1.Main.axml
1 <?xml version="1.0" encoding="utf-8"?> 2 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" 3 android:orientation="vertical" 4 android:layout_width="fill_parent" 5 android:layout_height="fill_parent"> 6 <TableLayout 7 android:minWidth="25px" 8 android:minHeight="25px" 9 android:layout_width="fill_parent" 10 android:layout_height="wrap_content" 11 android:layout_gravity="center_horizontal" 12 android:id="@+id/tableLayout1"> 13 <TableRow 14 android:background="@android:drawable/bottom_bar" 15 android:id="@+id/tableRow2" 16 android:layout_height="40dp"> 17 <TextView 18 android:text="姓名" 19 android:textAppearance="?android:attr/textAppearanceSmall" 20 android:layout_width="34.0dp" 21 android:layout_height="23.3dp" 22 android:id="@+id/tvName" 23 android:layout_marginRight="0.0dp" 24 android:layout_column="0" 25 android:layout_marginTop="20dp" 26 android:textColor="#fff" /> 27 <EditText 28 android:inputType="textPersonName" 29 android:layout_width="80px" 30 android:layout_height="wrap_content" 31 android:id="@+id/txtName" 32 android:layout_gravity="center_vertical" 33 android:layout_column="1" /> 34 <TextView 35 android:text="年龄" 36 android:textAppearance="?android:attr/textAppearanceSmall" 37 android:layout_width="30.7dp" 38 android:layout_height="24.0dp" 39 android:id="@+id/tvAge" 40 android:layout_marginTop="20dp" 41 android:textColor="#ffffff" /> 42 <EditText 43 android:inputType="number" 44 android:layout_width="50dp" 45 android:layout_height="wrap_content" 46 android:id="@+id/txtAge" 47 android:layout_gravity="center_vertical" /> 48 <TextView 49 android:text="国家" 50 android:textAppearance="?android:attr/textAppearanceSmall" 51 android:layout_width="33.3dp" 52 android:layout_height="22.7dp" 53 android:id="@+id/tvCountry" 54 android:layout_marginRight="0.0dp" 55 android:layout_marginTop="20dp" 56 android:textColor="#fff" /> 57 <EditText 58 android:layout_width="100dp" 59 android:layout_height="wrap_content" 60 android:id="@+id/txtCountry" 61 android:layout_gravity="center_vertical" 62 android:layout_marginRight="0dp" /> 63 </TableRow> 64 <TableRow 65 android:id="@+id/tableRow3"> 66 <TextView 67 android:layout_width="fill_parent" 68 android:layout_height="wrap_content" 69 android:id="@+id/tvMsg" 70 android:layout_column="1" /> 71 </TableRow> 72 </TableLayout> 73 <LinearLayout 74 android:orientation="horizontal" 75 android:layout_width="fill_parent" 76 android:layout_height="40dp" 77 android:paddingLeft="10dp" 78 android:id="@+id/llButtons" 79 android:background="@android:drawable/bottom_bar" 80 android:layout_marginBottom="0dp"> 81 <ImageButton 82 android:src="@drawable/add" 83 android:layout_width="75px" 84 android:paddingLeft="0dp" 85 android:layout_height="wrap_content" 86 android:background="@android:color/transparent" 87 android:id="@+id/imgAdd" 88 android:layout_marginTop="0.0dp" 89 android:paddingTop="0dp" 90 android:maxHeight="32px" 91 android:maxWidth="32px" 92 android:minHeight="32px" 93 android:minWidth="32px" /> 94 <ImageButton 95 android:src="@drawable/edit" 96 android:layout_width="75px" 97 android:paddingLeft="0dp" 98 android:layout_height="wrap_content" 99 android:background="@android:color/transparent" 100 android:id="@+id/imgEdit" 101 android:paddingTop="0dp" /> 102 <ImageButton 103 android:src="@drawable/delete" 104 android:layout_width="75px" 105 android:paddingLeft="0dp" 106 android:layout_height="wrap_content" 107 android:background="@android:color/transparent" 108 android:id="@+id/imgDelete" 109 android:paddingTop="0dp" /> 110 <ImageButton 111 android:src="@drawable/find" 112 android:layout_width="75px" 113 android:paddingLeft="0dp" 114 android:layout_height="wrap_content" 115 android:background="@android:color/transparent" 116 android:id="@+id/imgFind" 117 android:paddingTop="0dp" /> 118 </LinearLayout> 119 <LinearLayout 120 