AntDB用户手册——登录数据库之adb登录

在集群主机上，默认安装了adb客户端，可以直接使用。如果需要在集群之外的主机上通过adb登录，则需要安装对应的antdb客户端。

通过adb --help命令可以得到adb的帮助信息：

adb is the PostgreSQL interactive terminal.

Usage:
  adb [OPTION]... [DBNAME [USERNAME]]

General options:
  -c, --command=COMMAND    run only single command (SQL or internal) and exit
  -d, --dbname=DBNAME      database name to connect to (default: "danghb")
  -f, --file=FILENAME      execute commands from file, then exit
  -l, --list               list available databases, then exit
  -v, --set=, --variable=NAME=VALUE
                           set adb variable NAME to VALUE
                           (e.g., -v ON_ERROR_STOP=1)
  -V, --version            output version information, then exit
  -X, --no-adbrc          do not read startup file (~/.adbrc)
  -1 ("one"), --single-transaction
                           execute as a single transaction (if non-interactive)
  -?, --help[=options]     show this help, then exit
      --help=commands      list backslash commands, then exit
      --help=variables     list special variables, then exit

Input and output options:
  -a, --echo-all           echo all input from script
  -b, --echo-errors        echo failed commands
  -e, --echo-queries       echo commands sent to server
  -E, --echo-hidden        display queries that internal commands generate
  -L, --log-file=FILENAME  send session log to file
  -n, --no-readline        disable enhanced command line editing (readline)
  -o, --output=FILENAME    send query results to file (or |pipe)
  -q, --quiet              run quietly (no messages, only query output)
  -s, --single-step        single-step mode (confirm each query)
  -S, --single-line        single-line mode (end of line terminates SQL command)

Output format options:
  -A, --no-align           unaligned table output mode
  -F, --field-separator=STRING
                           field separator for unaligned output (default: "|")
  -H, --html               HTML table output mode
  -P, --pset=VAR[=ARG]     set printing option VAR to ARG (see \pset command)
  -R, --record-separator=STRING
                           record separator for unaligned output (default: newline)
  -t, --tuples-only        print rows only
  -T, --table-attr=TEXT    set HTML table tag attributes (e.g., width, border)
  -x, --expanded           turn on expanded table output
  -z, --field-separator-zero
                           set field separator for unaligned output to zero byte
  -0, --record-separator-zero
                           set record separator for unaligned output to zero byte

Connection options:
  -h, --host=HOSTNAME      database server host or socket directory (default: "local socket")
  -p, --port=PORT          database server port (default: "5432")
  -U, --username=USERNAME  database user name (default: "danghb")
  -w, --no-password        never prompt for password
  -W, --password           force password prompt (should happen automatically)

For more information, type "\?" (for internal commands) or "\help" (for SQL
commands) from within adb, or consult the adb section in the PostgreSQL
documentation.

Report bugs to <pgsql-bugs@antdbql.org>.

其中我们需要我们重点关注的是：

• -h 指定数据库服务器的主机名称或者IP
• -p 指定数据库服务的端口
• -d 指定需要连接的数据库名称
• -U 指定需要连接的数据库用户名

一个完整的示例如下：

adb -h 192.168.1.1 -p 5432  -d antdb -U antdb

如果服务端对连接客户端设置了trust认证，则可以直接登录，如果设置了md5认证，则会提示输入密码：

Password for user antdb:

按照提示输入密码即可。

登录成功提示符：

adb (4.0.0 cbabf9feaf based on PG 10.7)
Type "help" for help.

antdb=#

可以通过更换-h和-p的参数值来连接集群中不同的coord节点。
集群中各个coord节点提供的功能都是一样的，后续操作登录任意coord节点均可。