在SQL Server数据库的安装目录下有一个可执行文件叫TEXTCOPY.EXE，使用它可以对SQL Server数据库中的文本或图像数据进行输入输出。假如你对它不熟悉,可以在MS-DOS方式下执行textcopy /? 来得到它的描述。
以下是这个工具的描述:
Copies a single text or image value into or out of SQL Server. The value is a specified text or image 'column' of a single row (specified by the "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 not
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 text or image data. If 'database' is not specified, the default 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 keyword) that specifies a single row of 'table'.
/F file The file name.
/I Copy text or image value into SQL Server from 'file'.
/O Copy text or image value out of SQL Server into ' file'.
/K chunksize Size of the data transfer buffer in bytes. Minimum 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.
我们可以写一个存储过程来调用这个命令
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..xp_cmdshell @exec_str
以下是一个拷贝图像到SQL Server的add数据库的例子, 表名add_info, 字段名
picture，图像文件名shuijing.bmp，保存到pub_id='0611'记录 。
sp_textcopy @srvname = 'ServerName',
@login = 'Login',
@password = 'Password',
@dbname = 'add',
@tbname = 'add_info',
@colname = 'picture',
@filename = 'c:shuijing.bmp',
@whereclause = " WHERE pub_id='0611' ",
@direction = 'I'
