我想创建一个类来抽象我的业务逻辑等我的SQLite方法但是,我似乎无法访问我的数据库,因为它看起来好像它永远不会创建。请参阅下面的代码。我打开指定路径的数据库。然后我关闭它。关闭后,我使用终端检查我的Documents目录(在应用程序内)。在这一点上,我没有指定它的文件。当我向数据库中插入数据时它只创建文件吗?或者我没有正确创建数据库?我的ios sqlite3数据库没有被创建
#import "SQLController.h"
@implementation SQLController
@synthesize database;
-(id)initWithDefaultDB {
return [self initWithDBPath:[self dbFilePath]];
}
-(id)initWithDBPath:(NSString *)dbPath {
self = [super init];
if(self) {
sqlite3 *db;
const char *dbPathCString = [dbPath UTF8String];
int result = sqlite3_open(dbPath, &db);
if (result != SQLITE_OK) {
NSString *errorTag = @"Failed to open database at ";
NSString *errorMessage = [errorTag stringByAppendingString:dbPath];
NSLog(errorMessage);
sqlite3_close(db);
} else {
const char *createQuery = "CREATE TABLE IF NOT EXISTS items (title TEXT, details TEXT, category TEXT);";
self.database = db;
char *error;
if (sqlite3_exec(self.database, createQuery, NULL, NULL, &error) != SQLITE_OK) {
sqlite3_close(self.database);
NSLog(@"Failed to create table");
NSAssert(0,@"Error creating table: %s", error);
}
}
}
return self;
}
-(NSString *)dbFilePath {
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
return [documentsDirectory stringByAppendingPathComponent:@"testdb.sqlite"];
}
@end
sqlite3_open(DBPATH,&db); - 。和编译器没有告诉你,你通过的NSString而不是C字符串任何 –