MySQL 如何将数据导出到包含时间戳的CSV文件中？

有时，我们需要将数据导出到一个包含创建该文件的时间戳的CSV文件中。可以使用MySQL准备语句来完成。为了说明这一点，我们使用以下示例：

**示例 **

以下示例中的查询将数据从 “student_info” 表导出到带有时间戳的CSV文件中。

mysql> SET @time_stamp = DATE_FORMAT(NOW(),'_%Y_%m_%d_%H_%i_%s');
Query OK, 0 rows affected (0.00 sec)

mysql> SET @FOLDER = 'C:/mysql/bin/mysql-files';
Query OK, 0 rows affected (0.00 sec)

mysql> SET @FOLDER = 'C:/mysql/bin/mysql-files/';
Query OK, 0 rows affected (0.00 sec)

mysql> SET @PREFIX = 'Student15';
Query OK, 0 rows affected (0.00 sec)

mysql> SET @EXT = '.CSV';
Query OK, 0 rows affected (0.00 sec)

mysql> SET @Command = CONCAT("SELECT * FROM Student_info INTO OUTFILE '",@FOLDER, @PREFIX, @time_stamp, @EXT,"' FIELDS ENCLOSED BY '\"' TERMINATED BY ';'
ESCAPED BY '\"'"," LINES TERMINATED BY '\r  
';");
Query OK, 0 rows affected (0.00 sec)

mysql> PREPARE stmt FROM @command;
Query OK, 0 rows affected (0.00 sec)
Statement prepared

mysql> execute stmt;
Query OK, 6 rows affected (0.07 sec)

上面的查询将创建名为 “student_2017_12_10_18_52_46.CSV” 的CSV文件，即带有时间戳值的CSV文件，其数据如下：

101;"YashPal";"Amritsar";"History"
105;"Gaurav";"Chandigarh";"Literature"
125;"Raman";"Shimla";"Computers"
130;"Ram";"Jhansi";"Computers"
132;"Shyam";"Chandigarh";"Economics"
133;"Mohan";"Delhi";"Computers"

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