a CSV file into MySQL. The CSV is roughly 100 lines and looks as follows.
data1,num1
data2,num2
The MySQL database looks as follows.
<th>aaa </th>|<th>b</th>|<th>c</th>|<th>...</th>|<th>ggg</th>|
----|-|-|---|---|
<td>data</td>|<td>*</td>|<td>*</td>|<td>...</td>|<td>num</td>|
What I am looking to do is find data1 in the MySQL table and replace num with num1 on that line, and to do this for each line in the CSV.
My database knowledge is on the lower end so any help would be appreciated.
**UPDATE
Here is where I am sitting at now. I cannot seem to get this to update more than the first line from the .csv file.
DROP TEMPORARY TABLE IF EXISTS tempTable;
CREATE TEMPORARY TABLE tempTable
(`data` varchar(20) NOT NULL,
`num` varchar(20) NOT NULL
);
LOAD DATA LOCAL INFILE 'file.csv'
INTO TABLE tempTable
FIELDS TERMINATED BY ','
LINES TERMINATED BY '\r\n';
UPDATE DBTable t1
JOIN tempTable t2 ON t1.data = t2.data
SET t1.num = t2.num;
DROP TEMPORARY TABLE tempTable;

Answer 1

You could load CSV file into a new table, then extract data with a JOIN.
Create a temporary table; try to use for data same data type you have on your table.
CREATE TABLE IF NOT EXISTS `temp_table_csv` (
`data` char(20) NOT NULL,
`num` bigint(20) NOT NULL
);
Then load CSV into this new temporary table; we suppose your CSV file has columns header.
LOAD DATA INFILE 'csvfile.csv'
INTO TABLE `temp_table_csv`
FIELDS TERMINATED BY ','
ENCLOSED BY '"'
LINES TERMINATED BY '\r\n'
IGNORE 1 LINES;
Then make a JOIN and write into a file.
SELECT `sx`.`data`, `dx`.`num`
FROM `temp_table_csv` AS `sx` INNER JOIN `datatable` AS `dx`
ON `dx`.`data` = `sx`.`data`
INTO OUTFILE 'newcsv.csv'
FIELDS TERMINATED BY ','
ENCLOSED BY '"'
LINES TERMINATED BY '\n';
At last you can remove temporary table previously created.
DROP TABLE `temp_table_csv`;