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我們在寫ASP資料庫程式的時候，通常都會用到SQL語句，而在增加資料和更新資料的時候，通常會使用一下方式：insert into message (incept,sender,title,content,sendtime,flag,issend) values ('"&incept(i)&"','"&membername&"','"&title&"','"&message&"',Now(),0,1) 當欄位比較多的時候，而且更新的表比較多的時候，修改起來會比較麻煩，而且尋找錯誤也比較困難。使用這個SQL類後可以簡化修改，而且查錯也比較容易。通過類的AddField函數增加欄位名和欄位值，可輕鬆的將欄位名和欄位值插入SQL語句，然後返回該SQL語句。 下面讓我們看看這個類的代碼： ＜%
class SQLString
'************************************
'變數定義
'************************************
'sTableName ---- 表名
'iSQLType ----SQL語句類型：0-增加，1-更新，2-刪除,3-查詢
'sWhere ---- 條件
'sOrder ---- 排序方式
'sSQL ----值 Private sTableName,iSQLType,sWhere,sOrder,sSQL '************************************
'類初始化/結束
'************************************ Private Sub Class_Initialize()
sTableName=""
iSQLType=0
sWhere=""
sOrder=""
sSQL=""
End Sub Private Sub Class_Terminate() End Sub '************************************
'屬性
'************************************
‘設定表名的屬性 Public Property Let TableName(value) sTableName=value End Property ‘設定條件 Public Property Let Where(value) sWhere=value End Property ‘設定排序方式 Public Property Let Order(value) sOrder=value End Property ‘設定查詢語句的類型 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 '************************************
'函數
'************************************
'增加欄位（欄位名稱，欄位值） 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語句
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 '清空語句 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 ‘建立類對象
a.TableName=" message " ‘設定表名為message
a.SQLType=0 ‘設定查詢類型為增加記錄
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 |
