我必须将输入文本文件(text_file.txt)复制到表(table_a)。我还需要将输入文件的名称包含在表中。
我的代码是:
\set t_pwd `pwd`
\set input_file '\'':t_pwd'/text_file.txt\''
copy table_a
( column1
,column2
,column3
,FileName :input_file
)
from :input_file
最后一行不会复制表格中的输入文本文件名。 如何将输入文本文件的名称复制到表中? (无需手动输入文件名)
答案 0 :(得分:2)
解决方案1
这可能不是您工作的完美解决方案,但我认为可以胜任:
您可以获取表名并将其存储在TBL变量中,然后在CSV文件中每行末尾添加此变量,您将要加载到Vertica中。
现在,根据您的CSV文件大小,这可能会耗费大量时间和CPU消耗。
export TBL=`ls -1 | grep *.txt` | sed -e 's/$/,'$TBL'/' -i $TBL
示例:
[dbadmin@bih001 ~]$ cat load_data1
1|2|3|4|5|6|7|8|9|10
[dbadmin@bih001 ~]$ export TBL=`ls -1 | grep load*` | sed -e 's/$/|'$TBL'/' -i $TBL
[dbadmin@bih001 ~]$ cat load_data1
1|2|3|4|5|6|7|8|9|10||load_data1
解决方案2
您可以使用DEFAULT CONSTRAINT
,请参阅示例:
的 1。使用 DEFAULT CONSTRAINT
[dbadmin@bih001 ~]$ vsql
Password:
Welcome to vsql, the Vertica Analytic Database interactive terminal.
Type: \h or \? for help with vsql commands
\g or terminate with semicolon to execute query
\q to quit
dbadmin=> create table TBL (id int ,CSV_FILE_NAME varchar(200) default 'TBL');
CREATE TABLE
dbadmin=> \dt
List of tables
Schema | Name | Kind | Owner | Comment
--------+------+-------+---------+---------
public | TBL | table | dbadmin |
(1 row)
查看 DEFAULT CONSTRAINT ,它有' TBL'默认值
dbadmin=> \d TBL
List of Fields by Tables
Schema | Table | Column | Type | Size | Default | Not Null | Primary Key | Foreign Key
--------+-------+---------------+--------------+------+---------+----------+-------------+-------------
public | TBL | id | int | 8 | | f | f |
public | TBL | CSV_FILE_NAME | varchar(200) | 200 | 'TBL' | f | f |
(2 rows)
<强> 2。现在设置您的COPY
变量
- 插入一些数据并将 DEFAULT CONSTRAINT 值更改为当前的:input_file
值。
dbadmin=> \set t_pwd `pwd`
dbadmin=> \set CSV_FILE `ls -1 | grep load*`
dbadmin=> \set input_file '\'':t_pwd'/':CSV_FILE'\''
dbadmin=>
dbadmin=>
dbadmin=> insert into TBL values(1);
OUTPUT
--------
1
(1 row)
dbadmin=> select * from TBL;
id | CSV_FILE_NAME
----+---------------
1 | TBL
(1 row)
dbadmin=> ALTER TABLE TBL ALTER COLUMN CSV_FILE_NAME SET DEFAULT :input_file;
ALTER TABLE
dbadmin=> \dt TBL;
List of tables
Schema | Name | Kind | Owner | Comment
--------+------+-------+---------+---------
public | TBL | table | dbadmin |
(1 row)
dbadmin=> \d TBL;
List of Fields by Tables
Schema | Table | Column | Type | Size | Default | Not Null | Primary Key | Foreign Key
--------+-------+---------------+--------------+------+----------------------------+----------+-------------+-------------
public | TBL | id | int | 8 | | f | f |
public | TBL | CSV_FILE_NAME | varchar(200) | 200 | '/home/dbadmin/load_data1' | f | f |
(2 rows)
dbadmin=> insert into TBL values(2);
OUTPUT
--------
1
(1 row)
dbadmin=> select * from TBL;
id | CSV_FILE_NAME
----+--------------------------
1 | TBL
2 | /home/dbadmin/load_data1
(2 rows)
现在,您可以在copy
脚本中实现此功能
示例:强>
\set t_pwd `pwd`
\set CSV_FILE `ls -1 | grep load*`
\set input_file '\'':t_pwd'/':CSV_FILE'\''
ALTER TABLE TBL ALTER COLUMN CSV_FILE_NAME SET DEFAULT :input_file;
copy TBL from :input_file DELIMITER '|' DIRECT;
解决方案3
使用LOAD_STREAMS
表
例如:
加载表格时会给它stream name
- 这样就可以识别文件名/流名称:
COPY mytable FROM myfile DELIMITER '|' DIRECT STREAM NAME 'My stream name';
*以下是查询load_streams表的方法:*
=> SELECT stream_name, table_name, load_start, accepted_row_count,
rejected_row_count, read_bytes, unsorted_row_count, sorted_row_count,
sort_complete_percent FROM load_streams;
-[ RECORD 1 ]----------+---------------------------
stream_name | fact-13
table_name | fact
load_start | 2010-12-28 15:07:41.132053
accepted_row_count | 900
rejected_row_count | 100
read_bytes | 11975
input_file_size_bytes | 0
parse_complete_percent | 0
unsorted_row_count | 3600
sorted_row_count | 3600
sort_complete_percent | 100
有道理吗?希望这有帮助!
答案 1 :(得分:1)
如果您不需要纯粹从vsql
内部进行操作,可能会有点作弊,并在bash之外导出逻辑,例如:
FILE=text_file.txt
(
while read LINE; do
echo "$LINE|$FILE"
done < "$FILE"
) | vsql -c 'copy table_a (...) FROM STDIN'
这样你就基本上COPY FROM STDIN
,在它到达Vertica之前为每一行添加文件名。