一个改进的ASP生成SQL 命令字符串的类

2018-09-06 11:26

阅读:480

  
作者:老杨

  〈%
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
%〉

  调用例子:

  <%
set a =new SQLString 创建类对象
a.TableName= message 设置表名为message
a.where= issend =9
a.order= issend desc
a.SQLType=0 设置查询类型为增加记录
a.AddField incept, 2
a.AddField sender , %3%
a.AddField title , #now#
a.AddField sender , 5
a.AddField content , 6
a.AddField sendtime , 7
a.AddField flag, 8
a.AddField issend , 9

  Response.Write a.ReturnSQl
set a=nothing
%>
<%
set a =new SQLString 创建类对象
a.TableName= message 设置表名为message
a.where= issend =9
a.order= issend desc
a.SQLType=0 设置查询类型为增加记录
a.AddField incept, 2
a.AddField sender , %3%
a.AddField title , #now#
a.AddField sender , 5
a.AddField content , 6
a.AddField sendtime , 7
a.AddField flag, 8
a.AddField issend , 9

  Response.Write a.ReturnSQl
set a=nothing
%>

  <%
set a =new SQLString 创建类对象
a.TableName= message 设置表名为message
a.where= issend =9
a.order= issend desc
a.SQLType=0 设置查询类型为增加记录
a.AddField incept, 2
a.AddField sender , %3%
a.AddField title , #now#
a.AddField sender , 5
a.AddField content , 6
a.AddField sendtime , 7
a.AddField flag, 8
a.AddField issend , 9

  Response.Write a.ReturnSQl
set a=nothing
%>


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