[英]How can I use ExecuteScalar in this scenario?
我有此SQL Select语句来选择用户ID等于特定ID的购物篮ID。
我想将查询结果存储在一个变量中,所以我想可以做到:
BasketPage.SelectCommand="SELECT BasketID FROM tblBasket WHERE (UserID = '9f96bd94-91b9-4328-8214-4eac179c3a26')"
var BasketID = BasketPage.ExecuteScalar().ToString();
但是显然我需要创建一个SQL Command的新实例才能起作用,如何为BasketPage Select Command做到这一点?
我不知道您的BasketPage
,但是您无法使用ExecuteScalar
方法对基础数据库执行此查询。 假设SQL Server:
using (var connection = new SqlConnection(connString))
using (var command = connection.CreateCommand()) {
command.CommandText = "select BasketId from tblBasket where UserId = N'9f96bd94-91b9-4328-8214-4eac179c3a26'";
command.CommandType = CommandType.Text;
try {
var basketId = (string)command.ExecuteScalar(); // Assuming BasketId is a string, since you called ToString() in your question.
} finally {
command.Dispose();
connection.Dispose();
}
}
假设您正在使用SQL Server,是否尝试过类似
BasketPage.SelectCommand =
new SqlCommand("SELECT BasketID FROM tblBasket WHERE (UserID = '9f96bd94-91b9-4328-8214-4eac179c3a26')",
"yourconnectionstring");
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