private void button1_Click(object sender, EventArgs e)
{
//连接数据库
string sqls = "server=.;database=schoolData;user=sa;pwd=";//.本机的地址，数据库的文件名，sa：登录用户名
SqlConnection conn = new SqlConnection(sqls);//数据库连接类
SqlCommand cmd = conn.CreateCommand();//数据库访问类
cmd.CommandText = "select *from student";//书写t-sql语句
conn.Open();//开启连接
SqlDataReader dr = cmd.ExecuteReader();//执行访问返回数据
while (dr.Read())//通过read下移指针一行行读取数据
{
ListViewItem lt = new ListViewItem();
lt.Text = dr["sno"].ToString();//数据库中的类
lt.SubItems.Add(dr["sname"].ToString());
lt.SubItems.Add(dr["ssex"].ToString());
lt.SubItems.Add(dr["class"].ToString());
listView1.Items.Add(lt);
}
conn.Close();//关闭连接
数据库单项查询的连接
private void button1_Click(object sender, EventArgs e)
{
//连接数据库
string sqls = "server=.;database=schoolData;user=sa;pwd=";
SqlConnection conn = new SqlConnection(sqls);//数据库连接类
SqlCommand cmd = conn.CreateCommand();//数据库访问类
cmd.CommandText = "select *from " + textBox1.Text;//书写t-sql语句
conn.Open();//开启连接
SqlDataReader dr = cmd.ExecuteReader();//执行访问返回数据
int count = dr.FieldCount;
listView1.Columns.Clear();
listView1.Items.Clear();
for (int j = 0; j < count; j++)
{
listView1.Columns.Add(dr.GetName(j));
}
while (dr.Read())//通过read下移指针一行行读取数据
{
ListViewItem lt = new ListViewItem();
for (int i = 0; i < count; i++)
{
if (i == 0)
{
lt.Text = dr[i].ToString();
}
else
{
lt.SubItems.Add(dr[i].ToString());
}
}
listView1.Items.Add(lt);
}
conn.Close();//关闭连接
}
private void textBox1_TextChanged(object sender, EventArgs e)
{
}