c#ATM之功能篇（存钱，取钱，转账，交易明细）完结篇
c#ATM之功能篇（存钱，取钱，转账，交易明细）完结篇带详细注释
一个七个功能，不难，代码还有优化空间，之后再发一篇ATM之优化篇
首先先添加一条命名空间
using System.Data.SqlClient;
public Form3()
{
InitializeComponent();
}
public Form3(string str)//构造一个函数用来接收来自Form1的卡号
{
InitializeComponent();
textBox1.Text = str;
//MessageBox.Show(str);打印从form1传来的参数 验证是不是登录时的卡号
}
- button1查询余额的功能
private void button1_Click(object sender, EventArgs e)
{
//连接数据库字符串
string count = "SERVER=.;DATABASE=OX;USER=SA;PWD=1;Integrated Security=True;";
//执行sql语句
string sql = "select * from DATA where ID='" + textBox1.Text.Trim() + "'";
SqlConnection con = new SqlConnection(count);
con.Open();
//创建操作对象cmd
SqlCommand cmd = new SqlCommand(sql, con);
SqlDataReader dr = cmd.ExecuteReader();
if (dr.HasRows)
{
dr.Read();
//读取余额填充到textBox2.Text中
textBox2.Text = dr["MORY"].ToString().Trim();
//有打开就要有关闭哦
dr.Close();
con.Close();
}
- button2取钱功能
//取钱的功能：→要判断自己有多少钱，能取的钱不能大于自己的本金，钱不能取负数
private void button2_Click(object sender, EventArgs e)
{
//先判断textBox2.Text等不等于空，不等于空就执行else里面的语块句
if (textBox2.Text=="")
{
MessageBox.Show("请输入金额");
}
else
{
string count = "SERVER=.;DATABASE=OX;USER=SA;PWD=1;Integrated Security=True;";
string sql01 = "select * from DATA where ID='" + textBox1.Text.Trim() + "'";
SqlConnection con01 = new SqlConnection(count);
con01.Open();
SqlCommand cmd01 = new SqlCommand(sql01, con01);
SqlDataReader dr01 = cmd01.ExecuteReader();
dr01.Read();
//Convert.表示强制转换的意思 ToInt32表示类型 类型可以换
int i = Convert.ToInt32(dr01["mory"].ToString().Trim());
//将string类型的文本框强制转换成int类型，思考一下，不用这类强制转换，还有哪些方法可以强制转换
int j = Convert.ToInt32(textBox2.Text);
int k = i - j;
int txt = Convert.ToInt32(textBox2.Text);
dr01.Close();
if (txt > i | txt < 0)
{
MessageBox.Show("取出来的钱不能大于本金或为负数", "温馨提示");
}
else
{
//原来的本金减去要取出来的金额
//先读取原来的本金为i,再获得取款の为j 即i-j=k 输入数据库 ，
string NOW = "";//先申明一个空变量来接收时间信息
string count01 = "server=.;database=ox;user=sa;pwd=1;Integrated Security=True;";
string sql = "select * from DATA";
SqlConnection con = new SqlConnection(count);
con.Open();
SqlCommand cmd = new SqlCommand(sql, con);
SqlDataReader dr = cmd.ExecuteReader();
if (dr.HasRows)
{
dr.Read();
/*-----------先读取之前转账的信息------------*/
NOW = dr["RECORD"].ToString().Trim();
dr.Close(); con.Close();
}
/*------插入储存信息格式------*/
NOW += DateTime.Now.Year + "/" + DateTime.Now.Month + "/" + DateTime.Now.Day + "/" + DateTime.Now.Hour + "/" + DateTime.Now.Minute + "/" + DateTime.Now.Second;
NOW += "我方卡号：" + textBox1.Text;
NOW += " 金额：" + textBox2.Text + "元 " + "已取出";
string sql02 = "update DATA set mory='" + k + "',RECORD='" + NOW + "'where ID='" + textBox1.Text.Trim() + "'";
SqlConnection con02 = new SqlConnection(count01);
con02.Open();
SqlCommand cmd02 = new SqlCommand(sql02, con02);
SqlDataReader dr02 = cmd02.ExecuteReader();
dr02.Read();
MessageBox.Show("取款成功");
dr02.Close();
con02.Close();
}
}
}
- textBox2_KeyPress屏蔽要字母，有这段代码就是文本框里面不能输入字母和符号
private void textBox2_KeyPress(object sender, KeyPressEventArgs e)
{
if (e.KeyChar > 0x20)
{
try
{
double.Parse(((TextBox)sender).Text + e.KeyChar.ToString());
}
catch
{
e.KeyChar = (char)0; //处理非法字符
}
}
}
- textBox3_KeyPress屏蔽要字母，有这段代码就是文本框里面不能输入字母和符号
private void textBox3_KeyPress(object sender, KeyPressEventArgs e)
{
