ASP整合一个SQL语句类

2015-08-12 16:02:04来源:作者:人点击

 我们在写asp数据库程序的时候,通常都会用到SQL语句,而在增加数据和更新数据的时候,通常会使用一下方式:insert into message (incept,sender,title,content,sendtime,flag,issend) values ('"&incept(i)&"','"&membername&"','"&title&"','"&message&"',Now(),0,1) 当字段比较多的时候,而且更新的表比较多的时候,修改起来会比较麻烦,而且查找错误也比较困难。使用这个SQL类后可以简化修改,而且查错也比较容易。通过类的AddField函数增加字段名和字段值,可轻松的将字段名和字段值插入SQL语句,然后返回该SQL语句。

下面让我们看看这个类的代码:

<%
class SQLString
'************************************
'变量定义
'************************************
'sTableName ---- 表名
'iSQLType ----SQL语句类型:0-增加,1-更新,2-删除,3-查询
'sWhere ---- 条件
'sOrder ---- 排序方式
'sSQL ----值

PRivate sTableName,iSQLType,sWhere,sOrder,sSQL

'************************************
'类初始化/结束
'************************************

Private Sub Class_Initialize()
sTableName=""
iSQLType=0
sWhere=""
sOrder=""
sSQL=""
End Sub

Private Sub Class_Terminate()

End Sub

'************************************
'属性
'************************************
‘设置表名的属性

Public Property Let TableName(value)

 sTableName=value

End Property

‘设置条件

Public Property Let Where(value)

 sWhere=value

End Property

‘设置排序方式

Public Property Let Order(value)

 sOrder=value

End Property

‘设置查询语句的类型

Public property Let SQLType(value)

 iSQLType=value
select case iSQLType
case 0
sSQL="insert into #0 (#1) values (#2)"
case 1
sSQL="update #0 set #1=#2"
case 2
sSQL="delete from #0 "
case 3
sSQL="select #1 from #0 " 
end select
End Property

'************************************
'函数
'************************************
'增加字段(字段名称,字段值)

Public Sub AddField(sFieldName,sValue)
select case iSQLType
case 0
sSQL=replace(sSQL,"#1",sFieldName & ",#1")
sSQL=replace(sSQL,"#2","'" & sFieldName & "',#2")
case 1
sSQL=replace(sSQL,"#1",sFieldName)
sSQL=replace(sSQL,"#2","'" & sFieldName & "',#1=#2")
case 3
sSQL=replace(sSQL,"#1",sFieldName & ",#1")
End Select
End Sub

 '返回SQL语句
Public Function ReturnSQL()
sSQL=replace(sSQL,"#0",sTableName)
select case iSQLType
case 0
sSQL=replace(sSQL,",#1","")
sSQL=replace(sSQL,",#2","")
case 1
sSQL=replace(sSQL,",#1=#2","")
case 3
sSQL=replace(sSQL,",#1","")
end Select
if sWhere<>"" then
sSQL=sSQL & " where " & sWhere
end if
if sOrder<>"" then
sSQL=sSQL & " order by " & sOrder
end if
ReturnSQL=sSQL
End Function

'清空语句

Public Sub Clear()
sTableName=""
iSQLType=0
sWhere=""
sOrder=""
sSQL=""

End Sub

end class

%>
 

使用方法:

例句:insert into message (incept,sender,title,content,sendtime,flag,issend) values ('"&incept(i)&"','"&membername&"','"&title&"','"&message&"',Now(),0,1)

set a =new SQLString ‘创建类对象
a.TableName=" message " ‘设置表名为message
a.SQLType=0 ‘设置查询类型为增加记录
a.AddField " incept", incept(i)
a.AddField " sender ", membername
a.AddField " title ", membername
a.AddField " sender ", title
a.AddField " content ", message 
a.AddField " sendtime ", sendtime()
a.AddField " flag", 0
a.AddField " issend ", 1
Response.Write a.ReturnSQl
set a=nothing 

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