android:orientation="horizontal" 121 android:minWidth="25px" 122 android:minHeight="25px" 123 android:layout_width="fill_parent" 124 android:layout_height="wrap_content" 125 android:paddingLeft="10dp" 126 android:id="@+id/llHeader"> 127 <TextView 128 android:text="编号" 129 android:layout_width="66.7dp" 130 android:layout_height="wrap_content" 131 android:id="@+id/tvIdShowR" 132 android:textColor="@android:color/white" /> 133 <TextView 134 android:text="姓名" 135 android:layout_width="72.0dp" 136 android:layout_height="wrap_content" 137 android:textColor="@android:color/white" 138 android:id="@+id/tvPersonShowR" 139 android:layout_marginLeft="20dp" 140 android:layout_marginRight="0.0dp" /> 141 <TextView 142 android:text="年龄" 143 android:layout_width="58.7dp" 144 android:layout_height="wrap_content" 145 android:textColor="@android:color/white" 146 android:id="@+id/tvAgeShowR" /> 147 <TextView 148 android:text="国家" 149 android:layout_width="65.3dp" 150 android:layout_height="wrap_content" 151 android:textColor="@android:color/white" 152 android:id="@+id/tvCountryShowR" 153 android:layout_marginLeft="20dp" /> 154 </LinearLayout> 155 <ListView 156 android:minWidth="25px" 157 android:minHeight="25px" 158 android:layout_width="fill_parent" 159 android:layout_height="wrap_content" 160 android:paddingLeft="10dp" 161 android:id="@+id/lvTemp" /> 162 </LinearLayout>
2.Activity1.cs
1 using System;
2 using System.Collections.Generic;
3 using Android.App;
4 using Android.Content;
5 using Android.Runtime;
6 using Android.Views;
7 using Android.Widget;
8 using Android.OS;
9
10 namespace MyDatabaseDemo
11 {
12 /// <summary>
13 /// Main Activity1 to start applicaton.
14 /// </summary>
15 [Activity (Label = "My Database Demo", MainLauncher = true)]
16 public class Activity1 : Activity
17 {
18 /// <summary>
19 /// The mdtemp is object of MyDatabase class.
20 /// </summary>
21 MyDatabase mdTemp;
22 /// <summary>
23 /// The txtName, txtAge, txtCountry are object of EditText.
24 /// </summary>
25 EditText txtName, txtAge, txtCountry;
26 /// <summary>
27 /// The tvMsg is object of TextView.
28 /// </summary>
29 TextView tvMsg;
30 /// <summary>
31 /// The imgAdd, imgEdit, imgDelete, imgFind are object of ImageButton
32 /// </summary>
33 ImageButton imgAdd, imgEdit, imgDelete, imgFind;
34 /// <summary>
35 /// Raises the create event for application.
36 /// </summary>
37 /// <param name=‘bundle‘>
38 /// Bundle.
39 /// </param>
40 protected override void OnCreate (Bundle bundle)
41 {
42 base.OnCreate (bundle);
43
44 // Set our view from the "main" layout resource
45 SetContentView (Resource.Layout.Main);
46
47 // Get our button from the layout resource,
48 // and attach an event to it
49
50 // initialization of database class object.
51 mdTemp = new MyDatabase ("person_db");
52 // get ImageButton object instance from resource.
53 imgAdd = FindViewById<ImageButton> (Resource.Id.imgAdd);
54 imgEdit = FindViewById<ImageButton> (Resource.Id.imgEdit);
55 imgDelete = FindViewById<ImageButton> (Resource.Id.imgDelete);
56 imgFind = FindViewById<ImageButton> (Resource.Id.imgFind);
57 // set images on image button from resource.
58 imgAdd.SetImageResource (Resource.Drawable.add);
59 imgEdit.SetImageResource (Resource.Drawable.save);
60 imgDelete.SetImageResource (Resource.Drawable.delete);
61 imgFind.SetImageResource (Resource.Drawable.find);
62 // get EditText object instance from resource.
63 txtName = FindViewById<EditText> (Resource.Id.txtName);
64 txtAge = FindViewById<EditText> (Resource.Id.txtAge);
65 txtCountry = FindViewById<EditText> (Resource.Id.txtCountry);
66 tvMsg = FindViewById<TextView> (Resource.Id.tvMsg);
67
68 tvMsg.Text = mdTemp.Message;
69
70 // 添加 ImageButton click event for imgAdd, imgEdit, imgDelete, imgFind.
71 imgAdd.Click += delegate {
72 //database call add record function AddRecord().
