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(修訂版本間差異)
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http://www.textorolon.com  
http://www.textorolon.com  
=== View ===
=== View ===
-
View 分為 Local Views 及 Remote Views, 事實上如果您在 Project 的 Data 也可以看到 Queries, 那應該也算 View。
+
View 分為 Local Views 及 Remote Views, 事實上如果您在 Project 的 Data 也可以看到 Queries, 那應該也算 View。
-
View 的功能就像將原資料庫做 Select 的動作, 丟到 Cursor, 還可以設定回寫資料庫的功能。
+
View 的功能就像將原資料庫做 Select 的動作, 丟到 Cursor, 還可以設定回寫資料庫的功能。
-
個人是不建議使用 View, 雖然它方便, 除非您是動態產生 Views, 不然有幾項缺點:
+
個人是不建議使用 View, 雖然它方便, 除非您是動態產生 Views, 不然有幾項缺點:
-
#異動資料庫欄位時, 會造成 View 的損毀(除非系統都不會異動)。
+
#異動資料庫欄位時, 會造成 View 的損毀(除非系統都不會異動)。
-
#VFP 的 View 不像 ADO 還有上幾筆或下幾筆的功能, 所以一次就是倒入多筆資料, 當然可用 Top 第幾筆, 但是要再往下抓資料就有問題。
+
#VFP 的 View 不像 ADO 還有上幾筆或下幾筆的功能, 所以一次就是倒入多筆資料, 當然可用 Top 第幾筆, 但是要再往下抓資料就有問題。
-
#必須開一個 DBC。
+
#必須開一個 DBC。
-
..暫時還沒想到其它....
+
..暫時還沒想到其它....
-
View 可以用 View Designer 設定, 這是很方便的功能, 不然也可以下指令的方式
+
View 可以用 View Designer 設定, 這是很方便的功能, 不然也可以下指令的方式
<pre>
<pre>
CREATE SQL VIEW mysqlview AS SELECT * FROM customer!orders
CREATE SQL VIEW mysqlview AS SELECT * FROM customer!orders
</pre>
</pre>
-
如果要設定 View 可回寫資料庫的功能, 還是用 View Designer 比較快
+
如果要設定 View 可回寫資料庫的功能, 還是用 View Designer 比較快

在2009年5月31日 (日) 02:11所做的修訂版本

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View

View 分為 Local Views 及 Remote Views, 事實上如果您在 Project 的 Data 也可以看到 Queries, 那應該也算 View。 View 的功能就像將原資料庫做 Select 的動作, 丟到 Cursor, 還可以設定回寫資料庫的功能。

個人是不建議使用 View, 雖然它方便, 除非您是動態產生 Views, 不然有幾項缺點:

  1. 異動資料庫欄位時, 會造成 View 的損毀(除非系統都不會異動)。
  2. VFP 的 View 不像 ADO 還有上幾筆或下幾筆的功能, 所以一次就是倒入多筆資料, 當然可用 Top 第幾筆, 但是要再往下抓資料就有問題。
  3. 必須開一個 DBC。

..暫時還沒想到其它....

View 可以用 View Designer 設定, 這是很方便的功能, 不然也可以下指令的方式

CREATE SQL VIEW mysqlview AS SELECT * FROM customer!orders

如果要設定 View 可回寫資料庫的功能, 還是用 View Designer 比較快