[英]Having trouble with string.Replace / Regex.Replace
I have a sql query like this: 我有一个这样的SQL查询:
UPDATE StockUpdateQueue SET Synced = 1, SyncedAt = GETDATE() WHERE Id IN (@p0,@p1);
This query is dynamically generated. 该查询是动态生成的。 What I want to do is run it through a function, which will effectively replace all the @pN
parameters with their corresponding values. 我想做的是通过一个函数运行它,该函数将有效地将所有@pN
参数替换为其相应的值。
I have tried to do this with standard string.Replace
as well as Regex.Replace
with no luck - the replace is not taking place. 我试图用标准的string.Replace
以及Regex.Replace
做到这一点,但运气不好-替换没有发生。
This is what I tried so far: 这是我到目前为止尝试过的:
class Program
{
static string _lastQuery;
static void Main(string[] args)
{
var sqlQuery = "UPDATE StockUpdateQueue SET Synced = 1, SyncedAt = GETDATE() WHERE Id IN (@p0,@p1);";
var sqlParamters = new Dictionary<string, object>()
{
{ "@p0", 12345 },
{ "@p1", 65432 }
};
LogLastQuery(sqlQuery, sqlParamters);
}
static void LogLastQuery(string sqlQuery, Dictionary<string, object> sqlParamters = null)
{
_lastQuery = sqlQuery;
if (sqlParamters != null && sqlParamters.Count > 0)
foreach (KeyValuePair<string, object> sqlParamter in sqlParamters)
_lastQuery = Regex.Replace(
_lastQuery,
"\\@" + sqlParamter.Key,
sqlParamter.Value.GetType() == typeof(int) || sqlParamter.Value.GetType() == typeof(decimal)
? sqlParamter.Value.ToString()
: "'" + sqlParamter.Value.ToString() + "'");
}
}
I want the function to do the parameter replace and ideally output something like this: 我希望函数执行参数替换并理想地输出如下内容:
UPDATE StockUpdateQueue SET Synced = 1, SyncedAt = GETDATE() WHERE Id IN (12345,65432);
Any ideas? 有任何想法吗?
I use the sqlQuery
and sqlParamters
just as user un-lucky
has shown, ie 我使用sqlQuery
和sqlParamters
就像用户un-lucky
已经显示出,即
{
mySqlCommand.Parameters.AddWithValue(sqlParamter .Key, sqlParamter.Value);
}
It turns out, I have been generating the dictionary keys without the @
and .NET has been automatically adding them for me (when they are missing - as explained by user juharr
). 事实证明,我一直在生成没有@
的字典键,并且.NET已自动为我添加它们(当它们丢失时-如用户juharr
)。
Sometimes, I generate the sql query and parameters dynamically - where the list of keys and their corresponding values were generated in a for
/ foreach
loop. 有时,我会动态生成sql查询和参数-在for
/ foreach
循环中生成键列表及其对应的值。 This resulted in a case of mix usage going on. 这样就导致了混合使用的情况。
So, to handle this - I've updated my function like this and it's working as intended: 因此,为了解决这个问题-我已经像这样更新了我的函数,它可以按预期工作:
internal void LogLastQuery(string sqlQuery, Dictionary<string, object> sqlParamters = null)
{
_lastQuery = sqlQuery;
if (sqlParamters != null && sqlParamters.Count > 0)
foreach (KeyValuePair<string, object> sqlParamter in sqlParamters)
_lastQuery = Regex.Replace(
_lastQuery,
(sqlParamter.Key.ToString()[0] != '@' ? "\\@" : "") + sqlParamter.Key,
sqlParamter.Value.GetType() == typeof(int) || sqlParamter.Value.GetType() == typeof(decimal)
? sqlParamter.Value.ToString()
: "'" + sqlParamter.Value.ToString() + "'");
}
This now deals with both cases. 现在处理这两种情况。 I am not sure if this is the best method, but it works fine for now. 我不确定这是否是最好的方法,但目前效果很好。
您在字典中的键已经有“ @”符号,请尝试使用sqlParamter.Key
代替"\\\\@" + sqlParamter.Key
。
I think its better to create SqlCommand with that query and add those values as parameters will be the best option for you to execute the query, instead for replacement; 我认为最好使用该查询创建SqlCommand并将这些值添加为参数,这将是您执行查询的最佳选择,而不是替换。 which means you can try something like this: 这意味着您可以尝试如下操作:
var sqlQuery = "UPDATE StockUpdateQueue SET Synced = 1, SyncedAt = GETDATE() WHERE Id IN (@p0,@p1);";
var sqlParamters = new Dictionary<string, object>()
{
{ "@p0", 12345 },
{ "@p1", 65432 }
};
SqlCommand mySqlCommand = new SqlCommand(sqlQuery , conSQL); // conSQL is the connection
foreach (KeyValuePair<string, object> sqlParamter in sqlParamters)
{
mySqlCommand.Parameters.AddWithValue(sqlParamter .Key, sqlParamter.Value);
}
mySqlCommand .ExecuteNonQuery();
声明:本站的技术帖子网页,遵循CC BY-SA 4.0协议,如果您需要转载,请注明本站网址或者原文地址。任何问题请咨询:yoyou2525@163.com.