if (e.KeyChar > 0x20)
{
try
{
double.Parse(((TextBox)sender).Text + e.KeyChar.ToString());
}
catch
{
e.KeyChar = (char)0; //处理非法字符
}
}
}
- textBox4_KeyPress屏蔽要字母，有这段代码就是文本框里面不能输入字母和符号
private void textBox4_KeyPress(object sender, KeyPressEventArgs e)
{
if (e.KeyChar > 0x20)
{
try
{
double.Parse(((TextBox)sender).Text + e.KeyChar.ToString());
}
catch
{
e.KeyChar = (char)0; //处理非法字符
}
}
}
- button3存钱功能
private void button3_Click(object sender, EventArgs e)
{
int txt = Convert.ToInt32(textBox2.Text);
if (txt < 0)
{
MessageBox.Show("不能存小于0的金额");
}
else
{
string NOW="";
string count = "server=.;database=ox;user=sa;pwd=1;Integrated Security=True;";
string sql = "select * from DATA";
SqlConnection con = new SqlConnection(count);
con.Open();
SqlCommand cmd = new SqlCommand(sql, con);
SqlDataReader dr = cmd.ExecuteReader();
if (dr.HasRows)
{
dr.Read();
/*-----------先读取之前转账的信息------------*/
NOW = dr["RECORD"].ToString().Trim();
//NOW1 = dr["RECORD"].ToString().Trim();
}
dr.Close();
con.Close();
/*------插入储存信息格式------*/
NOW += DateTime.Now.Year + "/" + DateTime.Now.Month + "/" + DateTime.Now.Day + "/" + DateTime.Now.Hour + "/" + DateTime.Now.Minute + "/" + DateTime.Now.Second;
NOW += "我方卡号：" + textBox1.Text;
NOW += " 金额：" + textBox2.Text + "元 " + "已存入";
/*-----------先判断自己有多少本金再加上要存储的金额------等这些计算好了在存进数据中-------*/
string count01 = "SERVER=.;DATABASE=OX;USER=SA;PWD=1;Integrated Security=True;";
string sql01 = "select * from DATA where ID='" + textBox1.Text.Trim() + "'";
SqlConnection con01 = new SqlConnection(count01);
con01.Open();
SqlCommand cmd01 = new SqlCommand(sql01, con01);
SqlDataReader dr01 = cmd01.ExecuteReader();
dr01.Read();
int i = Convert.ToInt32(dr01["mory"].ToString().Trim());//读取自己的账户有多少钱
int j = Convert.ToInt32(textBox2.Text);//接受要储存的金额
int k = i + j;//本金加要储存的金额
dr01.Close();
con01.Close();
/*------------------------*/
string sql02 = "update DATA set mory='" + k + "',RECORD='"+NOW+"'where ID='" + textBox1.Text.Trim() + "'";
SqlConnection con02 = new SqlConnection(count);
con02.Open();
SqlCommand cmd02 = new SqlCommand(sql02, con02);
if (cmd02.ExecuteNonQuery() > 0)
{
MessageBox.Show("储存成功");
}
else
{
MessageBox.Show("Test");
}
con02.Close();
}
}
- button4转账功能
private void button4_Click(object sender, EventArgs e)
{
if (textBox4.Text==""&textBox3.Text=="")
{
MessageBox.Show("请输入转账信息");
}
else
{
textBox3.Visible = true;
label3.Visible = true;
textBox4.Visible = true;
label4.Visible = true;
int i2, text2, text4;
if (true)
{
string count = "SERVER=.;USER=SA;PWD=1;DATABASE=OX;Integrated Security=True;";
string sql = "select * from DATA where ID='" + textBox1.Text + "'";
SqlConnection cno = new SqlConnection(count);
SqlCommand cmd = new SqlCommand(sql, cno);
cno.Open();
SqlDataReader dr = cmd.ExecuteReader();
dr.Read();
//I1-TXT=自己账号的本金更新数据 txt+i2=对方的本金 更新数据
int i1 = Convert.ToInt32(dr["mory"].ToString().Trim());//获取自己的本金
i2 = i1;
dr.Close();
cno.Close();
//text4 = textBox4.Text;
int txt4 = Convert.ToInt32(textBox4.Text);//要转账的金额
int txt2 = Convert.ToInt32(textBox2.Text);
text2 = txt2;
text4 = txt4;
}
if (/*text2 > i2 | text2 < 0 |*/ text4 > i2 | text4 < 0)
{
MessageBox.Show("取出来的钱不能大于本金或为负数", "温馨提示");
}
else
{
string NOW = "";
string NOW1 = "";
