C#winform实现增删改查
上文介绍了pb实现增删改查，短短几十行代码就ok了，c#的winform相对麻烦一点，因为没有datawindow神器呀。
数据库还是sqlserver，表的名字依然是table_test，字段dbid键值，xm1，xm2,xm3字符型。
首先使用vs建立一个windows窗口应用程序test
第二步，在form1上摆放控件
和上文的pb的程序一样排版就可以，拖放一个datagridview，四个button，四个label，三个text，两个radiobutton还有两个groupbox。
第三步，编写一个处理数据库的类db.cs
using System;
using System.Data;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Data.SqlClient;
namespace test
{
class db
{
public static string connectionstring = "server=localhost;database=db;uid=sa;pwd=password";
public static SqlConnection OpenDB()
{
try
{
SqlConnection oConn = new SqlConnection(connectionstring);
oConn.Open();
return oConn;
}
catch
{
throw;
}
}
public static void CloseDB(SqlConnection oConn)
{
try
{
oConn.Close();
}
catch
{
throw;
}
}
public static DataSet Execute(string strCommandString)
{
try
{
SqlConnection oConn = OpenDB();
DataSet oDataSet = new DataSet();
SqlDataAdapter oDataAdapter = new SqlDataAdapter(strCommandString, oConn);
oDataAdapter.Fill(oDataSet);
CloseDB(oConn);
return oDataSet;
}
catch
{
throw;
}
}
public static int ExecuteNonQuery(string strCommandString)
{
int li_count = 0;
SqlConnection oConn = null;
SqlCommand oComm = null;
try
{
oConn = new SqlConnection(connectionstring);
oComm = new SqlCommand();
oConn.Open();
oComm.Connection = oConn;
oComm.CommandText = strCommandString;
li_count = oComm.ExecuteNonQuery();
return li_count;
}
catch
{
return 0;
}
finally
{
if (oConn != null) oConn.Close();
}
}
public static int ExecuteReid(string strCommandString)
{
int li_count = 0;
SqlConnection oConn = null;
SqlCommand oComm = null;
try
{
oConn = new SqlConnection(connectionstring);
oComm = new SqlCommand();
oConn.Open();
oComm.Connection = oConn;
oComm.CommandText = strCommandString;
li_count = Convert.ToInt32(oComm.ExecuteScalar().ToString());
return li_count;
}
catch
{
return 0;
}
finally
{
if (oConn != null) oConn.Close();
}
}
}
}
第四步：编写增删改查的程序
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
namespace test
{
public partial class Form1 : Form
{
private string ls_dbid = "";
public Form1()
{
InitializeComponent();
get_db1("");
}
private int get_db1(string as_where)
{
string ls_sql = "select xm1,xm2,xm3,dbid from table_test " + as_where + " order by dbid";
DataSet ds = new DataSet();
try
{
ds = db.Execute(ls_sql);
}
catch
{
//数据库出错，相应的sql为getsql()
MessageBox.Show("error of connect database");
}
dgv1.DataSource = ds.Tables[0].DefaultView;
dgv1.Columns[0].HeaderText = "姓名";
dgv1.Columns[1].HeaderText = "性别";
dgv1.Columns[2].HeaderText = "电话";
dgv1.Columns[0].Width = 200;
dgv1.Columns[1].Width = 100;
dgv1.Columns[2].Width = 400;
dgv1.Columns[3].Visible = false;
return ds.Tables[0].Rows.Count;
}
private void dgv1_MouseClick(object sender, MouseEventArgs e)
{
txt_xm1.Text = dgv1.CurrentRow.Cells[0].Value.ToString();
string ls_xm2 = dgv1.CurrentRow.Cells[1].Value.ToString();
if (ls_xm2.Equals("男"))
{
rb_1.Checked = true;
}
else
{
rb_2.Checked = true;
}
txt_xm3.Text = dgv1.CurrentRow.Cells[2].Value.ToString();
ls_dbid = dgv1.CurrentRow.Cells[3].Value.ToString();
}
private void dgv1_RowPostPaint(object sender, DataGridViewRowPostPaintEventArgs e)
{
DataGridView dgv = sender as DataGridView;
Rectangle rectangle = new Rectangle(e.RowBounds.Location.X,
e.RowBounds.Location.Y,
dgv.RowHeadersWidth - 4,
e.RowBounds.Height);
TextRenderer.DrawText(e.Graphics, (e.RowIndex + 1).ToString(),
dgv.RowHeadersDefaultCellStyle.Font,
rectangle,
dgv.RowHeadersDefaultCellStyle.ForeColor,
TextFormatFlags.VerticalCenter | TextFormatFlags.Right);
}
private void bt_add_Click(object sender, EventArgs e)
{
txt_xm1.Text = "";
rb_1.Checked = true;
txt_xm3.Text = "";
ls_dbid = "";
}
private void bt_save_Click(object sender, EventArgs e)
{
// *** 将信息更新到数据库
string ls_xm2 = "";
if (rb_1.Checked)
{
ls_xm2 = "男";
}
else
{
ls_xm2 = "女";
}
if (ls_dbid == "")
{
string ls_sql = "INSERT INTO table_test ( xm1,xm2,xm3 ) VALUES ( @@xm1, @@xm2, @@xm3 ); SELECT dbid FROM table_test WHERE (dbid = @@IDENTITY)";
ls_sql = ls_sql.Replace("@@xm1", "'" + txt_xm1.Text.ToString() + "'");
ls_sql = ls_sql.Replace("@@xm2", "'" + ls_xm2 + "'");
ls_sql = ls_sql.Replace("@@xm3", "'" + txt_xm3.Text.ToString() + "'");
int li_ret1 = db.ExecuteReid(ls_sql);
if (li_ret1 > 0)
{
ls_dbid = li_ret1.ToString();
}
else
{
MessageBox.Show("增加失败", "信息");
return;
}
}
else
{
string ls_sql = "update table_test set xm1=@@xm1,xm2=@@xm2,xm3=@@xm3 where dbid = " + ls_dbid;
ls_sql = ls_sql.Replace("@@xm1", "'" + txt_xm1.Text.ToString() + "'");
ls_sql = ls_sql.Replace("@@xm2", "'" + ls_xm2 + "'");
ls_sql = ls_sql.Replace("@@xm3", "'" + txt_xm3.Text.ToString() + "'");
db.ExecuteNonQuery(ls_sql);
}
get_db1("");
MessageBox.Show("保存成功!", "信息");
}
private void bt_del_Click(object sender, EventArgs e)
{
if (ls_dbid == "")
{
MessageBox.Show("请选择要删除的记录");
}
else
{
string ls_sql = "delete from table_test where dbid=" + ls_dbid ;
db.ExecuteNonQuery(ls_sql);
get_db1("");
MessageBox.Show("删除成功!", "信息");
}
}
private void bt_exit_Click(object sender, EventArgs e)
{
Close();
}
private void txt_cx_TextChanged(object sender, EventArgs e)
{
string ls_where = "";
if (this.Text.Equals(""))
{
ls_where = "";
}
else
{
ls_where = " where (xm1 like '%" + txt_cx.Text.ToString() + "%') or (xm2 like '%" + txt_cx.Text.ToString() + "%') or (xm3 like '%" + txt_cx.Text.ToString() + "%')";
}
get_db1(ls_where);
}
}
}
总结：
微软的工具，在windows平台上开发程序还是很高效的，短短几百行代码就把问题全部搞定了。