GBase 8a数据库加载时，可以指定多个字符作为字段分隔符和行分隔符，可以指定最多1个字符作为包围符。这些字符可以通过\xXX的方式指定不可见字符。
目录导航
不可见字符格式
支持2种方式，比如对应16进制的FF ,可以用 ’\xFF‘ 或者 x'FF'， 如果有多个，连续单独写在一起即可，比如 ’\xff\xfe\xfd' 或者 x'fffefd'，第二种写法更简单些，但第一种看上去更容易理解。
其中\在数据库属于转义字符，如果你需要把\存入数据库的某个字段内，需要用\\
gbase> desc t3;
+-------+--------------+------+-----+---------+-------+
| Field | Type | Null | Key | Default | Extra |
+-------+--------------+------+-----+---------+-------+
| value | varchar(100) | YES | | NULL | |
+-------+--------------+------+-----+---------+-------+
1 row in set (Elapsed: 00:00:00.00)
gbase> insert into t3 values ('\\xff');
Query OK, 1 row affected (Elapsed: 00:00:00.14)
gbase> select * from t3;
+-------+
| value |
+-------+
| \xff |
+-------+
1 row in set (Elapsed: 00:00:00.00)
导出数据
如下是导出1个3列表里的2列，用\xff作为字段分隔符。通过xxd命令，可以看到该文件确实是16进制的FF作为了分隔符。
后面是多个分隔符的例子。
gbase> desc t1;
+-------+----------+------+-----+---------+-------+
| Field | Type | Null | Key | Default | Extra |
+-------+----------+------+-----+---------+-------+
| id | int(11) | YES | MUL | NULL | |
| value | int(11) | YES | | NULL | |
| birth | datetime | YES | | NULL | |
+-------+----------+------+-----+---------+-------+
3 rows in set (Elapsed: 00:00:00.00)
gbase> select * from t1;
+------+--------+---------------------+
| id | value | birth |
+------+--------+---------------------+
| 1 | 234 | NULL |
| 2 | 567 | NULL |
| 3 | 888 | NULL |
| 4 | 999 | NULL |
| 5 | 555555 | 2020-01-03 00:00:00 |
+------+--------+---------------------+
5 rows in set (Elapsed: 00:00:00.05)
gbase> select id,value from t1 into outfile '/home/gbase/t1.txt' fields terminated by '\xff' ESCAPED BY '';
Query OK, 5 rows affected, 1 warning (Elapsed: 00:00:00.03)
gbase> system xxd /home/gbase/t1.txt/t1.txt
0000000: 31ff 3233 340a 32ff 3536 370a 33ff 3838 1.234.2.567.3.88
0000010: 380a 34ff 3939 390a 35ff 3535 3535 3535 8.4.999.5.555555
0000020: 0a
gbase> select id,value from t1 into outfile '/home/gbase/t1.txt' fields terminated by '\xff\xfe\xfd' ESCAPED BY '' writemode by overwrites;
Query OK, 5 rows affected, 1 warning (Elapsed: 00:00:00.02)
gbase>
gbase> system xxd /home/gbase/t1.txt/t1.txt
0000000: 31ff fefd 3233 340a 32ff fefd 3536 370a 1...234.2...567.
0000010: 33ff fefd 3838 380a 34ff fefd 3939 390a 3...888.4...999.
0000020: 35ff fefd 3535 3535 3535 0a 5...555555.
gbase>
gbase>
gbase> select id,value from t1 into outfile '/home/gbase/t1.txt' fields terminated by x'fffefd' ESCAPED BY '' writemode by overwrites;
Query OK, 5 rows affected, 1 warning (Elapsed: 00:00:00.04)
gbase> system xxd /home/gbase/t1.txt/t1.txt
0000000: 31ff fefd 3233 340a 32ff fefd 3536 370a 1...234.2...567.
0000010: 33ff fefd 3838 380a 34ff fefd 3939 390a 3...888.4...999.
