sql 简单的更新语句不起作用

Question

更新根本不起作用，行保持不变。我没有得到error.Does有人知道它不起作用的原因吗？我想首先知道问题的原因，但如果您有任何想法，关于如何改进我的代码的建议，我们将受到欢迎。

 private void button2_Click(object sender, EventArgs e)
    {
        using (SqlConnection conn = new SqlConnection(@"Data Source=(LocalDB)\v11.0;AttachDbFilename=E:\C #\InsertDeleteUpdate-Login\InsertDeleteUpdate-Login\Database1.mdf;Integrated Security=True"))
        using (SqlCommand cmd = new SqlCommand("UPDATE info SET Password=@Password WHERE Id=@Id AND Password=@Password1",conn))
        {
            conn.Open();
            cmd.Parameters.AddWithValue("@Password", textBox4.Text);
            cmd.Parameters.AddWithValue("@Id", textBox3.Text);
            cmd.Parameters.AddWithValue("@Password1", textBox2.Text);
        }
    }

Answer 1

您需要执行查询

cmd.Parameters.AddWithValue("@Password", textBox4.Text);
cmd.Parameters.AddWithValue("@Id", textBox3.Text);
cmd.Parameters.AddWithValue("@Password1", textBox2.Text);

cmd.ExecuteNonQuery(); // this is what was missing

Answer 2

您没有执行查询。您需要使用：

cmd.ExcecuteNonQuery();

添加参数后

Answer 3

private void button2_Click(object sender, EventArgs e)
{
    using (SqlConnection conn = new SqlConnection(@"Data Source=(LocalDB)\v11.0;AttachDbFilename=E:\C #\InsertDeleteUpdate-Login\InsertDeleteUpdate-Login\Database1.mdf;Integrated Security=True"))
    using (SqlCommand cmd = new SqlCommand("UPDATE info SET Password=@Password WHERE Id=@Id AND Password=@Password1",conn))
    {
        conn.Open();
        cmd.Parameters.AddWithValue("@Password", textBox4.Text);
        cmd.Parameters.AddWithValue("@Id", textBox3.Text);
        cmd.Parameters.AddWithValue("@Password1", textBox2.Text);
        cmd.ExecuteNonQuery();

    }
}

sql 简单的更新语句不起作用

sql simple update statement doesn't work

c#

sql

sql-update