' clsSQLBuilder

‘ By YuHonglai

‘ www.hahaIT.com

‘ hahasoft@msn.com



' Note:提供重载方法以指明表名称，默认情况下，是传入参数 o 的类型＋"tbl_",此时类名称必须是 clsXXX 的形式.

' 如：

' dim Rooms as new clsRooms

' SQLBuilder.Add(Rooms)

' 此时程序将把 clsRooms 转换成 tbl_Rooms,以操作数据库表 tbl_Rooms

' 如果类名称和数据库表名称不具有上述对应关系，请使用 Add(o,"TableName")形式的方法，以显示指定要操作的数据库表的名称



Public Class SQLBuilder



' 当要生成的SQL语句的 where 条件语句很复杂时，用该常量作为 Select 方法中 FindCondition(HashTable)

' Key,例如：要生成 where Birth<'2000-4-4' and Birth>'1980-1-1' 的复杂条件时，用以下方法:

' Dim h as new HashTable

' h.Add(ComplexSQL,"_Birth<'2000-4-4' and _Birth>'1980-1-1'")

' 注意，Birth是实体类的属性名称，前面必须有一个下划线 "_"

' 处理时，程序将用实际数据库字段名称代替相应的 _Birth



Public Const ComplexSQL As String = "@ComplexSQL"



' 根具实体类生成相应的 Insert ...SQL 语句

' 如果与数据库表名称对应的属性时 关键字段而且是自动增加值时(在DB.XML文件中seed的值为 1 )

' 那么该属相将忽略,不会出现在返回的 Insert... SQL语句中

Public Overloads Shared Function Add(ByVal o As Object) As String

Dim typeString As String = o.GetType.ToString

Dim i As Int16

i = typeString.IndexOf("cls") + 3

typeString = "tbl_" & typeString.Substring(i, typeString.Length - i)

Return Add(o, typeString)

End Function



Public Overloads Shared Function Add(ByVal o As Object, ByVal TableName As String) As String

Try

Dim outSQL As String

Dim tmpString As String



outSQL = "insert into [" & TableName & "]("

tmpString = ""



Dim dsDB As New DataSet

dsDB.ReadXml(clsPersistant.DBConfigPath)



Dim row As Data.DataRow



For Each row In dsDB.Tables(TableName).Rows

If row.Item("seed") & "" = "0" Then

outSQL = outSQL & row.Item("dbname") & ","

tmpString = tmpString & getS(row.Item("type")) & "@" & row.Item("dbname") & getS(row.Item("type")) & ","

End If

Next

outSQL = outSQL.Substring(0, outSQL.Length - 1)

tmpString = tmpString.Substring(0, tmpString.Length - 1)

outSQL = outSQL & ") values (" & tmpString & ")"



For Each row In dsDB.Tables(TableName).Rows

If row.Item("seed") & "" <> "1" Then

' tmpString = o.GetType.InvokeMember(row.Item("name"), Reflection.BindingFlags.GetField Or Reflection.BindingFlags.GetProperty, Nothing, o, New Object() {}) & ""

tmpString = CallByName(o, CType(row.Item("name"), String).Trim, CallType.Get) & ""

If tmpString = "True" Then

tmpString = "1"

ElseIf tmpString = "False" Then

tmpString = "0"

End If

outSQL = outSQL.Replace("@" & row.Item("dbname"), tmpString)

End If

Next



Return outSQL.Trim

Catch ex As Exception

Throw ex

End Try

End Function