我想将3段数据添加到SQLite3数据库。在教程的帮助下,我快到了。以下是我的代码。从Xcode内向SQLite3数据库添加数据
我收到了我期望从NSLogs
得到的结果。我发现数据库没有问题,我编译声明发送到数据库没有问题,但当应用程序到达sqlite3_prepare_v2(database, sqlstatement, -1, &compliedstatement, NULL)==SQLITE_OK
我期待数据被添加到DB
,但它不是,我也期待显示一个UIAlertView
以告诉用户ERROR OS SUCCESS。我希望你能看到我没有的东西。
- (IBAction)addData:(id)sender {
NSString *n = [[NSString alloc] initWithString:[name text]];
NSString *a = [[NSString alloc] initWithString:[age text]];
NSString *c = [[NSString alloc] initWithString:[color text]];
NSLog(@"%@ - %@ - %@",n,a,c);
[self insertDataName:n Age:a Color:c];
}
这个NSLog
如预期的那样返回文本属性。
- (IBAction)hide:(id)sender {
[name resignFirstResponder];
[age resignFirstResponder];
[color resignFirstResponder];
}
- (void)viewDidLoad
{
[super viewDidLoad];
DBName = @"mydatabase.sqlite";
NSArray *documentsPaths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDir = [documentsPaths objectAtIndex:0];
DBPath = [documentsDir stringByAppendingPathComponent:DBName];
}
-(void)checkAndCreateDB {
BOOL Success;
NSFileManager *fileManager = [NSFileManager defaultManager];
Success = [fileManager fileExistsAtPath:DBPath];
if(Success) {
NSLog(@"DB Found");
return;
}
NSLog(@"DB Not Found");
NSString *databasePathFromApp = [[[NSBundle mainBundle]resourcePath]stringByAppendingPathComponent:DBName];
[fileManager copyItemAtPath:databasePathFromApp toPath:DBPath error:nil];
}
这NSLog
回报
-(void)insertData Name:(NSString*)n Age:(NSString*)a Color:(NSString*)c {
[self checkAndCreateDB];
sqlite3 *database;
if (sqlite3_open([DBPath UTF8String],&database)==SQLITE_OK) {
NSString *statement;
sqlite3_stmt *compliedstatement;
statement = [[NSString alloc] initWithFormat:@"insert into table1 values ('%@', '%@', '%@')",n,a,c];
const char *sqlstatement = [statement UTF8String];
NSLog(@"%@",statement);
if (sqlite3_prepare_v2(database, sqlstatement, -1, &compliedstatement, NULL)==SQLITE_OK) {
if (SQLITE_DONE!=sqlite3_step(compliedstatement)) {
NSAssert1(0, @"Error by inserting '%s'", sqlite3_errmsg(database));
UIAlertView *AlertOK = [[UIAlertView alloc] initWithTitle:@"Error!" message:@"Error by inserting" delegate:self cancelButtonTitle:@"OK" otherButtonTitles:nil];
[AlertOK show];
}
else {
UIAlertView *AlertOK = [[UIAlertView alloc] initWithTitle:@"Success!" message:@"Data successfully inserted" delegate:self cancelButtonTitle:@"OK" otherButtonTitles: nil];
[AlertOK show];
}
}
sqlite3_finalize(compliedstatement);
}
sqlite3_close(database);
}
而最后NSLog
上面显示insert into table1 values ('n', 'a', 'c')
为我所期望的。
插入时出现错误,我无法弄清楚。
仅供参考数据库是使用SQLiteManager创建的。 SS下面:
你能更具体的到底发生了什么?你的陈述已经准备好,但是你面对的是什么样的错误?这是(SQLITE_DONE!= sqlite3_step(compliedstatement))执行?那么发生了什么? – Byte 2012-01-27 20:28:47
我得到了'UIAlertView'成功,但是当我在SQLiteManager中打开我的数据库并从'table1'中选择*时,有0个条目。 – 2012-01-28 00:08:36