简单员工管理实例

数据库设计视图：

窗体界面设计：

实例展示：

全部代码（含注释，本例只是练手，有很多功能可以去扩展，比如说将数据导入、导出等）

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Data.SqlClient;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;

namespace StaffManagement
{
    public partial class Form1 : Form
    {
        //公有字段
        //public static string str = "";
        //此处定义静态数据库连接字符串，方便后面调用
        public static string strConn = "Server=(local);Database=db_Staff;Integrated Security=true";
        public Form1()
        {
            InitializeComponent();
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            //启动窗体时自动调用Showinf()方法
            Showinf();
        }
        //及时将数据返回到DataGridView窗口
        private void Showinf()
        {
            using (SqlConnection con = new SqlConnection(strConn))
            {
                DataTable dt = new DataTable();
                //使用SqlDataAdapter提交查询命令
                SqlDataAdapter da = new SqlDataAdapter("select * from 员工表 order by 员工编号", con);
                //将查询结果数据集提交到数据库中
                da.Fill(dt);
                //同时将数据在DataGridView中更新
                this.dataGridView1.DataSource = dt.DefaultView;
            }
        }
        /// <summary>
        /// 在控件中填充选中的DataGridView控件的数据
        /// </summary>
        //private void FillControls()
        //{
        //    try
        //    {
        //        this.txtNo.Text = this.dataGridView1[0, this.dataGridView1.CurrentCell.RowIndex].Value.ToString();
        //        this.txtName.Text = this.dataGridView1[1, this.dataGridView1.CurrentCell.RowIndex].Value.ToString();
        //        this.txtSalary.Text=this.dataGridView1[2,this.dataGridView1.CurrentCell.RowIndex].Value.ToString();
        //        this.txtEstimate.Text=this.dataGridView1[3,this.dataGridView1.CurrentCell.RowIndex].Value.ToString();
        //    }
        //    catch { }
        //}
        private void ClearTxt()
        {
            this.txtNo.Text = null;
            this.txtName.Text = null;
            this.txtSalary.Text = null;
            this.txtEstimate.Text = null;
        }
        /// <summary>
        /// 添加记录
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void btnAdd_Click(object sender, EventArgs e)
        {
            if (this.txtNo.Text == "")
            {
                MessageBox.Show("员工编号不能为空！");
                return;
            }
            if (this.txtName.Text == "")
            {
                MessageBox.Show("员工姓名不能为空！");
                return;
            }
            if (this.txtSalary.Text == "")
            {
                MessageBox.Show("基本工资不能为空！");
            }
            if (this.txtEstimate.Text == "")
            {
                MessageBox.Show("员工评价不能为空！");
            }
            using (SqlConnection con = new SqlConnection(strConn))
            {
                //首先判断连接是否存在
                if (con.State == ConnectionState.Closed)
                {
                    con.Open();
                }
                try
                {
                    StringBuilder strSQL = new StringBuilder();
                    strSQL.Append("insert into 员工表(员工编号,员工姓名,基本工资,工作评价)");
                    strSQL.Append("values('"+this.txtNo.Text.Trim().ToString()+"','"+
                        this.txtName.Text.Trim().ToString()+"',");
                    strSQL.Append("'" + Convert.ToSingle(this.txtSalary.Text.Trim().ToString())+"','"+
                        this.txtEstimate.Text.Trim().ToString()+"')");

                    using (SqlCommand cmd = new SqlCommand(strSQL.ToString(), con))
                    {
                        cmd.ExecuteNonQuery();
                        MessageBox.Show("信息增加成功!");
                    }
                    //清空插入的代码
                   // strSQL.Remove(0,strSQL.Length);
                }
                catch(Exception ex)
                {
                    MessageBox.Show("错误："+ex.Message,"错误提示",MessageBoxButtons.OKCancel,MessageBoxIcon.Error);
                }
                //不论是否发生异常都会执行finally中的语句，关闭连接。
                finally
                { 
                    if(con.State==ConnectionState.Open)
                    {
                        con.Close();
                        con.Dispose();
                    }
                    Showinf();
                    ClearTxt();
                }
            }
        }

