如何在不将双引号更改为单引号的情况下将xml字符串更新到数据库中？

Question

I need to update part of an xml string in a database, but I do not want to change from double quotes to single quotes, in other words, I want to preserve the double quotes in the xml string. This question is based of another question I had found here

The following:

ExecuteNonQuery("Update Logs 
                 SET Message = '" + encryptedMessage.Replace('"','\'') + "' 
                 WHERE ID = " + message.Id);

Will replace the double quotes with single quotes and save that to the db, but I do not want to permanently change the quotes.

I am trying this:

string sqlUpdate = "Update Logs SET Message = @Message where Id = @Id";
                SqlParameter id = new SqlParameter("@Id", message.Id);
                SqlParameter msg = new SqlParameter("@Message", message.Msg);

                Collection parameters = new Collection();
                parameters.Add(id);
                parameters.Add(msg);

                Data.ExecuteNonQuery(sqlUpdate,parameters);

Data.ExecuteNonQuery already takes care of the connection for me.

I noticed the sql passed into the ExecuteNonQuery method is Update Logs SET Message = @Message where Id = @Id

I am just using Collection because this the method took a VBCollection.

Answer 1

Use a parametrized query instead and pass in your XML as a SqlParameter :

string sqlUpdate = "Update Logs set Message = @MESSAGE where ID = @ID";
using (SqlCommand cmd = new SqlCommand(sqlUpdate, someConnection))
{
    cmd.Parameters.Add(new SqlParameter("@MESSAGE", SqlDbType.Xml)).Value = encryptedMessage;
    cmd.Parameters.Add(new SqlParameter("@ID", SqlDbType.Int)).Value = message.Id;
    cmd.ExecuteNonQuery();
}