一个改进的ASP生成SQL 命令字符串的类

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〈%
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","" & sValue & ",{&*#}2")
case 1
sSQL=replace(sSQL,"{&*#}1",sFieldName)
sSQL=replace(sSQL,"{&*#}2","" & sValue & ",{&*#}1={&*#}2")
case 3
sSQL=replace(sSQL,"{&*#}1",sFieldName & ",{&*#}1")
End Select
End Sub

'修改的返回字符串值的函数
'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<>"" and iSQLType<>0 then
sSQL=sSQL & " where " & sWhere
end if
if sOrder<>"" and iSQLType<>0 then
sSQL=sSQL & " order by " & sOrder
end if
ReturnSQL=sSQL
End Function


'返回SQL语句
Public Function ReturnSQL1()
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<>"" and iSQLType<>0 then
sSQL=sSQL & " where " & sWhere
end if
if sOrder<>"" and iSQLType<>0 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
%〉

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