ios数据存储方式FMDB

本文转载至 http://blog.csdn.net/chen505358119/article/details/9289489

分类： ios2013-07-10 14:05 2471人阅读 评论(0) 收藏 举报

从网上下载FMDB的原码,将其拖入到项目中，然后在Link Binary With Libraries中添加libsqlite3.dylib,就可以用了

实现如下：

1. #import "ViewController.h"
2. #import "FMDatabase.h"
3. #import "FMDatabaseAdditions.h"
4. #import "FMDatabaseQueue.h"
5. @interface ViewController ()
6. @end
7. @implementation ViewController
8. - (void)viewDidLoad
9. {
10. [super viewDidLoad];
11. // Do any additional setup after loading the view, typically from a nib.
12. }
13. - (void)didReceiveMemoryWarning
14. {
15. [super didReceiveMemoryWarning];
16. // Dispose of any resources that can be recreated.
17. }
18. - (void)dealloc {
19. [_nameText release];
20. [_ageText release];
21. [_sexText release];
22. [_showLabel release];
23. [super dealloc];
24. }
25. - (void)viewDidUnload {
26. [self setNameText:nil];
27. [self setAgeText:nil];
28. [self setSexText:nil];
29. [self setShowLabel:nil];
30. [super viewDidUnload];
31. }
32. //保存
33. - (IBAction)saveBtn:(id)sender {
34. FMDatabase* database=[FMDatabase databaseWithPath:[self databasePath]];
35. if (![database open]) {
36. NSLog(@"Open database failed");
37. return;
38. }
39. if (![database tableExists:@"user"]) {
40. [database executeUpdate:@"create table user (id integer primary key autoincrement not null,name text,age integer,sex text)"];
41. }
42. BOOL insert=[database executeUpdate:@"insert into user (name,age,sex) values (?,?,?)",_nameText.text,[NSNumber numberWithInteger:[_ageText.text integerValue]],_sexText.text];
43. //下面注释的也能实现数据的插入,只不过它是传入了字典
44. //    NSMutableDictionary* argsDict=[NSMutableDictionary dictionary];
45. //    [argsDict setObject:_nameText.text forKey:@"name"];
46. //    [argsDict setObject:_ageText.text forKey:@"age"];
47. //    [argsDict setObject:_sexText.text forKey:@"sex"];
48. //    BOOL insert=[database executeUpdate:@"insert into user (name,age,sex) values (:name,:age,:sex)" withParameterDictionary:argsDict];
49. if (insert) {
50. UIAlertView* alert=[[UIAlertView alloc] initWithTitle:@"提示" message:@"保存成功" delegate:nil cancelButtonTitle:nil otherButtonTitles:@"确定",nil];
51. [alert show];
52. [alert release];
53. }else{
54. NSLog(@"insert failed");
55. }
56. [database close];
57. //下面注释的这一段也是创建表只不过它是多线程安全的，而上面的在多线程中是不安全的
58. //    FMDatabaseQueue* queue=[FMDatabaseQueue databaseQueueWithPath:[self databasePath]];
59. //    [queue inDatabase:^(FMDatabase* database){
60. //        if (![database tableExists:@"user"]) {
61. //            [database executeUpdate:@"create table user (id integer primary key autoincrement not null,name text,age integer,sex text)"];
62. //        }
63. //        BOOL insert=[database executeUpdate:@"insert into user (name,age,sex) values (?,?,?)",_nameText.text,[NSNumber numberWithInteger:[_ageText.text integerValue]],_sexText.text];
64. //        if (insert) {
65. //            UIAlertView* alert=[[UIAlertView alloc] initWithTitle:@"提示" message:@"保存成功" delegate:nil cancelButtonTitle:nil otherButtonTitles:@"确定",nil];
66. //            [alert show];
67. //            [alert release];
68. //        }else{
69. //            NSLog(@"insert failed");
70. //        }
71. //
72. //    }];
73. //    [queue close];
74. }
75. //显示所有数据库中的数据
76. - (IBAction)showBtn:(id)sender {
77. FMDatabase* database=[FMDatabase databaseWithPath:[self databasePath]];
78. if (![database open]) {
79. return;
80. }
81. //注意 此处的FMResultSet可以不用关闭，因为数据库关闭的时候FMResultSet自动关闭
82. FMResultSet* resultSet=[database executeQuery:@"select* from user"];
83. NSString* str=@"";
84. while ([resultSet next]) {
85. NSString* name=[resultSet stringForColumn:@"name"];
86. NSInteger age=[resultSet intForColumn:@"age"];
87. NSString* sex=[resultSet stringForColumn:@"sex"];
88. str=[str stringByAppendingFormat:@"Name:%@,Age:%d,Sex:%@\n",name,age,sex];
89. NSLog(@"Name:%@,Age:%d,Sex:%@\n",name,age,sex);
90. }
91. _showLabel.text=str;
92. [database close];
93. }
94. //查询
95. - (IBAction)checkBtn:(id)sender {
96. FMDatabase* database=[FMDatabase databaseWithPath:[self databasePath]];
97. if (![database open]) {
98. return;
99. }
100. FMResultSet* resultSet=[database executeQuery:@"select* from user where name = ?",@"chen"];
101. NSString* str=@"";
102. while ([resultSet next]) {
103. NSString* name=[resultSet stringForColumn:@"name"];
104. NSInteger age=[resultSet intForColumn:@"age"];
105. NSString* sex=[resultSet stringForColumn:@"sex"];
106. str=[str stringByAppendingFormat:@"Name:%@,Age:%d,Sex:%@\n",name,age,sex];
107. }
108. _showLabel.text=str;
109. [database close];
110. }
111. //删除
112. - (IBAction)deleteBtn:(id)sender {
113. FMDatabase* database=[FMDatabase databaseWithPath:[self databasePath]];
114. if (![database open]) {
115. return;
116. }
117. BOOL delete=[database executeUpdate:@"delete from user where name = ?",@"chen"];
118. if (delete) {
119. UIAlertView* alert=[[UIAlertView alloc] initWithTitle:@"提示" message:@"删除成功" delegate:nil cancelButtonTitle:nil otherButtonTitles:@"确定",nil];
120. [alert show];
121. [alert release];
122. }
123. [database close];
124. }
125. //更新
126. - (IBAction)updateBtn:(id)sender {
127. FMDatabase* database=[FMDatabase databaseWithPath:[self databasePath]];
128. if (![database open]) {
129. return;
130. }
131. BOOL update=[database executeUpdate:@"update user set age = ? where name= ?",[NSNumber numberWithInt:20],@"chen"];
132. if (update) {
133. UIAlertView* alert=[[UIAlertView alloc] initWithTitle:@"提示" message:@"更新成功" delegate:nil cancelButtonTitle:nil otherButtonTitles:@"确定",nil];
134. [alert show];
135. [alert release];
136. }
137. [database close];
138. }
139. -(NSString* )databasePath
140. {
141. NSString* path=[NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) objectAtIndex:0];
142. NSString* dbPath=[path stringByAppendingPathComponent:@"user.db"];
143. return dbPath;
144. }
145. @end