筆記 mysql 匯出查詢結果

語法：

the select ... into outfile 'file_name' [options] form of select writes the selected rows to a file.

select

*from
students
into outfile '
test/users.csv
'fields terminated by'
,' optionally enclosed by'"
'--fields separated by commas and enclosed within double quotation marks
lines terminated by
'\r\n
'

注意：1、該語法只能在mysql伺服器上執行；

2、資料檔案的儲存位置與file_name指定的值相關。

其中，資料夾需要手動建立，檔案不能為已存在的檔案

原因： /不懂哇~

file_namecannot be an existing file, which among other things prevents files such as/etc/passwdand database tables from being destroyed. 

當前庫：

select

database(); --
mydemo

資料檔案儲存位置：

select

@@datadir;  --
d:\programs\mysql\data\
--show variables like 'datadir'

示例：1、」fname」 - %datadir%/

file_name='users.csv'

file_path= d:\programs\mysql\data\mydemo\

2、」/fname」 – rootd_%datadir%/

file_name='/users.csv'

file_path=d:\

3、」folder_name/fname」 – %datadir%/folder_name

file_name='test/users.csv'

file_path= d:\programs\mysql\data\test\

其中，此處報錯：can't create/write to file 'd:\programs\mysql\data\test\users.csv' (errcode: 2)

根據錯誤編號errcode，定位錯誤原因：需要手動建立資料夾 test

> perror 2os error code   2:  no such file or directory

4、」/folder_name /fname」 – rootd_%datadir%/folder_name

file_name='/test/users.csv'

file_path= d:\test\

匯入外部檔案

load data infile '

test/users.csv
'replace
into
table
students
fields terminated by'
,' optionally enclosed by'"
'lines terminated by'
\r\n
'

參考：

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