sqlplus -help

因为前面一个错误，觉得自己对于sqlplus这个命令了解的太少，特贴出sqlplus帮助，并加以简要的注释。

SQL*Plus: Release 11.2.0.4.0 Production  --版本

Copyright (c) 1982, 2013, Oracle.  All rights reserved.

Use SQL*Plus to execute SQL, PL/SQL and SQL*Plus statements.

Usage 1: sqlplus -H | -V

    -H             Displays the SQL*Plus version and the
                   usage help.     ---查看SQL*PLUS版本和帮助信息
    -V             Displays the SQL*Plus version. --查看SQL*PLUS版本

Usage 2: sqlplus [ [] [{logon | /nolog}] [] ]

   is: [-C ] [-L] [-M ""] [-R ] [-S]

    -C    Sets the compatibility of affected commands to the
                   version specified by .  The version has
                   the form "x.y[.z]".  For example, -C 10.2.0
    -L             Attempts to log on just once, instead of
                   reprompting on error.  --只登陆一次，失败不retry
    -M "" Sets automatic HTML markup of output.  The options
                   have the form:
                   HTML [ON|OFF] [HEAD text] [BODY text] [TABLE text]
                   [ENTMAP {ON|OFF}] [SPOOL {ON|OFF}] [PRE[FORMAT] {ON|OFF}]
    -R      Sets restricted mode to disable SQL*Plus commands
                   that interact with the file system.  The level can
                   be 1, 2 or 3.  The most restrictive is -R 3 which
                   disables all user commands interacting with the
                   file system.
    -S             Sets silent mode which suppresses the display of
                   the SQL*Plus banner, prompts, and echoing of
                   commands. --这个是设置静默模式，会屏蔽执行的命令。

   is: {[/][@] | / }
              [AS {SYSDBA | SYSOPER | SYSASM}] [EDITION=value]

    Specifies the database account username, password and connect
    identifier for the database connection.  Without a connect
    identifier, SQL*Plus connects to the default database.

    The AS SYSDBA, AS SYSOPER and AS SYSASM  options are database
    administration privileges.

     can be in the form of Net Service Name
    or Easy Connect.

      @[ | [//]Host[:Port]/]

         is a simple name for a service that resolves
        to a connect descriptor.--这个是tnsnames.ora里面的服务名

        Example: Connect to database using Net Service Name and the
                 database net service name is ORCL.

           sqlplus myusername/mypassword@ORCL

        Host specifies the host name or IP address of the database
        server computer.

        Port specifies the listening port on the database server.  --一般是1521

         specifies the service name of the database you
        want to access.

        Example: Connect to database using Easy Connect and the
                 Service name is ORCL.

           sqlplus myusername/mypassword@Host/ORCL

    The /NOLOG option starts SQL*Plus without connecting to a
    database.

    The EDITION specifies the value for Session Edition.


   is: @|[.] [ ...]

    Runs the specified SQL*Plus script from a web server (URL) or the
    local file system (filename.ext) with specified parameters that
    will be assigned to substitution variables in the script.

When SQL*Plus starts, and after CONNECT commands, the site profile
(e.g. $ORACLE_HOME/sqlplus/admin/glogin.sql) and the user profile
(e.g. login.sql in the working directory) are run.  The files may
contain SQL*Plus commands.

Refer to the SQL*Plus User's Guide and Reference for more information.