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ADO Value 属性


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The Value property sets or returns the value of a Parameter, Field, or Property object.
Value属性的作用是:设置或返回一个参数、字段或属性对象的值。

Object
对象
Description of the Value Property
Value属性描述
Parameter The Value property sets or returns a variant that indicates the value of the Parameter object
Value属性设置或返回了一个用来指示Parameter[参数]对象的值

Note: The Recordset should be closed before you try to read the Value property. ADO can only read the Value property once from the provider
注意:记录集必须在你尝试读取Value属性之前关闭。ADO仅可以从技术提供对象[provider]处读取Value值一次

Field

The Value property sets or returns a variant that indicates the current value of the Field object
Value属性设置或返回了一个用来指示当前Field[字段]对象的值

Note: For a new Field object that are added to the Fields collection of a Record, you must first set the Value property and perform an update before you can set any other property
注意:对于一个新添加到一个记录中字段集内的字段对象而言,你必须首先对Value属性进行设置,并在你设置其它属性之前对Value属性进行更新

Property The Value property sets or returns a variant that indicates the current value of the Property object
Value属性设置或返回了一个用来指示当前Property[属性]对象的值

Note: You cannot set the Value for properties that are read-only
注意:你不能对一个只读属性设置一个值

Syntax
语法

objectname.Value

Example
案例

For a Field object:

<%
set conn=Server.CreateObject("ADODB.Connection")
conn.Provider="Microsoft.Jet.OLEDB.4.0"
conn.Open "c:/webdata/northwind.mdb"
set rs = Server.CreateObject("ADODB.Recordset")
rs.open "Select * from orders", conn
response.write(rs.Fields(0).Value)
rs.Close
conn.close
%>

For a Parameter object:

<%
set comm=Server.CreateObject("ADODB.Command")
set para=Server.CreateObject("ADODB.Parameter")
para.Type=adVarChar
para.Size=25
para.Direction=adParamInput
para.Value=varfname
comm.Parameters.Append para
%>

For a Property object:

<%
set conn=Server.CreateObject("ADODB.Connection")
conn.Provider="Microsoft.Jet.OLEDB.4.0"
conn.Open "c:/webdata/northwind.mdb"
set rs = Server.CreateObject("ADODB.Recordset")
rs.open "Select * from orders", conn
set prop=Server.CreateObject("ADODB.Property")
'Display the property attributes of the Orders Table
for each prop in rs.Properties response.write("Attr:" & prop.Attributes & "<br />") response.write("Name:" & prop.Name & "<br />") response.write("Value:" & prop.Value & "<br />")
next
rs.close
conn.close
set rs=nothing
set conn=nothing
%>

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