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》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.

2.2 导出全表数据

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。

2.3 导出符合指定条件的表数据

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。

三、验证

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