server

在MS SQL SERVER 安装目录下有个可执行文件叫 TEXTCOPY.EXE
可对 MS SQL SERVER 中的文本或图像数据进行输入输出.
不过你可以在MS-DOS方式下执行textcopy /? 得到它的描述。
下面是这个工具的描述:
Copies a single text or image value into or out of SQL Server. The val
ue
is a specified text or image 'column' of a single row (specified by th
e
"where clause") of the specified 'table'.

If the direction is IN (/I) then the data from the specified 'file' is

copied into SQL Server, replacing the existing text or image value. If
the
direction is OUT (/O) then the text or image value is copied from
SQL Server into the specified 'file', replacing any existing file.

TEXTCOPY [/S ][sqlserver]] [/U [login]] [/P ][password]]
[/D ][database]] [/T table] [/C column] [/W"where clause"]
[/F file] [{/I | /O}] [/K chunksize] [/Z] [/?]

/S sqlserver The SQL Server to connect to. If 'sqlserver' is n
ot
specified, the local SQL Server is used.
/U login The login to connect with. If 'login' is not spec
ified,
a trusted connection will be used.
/P password The password for 'login'. If 'password' is not
specified, a NULL password will be used.
/D database The database that contains the table with the tex
t or
image data. If 'database' is not specified, the d
efault
database of 'login' is used.
/T table The table that contains the text or image value.

/C column The text or image column of 'table'.
/W "where clause" A complete where clause (including the WHERE keyw
ord)
that specifies a single row of 'table'.
/F file The file name.
/I Copy text or image value into SQL Server from 'fi
le'.
/O Copy text or image value out of SQL Server into '
file'.
/K chunksize Size of the data transfer buffer in bytes. Minimu
m
value is 1024 bytes, default value is 4096 bytes.

/Z Display debug information while running.
/? Display this usage information and exit.

You will be prompted for any required options you did not specify.

为此, 可写一个存储过程,调用这个命令
CREATE PROCEDURE sp_textcopy (
srvname varchar (30),
login varchar (30),
password varchar (30),
dbname varchar (30),
tbname varchar (30),
colname varchar (30),
filename varchar (30),
whereclause varchar (40),
direction char(1))
AS
DECLARE exec_str varchar (255)
SELECT exec_str =
'textcopy /S ' + srvname +
' /U ' + login +
' /P ' + password +
' /D ' + dbname +
' /T ' + tbname +
' /C ' + colname +
' /W "' + whereclause +
'" /F ' + filename +
' /' + direction
EXEC master.. exec_str

下面是一个拷贝图像到SQL Server的pubs数据库的例子, 表名pub_info, 字段名
logo，图像文件名picture.bmp，保存到pub_id='0736'记录 sp_textcopy srvn
ame = 'ServerName',
login = 'Login',
password = 'Password',
dbname = 'pubs',
tbname = 'pub_info',
colname = 'logo',
filename = 'c:\picture.bmp',
whereclause = " WHERE pub_id='0736' ",
direction = 'I'