问题描述
我正在尝试将Dapper.net与Oracle一起使用.
I am trying to use Dapper.net with Oracle.
从这篇帖子中我了解到我们可以使用不带前缀的参数，然后使用dapper适用于sql server和oracle
From this post i understood that we could use parameters with no prefixes and dapper would then work for both sql serverand oracle
在没有显式的oracle命名参数前缀:
I'm having a hard time making it to work without the explicit oracle named parameters prefix :
以下查询
sqlConnection.Query("Select * FROM document WHERE id = param1", new { param1 = 963 });
投掷ORA-00904: "PARAM1": invalid identifier
如果我尝试使用@前缀，则会抛出ORA-00936: missing expression
If i try with the @ prefix it throws ORA-00936: missing expression
如果我使用:前缀，它将按预期工作.但是我不希望我的查询依赖(尽可能)在Oracle或Sql Server上.
If i use the : prefix it works as expected. But i do not want my queries to be dependent (as far as possible) upon Oracle or Sql Server.
我正在使用最新的nuget软件包版本Dapper.dll 1.12.1.1
I am using the latest nuget package version Dapper.dll 1.12.1.1
我在做什么错或者我误解了这个帖子?
What am I doing wrong or did i misunderstand this post?
推荐答案
是的，您误解了该帖子. SQL是按原样传递的，并且必须包含正确的:param1或@param1等.完全没有前缀 "是指您不使用的代码请参见-具体来说，请确保代码确实(通过某种机制):
Yes, you misunderstood the post. The SQL is passed through as-is, and must contain the correct :param1 or @param1 etc. The "no prefix at all" is talking about the code that you don't see - specifically, making sure that the code does (via some mechanism):
cmd.Parameters.Add("param1", 963);
vs
cmd.Parameters.Add("@param1", 963);
vs
cmd.Parameters.Add(":param1", 963);
第一个(无前缀)是正确的首选选项.
The first (no prefix) is the correct and preferred option.
如果您希望代码中的SQL与参数无关，则可以使用以下信息:
If you want the SQL in your code to be parameter agnostic, you could use the information from here: Get the parameter prefix in ADO.NET
SQL很少足够接近，但是，仅查找参数前缀即可解决所有问题.
The SQL is rarely close enough, however, that just looking up the parameter prefix will fix all problems.
这篇关于Dapper.net Oracle参数的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！