freetds下详细配置内容

网址http://manpages.ubuntu.com/manpages/natty/man5/freetds.conf.5.html

</pre><a target=_blank href="http://manpages.ubuntu.com/manpages/natty/">natty</a> (<a target=_blank href="http://manpages.ubuntu.com/manpages/natty/man5">5</a>) <a target=_blank href="http://manpages.ubuntu.com/manpages.gz/natty/man5/freetds.conf.5.gz">freetds.conf.5.gz</a> Provided by: <a target=_blank href="https://launchpad.net/ubuntu/natty/+package/freetds-common">freetds-common_0.82-7_all</a> <a target=_blank title="Report a bug in the content of this documentation" href="https://bugs.launchpad.net/ubuntu/+source/freetds/+filebug-advanced"><img alt="bug" src="http://manpages.ubuntu.com/img/bug.png" border="0" /></a><h4 id="contenttoc0"><strong>NAME</strong></h4><pre>     <strong>freetds.conf</strong> — configuration file for FreeTDS

SYNOPSIS

The freetds.conf file describes Sybase and Microsoft dataservers to the
     FreeTDS library.  It comprises sections headed by a servername, followed
     by a list of connection properties denoted as name-value pairs.  Defaults
     are defined via a [global] section.  This file supersedes the interfaces
     file that Sybase defines for the same purpose, although the latter is
     still supported.

DESCRIPTION

A section begins with a servername — the name of the server — in square
     brackets. The servername is chosen at the client's descretion.  (One
     exception: with Sybase ASA the servername must match the database name to
     be used.)

     Sections contain properties, one per line, in the form

           name = value

     where name is the connection property to be described.  Servernames and
     properties are not case sensitive.  Values are case-preserving i.e.,
     copied literally.  Comments begin with either a semicolon (‘;’) or pound
     sign (‘#’) and continue to end of line.  Blank lines are ignored.
     Whitespace surrounding the ‘=’ is ignored.

PROPERTIES

client charset         encoding of client data; overrides locale(1)
                            settings
                            Domain:   iconv character set names
                            Default:  ISO-8859-1
     connect timeout        seconds to wait for response from connect request
                            Domain:   0 to MAX_INT
                            Default:  none
     debug flags            logging granularity
                            Domain:   32-bit integer
                            Default:  0x4fff
     dump file              specifies location of a logfile and turns on
                            logging
                            Domain:   valid file name
                            Default:  none
     dump file append       log data appended to file instead of re-writing
                            for each connection
                            Domain:   yes/no
                            Default:  no
     emulate little endian  forces big endian machines to act as little endian
                            to communicate with Microsoft Servers
                            Domain:   yes/no
                            Default:  no
     encryption
                            off         disables encryption (default)
                            request     use if available
                            required    allow encrypted connections only
     host                   Name of the host the dataserver is running on.
                            Domain:   host name or IP address
                            Default:  SYBASE
     initial block size     maximum size of a protocol block
                            Domain:   multiple of 512
                            Default:  512
     instance               name of Microsoft SQL Server instance to connect
                            to (supersedes port)
                            Domain:   instance name
                            Default:  none
     port                   port number that the dataserver is listening to
                            Domain:   any valid port
                            Default:  TDS 5.0, 5000; TDS 7.0 and up, 1433
     tds version            TDS protocol version to use
                            Domain:   4.2, 5.0, 7.0, 8.0
                            Default:  --with-tdsver value (5.0 if unspecified)
     text size              default value of TEXTSIZE, in bytes
                            Domain:   0 to 4,294,967,295
                            Default:  4,294,967,295
     timeout                seconds to wait for response to a query
                            Domain:   0 to MAX_INT
                            Default:  none (wait forever)

     Boolean property values may be denoted as on/off, true/false, or 1/0.

   DEBUG FLAGS
     The log's granularity can be controlled with the debug flags property.

           Value     Meaning
             0x02    severe error
             0x04    error
             0x08    warning
             0x10    network
             0x20    information level 1
             0x40    information level 2
             0x80    function trace and info
           0x1000    show pid
           0x2000    show time
           0x4000    show source level info (source file and line)
           0x8000    thread id (not implemented).

NAMES AND LOCATIONS

The file is normally named /etc/freetds.conf or ${HOME}/.freetds.conf.
     That name can be overridden with the FREETDSCONF environment variable.

     FreeTDS will search conf files for a servername in the following order:
           1.   a filename set programatically via dbsetifile() that is in
                .conf format
           2.   a filename in the environment variable FREETDSCONF that is in
                .conf format
           3.   ${HOME}/.freetds.conf if extant
           4.   @sysconfdir@/freetds.conf

     The search stops with the first file containing the servername.

     If no conf file is found, FreeTDS searches for an interfaces file in the
     following order:
           1.   a filename set programatically via dbsetifile() that is in
                interfaces format
           2.   ${HOME}/.interfaces
           3.   $SYBASE/interfaces (where $SYBASE is an environment variable)

     If the requested servername is not found in any configuration file, the
     fallback mechanism is:
           1.   attempt to convert the name to an IP address with
                inet_addr(3), else
           2.   attempt to convert the name to an IP address with
                gethostbyname(3), else
           3.   attempt to look up the literal name “SYBASE”

ENVIRONMENT

FREETDSCONF    overrides name and location of the system-wide conf file
     TDSDUMP        overrides the name and location of the FreeTDS log file
     TDSDUMPCONFIG  specifies a name and location of a file that logs the
                    search of configuration files
     TDSHOST        overrides the host property
     TDSPORT        overrides the port property
     TDSQUERY       synonym for DSQUERY, the default servername
     TDSVER         overrides the version specified in the freetds.conf

     The environment variables TDSVER, TDSDUMP, TDSPORT, TDSQUERY, and TDSHOST
     override values set by a .conf or interfaces file.

FILES

@sysconfdir@/freetds.conf, ${HOME}/.freetds.conf

SEE ALSO

FreeTDS User Guide.

HISTORY

[FreeTDS] [@version@]          December 23, 2007         [FreeTDS] [@version@]

自己探索许久的odbc数据库超时问题也采用以上方法得以解决。

登录超时 setConnectOption(SQL_ATTR_CONNECTION_TIMEOUT =1)

访问超时修改freetds下的timeout = 1 connect timout = 1