基本信息
源码名称：C#窗体增删改查(入门级数据库操作示例)
源码大小：0.93M
文件格式：.zip
开发语言：C#
更新时间：2017-11-19
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源码介绍
含数据库文件 附加即可
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using System.Data.SqlClient;
namespace 增删改查数据窗体
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
private void Form1_Load(object sender, EventArgs e)
{
LoadData();
}
public void LoadData()
{
List<Employ> list = new List<Employ>();
string constr = "data source=.;initial catalog=myfirstdatabase;integrated security=true";
using (SqlConnection con = new SqlConnection(constr))
{
string sql = "select * from 员工表";
using (SqlCommand cmd = new SqlCommand(sql, con))
{
con.Open();
using (SqlDataReader Reader = cmd.ExecuteReader())
{
if (Reader.HasRows)
{
while (Reader.Read())
{
Employ newemploy = new Employ();
newemploy.ID = Reader.GetInt32(0);
newemploy.Name = Reader.IsDBNull(1) ? null : Reader.GetString(1);
newemploy.Gender = Reader.IsDBNull(2) ? null : Reader.GetString(2);
newemploy.Age = Reader.GetInt32(3);
newemploy.School = Reader.IsDBNull(4) ? null : Reader.GetString(4);
newemploy.Address = Reader.IsDBNull(5) ? null : Reader.GetString(5);
newemploy.Salary = Reader.GetDecimal(6);
list.Add(newemploy); //把一条条记录封装成对象，添加到list集合中
}
}
else
{
Console.WriteLine("没读到任何数据！！！");
}
}
}
}
//数据绑定只认属性，不认字段。内部通过反射来实现
DataGridView1.DataSource = list;
}
//插入一条新的记录
private void button1_Click(object sender, EventArgs e)
{
#region 版本一 显示插入数据成功
//bool flag;
////采集数据
//string name = txtname.Text.Trim();
//string gender = txtgender.Text.Trim();
//string age = txtage.Text.Trim();
//string school = txtschool.Text.Trim();
//string address = txtaddress.Text.Trim();
//string salary = txtsalary.Text.Trim();
//string constr = "data source=.;initial catalog=myfirstdatabase;integrated security=true";
//using (SqlConnection con = new SqlConnection(constr))
//{
// string sql = string.Format("insert into 员工表 values('{0}','{1}','{2}','{3}','{4}','{5}')", name, gender, age, school, address, salary);
// using (SqlCommand cmd = new SqlCommand(sql, con))
// {
// con.Open();
// int r = cmd.ExecuteNonQuery();
// if (r > 0)
// {
// flag = true;
// }
// else
// {
// flag = false;
// }
// }
//}
//if (flag)
//{
// MessageBox.Show("插入成功,编号为");//放到后面 不会阻塞进程，阻碍using 的进行
// LoadData(); //刷新，重新加载
//}
//else
//{
// MessageBox.Show("插入失败");
//}
#endregion
#region 版本二 显示插入成功并返回插入记录的编号
int id;
//采集数据
string name = txtname.Text.Trim();
string gender = txtgender.Text.Trim();
string age = txtage.Text.Trim();
string school = txtschool.Text.Trim();
string address = txtaddress.Text.Trim();
string salary = txtsalary.Text.Trim();
string constr = "data source=.;initial catalog=myfirstdatabase;integrated security=true";
using (SqlConnection con = new SqlConnection(constr))
{
string sql = string.Format("insert into 员工表 output inserted.员工编号 values('{0}','{1}','{2}','{3}','{4}','{5}')", name, gender, age, school, address, salary);
using (SqlCommand cmd = new SqlCommand(sql, con))
{
con.Open();
id = (int)cmd.ExecuteScalar();
}
}
MessageBox.Show(string.Format("插入成功，插入的编号是{0}", id));//放到后面 不会阻塞进程，阻碍using 的进行
LoadData(); //刷新，重新加载
#endregion
}
//删除数据
private void button3_Click(object sender, EventArgs e)
{
bool flag;
//采集用户输入
Employ model = new Employ();
model.ID = Convert.ToInt32(IDlabel.Text);
string constr = "data source=.;initial catalog=myfirstdatabase;integrated security=true";
using (SqlConnection con = new SqlConnection(constr))
{
string sql = string.Format("delete from 员工表 where 员工编号={0}", model.ID); //只有字符串类型两边需要加单引号
using (SqlCommand cmd = new SqlCommand(sql, con))
{
con.Open();
int r = cmd.ExecuteNonQuery();
if (r > 0)
{
flag = true;
}
else
{
flag = false;
}
}
}
if (flag)
{
MessageBox.Show("删除数据成功！");
LoadData();
}
else
{
MessageBox.Show("删除数据失败!");
}
}
//更新数据
private void button2_Click(object sender, EventArgs e)
{
bool flag;
//采集用户输入
Employ model = new Employ();
model.ID = Convert.ToInt32(IDlabel.Text);
model.Name = txtname2.Text;
model.Gender = txtgender2.Text;
model.Age = txtage2.Text.Trim().Length == 0 ? null : (int?)Convert.ToInt32(txtage2.Text.Trim());
model.School = txtschool2.Text.Trim().Length == 0 ? null : txtschool2.Text;
model.Address = txtaddress2.Text;
model.Salary = Convert.ToDecimal(txtsalary2.Text);
string constr = "data source=.;initial catalog=myfirstdatabase;integrated security=true";
using (SqlConnection con = new SqlConnection(constr))
{
string sql = string.Format("update 员工表 set 姓名='{0}',性别='{1}',年龄='{2}',毕业院校='{3}',家庭住址='{4}',工资='{5}'where 员工编号={6}", model.Name, model.Gender, model.Age, model.School, model.Address, model.Salary, model.ID);
using (SqlCommand cmd = new SqlCommand(sql, con))
{
con.Open();
int r = cmd.ExecuteNonQuery();
if (r > 0)
{
flag = true;
}
else
{
flag = false;
}
}
}
if (flag)
{
MessageBox.Show("更新记录成功！");
LoadData();
}
else
{
MessageBox.Show("更新记录失败!");
}
}
//行获取焦点事件
private void dataGridView1_RowEnter(object sender, DataGridViewCellEventArgs e)
{
//获取当前选中的行对象
DataGridViewRow currentRow = this.DataGridView1.Rows[e.RowIndex];
//获取当前行中绑定的employ数据对象，即每一行就是employ类的一个对象
Employ model = currentRow.DataBoundItem as Employ;
if (model != null)//转换成功
{
IDlabel.Text = model.ID.ToString();
txtname2.Text = model.Name;
txtgender2.Text = model.Gender;
txtage2.Text = model.Age.ToString();
txtschool2.Text = model.School;
txtaddress2.Text = model.Address;
txtsalary2.Text = model.Salary.ToString();
}
}
}
}