73 mdTemp.AddRecord (txtName.Text, int.Parse (txtAge.Text), txtCountry.Text);
74 tvMsg.Text = mdTemp.Message;
75 txtName.Text = txtAge.Text = txtCountry.Text = "";
76 };
77 //编辑
78 imgEdit.Click += delegate {
79 int iId = -1;
80 int.TryParse (tvMsg.Text, out iId);
81 //database call update record function UpdateRecord().
82 mdTemp.UpdateRecord (iId, txtName.Text, int.Parse (txtAge.Text), txtCountry.Text);
83 tvMsg.Text = mdTemp.Message;
84 txtName.Text = txtAge.Text = txtCountry.Text = "";
85 };
86 //删除
87 imgDelete.Click += delegate {
88 int iId = -1;
89 int.TryParse (tvMsg.Text, out iId);
90 //database call delete record function DeleteRecord().
91 mdTemp.DeleteRecord (iId);
92 tvMsg.Text = mdTemp.Message;
93 txtName.Text = txtAge.Text = txtCountry.Text = "";
94 };
95 //查找
96 imgFind.Click += delegate {
97
98 //database call search record function GetCursorView().
99 string sColumnName = "";
100 if (txtName.Text.Trim () != "") {
101 sColumnName = "by Name";
102 GetCursorView (sColumnName, txtName.Text.Trim ());
103 } else
104 if (txtAge.Text.Trim () != "") {
105 sColumnName = "by Age";
106 GetCursorView (sColumnName, txtAge.Text.Trim ());
107 } else
108 if (txtCountry.Text.Trim () != "") {
109 sColumnName = "by Country";
110 GetCursorView (sColumnName, txtCountry.Text.Trim ());
111 } else {
112 GetCursorView ();
113 sColumnName = "All";
114 }
115 tvMsg.Text = "Search " + sColumnName + ".";
116 };
117
118 // get ListView object instance from resource and add ItemClick, EventHandler.
119 ListView lvTemp = FindViewById<ListView> (Resource.Id.lvTemp);
120 lvTemp.ItemClick += new EventHandler<AdapterView.ItemClickEventArgs> (ListView_ItemClick);
121
122
123 }
124 /// <summary>
125 /// Lists the view_ item click.
126 /// </summary>
127 /// <param name=‘sender‘>
128 /// object sender.
129 /// </param>
130 /// <param name=‘e‘>
131 /// ItemClickEventArgs e.
132 /// </param>
133 void ListView_ItemClick (object sender, AdapterView.ItemClickEventArgs e)
134 {
135 // get TextView object instance from resource layout record_view.axml.
136 TextView tvIdShow = e.View.FindViewById<TextView> (Resource.Id.tvIdShow);
137 TextView tvPersonShow = e.View.FindViewById<TextView> (Resource.Id.tvPersonShow);
138 TextView tvAgeShow = e.View.FindViewById<TextView> (Resource.Id.tvAgeShow);
139 TextView tvCountryShow = e.View.FindViewById<TextView> (Resource.Id.tvCountryShow);
140 // read value and wirte in EditText object.
141 txtName.Text = tvPersonShow.Text;
142 txtAge.Text = tvAgeShow.Text;
143 txtCountry.Text = tvCountryShow.Text;
144 //record id is write in TextView object to update or delete record.
145 tvMsg.Text = tvIdShow.Text;
146 }
147 /// <summary>
148 /// Gets the cursor view to show all record.
149 /// </summary>
150 protected void GetCursorView ()
151 {
152 Android.Database.ICursor icTemp = mdTemp.GetRecordCursor ();
153 if (icTemp != null) {
154 icTemp.MoveToFirst ();
155 ListView lvTemp = FindViewById<ListView> (Resource.Id.lvTemp);
156 string[] from = new string[] {"_id","Name","Age","Country" };
157 int[] to = new int[] {
158 Resource.Id.tvIdShow,
159 Resource.Id.tvPersonShow,
160 Resource.Id.tvAgeShow,
161 Resource.Id.tvCountryShow
162 };
163 // creating a SimpleCursorAdapter to fill ListView object.
164 SimpleCursorAdapter scaTemp = new SimpleCursorAdapter (this, Resource.Layout.record_view, icTemp, from, to);
165 lvTemp.Adapter = scaTemp;
166 } else {
167 tvMsg.Text = mdTemp.Message;
168 }
169 }
170 /// <summary>
171 /// Gets the cursor view.
172 /// </summary>
173 /// <param name=‘sColumn‘>
174 /// column filed of MyTable is Name,Age,Country.
175 /// </param>
176 /// <param name=‘sValue‘>
177 /// Value as user input.
