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[英]Unable to Update Model from Database using EF 6 and Visual Studio 2015 Update 3
[英]My update query is not working. I'm using Visual Studio 2015, and am trying to update an access database
以下是我用於更新查詢的代碼,一切似乎都工作正常,但數據庫未更新。
public int ChangeProduct(string _ProductID, double _ProductPrice)
{
int a = 0;
string queryString = "UPDATE product SET productPrice = @productPrice WHERE productID = @productId";
using (OleDbConnection connection = new OleDbConnection(connectionString))
{
OleDbCommand updateProduct = new OleDbCommand(queryString, connection);
updateProduct.Parameters.AddWithValue("@productId", _ProductID);
updateProduct.Parameters.AddWithValue("@productPrice", _ProductPrice);
connection.Open();
a = updateProduct.ExecuteNonQuery();
connection.Close();
}
return a;
}
顯然,Access並不關心參數化名稱的名稱和它們出現的順序。因此,通過將代碼更改為下面的代碼,它可以工作。
public int ChangeProduct(string _ProductID, double _ProductPrice)
{
int a = 0;
string queryString = "UPDATE product SET productPrice = @productPrice WHERE productID = @productId";
using (OleDbConnection connection = new OleDbConnection(connectionString))
{
OleDbCommand updateProduct = new OleDbCommand(queryString, connection);
updateProduct.Parameters.AddWithValue("@productPrice", _ProductPrice);
updateProduct.Parameters.AddWithValue("@productId", _ProductID);
connection.Open();
a = updateProduct.ExecuteNonQuery();
connection.Close();
}
return a;
}
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