Linux命令：MySQL系列之十三--MySQL备份与还原(针对单张表SELECT备份重要章节)

对于只备份单张表的备份与还原，通过SELECT命令，可以更快速的达到备份和恢复的目的；
以及通过此方法把一个数据库中表的数据，导入至另一数据库的表中去。

备份格式：SELECT * INTO OUTFILE '/PATH/TO/somefile.txt'
FROM table_name [WHERE CLAUSE];
#备份table_name表中的[或者备份满足WHERE语句的数据]数据至服务器上保存。
注释：table_name：需要备份的表 WHERE：满足的条件，可选项。
/PATH/TO：服务器上的路径目录，且此目录必须是执行SELECT语句的用户有写的权限，
否则无法备份。
还原格式：LOAD DATA INFILE '/PATH/TO/somefile.txt' INTO TABLE table_name;
注释：table_name：需要还原的表的名称，此表必须先在数据库中存在。 /PATH/TO：备份所存放的路径
mysql> CREATE TABLE tutor LIKE tutors; #仿照tutors表的框架创建一个空表tutor

实例：备份一个数据库表的数据，导入至另一个数据库表的数据；
mysql> USE jiaowu;
Database changed
mysql> SELECT * FROM tutors; #查询表tutors的信息
+-----+------------------+--------+-----+| TID | Tname | Gender | Age |+-----+------------------+--------+-----+| 1 | HongQigong | M | 93 || 2 | HuangYaoshi | M | 63 || 3 | HuangRong | F | 46 || 4 | HuYidao | M | 65 || 5 | XiaoLongnv | F | 28 || 6 | HuFei | M | 45 || 7 | GuoXiang | F | 32 |+-----+------------------+--------+-----+ 7 rows in set (0.00 sec) mysql> SELECT * INTO OUTFILE '/tmp/tutor.txt' FROM tutors; Query OK, 7 rows affected (0.01 sec) mysql> CREATE TABLE tutor LIKE tutors; Query OK, 0 rows affected (0.03 sec) mysql> DESC tutor;+---------+---------------------------+------+-----+---------+------------------+
| Field | Type | Null | Key | Default | Extra |+---------+---------------------------+------+-----+---------+------------------+| TID | smallint(5) unsigned | NO | PRI | NULL | auto_increment || Tname | varchar(50) | NO | | NULL | || Gender | enum('F','M') | YES | | M | || Age | tinyint(3) unsigned | YES | | NULL | | +---------+---------------------------+------+-----+---------+------------------+ 4 rows in set (0.01 sec) mysql> DESC tutors ;
+---------+---------------------------+------+-----+---------+------------------+
| Field | Type | Null | Key | Default | Extra |+---------+---------------------------+------+-----+---------+------------------+| TID | smallint(5) unsigned | NO | PRI | NULL | auto_increment || Tname | varchar(50) | NO | | NULL | || Gender | enum('F','M') | YES | | M | || Age | tinyint(3) unsigned | YES | | NULL | | +---------+---------------------------+------+-----+---------+------------------+ 4 rows in set (0.01 sec) mysql> DROP TABLE tuors;

Query OK, 0 rows affected (0.03 sec)
mysql> SELECT * FROM tutor; #查询表tutor的信息
Empty set (0.04 sec) (暂时无数据)
mysql> LOAD DATA INFILE '/tmp/tutor.txt' INTO TABLE tutor;
Query OK, 7 rows affected (0.04 sec)
Records: 7 Deleted: 0 Skipped: 0 Warnings: 0
mysql> SELECT * FROM tutor; #查询表tutor的信息
+-----+------------------+--------+-----+| TID | Tname | Gender | Age |+-----+------------------+--------+-----+| 1 | HongQigong | M | 93 || 2 | HuangYaoshi | M | 63 || 3 | HuangRong | F | 46 || 4 | HuYidao | M | 65 || 5 | XiaoLongnv | F | 28 || 6 | HuFei | M | 45 || 7 | GuoXiang | F | 32 |+-----+------------------+--------+-----+至此通过SELECT备份还原操作完成。