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有时我们需要将数据导出到 CSV 文件中，该文件的名称带有创建该文件的时间戳。这可以借助 MySQL 准备好的语句来完成。为了说明这一点，我们使用以下示例 - 示例 以下示例中的查询会将数据从表“student_info”导出到名称中包含时间戳的 CSV 文件。 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)登录后复制 上述查询将创建名为“student_2017_12_10_18_52_46.CSV”的 CSV 文件，即带有时间戳值的 CSV 文件，具有以下数据 - 101;"YashPal";"Amritsar";"History"
105;"Gaurav";"Chandigarh";"Literature"
125;"Raman";"Shimla";"Computers"
130;"Ram";"Jhansi";"Computers"
132;"Shyam";"Chandigarh";"Economics"
133;"Mohan";"Delhi";"Computers" 登录后复制 |
