Oracle客户端是否需要在列名前后加上括号? [英] Oracle client requires parentheses around column names?
问题描述
最近有人要求我将MSSQL数据库迁移到Oracle数据库.
I was recently asked to migrate our MSSQL database to an Oracle one.
我使用的是传统方法来执行sql查询.
I'm using the old-traditional way to execute sql queries.
出于某种原因(我不知道),Oracle要求我在列名两边加上括号(为什么?) 有解决方法吗?
for some reason, unknown to me, Oracle requires me to put parentheses around column names (why?) Is there a workaround for this?
以下代码由于括号(在MSSQL下正常工作)而将失败
The following code will fail because of the parentheses (used to work well under MSSQL)
using (var msq = new OracleConnection(sConnectionString))
{
msq.Open();
OracleCommand msc = msq.CreateCommand();
msc.CommandText = @"SELECT level_1,element_id FROM tnuot_menu_tree
WHERE level_1 IN
(SELECT mt.level_1 FROM tnuot_menu_tree mt
WHERE mt.element_id IN
(SELECT element_tree_id FROM tnuot_menu_elements
WHERE UPPER(element_link) LIKE :url))
AND level_2 = 0 AND level_3 = 0";
msc.Parameters.Add("url", SqlDbType.VarChar);
msc.Parameters["url"].Value = "%" + sName.ToUpper();
OracleDataReader mrdr = msc.ExecuteReader();
while (mrdr.Read())
{
sResult.arDirectResult.Add(mrdr[0].ToString());
sResult.arDirectResult.Add(mrdr[1].ToString());
break;
}
msc.Dispose();
mrdr.Dispose();
msq.Close();
}
相反,在VS服务器资源管理器中,最后一个查询被翻译"为
Instead, in the VS server explorer, the last query gets 'translated' to
SELECT "level_1", "element_id"
FROM "tnuot_menu_tree"
WHERE ("level_1" IN
(SELECT "level_1" FROM "tnuot_menu_tree" mt
WHERE ("element_id" IN
(SELECT "element_tree_id" FROM "tnuot_menu_elements"
WHERE (UPPER("element_link") LIKE '%DEFAULT.ASPX')))))
AND ("level_2" = 0) AND ("level_3" = 0)
哪个效果很好.
关于如何摆脱这一令人讨厌的任务的任何想法?
Any ideas on how to get rid of this nasty task?
推荐答案
可能的是,括号不是必需的;这是双引号.这与Oracle等效于SQLServer使用方括号-在这里可能有必要,因为表是用小写名称创建的,但是没有双引号,Oracle会自动将名称转换为大写.
Possibly, it isn't the brackets that are necessary; it's the double quotes. This is Oracle's equivalent of SQLServer's use of square brackets - it may be necessary here because the tables have been created with lower-case names, but without the double quotes Oracle automatically converts names to upper-case.
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