Question

当我们运行checkAndCreateDatabase方法时，它表示数据库存在，但sqlite3_error消息在退出方法之前返回“内存不足”错误。如何解决这个问题？

-(void) checkAndCreateDatabase{
NSLog(@"Run Method: checkAndCreateDatabase");
// Check if the SQL database has already been saved to the users phone, if not then copy it over
BOOL success;

// Create a FileManager object, we will use this to check the status
// of the database and to copy it over if required
// Check if the database has already been created in the users filesystem
success = [[NSFileManager defaultManager] fileExistsAtPath:databasePath];

// If the database already exists then return without doing anything
if(success){
    NSLog(@"Database Exists");
} else {

    // If not then proceed to copy the database from the application to the users filesystem
    NSLog(@"Database Does Not Exist");

    // Get the path to the database in the application package
    NSString *databasePathFromApp = [[[NSBundle mainBundle] resourcePath] stringByAppendingPathComponent:databaseName];

    // Copy the database from the package to the users filesystem
    [[NSFileManager defaultManager] copyItemAtPath:databasePathFromApp toPath:databasePath error:nil];
    NSLog(@"Database Copied To filesystem And Exists");
}
NSLog(@"Method checkAndCreateDatabase Finished Message: %s",sqlite3_errmsg(database));
return;
}

- (void)viewDidLoad {
NSLog(@"Run Method: viewDidLoad");
// Setup some globals
databaseName = @"w2w.db";
NSLog(@"Database Name: %@",databaseName);

// Get the path to the documents directory and append the databaseName
NSArray *documentPaths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDir = [documentPaths objectAtIndex:0];
databasePath = [documentsDir stringByAppendingPathComponent:databaseName];
NSLog(@"Database Path: %@",databasePath);

// Execute the "checkAndCreateDatabase" function
[self checkAndCreateDatabase];

[super viewDidLoad];
}

Answer 1

数据库变量在哪里被初始化？当我不小心将未定义或不正确的参数传递给sqlite3_errmsg（）时，我遇到了同样的错误消息。我认为这是默认的错误消息。

xcode sqlite3“内存不足”错误

1 个答案: