mysql查询结果导出到文件另一方法

2009年05月09日　作者： 大头刚　

一般大家都会用 “SELECT INTO OUTFIL”将查询结果导出到文件，但是这种方法不能覆盖或者添加到已经创建的文件。例如：

mysql> select 1 into outfile '/tmp/t1.txt';
Query OK, 1 row affected (0.00 sec)
mysql> select 1 into outfile '/tmp/t1.txt';
ERROR 1086 (HY000): File '/tmp/t1.txt' already exists
 
还可以使用另外一种方法：
mysql> pager cat > /tmp/t1.txt
PAGER set to 'cat > /tmp/t1.txt'
mysql> select 1;\! cat /tmp/t1.txt
1 row in set (0.00 sec)
+---+
| 1 |
+---+
| 1 | 
+---+

这样你能很方便的查询到2条sql的差异：

mysql> pager cat > /tmp/t01.txt
PAGER set to 'cat > /tmp/t01.txt'
mysql> select 12345 union select 67890;
2 rows in set (0.02 sec)
mysql> pager cat > /tmp/t02.txt
PAGER set to 'cat > /tmp/t02.txt'
mysql> select 12345 union select 67891;
2 rows in set (0.00 sec)
mysql> \! vimdiff -o  /tmp/t0[12].txt
2 files to edit
  +-------+
  | 12345 |
  +-------+
  | 12345 |
  | 67890 |                                                                                                                 
  +-------+                                                                                                              
/tmp/t01.txt 
  +-------+
  | 12345 |
  +-------+
  | 12345 |
  | 67891 |                                                                                                                 
  +------+                                                                                                         
/tmp/t02.txt
标签: | 分类 : Mysql










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