//MessageBox.Show(NOW);
string count = "server=.;database=ox;user=sa;pwd=1;Integrated Security=True;";
string sql = "select * from DATA";
SqlConnection con = new SqlConnection(count);
con.Open();
SqlCommand cmd = new SqlCommand(sql, con);
SqlDataReader dr = cmd.ExecuteReader();
if (dr.HasRows)
{
dr.Read();
/*-----------先读取之前转账的信息------------*/
NOW = dr["RECORD"].ToString().Trim();
NOW1 = dr["RECORD"].ToString().Trim();
}
dr.Close();
con.Close();
//----------储存转账信息------------
NOW += DateTime.Now.Year + "/" + DateTime.Now.Month + "/" + DateTime.Now.Day + "/" + DateTime.Now.Hour + "/" + DateTime.Now.Minute + "/" + DateTime.Now.Second;
NOW += "对方卡号：" + textBox3.Text;
NOW += "金额：" + text4 + "元 " + "已转入";
/*-----------先判断要存进多少钱，然后自己的账户减多少钱和对方账户加多少钱------等这些计算好了在存进数据中-------*/
string count01 = "SERVER=.;USER=SA;PWD=1;DATABASE=OX;Integrated Security=True;";
string sql01 = "select * from DATA where ID='" + textBox3.Text + "'";
SqlConnection cno01 = new SqlConnection(count01);
cno01.Open();
SqlCommand cmd01 = new SqlCommand(sql01, cno01);
SqlDataReader dr01 = cmd01.ExecuteReader();
dr01.Read();
int i3 = Convert.ToInt32(dr01["mory"].ToString().Trim());//获取对方账号的本金
dr01.Close();
cno01.Close();
int j = i2 - text4;//减去转账的金额等于剩下自己的本金
string count02 = "SERVER=.;USER=SA;PWD=1;DATABASE=OX;Integrated Security=True;";
string sql02 = "update DATA set mory='" + j + "' ,RECORD='" + NOW + "' where ID='" + textBox1.Text + "'";
//string sql = "select count(*) from yonghu where yname='" + textBox4.Text + "' and ypwd='" + textBox5.Text + "'";
//插入信息
SqlConnection cno02 = new SqlConnection(count02);
cno02.Open();
SqlCommand cmd02 = new SqlCommand(sql02, cno02);
int n = cmd02.ExecuteNonQuery();
dr01.Close();
NOW1 = DateTime.Now.Year + "/" + DateTime.Now.Month + "/" + DateTime.Now.Day + "/" + DateTime.Now.Hour + "/" + DateTime.Now.Minute + "/" + DateTime.Now.Second;
NOW1 += "对方卡号：" + textBox3.Text;
NOW1 += "金额：" + text4 + "元 " + "已转出";
int k = i3 + text4;//加上转账过来的金额等于自己的本金
string count03 = "SERVER=.;USER=SA;PWD=1;DATABASE=OX;";
string sql03 = "update DATA set mory='" + k + "', RECORD='" + NOW1 + "' where ID='" + textBox3.Text + "'";
SqlConnection cno03 = new SqlConnection(count03);
cno03.Open();
SqlCommand cmd03 = new SqlCommand(sql03, cno03);
if (cmd03.ExecuteNonQuery() > 0)
{
MessageBox.Show("转账成功");
}
else
{
MessageBox.Show("Test");
}
}
}
}
- button5交易明细
private void button5_Click(object sender, EventArgs e)
{
textBox3.Visible = true;
label3.Visible = true;
textBox4.Visible = true;
label4.Visible = true;
textBox5.Visible = true;
//MessageBox.Show(NOW);
string count = "server=.;database=ox;user=sa;pwd=1;Integrated Security=True;";
string sql = "select * from DATA";
SqlConnection con = new SqlConnection(count);
con.Open();
SqlCommand cmd = new SqlCommand(sql,con);
SqlDataReader dr = cmd.ExecuteReader();
if (dr.HasRows)
{
dr.Read();
textBox5.Text = dr["RECORD"].ToString().Trim();
dr.Close();
}
con.Close();
}
- button6返回登录界面
private void button6_Click(object sender, EventArgs e)
{
this.Close();
Form1 f1 = new Form1();
f1.Show();
}
c#ATM之找回密码篇https://blog.csdn.net/I_TenKai/article/details/84559021
c#ATM之登录篇https://blog.csdn.net/I_TenKai/article/details/84559021