0000020: 35ff fefd 3535 3535 3535 0a 5...555555.
gbase>
导入数据
同样格式，加载到一个其它表里面。我们分别用2种格式，都正确加载了。
gbase> desc t2;
+-------+---------+------+-----+---------+-------+
| Field | Type | Null | Key | Default | Extra |
+-------+---------+------+-----+---------+-------+
| id | int(11) | YES | | NULL | |
| value | int(11) | YES | | NULL | |
+-------+---------+------+-----+---------+-------+
2 rows in set (Elapsed: 00:00:00.00)
gbase> truncate table t2;
Query OK, 2 rows affected (Elapsed: 00:00:00.26)
gbase> load data infile 'sftp://gbase:gbase1234@10.0.2.106/home/gbase/t1.txt/t1.txt' into table t2 fields terminated by '\xff';
Query OK, 5 rows affected (Elapsed: 00:00:11.96)
Task 1835193 finished, Loaded 5 records, Skipped 0 records
gbase> select * from t2;
+------+--------+
| id | value |
+------+--------+
| 2 | 567 |
| 4 | 999 |
| 1 | 234 |
| 3 | 888 |
| 5 | 555555 |
+------+--------+
5 rows in set (Elapsed: 00:00:00.00)
gbase> load data infile 'sftp://gbase:gbase1234@10.0.2.106/home/gbase/t1.txt/t1.txt' into table t2 fields terminated by x'ff';
Query OK, 5 rows affected (Elapsed: 00:00:06.35)
Task 1835196 finished, Loaded 5 records, Skipped 0 records
gbase> select * from t2;
+------+--------+
| id | value |
+------+--------+
| 2 | 567 |
| 4 | 999 |
| 2 | 567 |
| 4 | 999 |
| 1 | 234 |
| 3 | 888 |
| 5 | 555555 |
| 1 | 234 |
| 3 | 888 |
| 5 | 555555 |
+------+--------+
10 rows in set (Elapsed: 00:00:00.01)
gbase> load data infile 'sftp://gbase:gbase1234@10.0.2.106/home/gbase/t1.txt/t1.txt' into table t2 fields terminated by x'fffefd';
Query OK, 5 rows affected (Elapsed: 00:00:01.31)
Task 1835197 finished, Loaded 5 records, Skipped 0 records
gbase> select * from t2;
+------+--------+
| id | value |
+------+--------+
| 2 | 567 |
| 4 | 999 |
| 2 | 567 |
| 4 | 999 |
| 2 | 567 |
| 4 | 999 |
| 1 | 234 |
| 3 | 888 |
| 5 | 555555 |
| 1 | 234 |
| 3 | 888 |
| 5 | 555555 |
| 1 | 234 |
| 3 | 888 |
| 5 | 555555 |
+------+--------+
15 rows in set (Elapsed: 00:00:00.01)
gbase> load data infile 'sftp://gbase:gbase1234@10.0.2.106/home/gbase/t1.txt/t1.txt' into table t2 fields terminated by '\xff\xfe\xfd';
Query OK, 5 rows affected (Elapsed: 00:00:07.16)
Task 1835198 finished, Loaded 5 records, Skipped 0 records
gbase> select * from t2;
+------+--------+
| id | value |
+------+--------+
| 1 | 234 |
| 3 | 888 |
| 5 | 555555 |
| 1 | 234 |
| 3 | 888 |
| 5 | 555555 |
| 1 | 234 |
| 3 | 888 |
| 5 | 555555 |
| 1 | 234 |
| 3 | 888 |
| 5 | 555555 |
| 2 | 567 |
| 4 | 999 |
| 2 | 567 |
| 4 | 999 |
| 2 | 567 |
| 4 | 999 |
| 2 | 567 |
| 4 | 999 |
+------+--------+
20 rows in set (Elapsed: 00:00:00.02)