Question

我有两张桌子：

table_user
======================================
UID     UserName
1       UserA
2       UserB
3       UserC


table_score
==============================
UID     Date         Score
2       18/7/2013     100
2       19/7/2013     150

我需要将得分历史数据（数千行）批量插入table_score。历史数据仅包括UserName，Date和Score。

我正在做的是让我的PHP脚本从MySQL加载给定UserName的UID，将UID添加到批量插入SQL并将其发送回MySQL。这需要PHP和MySQL之间的2次通信。我再为其他用户重复上述内容。

是否可以让MySQL插入日期和分数，并在一个SQL中根据给定的UserName自动填写UID？

Answer 1

为MySql导入大量数据的最快方法是使用LOAD DATA INFILE

如果你有像这样的昏迷分隔文件

"UserB","18/7/2013",100
"UserB","19/7/2013",150
"UserC","20/7/2013",140

然后用这样的查询

加载它

LOAD DATA LOCAL INFILE '/path/to/your/file.csv' 
INTO TABLE table_score 
   FIELDS TERMINATED BY ',' OPTIONALLY ENCLOSED BY '"' 
   LINES TERMINATED BY '\n' -- or '\r\n' if it's Windows
(@username, @date, @score) 
SET uid =  
    (
      SELECT uid 
        FROM table_user 
       WHERE username = @username
       LIMIT 1
    ),
    date = STR_TO_DATE(@date, '%d/%m/%Y'),
    score = @score;

mysql批量插入从另一个表中引用ID

1 个答案: