.NET怎么连接一次数据库执行多条语句

Question

protected void Button1_Click(object sender, EventArgs e)
{
string SqlStr = ConfigurationManager.ConnectionStrings["conn"].ToString();

SqlConnection conn = new SqlConnection(SqlStr);

conn.Open();
string sql3 = "select 编号 from CS where 编号 = '" + TextBox1.Text.Trim() + "'";
SqlCommand cmd3 = new SqlCommand(sql3, conn);
cmd3.CommandText = sql3;
cmd3.Connection = conn;
try
{
string BH = cmd3.ExecuteScalar().ToString();
string sql2 = "update CS set 数量 = 数量+1 where 编号 = " + TextBox1.Text.Trim();
SqlCommand cmd2 = new SqlCommand(sql2, conn);

        Response.Write("<script>alert('插入成功')</script>");
    }
    catch
    {
        string sql1 = "insert into CS (编号,索书号，书名，作者，数量) values (";
        sql1 += "'" + TextBox1.Text.Trim() + "','" + TextBox2.Text.Trim() + "','" + TextBox3.Text.Trim() +
            "','" + TextBox4.Text.Trim() + "','" + "1" + "')";
        SqlCommand cmd1 = new SqlCommand(sql1, conn);
        Response.Write("<script>alert('插入成功')</script>");
    }

    conn.Close();

}

第一条语句执行没问题，后面两条语句不报错但没有结果，我的是SQL数据库

Answer 1

SqlCommand cmd = new SqlCommand(sql, conn);
你应该要在这一句后面加上 cmd.ExecuteNonQuery();
cmd.ExecuteNonQuery()才是cmd的执行，你现在只是赋值，并没有执行cmd语句