一、计划
二、界面布局及代码
class SqlHelper
{//获取连接字符串
private static readonly string constr = ConfigurationManager.ConnectionStrings["connectionStr"].ConnectionString;
//ExecuteNonQuery()方法
//ExecuteScalar()方法
//ExecuteReader()方法
//ExecuteDataTable()方法
public static int ExecuteNonQuery(string sql, params SqlParameter[] pms)
{
//使用using关键字定义一个范围，在范围结束时骸自动调用这个类实例的Dispose处理对象
using (SqlConnection con = new SqlConnection(constr))
{
//创建执行DSql命令对象
using (SqlCommand cmd = new SqlCommand(sql, con))
{
//判断是否传递了sql参数
if (pms != null)
{
//讲参数添加到Parameters集合中
cmd.Parameters.AddRange(pms);
}
con.Open();
return cmd.ExecuteNonQuery();
}
}
}
//执行返回单个值的
public static object ExecuteScalar(string sql, params SqlParameter[] pms)
{
using (SqlConnection con = new SqlConnection(constr))
{
using (SqlCommand cmd = new SqlCommand(sql, con))
{
if (pms != null)
{
cmd.Parameters.AddRange(pms);
}
con.Open();
return cmd.ExecuteScalar();
}
}
}
//执行返回SqlDataReader
public static SqlDataReader ExecuteReader(string sql, params SqlParameter[] pms)
{
SqlConnection con = new SqlConnection(constr);
using (SqlCommand cmd = new SqlCommand(sql, con))
{
if (pms != null)
{
cmd.Parameters.AddRange(pms);
}
try
{
con.Open();
return cmd.ExecuteReader(System.Data.CommandBehavior.CloseConnection);
}
catch (Exception)
{
con.Close();
con.Dispose();
throw;
}
}
}
//执行返回DataTable
public static DataTable ExecuteDataTable(string sql, params SqlParameter[] pms)
{
DataTable dt = new DataTable();
using (SqlDataAdapter adapter = new SqlDataAdapter(sql, constr))
{
if (pms != null)
{
adapter.SelectCommand.Parameters.AddRange(pms);
}
adapter.Fill(dt);
}
return dt;
}
}
class Info
{
public string Name { get; set; }
public int First { get; set; }
public int Second { get; set; }
public int Third { get; set; }
public int Fourth { get; set; }
public int Fifth { get; set; }
public int Score { get; set; }
}
private void Select1_Click_1(object sender, EventArgs e)
{
string sql = "select * from Bifen where Name=@Name";
SqlParameter[] paras = new SqlParameter[]
{
new SqlParameter("@Name",Name)；
};
using (SqlDataReader reader = SqlHelper.ExecuteReader(sql, paras))
{
if (reader.Read())
{
Info bf = new Info();
bf.Name = (string)reader["Name"];
bf.Second = reader.GetInt32(1);
bf.Third = reader.GetInt32(2);
bf.Fourth = reader.GetInt32(3);
bf.Fifth = reader.GetInt32(4);
bf.Score = reader.GetInt32(5);
}
}
}
}
private void button1_Click(object sender, EventArgs e)
{
if(comboBox1.selectIndex＝=0)
{
txtbox1.Text = bf.first.ToString();
}
if(comboBox1.selectIndex＝=1)
{
txtbox1.Text = bf.second.ToString();
}
if(comboBox1.selectIndex＝2)
{
txtbox1.Text = bf.third.ToString();
}
if(comboBox1.selectIndex＝3)
{
txtbox1.Text = bf.fourth.ToString();
}
if(comboBox1.selectIndex＝4)
{
txtbox1.Text = bf.fifth.ToString();
}
private void button2_Click(object sender, EventArgs e)
{
txtbox2.Text = bf.score.ToString();
}