Vertica 导出数据测试用例

需求：构建简单的测试用例，完成演示Vertica导出数据的功能。

测试用例：导出test业务用户t_jingyu表中的数据。

一、初始化测试环境

二、导出数据

• 2.1 vsql命令说明帮助
• 2.2 导出全表数据
• 2.3 导出符合指定条件的表数据

三、验证

一、初始化测试环境

业务用户test下创建t_jingyu测试表，并初始化一些数据.
参考《[Vertica 业务用户指定资源池加载数据](http://www.cnblogs.com/jyzhao/p/4916932.html)》构建初始化测试环境。

二、导出数据

2.1 vsql命令说明帮助

```
[dbadmin@vertica1 ~]$ vsql --help
This is vsql, the Vertica Analytic Database interactive terminal.

Usage:

vsql [OPTIONS]... [DBNAME [USERNAME]]

General options:

-d DBNAME specify database name to connect to (default: "dbadmin")

-c COMMAND run only single command (SQL or internal) and exit

-f FILENAME execute commands from file, then exit

-l list available databases, then exit

-v NAME=VALUE set vsql variable NAME to VALUE

-X do not read startup file (~/.vsqlrc)

--help show this help, then exit

--version output version information, then exit

Input and output options:

-a echo all input from script

-e echo commands sent to server

-E display queries that internal commands generate

-q run quietly (no messages, only query output)

-o FILENAME send query results to file (or |pipe)

-n disable enhanced command line editing (readline)

-s single-step mode (confirm each query)

-S single-line mode (end of line terminates SQL command)

Output format options:

-A unaligned table output mode (-P format=unaligned)

-b beep on command completion

-H HTML table output mode (-P format=html)

-t print rows only (-P tuples_only)

-T TEXT set HTML table tag attributes (width, border) (-P tableattr=)

-x turn on expanded table output (-P expanded)

-P VAR[=ARG] set printing option VAR to ARG (see \pset command)

-F STRING set field separator for unaligned output (default: "|") (-P fieldsep=)

-R STRING set record separator (default: newline) (-P recordsep=)

Connection options:

-B SERVER:PORT set connection backup server/port (default: not set)

-C enable connection load balancing (default: not enabled)

-h HOSTNAME database server host or socket directory (default: "local socket")

-p PORT database server port (default: "5433")

-U NAME database user name (default: "dbadmin")

-W prompt for password (should happen automatically)

-w PASSWORD database user's password

-k KRB SERVICE Kerberos service name (default: "vertica")

-K KRB HOST Kerberos host name

For more information, type "?" (for vsql commands)

from within vsql, or consult the vsql section in

the Vertica Analytic Database documentation.

<h2 id="2.2"> 2.2 导出全表数据 </h2>
根据vsql参数说明，确定本次导出表数据的命令：

vsql -Utest -wtestpwd -At -F'|' -c "select * from t_jingyu" -o /tmp/t_jingyu_expdata.dat

最终实现将test用户下t_jingyu的数据导出到文件/tmp/t_jingyu_expdata.dat中。
<h2 id="2.3"> 2.3 导出符合指定条件的表数据 </h2>可以指定where条件，只导出符合条件的数据，例如：

vsql -Utest -wtestpwd -At -F'|' -c "select * from t_jingyu where col1=1" -o /tmp/t_jingyu_expdata_col1.dat

这样就只导出col1=1的t_jingyu表中数据到文件/tmp/t_jingyu_expdata_col1.dat中。

<h1 id="3">三、验证</h1>
查看表数据的导出文件/tmp/t_jingyu_expdata.dat内容：

[dbadmin@vertica1 tmp]$ more /tmp/t_jingyu_expdata.dat

4|martin|2014-06-20 00:00:00

1|jingyu|2014-06-19 00:00:00

5|靖宇|2014-06-19 00:00:00

3|alfred|2014-05-20 00:00:00

2|xiaobei|2014-06-20 00:00:00

查看表数据的导出文件/tmp/t_jingyu_expdata_col1.dat内容：

[dbadmin@vertica1 tmp]$ more /tmp/t_jingyu_expdata_col1.dat

1|jingyu|2014-06-19 00:00:00