場景：

使用 Oracle.DataAccess.dll 訪問數據庫時，OracleDataAdapter 執行失敗。

異常：

System.AccessViolationException was unhandled
HResult=-2147467261
Message=Attempted to read or write protected memory. This is often an indication that other memory is corrupt.
Source=Oracle.DataAccess

分析：

有問題的SQL
select distinct username from user u, role r where u.roleid = r.id and u.id = 1

正確的SQL
select distinct u.username from user u, role r where u.roleid = r.id and u.id = 1

總結：

規範使用 SQL 語法，指定表別名進行聯合查詢。

[SQL] - Attempted to read or write protected memory. This is often an indication that other memory is corrupt. 問題之解決