        private void dataGridView1_CellContentClick(object sender, DataGridViewCellEventArgs e)
        {
            //str = this.dataGridView1.SelectedCells[0].Value.ToString();
        }
        /// <summary>
        /// 更新操作
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void btnUpdate_Click(object sender, EventArgs e)
        {
            using(SqlConnection con=new SqlConnection(strConn))
            {
                if (this.txtNo.Text.ToString() != null)
                {
                    string str_condition = "";
                    string str_cmdtxt = "";
                    //记录员工编号
                    str_condition = this.dataGridView1[0, this.dataGridView1.CurrentCell.RowIndex].Value.ToString();
                    str_cmdtxt = "update 员工表 set 员工姓名='" + this.txtName.Text.Trim() + "'," + "基本工资=" +
                       Convert.ToSingle(this.txtSalary.Text.Trim()) + "," + "工作评价='" + this.txtEstimate.Text.Trim() +
                       "'  where 员工编号='" + str_condition + "'";
                    try
                    {
                        if (con.State == ConnectionState.Closed)
                        {
                            con.Open();
                        }
                        using (SqlCommand cmd = new SqlCommand(str_cmdtxt, con))
                        {
                            cmd.ExecuteNonQuery();
                            MessageBox.Show("数据修改成功!");
                        }
                    }
                    catch (Exception ex)
                    {
                        MessageBox.Show("错误：" + ex.Message, "错误提示", MessageBoxButtons.OKCancel, MessageBoxIcon.Error);
                    }
                    finally
                    {
                        if (con.State == ConnectionState.Open)
                        {
                            con.Close();
                            con.Dispose();
                        }
                    }
                    Showinf();
                    ClearTxt();
                }
                else
                {
                    MessageBox.Show("员工编号为空啊！","提示对话框",MessageBoxButtons.YesNoCancel,MessageBoxIcon.Question);
                }
            }
        }
        /// <summary>
        /// 删除记录
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void btnDelete_Click(object sender, EventArgs e)
        {
            if (this.txtNo.Text == "")
            {
                MessageBox.Show("请输入员工编号！");
            }
            else
            {
                if (MessageBox.Show("你确定要删除吗？", "提示", MessageBoxButtons.YesNo, MessageBoxIcon.Question) == DialogResult.Yes)
                {
                    using (SqlConnection con = new SqlConnection(strConn))
                    {
                        con.Open();
                        string str_cmdtxt = "delete from 员工表 where 员工编号= '" + this.txtNo.Text.Trim() + "'";
                        SqlCommand cmd = new SqlCommand(str_cmdtxt, con);
                        cmd.ExecuteNonQuery();
                        con.Close();
                        Showinf();
                        MessageBox.Show("删除成功！");
                    }
                    ClearTxt();
                }
                else
                {
                    ClearTxt();
                }
            }
        }
        /// <summary>
        /// 清空文本框
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void btnClear_Click(object sender, EventArgs e)
        {
            ClearTxt();
        }
        /// <summary>
        /// 退出操作
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void btnExit_Click(object sender, EventArgs e)
        {
            Application.Exit();
        }

        private void btnFind_Click(object sender, EventArgs e)
        {
            //调用清空文本的方法
           // ClearTxt();
            using(SqlConnection con=new SqlConnection(strConn))
            {
                con.Open();
                string str_cmdtxt = "select * from 员工表 where 员工编号='" + this.txtNo.Text.Trim() + "'";
                SqlCommand cmd = new SqlCommand(str_cmdtxt,con);
                SqlDataReader dr = cmd.ExecuteReader();
                while(dr.Read())
                {
                    this.txtName.Text = dr["员工姓名"].ToString();
                    this.txtSalary.Text = dr["基本工资"].ToString();
                    this.txtEstimate.Text = dr["工作评价"].ToString();
                    //txtName.Text = dataGridView1.Rows[dataGridView1.CurrentRow.Index].Cells[1].Value.ToString();
                    //txtSalary.Text = dataGridView1.Rows[dataGridView1.CurrentRow.Index].Cells[2].Value.ToString();
                    //txtEstimate.Text = dataGridView1.Rows[dataGridView1.CurrentRow.Index].Cells[3].Value.ToString();
                //txtNo.Text = dataGridView1.Rows[dataGridView1.CurrentRow.Index].Cells[0].Value.ToString();
                }
                if (con.State ==ConnectionState.Open)
                {
                    con.Close();
                    con.Dispose();
                }
            }

        }
    }
}