178 /// </param>
179 protected void GetCursorView (string sColumn, string sValue)
180 {
181 Android.Database.ICursor icTemp = mdTemp.GetRecordCursor (sColumn, sValue);
182 if (icTemp != null) {
183 icTemp.MoveToFirst ();
184 ListView lvTemp = FindViewById<ListView> (Resource.Id.lvTemp);
185 string[] from = new string[] {"_id","Name","Age","Country" };
186 int[] to = new int[] {
187 Resource.Id.tvIdShow,
188 Resource.Id.tvPersonShow,
189 Resource.Id.tvAgeShow,
190 Resource.Id.tvCountryShow
191 };
192 // creating a SimpleCursorAdapter to fill ListView object.
193 SimpleCursorAdapter scaTemp = new SimpleCursorAdapter (this, Resource.Layout.record_view, icTemp, from, to);
194 lvTemp.Adapter = scaTemp;
195 } else {
196 tvMsg.Text = mdTemp.Message;
197 }
198 }
199 }
200 }
3.MyDatabase.cs
1 using System;
2 using System.Collections.Generic;
3 using System.Linq;
4 using System.Text;
5
6 using Android.App;
7 using Android.Content;
8 using Android.OS;
9 using Android.Runtime;
10 using Android.Views;
11 using Android.Widget;
12 using Android.Database.Sqlite;
13 using System.IO;
14
15 namespace MyDatabaseDemo
16 {
17 public class MyDatabase
18 {
19 /// <summary>
20 /// SQLiteDatabase object sqldTemp to handle SQLiteDatabase.
21 /// </summary>
22 private SQLiteDatabase sqldTemp;
23 /// <summary>
24 /// The sSQLquery for query handling.
25 /// </summary>
26 private string sSQLQuery;
27 /// <summary>
28 /// The sMessage to hold message.
29 /// </summary>
30 private string sMessage;
31 /// <summary>
32 /// The bDBIsAvailable for database is available or not.
33 /// </summary>
34 private bool bDBIsAvailable;
35 /// <summary>
36 /// Initializes a new instance of the <see cref="MyDatabaseDemo.MyDatabase"/> class.
37 /// </summary>
38 public MyDatabase ()
39 {
40 sMessage = "";
41 bDBIsAvailable = false;
42 }
43 /// <summary>
44 /// Initializes a new instance of the <see cref="MyDatabaseDemo.MyDatabase"/> class.
45 /// </summary>
46 /// <param name=‘sDatabaseName‘>
47 /// Pass your database name.
48 /// </param>
49 public MyDatabase (string sDatabaseName)
50 {
51 try {
52 sMessage = "";
53 bDBIsAvailable = false;
54 CreateDatabase (sDatabaseName);
55 } catch (SQLiteException ex) {
56 sMessage = ex.Message;
57 }
58 }
59 /// <summary>
60 /// Gets or sets a value indicating whether this <see cref="MyDatabaseDemo.MyDatabase"/> database available.
61 /// </summary>
62 /// <value>
63 /// <c>true</c> if database available; otherwise, <c>false</c>.
64 /// </value>
65 public bool DatabaseAvailable {
66 get{ return bDBIsAvailable;}
67 set{ bDBIsAvailable = value;}
68 }
69 /// <summary>
70 /// 消息
71 /// </summary>
72 /// <value>
73 /// The message.
74 /// </value>
75 public string Message {
76 get{ return sMessage;}
77 set{ sMessage = value;}
78 }
79 /// <summary>
80 /// 创建数据库
81 /// </summary>
82 /// <param name=‘sDatabaseName‘>
83 /// Pass database name.
84 /// </param>
85 public void CreateDatabase (string sDatabaseName)
86 {
87 try {
88 sMessage = "";
89 string sLocation = System.Environment.GetFolderPath (System.Environment.SpecialFolder.Personal);
90 string sDB = Path.Combine (sLocation, sDatabaseName);
91 bool bIsExists = File.Exists (sDB);
92 if (!bIsExists) {
93 sqldTemp = SQLiteDatabase.OpenOrCreateDatabase (sDB, null);
94 sSQLQuery = "CREATE TABLE IF NOT EXISTS " +
95 "MyTable " +
96 "(_id INTEGER PRIMARY KEY AUTOINCREMENT,Name VARCHAR,Age INT,Country VARCHAR);";
97 sqldTemp.ExecSQL (sSQLQuery);
98 sMessage = "New database is created.";
99 } else {
100 sqldTemp = SQLiteDatabase.OpenDatabase (sDB, null, DatabaseOpenFlags.OpenReadwrite);
101 sMessage = "Database is opened.";
102 }
103 bDBIsAvailable = true;
104 } catch (SQLiteException ex) {
105 sMessage = ex.Message;
106 }
107 }
108 /// <summary>
109 /// 添加记录
110 /// </summary>
111 /// <param name=‘sName‘>
112 /// Pass name.
