SELECT INTO OUTFILE
语法
SELECT ... INTO OUTFILE 'file_name' [CHARACTER SET charset_name] [export_options] export_options: [{FIELDS | COLUMNS} [TERMINATED BY 'string'] [[OPTIONALLY] ENCLOSED BY 'char'] [ESCAPED BY 'char'] ] [LINES [STARTING BY 'string'] [TERMINATED BY 'string'] ]
描述
SELECT ... INTO OUTFILE
语句将结果集写入到文件中,并且允许人为指定导出数据时的字段分隔符和行分隔符。
导出的文件必须不能已经存在,它无法覆盖其他文件。用户需要拥有FILE权限来允许该语句。此外,MariaDB需要文件的写入权限。如果系统变量secure_file_priv设置为非空目录名,则只允许向该目录中写入文件。
CHARACTER SET
子句指定导出到文件时的字符集。如果不给定该子句,将不会转换字符集(按照binary character set的值)。这种情况下,如果使用了多种字符集(译注:例如不同字段使用不同字符集),则导出的文件也将使用多种字符集,则可能不利于以后的load操作。
SELECT ... INTO OUTFILE
导出的文件主要用于LOAD DATA INFILE语句来导入数据。
示例
下面的示例生成一个CSV格式的文件:
SELECT customer_id, firstname, surname INTO OUTFILE '/exportdata/customers.txt' FIELDS TERMINATED BY ',' OPTIONALLY ENCLOSED BY '"' LINES TERMINATED BY '\n' FROM customers;
See Also
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