zoukankan      html  css  js  c++  java
  • [SQL]

    场景:

    使用 Oracle.DataAccess.dll 访问数据库时,OracleDataAdapter 执行失败。

    异常:

    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:

    有问题的SQL
    select distinct username from user u, role r where u.roleid = r.id and u.id = 1

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

    总结:

    规范使用 SQL 语法,指定表别名进行联合查询。

  • 相关阅读:
    053364
    053363
    oracle导出批量表N行记录
    053362
    053361
    053360
    053359
    053358
    053357
    053356
  • 原文地址:https://www.cnblogs.com/jinzesudawei/p/7087774.html
Copyright © 2011-2022 走看看