public class method
{ //成员变量
private SqlConnection conn;
private SqlCommand cmd;
public method() //通过构造函数给变量赋值
{
conn = new SqlConnection("server=.;database=Linkdatabase;user=sa;pwd=123");
cmd = conn.CreateCommand();
}
public List<bianliang> Select() //全部查询
{
List<bianliang> list = null; //泛型集合，包含集合的集合
conn.Open();
cmd.CommandText = "select * from wwz";
SqlDataReader dr=cmd.ExecuteReader();
if(dr.HasRows) //如果反馈的dr里面有值，才会执行下面的代码
{
list = new List<bianliang>(); //创建一个新的泛型集合
while (dr.Read()) //只要返回的结果为true dr.read()即为true
{
//将数据一条条增加到集合中
bianliang s = new bianliang();
s.Code = dr["Code"].ToString();
s.Name = dr["Name"].ToString();
s.Class = dr["Class"].ToString();
s.Score = dr["Score"].ToString();
list.Add(s);
}
}
return list;
}
}
private void button1_Click(object sender, EventArgs e) //全部查询
{
List<bianliang> x= new method().Select(); //调用函数 将结果反馈给x
listView1.Items.Clear();//将原来listview1表的内容清空一下
for (int i = 0; i < x.Count; i++) //一次次将获得的数据显示在listview1中
{
listView1.Items.Add(x[i].Code); //items代表的是行
listView1.Items[i].SubItems.Add(x[i].Name); //Items[i].SubItems代表的是Items这一行剩下的内容
listView1.Items[i].SubItems.Add(x[i].Class);
listView1.Items[i].SubItems.Add(x[i].Score);
}
}
public bianliang Select(string code) //根据编号查询(条件查询)，是为了以后的修改用的(加载页面时)
{
bianliang s = null;
conn.Open();
cmd.CommandText = "select * from wwz where Code="+code+"";
SqlDataReader dr = cmd.ExecuteReader();
if (dr.HasRows) //如果反馈的dr里面有值，才会执行下面的代码
{
if (dr.Read()) //只要返回的结果为true才会执行下面的代码。 dr.read()即为true
{
s = new bianliang();
s.Code = dr["Code"].ToString();
s.Name = dr["Name"].ToString();
s.Class = dr["Class"].ToString();
s.Score = dr["Score"].ToString();
}
}
return s;
}
public List<bianliang> Select(string x,string y) //模糊查询(条件查询)
{
List<bianliang> list = null; //泛型集合，包含集合的集合
conn.Open();
cmd.CommandText = "select * from wwz where Class like ‘%"+x+"%‘ and Score like ‘%"+y+"%‘ ";
SqlDataReader dr = cmd.ExecuteReader();
if (dr.HasRows) //如果反馈的dr里面有值，才会执行下面的代码
{
list = new List<bianliang>(); //创建一个新的泛型集合
while (dr.Read()) //只要返回的结果为true dr.read()即为true
{
//将数据一条条增加到集合中
bianliang s = new bianliang();
s.Code = dr["Code"].ToString();
s.Name = dr["Name"].ToString();
s.Class = dr["Class"].ToString();
s.Score = dr["Score"].ToString();
list.Add(s);
}
}
return list;
}
public void Insert(bianliang z) //增加
{
conn.Open();
cmd.CommandText = "insert into wwz values(@code,@name,@class,@score)"; //@code 代位符
cmd.Parameters.Clear();//清空原来代位符的内容
cmd.Parameters.Add("@code",z.Code);//给代位符赋值
cmd.Parameters.Add("@name",z.Name);
cmd.Parameters.Add("@class",z.Class);
cmd.Parameters.Add("@score",z.Score);
cmd.ExecuteNonQuery();
cmd.Dispose();
conn.Close();
}
private void button1_Click(object sender, EventArgs e) //增加
{
if (textBox1.Text != null && textBox2.Text != null&&textBox3.Text != null&&textBox4.Text != null)
{
bianliang x = new bianliang();
x.Code = textBox1.Text;
x.Name = textBox2.Text;
x.Class = textBox3.Text;
x.Score = textBox4.Text;
new method().Insert(x);
MessageBox.Show("增加成功");
}
}
private void button3_Click(object sender, EventArgs e) //增加
{
add f = new add();
f.Show();
}
public void Update(bianliang x) //修改
{
conn.Open();
cmd.CommandText = "update wwz set Name=‘"+x.Name+"‘, Class=‘"+x.Class+"‘,Score=‘"+x.Score+"‘ where Code="+x.Code+"";
cmd.ExecuteNonQuery();
cmd.Dispose();
conn.Close();
}
public partial class update : Form
{
private string S;
public update(string s)
{
InitializeComponent();
S = s;
}
private void update_Load(object sender, EventArgs e) //加载页面时
{
bianliang load = new method().Select(S); //将调用Select(string s)函数后获取到的结果放在load里
textBox1.Text =load.Code;
textBox2.Text =load.Name;
textBox3.Text = load.Class;
textBox4.Text = load.Score;
}
private void button1_Click(object sender, EventArgs e) //点击修改窗体上的修改按钮
{ //创建一个变量，将文本框内的值放在这个变量中
bianliang update = new bianliang();
update.Code = textBox1.Text;
update.Name = textBox2.Text;
update.Class = textBox3.Text;
update.Score = textBox4.Text;
new method().Update(update);
MessageBox.Show("修改成功");
}
}
private void button5_Click(object sender, EventArgs e)//修改
{
if(listView1.SelectedItems.Count>0)
{
string s = listView1.SelectedItems[0].Text;
update f = new update(s);
f.Show();
}
}
public void Delete(string code) //删除
{
conn.Open();
cmd.CommandText = "delete from wwz where code="+code+"";
cmd.ExecuteNonQuery();
cmd.Dispose();
conn.Close();
}
private void button4_Click(object sender, EventArgs e) //删除
{
if(listView1.SelectedItems.Count>0)
{
string code = listView1.SelectedItems[0].Text;
new method().Delete(code);
//执行完删除后再执行一次全部查询
List<bianliang> x = new method().Select(); //调用函数 将结果反馈给x
listView1.Items.Clear();//将原来listview1表的内容清空一下
for (int i = 0; i < x.Count; i++) //一次次将获得的数据显示在listview1中
{
listView1.Items.Add(x[i].Code); //items代表的是行
listView1.Items[i].SubItems.Add(x[i].Name); //Items[i].SubItems代表的是Items这一行剩下的内容
listView1.Items[i].SubItems.Add(x[i].Class);
listView1.Items[i].SubItems.Add(x[i].Score);
}
}
}
时间： 2024-10-06 05:57:22