一、建一個外部數據源的
dataobject對象，取名爲：d_tabular_query ，各列如下：| Name | Type | Lenth | Dec |
| column_name | string | 10 | |
| compare | string | 3 | |
| value | string | 255 | |
| and_or | string | 3 |
二、建一窗口w_condition_query_template，Title設置爲：“組合條件查詢窗口模板”，並加入控件：
| 控件名 | 類型 | 說明 |
| dw_query_condition | datawindow | 用以輸入查詢條件 Datawindow Object Name 爲前所建數據窗口對象 d_tabular_query |
| cb_add | command button | 增加一查詢條件 |
| cb_del | command button | 刪除一查詢條件 |
| cb_ins | command button | 插入一查詢條件 |
| cb_clear | command button | 清除所有詢條件 |
| cb_ok | command button | 由查詢條件得出結果 |
| dw_query | datawindow | 查詢結果 Datawindow Object Name 爲空，繼承後的子窗口再加入。 |
| cb_all | command button | 顯示所有記錄 |
| cb_print | command button | 打印查詢結果 |
| cb_exit | command button | 退出 |
三、編寫腳本
1、在dw_query_condition的Constractor事件中加入如下腳本：
//-------------------------------------------------------------//
// 功能說明：根據數據窗口dw_query設定可組合項，供組合查詢選擇
// 注意事項：數據窗口dw_query的對象中text命名須用默認值，
// 即：列名+ _t
// 柯建勳 於1999年4月27日
//-----------------------------------------------------------------------//
long ll_column_count
long ll_i
long ll_row
string ls_column
string ls_column_name
this.settransobject(sqlca)
ll_row = this.insertrow(0)
this.setitem(ll_row,'compare','=')
this.setitem(ll_row,'and_or','and')
ll_column_count = long(dw_query.Describe("DataWindow.Column.Count")) //總列數
this.ClearValues("column_name")
for ll_i = 1 to ll_column_count
if dw_query.Describe("#"+string(ll_i)+".Visible") = '1' then
ls_column = dw_query.Describe("#"+string(ll_i)+".Name") //列名
ls_column_name = dw_query.Describe(ls_column + "_t.text") //列名對應文本
this.SetValue("column_name", ll_i , ls_column_name + "~t" + ls_column)
end if
next
2
、定義dw_query_condition的用戶事件ue_Enterkeydown，Event ID選擇pbm_dwnProcessEnter。當我們按下Enter鍵時，將觸發此事件。在ue_Enterkeydown事件中加入如下腳本：
//回車鍵(Enter)切換列焦點
long ll_column_count
long ll_column
ll_column_count = long(this.Describe("DataWindow.Column.Count"))
ll_column = this.getcolumn()
if ll_column = ll_column_count then
cb_add.triggerevent(clicked!) //增加一行
else
this.setcolumn(ll_column + 1)
end if
3、在cb_add的Clicked事件加入：
long ll_row
ll_row = dw_query_condition.insertrow(0)
dw_query_condition.setitem(ll_row,'compare','=')
dw_query_condition.setitem(ll_row,'and_or','and')
dw_query_condition.SetColumn(1)
4、在cb_del的Clicked事件加入：
long ll_row
ll_row = dw_query_condition.getrow()
dw_query_condition.DeleteRow(ll_row)
long ll_new_row
ll_row = dw_query_condition.getrow()
ll_new_row = dw_query_condition.InsertRow(ll_row)
dw_query_condition.setitem(ll_new_row,'compare','=')
dw_query_condition.setitem(ll_new_row,'and_or','and')
dw_query_condition.SetColumn(1)
6、在cb_clear的Clicked事件加入：
long ll_row
dw_query_condition.reset()
ll_row = dw_query_condition.insertrow(0)
dw_query_condition.setitem(ll_row,'compare','=')
dw_query_condition.setitem(ll_row,'and_or','and')
//-----------------------------------------------------------------------//
// 條件組合查詢 柯建勳 1999.04.27
//-----------------------------------------------------------------------//
long ll_rowcount
long ll_row
long ll_j
string ls_filter_condition
string ls_column
string ls_compare
string ls_value
string ls_and_or
string ls_column_type
if dw_query_condition.AcceptText() = -1 then return
ll_rowcount = dw_query_condition.rowcount()
if ll_rowcount <=0 then return
ls_filter_condition = ''
for ll_row = 1 to ll_rowcount
ls_column = dw_query_condition.getitemstring(ll_row, 'column_name')
ls_compare = dw_query_condition.getitemstring(ll_row, 'compare')
ls_value = dw_query_condition.getitemstring(ll_row, 'value')
ls_and_or = dw_query_condition.getitemstring(ll_row, 'and_or')
ls_column_type = dw_query.Describe(ls_column + ".ColType") //
ls_column_type = left(ls_column_type, 3)
if ll_row = ll_rowcount then //最後一行(不加and、or)
choose case ls_column_type //根據數據類型設置Filter條件
case 'cha' ,'var' ,'str' // 字符型
ls_filter_condition = ls_filter_condition + &
ls_column + ls_compare + "'" + ls_value + "'"
case 'num','dec','lon','rea','ulo' // 數值型
ls_filter_condition = ls_filter_condition + &
ls_column + ls_compare + ls_value
case 'dat','tim' //日期型
ls_filter_condition = ls_filter_condition + "string(" + &
ls_column + ")" + ls_compare + "'" + ls_value + "'"
case else
end choose
else
choose case ls_column_type //根據數據類型設置Filter條件
case 'cha','var','str' // 字符型
ls_filter_condition = ls_filter_condition + &
ls_column + ls_compare + "'" + ls_value + "' " &
+ ls_and_or + " "
case 'num','dec','lon','rea','ulo' // 數值型
ls_filter_condition = ls_filter_condition + &
ls_column + ls_compare + ls_value + " " &
+ ls_and_or + " "
case 'dat','tim' //日期型
ls_filter_condition = ls_filter_condition + "string(" + & ls_column + ")" + ls_compare+ "" + ls_value+ "' " &
+ ls_and_or + " "
case else
end choose
end if
next
dw_query.setredraw(false)
dw_query.setFilter(ls_filter_condition)
if dw_query.filter() = 1 and dw_query.rowcount() > 0 then
ls_column = dw_query_condition.getitemstring(1, 'column_name')
dw_query.setsort(ls_column + ' A')
dw_query.sort()
dw_query.SetColumn(ls_column)
dw_query.selectrow(0,false)
dw_query.selectrow(1,true)
dw_query.setrow(1)
end if
dw_query.setredraw(true)
this.Object.DataWindow.ReadOnly="Yes"
this.settransobject(sqlca)
this.retrieve()
if this.rowcount() > 0 then
this.selectrow(0,false)
this.selectrow(1,true)
this.setrow(1)
end if
9、在cb_all的Clicked事件加入：
dw_query.SetFilter('')
dw_query.Filter()
if dw_query.rowcount() > 0 then
dw_query.selectrow(0,false)
dw_query.selectrow(1,true)
dw_query.setrow(1)
end if
dw_query.SetFocus()
10、在cb_print的Clicked事件加入：
if messagebox("提示信息","確認打印？", question!,Yesno!,1) = 1 then
if PrintSetup () = -1 then
messagebox('出錯信息','打印機設置出錯！',Exclamation!)
return else dw_query.Print() end if
end if
11、在cb_exit的Clicked事件加入：
close(parent)
