0.1创建数据库
0.2向数据库内添加数据
0.3创建一个辅助类
1 using System;
2 using System.Collections.Generic;
3 using System.Linq;
4 using System.Text;
5 using System.Threading.Tasks;
6
7 namespace Library
8 {
9 public class SqlTools
10 {
11 public static string str = "Data Source=.;Initial Catalog=Library;Uid=sa";
12 }
13 }
0.4创建主窗体如图
1 using System;
2 using System.Collections.Generic;
3 using System.ComponentModel;
4 using System.Data;
5 using System.Drawing;
6 using System.Linq;
7 using System.Text;
8 using System.Threading.Tasks;
9 using System.Windows.Forms;
10 using System.Data.SqlClient;
11
12 namespace Library
13 {
14 public partial class Homepage : Form
15 {
16 public Homepage()
17 {
18 InitializeComponent();
19 }
20 DataSet ds = new DataSet();//连接数据集
21 private void Homepage_Load(object sender, EventArgs e)
22 {
23 //主窗体
24 Show();//调用所有书的方法
25 }
26 #region 显示所有的书的方法
27 public void Show()
28 {
29 SqlConnection con = new SqlConnection(SqlTools.str);//创建 Connection对象
30 //SQL语句
31 string sql = "select * from Homepage";
32 //创建DataAdapter数据适配器
33 SqlDataAdapter da = new SqlDataAdapter(sql, con);
34 //填充数据
35 da.Fill(ds, "Homepage");
36 //数据源
37 dvgList.DataSource = ds.Tables["Homepage"];
38
39 }
40 #endregion
41
42 #region 查询判断的方法
43 public void Type()
44 {
45 DataView dv = new DataView(ds.Tables["Homepage"]);
46 if (!(txtBookName.Text.Trim().Equals("")) && (txtAuthor.Text.Trim().Equals("")))
47 {
48 dv.RowFilter = "BookName like‘%" + txtBookName.Text + "%‘";
49 dvgList.DataSource = dv;
50 }
51 else if ((txtBookName.Text.Trim().Equals("")) && (!txtAuthor.Text.Trim().Equals("")))
52 {
53 dv.RowFilter = "Author like‘%" + txtAuthor.Text + "%‘";
54 dvgList.DataSource = dv;
55 }
56 else
57 {
58 MessageBox.Show("没有您查询的书!");
59 }
60
61 }
62 #endregion
63
64 private void btnInquiry_Click(object sender, EventArgs e)
65 {
66 Type();//调用查询的方法
67 }
68
69 private void btnAdd_Click(object sender, EventArgs e)
70 {
71 //新增
72 FrmMain frm = new FrmMain ();
73 frm.stu = this;
74 frm.Show();
75 }
76
77 private void 删除ToolStripMenuItem_Click(object sender, EventArgs e)
78 {
79 //删除
80 #region 删除
81 if (dvgList.SelectedRows[0] != null)
82 {
83 string name = dvgList.SelectedRows[0].Cells["BookName"].Value.ToString();
84 SqlConnection con = new SqlConnection(SqlTools.str);
85 string sql = "Delete from Homepage where BookName=‘" + name + "‘";
86 SqlCommand cmd = new SqlCommand(sql, con);
87 try
88 {
89 con.Open();
90 int result = Convert.ToInt32(cmd.ExecuteScalar());
91 if (result > 0)
92 {
93 MessageBox.Show("删除成功!");
94 }
95 else
96 {
97 MessageBox.Show("删除失败!");
98 }
99
100 }
101 catch (Exception)
102 {
103 MessageBox.Show("网络连接异常!");
104 throw;
105 }
106 finally
107 {
108 con.Close();
109 }
110 }
111 #endregion
112 }
113 #region 刷新
114 public void input()
115 {
116 if (ds.Tables[0] != null)
117 {
118 ds.Tables["Homepage"].Clear();
119 }
120 Show();
121 }
122 #endregion
123
124 private void 修改ToolStripMenuItem_Click(object sender, EventArgs e)
125 {
126 FrmMain frm = new FrmMain();
127 frm.Text = "修改";
128 if (dvgList .SelectedRows [0]!=null )
129 {
130 string name = dvgList.SelectedRows[0].Cells["BookName"].Value.ToString();
131 frm.BookName = name;
132 }
133 frm.stu = this;
134 frm.Show();
135 }
136
137
138
139
140
141 }
142 }
0.5创建新增页面
1 using System;
2 using System.Collections.Generic;
3 using System.ComponentModel;
4 using System.Data;
5 using System.Drawing;
6 using System.Linq;
7 using System.Text;
8 using System.Threading.Tasks;
9 using System.Windows.Forms;
10 using System.Data.SqlClient;
11
12 namespace Library
13 {
14 public partial class FrmMain : Form
15 {
16 public FrmMain()
17 {
18 InitializeComponent();
19
20 }
21 public Homepage stu;
22 public string BookName;
23
24 private void btnCancel_Click(object sender, EventArgs e)
25 {
26
27
28 }
29 SqlConnection con = new SqlConnection(SqlTools .str );
30 private void btnConservation_Click(object sender, EventArgs e)
31 {
32 //保存
33 if (this.Text .Trim ().Equals ("新增"))
34 {
35 insert();
36 }
37 else if (this.Text .Trim ().Equals ("修改"))
38 {
39 update();
40 }
41 }
42 public void insert()
43 {
44 con.Open();
45 string sql = "insert into Homepage values(‘" + txtBookName.Text + "‘,‘" + txtAuthor.Text + "‘,‘" + txtPrice.Text + "‘,‘" + txtQuantity .Text+ "‘)";
46 SqlCommand cmd = new SqlCommand(sql, con);
47 try
48 {
49 int retult = Convert.ToInt32(cmd.ExecuteScalar());
50 if (retult >= 0)
51 {
52 MessageBox.Show("增加成功!");
53 }
54 else
55 {
56 MessageBox.Show("增加失败!");
57 }
58 }
59 catch (Exception)
60 {
61 MessageBox.Show("连接发生异常!");
62 throw;
63 }
64 finally
65 {
66 con.Close();
67 }
68 stu.input();
69 }
70 public void update()
71 {
72 con.Open();
73 string sql = "update Homepage set BookName=‘"+txtBookName.Text +"‘,‘"+txtAuthor.Text+"‘,‘"+txtPrice.Text+"‘,‘"+txtQuantity.Text+"‘where BookName=‘"+BookName +"‘";
74 SqlCommand cmd = new SqlCommand(sql,con );
75 try
76 {
77 int retult = Convert.ToInt32(cmd.ExecuteScalar());
78 if (retult >= 0)
79 {
80 MessageBox.Show("修改成功!");
81 }
82 else
83 {
84 MessageBox.Show("修改失败!");
85 }
86
87 }
88 catch (Exception)
89 {
90 MessageBox.Show("连接异常!");
91 throw;
92 }
93 finally
94 {
95 con.Close();
96 }
97 stu.input();
98 }
99
100 private void FrmMain_Load(object sender, EventArgs e)
101 {
102 //主窗体
103 txtBookName.Text = BookName;
104 }
105
106 }
107 }
0.6实现页面效果展示
时间： 2024-12-04 14:29:29