C#------CURD(2)

using MySql.Data.MySqlClient;
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;

namespace CURD
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}

private void LoadData()
{
DataTable tab = MySqlHelper.ExecuteQuery("select id,name,age,if(gender,'男','女') gender from t_persons");
gridePersons.DataSource = tab;
}

private void Form1_Load(object sender, EventArgs e)
{
//禁止自动生成列
gridePersons.AutoGenerateColumns = false;

//查询数据
LoadData();
}

private void gridePersons_CellContentClick(object sender, DataGridViewCellEventArgs e)
{
DataTable tab = (DataTable)gridePersons.DataSource;
//得到选中的行数
DataRow row = tab.Rows[e.RowIndex];
//得到当前选中行的ID号
int id = (int)row["id"];

//点击的是哪一列
if (e.ColumnIndex == 0)//编辑
{
PersonEdit form = new PersonEdit();
form.Action = "Edit";
form.EditingId = id;
form.ShowDialog();
LoadData();
}
else if (e.ColumnIndex == 1)//删除
{

//提示用户是否要删除
if (MessageBox.Show("你真的要删除吗？", "提示",
MessageBoxButtons.YesNo, MessageBoxIcon.Question) != DialogResult.Yes)
{
return;
}

//根据ID删除
MySqlHelper.ExecuteNonQuery("DELETE FROM t_persons WHERE id = @id",
new MySqlParameter { ParameterName = "@id", Value = id });

//刷新数据
LoadData();
}
}

private void toolStripButton1_Click(object sender, EventArgs e)
{
//新增
PersonEdit form = new PersonEdit();
form.Action = "AddNew";
form.ShowDialog();
LoadData();//新增完成，刷新界面
}
}
}

using MySql.Data.MySqlClient;
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;

namespace CURD
{
public partial class PersonEdit : Form
{

//新增数据传递 Action="AddNew"
public string Action { get; set; }
//编辑数据传递 Action = "Edit" EditingId=5
public int EditingId { get; set; }

public PersonEdit()
{
InitializeComponent();
}

private void personEdit_Load(object sender, EventArgs e)
{
if (Action == "Edit")//如果是编辑，则先加载旧的数据
{
DataTable table = MySqlHelper.ExecuteQuery("select * from t_persons where id=@id",
new MySqlParameter { ParameterName = "@id", Value = EditingId });

if (table.Rows.Count <= 0)
{
MessageBox.Show("找不到ID为" + EditingId + "的数据");
return;
}
//取得查询出来的数据
DataRow row = table.Rows[0];
txtName.Text = (string)row["name"];
txtAge.Text = (string)row["age"];
ulong gender = (ulong)row["gender"];
//判断是男还是女，男为第一列0 女为第二列1
txtGender.SelectedIndex = (gender == 1 ? 0 : 1);
}
}

//保存按钮
private void tijiao_Click(object sender, EventArgs e)
{
if (Action == "AddNew")//新增
{
string name = txtName.Text;
int age = Convert.ToInt32( txtAge.Text);
bool gender = (txtGender.SelectedIndex == 0);//选中第一行
MySqlHelper.ExecuteNonQuery("insert into t_persons(name,age,gender) values(@name,@age,@gender)",
new MySqlParameter { ParameterName="@name",Value=name},
new MySqlParameter { ParameterName = "@age", Value = age },
new MySqlParameter { ParameterName = "@gender", Value = gender });

Close();//关闭对话框
}
else if (Action == "Edit")//修改
{
string name = txtName.Text;
int age = Convert.ToInt32(txtAge.Text);
bool gender = (txtGender.SelectedIndex == 0);//选中第一行
MySqlHelper.ExecuteNonQuery("update t_persons set name=@name,age=@age,gender=@gender where id=@id",
new MySqlParameter { ParameterName = "@name", Value = name },
new MySqlParameter { ParameterName = "@age", Value = age },
new MySqlParameter { ParameterName = "@gender", Value = gender },
new MySqlParameter { ParameterName = "@id", Value = EditingId });

Close();
}
else
{
throw new Exception("Action错误");
}
}
}
}