知识大全 MS SQL SERVER 图像或大文本的输入输出

Posted 2022-07-14 知

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　　在MS SQL SERVER 安装目录下有个可执行文件叫 TEXTCOPY EXE 利用它可对 MS SQL SERVER 中的文本或图像数据进行输入输出如果你对它不熟悉可以在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 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 plete 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 bytes default value is 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 ( )

　　@login varchar ( )

　　@password varchar ( )

　　@dbname varchar ( )

　　@tbname varchar ( )

　　@colname varchar ( )

　　@filename varchar ( )

　　@whereclause varchar ( )

　　@direction char( ))

　　DECLARE @exec_str varchar ( )

　　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

　　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= 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=

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