113 /// </param>
114 /// <param name=‘iAge‘>
115 /// Pass age.
116 /// </param>
117 /// <param name=‘sCountry‘>
118 /// Pass country.
119 /// </param>
120 public void AddRecord (string sName, int iAge, string sCountry)
121 {
122 try {
123 sSQLQuery = "INSERT INTO " +
124 "MyTable " +
125 "(Name,Age,Country)" +
126 "VALUES(‘" + sName + "‘," + iAge + ",‘" + sCountry + "‘);";
127 sqldTemp.ExecSQL (sSQLQuery);
128 sMessage = "Record is saved.";
129 } catch (SQLiteException ex) {
130 sMessage = ex.Message;
131 }
132 }
133 /// <summary>
134 /// 更新记录
135 /// </summary>
136 /// <param name=‘iId‘>
137 /// Pass record ID.
138 /// </param>
139 /// <param name=‘sName‘>
140 /// Pass name.
141 /// </param>
142 /// <param name=‘iAge‘>
143 /// Pass age.
144 /// </param>
145 /// <param name=‘sCountry‘>
146 /// Pass country.
147 /// </param>
148 public void UpdateRecord (int iId, string sName, int iAge, string sCountry)
149 {
150 try {
151 sSQLQuery = "UPDATE MyTable " +
152 "SET Name=‘" + sName + "‘,Age=‘" + iAge + "‘,Country=‘" + sCountry + "‘ " +
153 "WHERE _id=‘" + iId + "‘;";
154 sqldTemp.ExecSQL (sSQLQuery);
155 sMessage = "Record is updated: " + iId;
156 } catch (SQLiteException ex) {
157 sMessage = ex.Message;
158 }
159 }
160 /// <summary>
161 /// 删除记录
162 /// </summary>
163 /// <param name=‘iId‘>
164 /// Pass ID.
165 /// </param>
166 public void DeleteRecord (int iId)
167 {
168 try {
169 sSQLQuery = "DELETE FROM MyTable " +
170 "WHERE _id=‘" + iId + "‘;";
171 sqldTemp.ExecSQL (sSQLQuery);
172 sMessage = "Record is deleted: " + iId;
173 } catch (SQLiteException ex) {
174 sMessage = ex.Message;
175 }
176 }
177 /// <summary>
178 /// 获取当前记录游标
179 /// </summary>
180 /// <returns>
181 /// The record cursor.
182 /// </returns>
183 public Android.Database.ICursor GetRecordCursor ()
184 {
185 Android.Database.ICursor icTemp = null;
186 try {
187 sSQLQuery = "SELECT * FROM MyTable;";
188 icTemp = sqldTemp.RawQuery (sSQLQuery, null);
189 if (!(icTemp != null)) {
190 sMessage = "Record not found.";
191 }
192 } catch (SQLiteException ex) {
193 sMessage = ex.Message;
194 }
195 return icTemp;
196 }
197 /// <summary>
198 /// 获取符合检索条件的记录游标
199 /// </summary>
200 /// <returns>
201 /// The record cursor.
202 /// </returns>
203 /// <param name=‘sColumn‘>
204 /// column filed of MyTable is Name,Age,Country.
205 /// </param>
206 /// <param name=‘sValue‘>
207 /// Value as user input.
208 /// </param>
209 public Android.Database.ICursor GetRecordCursor (string sColumn, string sValue)
210 {
211 Android.Database.ICursor icTemp = null;
212 try {
213 sSQLQuery = "SELECT * FROM MyTable WHERE " + sColumn + " LIKE ‘" + sValue + "%‘;";
214 icTemp = sqldTemp.RawQuery (sSQLQuery, null);
215 if (!(icTemp != null)) {
216 sMessage = "Record not found.";
217 }
218 } catch (SQLiteException ex) {
219 sMessage = ex.Message;
220 }
221 return icTemp;
222 }
223 /// <summary>
224 /// 释放非托管资源并执行其他清理操作之前被垃圾回收
225 /// <see cref="MyDatabaseDemo.MyDatabase"/>
226 /// </summary>
227 ~MyDatabase ()
228 {
229 try {
230 sMessage = "";
231 bDBIsAvailable = false;
232 sqldTemp.Close ();
233 } catch (SQLiteException ex) {
234 sMessage = ex.Message;
235 }
236 }
237 }
238 }
时间： 2024-10-12 21:39:15