Question

下午好，

我使用INTO OUTFILE创建一个带有SELECT信息的CSV文件。我需要使用变量来个性化CSV的名称。

例如，我想添加日期NOW（）。

这是一个想法（但它不起作用）：

run

Anyonw知道它是否可能？感谢

Answer 1

唯一的方法是使用PREPARE STATEMENT

// You can set your VARS or use it direcly in the CONCAT
SET @outpath = "out/";
SET @outfile = (SELECT NOW());
SET @outextension = "_EMAIL_WithoutEmail.csv";

// GENERATE your QUERY with CONCAT into @SQL
SELECT CONCAT("SELECT * FROM `vn_db_tmp` INTO OUTFILE ",@outpath,@outfile,@outextension,'....') INTO @SQL;
PREPARE stmt FROM @SQL;
EXECUTE stmt;
DEALLOCATE PREPARE stmt;

Answer 2

一种选择是使用13.5 Prepared SQL Statement Syntax。

示例：

...

SET @`outfull` := CONCAT('out/', NOW(), '_EMAIL_WithoutEmail.csv');    
SET @`qry` := CONCAT('SELECT * 
                        INTO OUTFILE \'', @`outfull`, '\' 
                        FIELDS TERMINATED BY \';\' 
                        ENCLOSED BY \'"\' 
                        LINES TERMINATED BY \'\n\' 
                      FROM `vn_db_tmp`');    
PREPARE `stmt` FROM @`qry`;
SET @`qry` := NULL;
EXECUTE `stmt`;
DEALLOCATE PREPARE `stmt`;
...

Answer 3

把它留在那里。为避免 outfile 出现问题，您必须使用“文件路径”。 ' 特殊符号使用反斜杠+'。

SET @outfull = CONCAT('\'/path/to/file/', date_format (NOW(),'%Y-%m-%d_%H:%i:%s'), '_app.log\'');    
SET @SQL = CONCAT("SELECT * FROM some_table INTO OUTFILE ",@outfull);    
PREPARE stmt FROM @SQL;
EXECUTE stmt;
DEALLOCATE PREPARE stmt;

mysq - 当SELECT * INTO OUTFILE（在文件名上）时使用变量（日期）

3 个答案: