realm database ios

IOS-FMDB transaction [batch update database], ios-fmdb transaction database Open a database (sqlite) /// Open the database + (BOOL) openDataBase {_ TYDatabase = [[FMDatabase alloc] initWithPath: [self databasePath]; if ([_ TYDatab

[Reading Notes] iOS-saving information using SQL database, ios-SQL Whether the BLOB field can be used to save images is a good method is still controversial, except for small images. A more common method is to save an image as a file, and then only save the metadata of the image file in the data, such as the file path. However, if you want to package a data file

]; [Sharedatabase close]; }}Delete a database tableDelete part+ (void) Deleteac: (nsstring*) Iuno with: (nsstring*) ouno{ [self init]; if ([sharedatabase Open]) { [Sharedatabase executeupdate: @ "Delete from inner_ac_info where iu_no =?" and Ou_no =? " , Iuno, Ouno];[Sharedatabase close]; }}Delete all+ (void) deleteallac{[self init]; if ([sharedatabase Open]) { [Sharedatabase executeupdate: @ "Delete from Inner_ac_info"];[Sharedatabase c

IOS _ database 2 _ basic knowledge, basic knowledge of iosBasic Database knowledge 1)Select B. name from book as a, student as B where a. title like 'database originalLi ';2)Select a. sid form student as a, lend as B, return as c where (B. sid =A. sid or c. sid = a. sid) and ldate = rdate;3)Select distinct (t. title) t

Introduction of SQLiteSQLite is a pure C implementation, so doomed it is a cross-platform tool, both under the Android and iOS can be used, but also can write common code, convenient for us to transplant. Of course, Android and iOS have encapsulated SQLite for developers to use, but this is not easy to transplant, the other is the efficiency of the package after how we do not know, so or the original ecolog

char * type, the second parameter is a pointer to the database handle, the note is a two-level pointer, the one-level pointer we declare, so we'll add an address character, and look at my example below: int ret = Sqlite3_open (GetFilePath (), pdb); Don't be surprised, actually open the database is to get some information about the database, a

Trim (class_name) from T_classReplaceSelect Replace (class_name,' C ',' O ') from T_class// length ( space also count length )Select Length (class_name) from T_class// Date functionSelect Date () from T_classSelect DateTime () from T_class// judged to be emptySELECT * from T_class where class_name is nullSortSELECT * from T_class ORDER BY class_id Desc(reverse)SELECT * from T_class ORDER by class_id ASC ( Positive order,ASC can save default positive order )@endiOS UI

instructions to allow MySQL to log in without verification, after the successful login, using MySQL workbench to modify the user password. The solution for MySQL root password forgetting or permissions error on MAC is shown in the MySQL database configuration section of this article. 4.2 Anonymous User Login If you are prompted for Access denied "@ ' localhost ' to database ' MySQL ' at logon,

Basic operations for adding, deleting, modifying, and querying the FMDN database of the iOS Database FMDB (https://github.com/ccgus/fmdb) is not much to say first to add this library, in will be added, OK preparation work ready code. # Import "DDViewController. h" # Import "FMDB. h" @ Interface DDViewController () { FMDatabase * db; } @ End @ Implementation DD

Fmdb (https://github.com/ccgus/fmdb) Words do not say the first to add this library, in will add in, OK ready to work on the code. #import "DDViewController.h"#import "FMDB.h"@interface ddviewcontroller (){ fmdatabase *db;}@end@implementation Ddviewcontroller/*** to have a location to store the database iOS document Path,document is a writable folder in iOS and

data links between the two tables. In order to be able to query the corresponding data through a table of data, can be a yo foreign key to associateTable (ID name age), table (ID person ...)Associate the ID in a as a foreign key and a person in BCode　　　　　　Note: Using references keywords, you can bind foreign key associations. In general, binding a primary key in another table is the best choice. When inserting data, it is important to note that the value of the foreign key must be able to exist

iOS Development database Chapter-fmdb Database queue (bottom)One, code example1. You need to import the Fmdb framework and header files first, since the framework relies on the Libsqlite library, you should also import the library.2. The code is as follows:1//2//Yyviewcontroller.m3//05-fmdb Database Queue4//5//Created

iOS Development database Chapter-fmdb Database queueOne, code example1. You need to import the Fmdb framework and header files first, since the framework relies on the Libsqlite library, you should also import the library.2. The code is as follows:1 //2 //YYVIEWCONTROLLER.M3 //05-fmdb Database Queue4 //5 //Created by A

IOS database operation fmdb1: used by the FMDB DatabaseFMDatabase1. download the src file in the FMDatabase import and download and delete the fmdb. m file 2. introduce framework: libsqlite3.dylib3. introduce the header file # import "FMDatabase. h "database files must be compatible with iPhone 4 and iPhone 5 in the Document or Library directory. First, judge the

analytic way of thinking routines, JSON parsing. Now the main is the XML, JSON these two formats, large companies have JSON format for you, but also can not avoid some you really want to use the data company only provide XML.Here because I think the team is not enough level, third-party companies will not give you the opportunity to interact with the server autonomously, but will give you API operations. Not to mention is the personal development, mainly in the operation of data exchange file-b

First, the databaseIn project development, it is usually necessary to deal with the offline cache of data, such as offline caching of news data. Offline caching typically saves data to the project's sandbox. There are several ways to do this:1. Archive: NSKeyedArchiver2. Preferences: NSUserDefaults3. plist Storage:writeToFileThe use of the above can refer to iOS Learning Note 15-serialization, preferences and archiving, but the above three methods hav

SQLite (http://www.sqlite.org/docs.html) is a lightweight relational database. SQLite was originally designed for embedded systems. It occupies a very small amount of resources. In embedded devices, only a few hundred KB of memory is required, it is currently applicable to Android, IOS, Windows Phone, and other smartphones. When using SQLite in iOS, you only need

Access the SQLite database by using the Qt5 iOS app, qt5sqlite Development Environment:MacOS 10.12.1Xcode 8.1Qt 5.8 iPhone 6 S + iOS 10.1.1 Source code:I specified the database name in the Qt program to create a database. It runs normally in Win10, Android, and macOS, but an

Php receives emoji expressions in ios and saves them to the database ????. Php receives emoji expressions in ios and saves them to the database ????. According to the Internet, the database code is changed to utf8mb4. the database

introductionHow data is stored in 1.ios(1) Plist (nsarray\nsdictionary)(2) Preference (preference setting \nsuserdefaults)(3) nscoding (Nskeyedarchiver\nskeyedunarchiver)(4) SQLite3(5) Core DataDescription3 is the version number, which is the third version of SQLite. Core data is a package for SQLite because the SQLite used in iOS is a pure C language. 2.SQLite(1) What is SQLite?A: SQLite is a lightweight