thisReader.Read();里面没有数据啊 也就是说你的sql语句没有查询到数据 加一行判断 if(thisReader.CanRead==true) or if (thisReader.peek) which property I Have forgot LZ Please test and find the current property yourself~~~~~
那是我按照书上打的,而且别的程序用这个写法也没错啊尽信书不如无书大哥,能不能给点实质性建议 SqlConnection conn = new SqlConnection("数据库连接串"); conn.Open(); SqlCommand cmd = new SqlCommand("select * from Table1",conn);
SqlDataReader dr = cmd.ExecuteReader(); if (dr.Read()) { this.label1.Text = dr["usercode"].ToString() + " " + dr["username"].ToString(); } dr.Close(); conn.Close();
那是我按照书上打的,而且别的程序用这个写法也没错啊尽信书不如无书大哥,能不能给点实质性建议 SqlConnection conn = new SqlConnection("数据库连接串"); conn.Open(); SqlCommand cmd = new SqlCommand("select * from Table1",conn);
SqlDataReader dr = cmd.ExecuteReader(); if (dr.Read()) { this.label1.Text = dr["usercode"].ToString() + " " + dr["username"].ToString(); } dr.Close(); conn.Close(); 能帮我改下我的嘛
那是我按照书上打的,而且别的程序用这个写法也没错啊尽信书不如无书大哥,能不能给点实质性建议 SqlConnection conn = new SqlConnection("数据库连接串"); conn.Open(); SqlCommand cmd = new SqlCommand("select * from Table1",conn);
SqlDataReader dr = cmd.ExecuteReader(); if (dr.Read()) { this.label1.Text = dr["usercode"].ToString() + " " + dr["username"].ToString(); } dr.Close(); conn.Close(); 能帮我改下我的嘛2楼不是说了么?你先试试行不行呗
那是我按照书上打的,而且别的程序用这个写法也没错啊尽信书不如无书大哥,能不能给点实质性建议 SqlConnection conn = new SqlConnection("数据库连接串"); conn.Open(); SqlCommand cmd = new SqlCommand("select * from Table1",conn);
SqlDataReader dr = cmd.ExecuteReader(); if (dr.Read()) { this.label1.Text = dr["usercode"].ToString() + " " + dr["username"].ToString(); } dr.Close(); conn.Close(); 能帮我改下我的嘛2楼不是说了么?你先试试行不行呗 不行啊
那是我按照书上打的,而且别的程序用这个写法也没错啊尽信书不如无书大哥,能不能给点实质性建议 SqlConnection conn = new SqlConnection("数据库连接串"); conn.Open(); SqlCommand cmd = new SqlCommand("select * from Table1",conn);
SqlDataReader dr = cmd.ExecuteReader(); if (dr.Read()) { this.label1.Text = dr["usercode"].ToString() + " " + dr["username"].ToString(); } dr.Close(); conn.Close(); 能帮我改下我的嘛2楼不是说了么?你先试试行不行呗 不行啊不行是怎么个不行法????F11,把错误贴出来
那是我按照书上打的,而且别的程序用这个写法也没错啊尽信书不如无书大哥,能不能给点实质性建议 SqlConnection conn = new SqlConnection("数据库连接串"); conn.Open(); SqlCommand cmd = new SqlCommand("select * from Table1",conn);
SqlDataReader dr = cmd.ExecuteReader(); if (dr.Read()) { this.label1.Text = dr["usercode"].ToString() + " " + dr["username"].ToString(); } dr.Close(); conn.Close(); 能帮我改下我的嘛2楼不是说了么?你先试试行不行呗 不行啊不行是怎么个不行法????F11,把错误贴出来没有错误,语法都没有错误,就是数据穿不出来
那是我按照书上打的,而且别的程序用这个写法也没错啊尽信书不如无书大哥,能不能给点实质性建议 SqlConnection conn = new SqlConnection("数据库连接串"); conn.Open(); SqlCommand cmd = new SqlCommand("select * from Table1",conn);
也就是说你的sql语句没有查询到数据
加一行判断
if(thisReader.CanRead==true) or if (thisReader.peek) which property I Have forgot LZ Please test and find the current property yourself~~~~~
conn.Open(); SqlCommand cmd = new SqlCommand("select * from Table1",conn);
SqlDataReader dr = cmd.ExecuteReader();
if (dr.Read())
{
this.label1.Text = dr["usercode"].ToString() + " " + dr["username"].ToString();
}
dr.Close();
conn.Close();
conn.Open(); SqlCommand cmd = new SqlCommand("select * from Table1",conn);
SqlDataReader dr = cmd.ExecuteReader();
if (dr.Read())
{
this.label1.Text = dr["usercode"].ToString() + " " + dr["username"].ToString();
}
dr.Close();
conn.Close();
能帮我改下我的嘛
conn.Open(); SqlCommand cmd = new SqlCommand("select * from Table1",conn);
SqlDataReader dr = cmd.ExecuteReader();
if (dr.Read())
{
this.label1.Text = dr["usercode"].ToString() + " " + dr["username"].ToString();
}
dr.Close();
conn.Close();
能帮我改下我的嘛2楼不是说了么?你先试试行不行呗
conn.Open(); SqlCommand cmd = new SqlCommand("select * from Table1",conn);
SqlDataReader dr = cmd.ExecuteReader();
if (dr.Read())
{
this.label1.Text = dr["usercode"].ToString() + " " + dr["username"].ToString();
}
dr.Close();
conn.Close();
能帮我改下我的嘛2楼不是说了么?你先试试行不行呗 不行啊
conn.Open(); SqlCommand cmd = new SqlCommand("select * from Table1",conn);
SqlDataReader dr = cmd.ExecuteReader();
if (dr.Read())
{
this.label1.Text = dr["usercode"].ToString() + " " + dr["username"].ToString();
}
dr.Close();
conn.Close();
能帮我改下我的嘛2楼不是说了么?你先试试行不行呗 不行啊不行是怎么个不行法????F11,把错误贴出来
conn.Open(); SqlCommand cmd = new SqlCommand("select * from Table1",conn);
SqlDataReader dr = cmd.ExecuteReader();
if (dr.Read())
{
this.label1.Text = dr["usercode"].ToString() + " " + dr["username"].ToString();
}
dr.Close();
conn.Close();
能帮我改下我的嘛2楼不是说了么?你先试试行不行呗 不行啊不行是怎么个不行法????F11,把错误贴出来没有错误,语法都没有错误,就是数据穿不出来
conn.Open(); SqlCommand cmd = new SqlCommand("select * from Table1",conn);
SqlDataReader dr = cmd.ExecuteReader();
if (dr.Read())
{
this.label1.Text = dr["usercode"].ToString() + " " + dr["username"].ToString();
}
dr.Close();
conn.Close();
能帮我改下我的嘛2楼不是说了么?你先试试行不行呗 不行啊不行是怎么个不行法????F11,把错误贴出来没有错误,语法都没有错误,就是数据穿不出来让我改好了 ,表的问题