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iOS 使用FMDB进行数据库操作

时间:2015-04-08 18:10:41      阅读:228      评论:0      收藏:0      [点我收藏+]

标签:ios开发   数据库   

1、首先要先导入第三方类库FMdatabase。

2、获得存放数据库文件的沙盒地址。

+(NSString*)databaseFilePath
2 {
3  
4 NSArray*filePath=NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,NSUserDomainMask,YES);
5 NSString*documentPath=[filePathobjectAtIndex:0];
6 NSLog(@"%@",filePath);
7 NSString*dbFilePath=[documentPathstringByAppendingPathComponent:@"db.sqlite"];
8 returndbFilePath;
9  
10 }

3、创建数据库的操作

+(void)creatDatabase
2 {
3 db =[[FMDatabasedatabaseWithPath:[selfdatabaseFilePath]]retain];
4 }

4、创建表

+(void)creatTable
2 {
3 //先判断数据库是否存在,如果不存在,创建数据库
4 if(!db){
5 [selfcreatDatabase];
6 }
7 //判断数据库是否已经打开,如果没有打开,提示失败
8 if(![dbopen]){
9 NSLog(@"数据库打开失败");
10 return;
11 }
12  
13 //为数据库设置缓存,提高查询效率
14 [dbsetShouldCacheStatements:YES];
15  
16 //判断数据库中是否已经存在这个表,如果不存在则创建该表
17 if(![dbtableExists:@"people"])
18 {
19 [dbexecuteUpdate:@"CREATETABLES people(people_id INTEGER PRIMARY KEY AUTOINCREAMENT, nameTEXT, age INTEGER) "];
20  
21  
22 NSLog(@"创建完成");
23 }
24  
25 }

5、增加表数据

+(void)insertPeople:(People*)aPeople
2 {
3 if(!db){
4 [selfcreatDatabase];
5 }
6  
7 if(![dbopen]){
8 NSLog(@"数据库打开失败");
9 return;
10 }
11  
12 [dbsetShouldCacheStatements:YES];
13  
14 if(![dbtableExists:@"people"])
15 {
16 [selfcreatTable];
17 }
18 //以上操作与创建表是做的判断逻辑相同
19 //现在表中查询有没有相同的元素,如果有,做修改操作
20 FMResultSet*rs=[dbexecuteQuery:@"select* from people where people_id = ?",[NSStringstringWithFormat:@"%d",aPeople.peopleID]];
21 if([rsnext])
22 {
23 NSLog(@"dddddslsdkien");
24 [dbexecuteUpdate:@"updatepeople set name = ?, age = ? where people_id =1",aPeople.name,[NSStringstringWithFormat:@"%d",aPeople.age]];
25 }
26 //向数据库中插入一条数据
27 else{
28 [dbexecuteUpdate:@"INSERTINTO people (name, age) VALUES(?,?)",aPeople.name,[NSStringstringWithFormat:@"%d",aPeople.age]];
29 }
30  
31 }

6、删除数据

+(void)deletePeopleByID:(int)ID
2 {
3 if(!db){
4 [selfcreatDatabase];
5 }
6  
7 if(![dbopen]){
8 NSLog(@"数据库打开失败");
9 return;
10 }
11  
12 [dbsetShouldCacheStatements:YES];
13  
14 //判断表中是否有指定的数据, 如果没有则无删除的必要,直接return
15 if(![dbtableExists:@"people"])
16 {
17 return;
18 }
19 //删除操作
20 [dbexecuteUpdate:@"deletefrom people where people_id = ?", [NSStringstringWithFormat:@"%d",ID]];
21  
22 [dbclose];
23 }

7、修改操作与增加操作的步骤一致

+(NSArray*)getAllPeople
2 {
3  
4 if(!db){
5 [selfcreatDatabase];
6 }
7  
8 if(![dbopen]){
9 NSLog(@"数据库打开失败");
10 returnnil;
11 }
12  
13 [dbsetShouldCacheStatements:YES];
14  
15 if(![dbtableExists:@"people"])
16 {
17 returnnil;
18 }
19  
20 //定义一个可变数组,用来存放查询的结果,返回给调用者
21 NSMutableArray*peopleArray=[[NSMutableArrayalloc]initWithArray:0];
22 //定义一个结果集,存放查询的数据
23 FMResultSet*rs=[dbexecuteQuery:@"select* from people"];
24 //判断结果集中是否有数据,如果有则取出数据
25 while([rsnext]){
26 People*aPeople=[[Peoplealloc]init];
27  
28 aPeople.peopleID=[rsintForColumn:@"people_id"];
29 aPeople.name =[rsstringForColumn:@"name"];
30 aPeople.age =[rsintForColumn:@"age"];
31 //将查询到的数据放入数组中。
32 [peopleArrayaddObject:aPeople];
33 }
34 return[peopleArrayautorelease];
35 }

8、查询

+(NSArray*)getAllPeople
2 {
3  
4 if(!db){
5 [selfcreatDatabase];
6 }
7  
8 if(![dbopen]){
9 NSLog(@"数据库打开失败");
10 returnnil;
11 }
12  
13 [dbsetShouldCacheStatements:YES];
14  
15 if(![dbtableExists:@"people"])
16 {
17 returnnil;
18 }
19  
20 //定义一个可变数组,用来存放查询的结果,返回给调用者
21 NSMutableArray*peopleArray=[[NSMutableArrayalloc]initWithArray:0];
22 //定义一个结果集,存放查询的数据
23 FMResultSet*rs=[dbexecuteQuery:@"select* from people"];
24 //判断结果集中是否有数据,如果有则取出数据
25 while([rsnext]){
26 People*aPeople=[[Peoplealloc]init];
27  
28 aPeople.peopleID=[rsintForColumn:@"people_id"];
29 aPeople.name =[rsstringForColumn:@"name"];
30 aPeople.age =[rsintForColumn:@"age"];
31 //将查询到的数据放入数组中。
32 [peopleArrayaddObject:aPeople];
33 }
34 return[peopleArrayautorelease];
35 }

iOS 使用FMDB进行数据库操作

标签:ios开发   数据库   

原文地址:http://blog.csdn.net/wangzhaobin/article/details/44943243

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