sqlite

问题 I am coding a Xamarin Android application, and am getting an error when trying to create a SQLite database. Here is my code: string applicationFolderPath = System.IO.Path.Combine(System.Environment.GetFolderPath(System.Environment.SpecialFolder.Personal), "CanFindLocation"); string databaseFileName = System.IO.Path.Combine(applicationFolderPath, "CanFindLocation.db"); SQLite.SQLite3.Config(SQLite.SQLite3.ConfigOption.Serialized); var db = new SQLiteConnection (databaseFileName); Here is the

问题 I am coding a Xamarin Android application, and am getting an error when trying to create a SQLite database. Here is my code: string applicationFolderPath = System.IO.Path.Combine(System.Environment.GetFolderPath(System.Environment.SpecialFolder.Personal), "CanFindLocation"); string databaseFileName = System.IO.Path.Combine(applicationFolderPath, "CanFindLocation.db"); SQLite.SQLite3.Config(SQLite.SQLite3.ConfigOption.Serialized); var db = new SQLiteConnection (databaseFileName); Here is the

问题 hii every one I need to add one column to my existing table so how can i alter table in sqlite database through the obj c ,i am using the following code for inserting data into table in the same way how can i write updata table method - (void) InsertRecord { if(addStmt == nil) { const char *sql = "insert into tbl_Users(FirstName,MiddleName) Values(?,?)"; if(sqlite3_prepare_v2(database, sql, -1, &addStmt, NULL) != SQLITE_OK) NSAssert1(0, @"Error while creating add statement. '%s'", sqlite3

问题 I am currently following the Ruby on Rails Tutorial and I am at https://www.railstutorial.org/book/updating_and_deleting_users#sec-administrative_users Every time I run bundle exec rake db:migrate I get the following error: SQLite3::SQLException: duplicate column name: remember_digest: ALTER TABLE "users" ADD "remember_digest" varchar/home/mclacs14/.rvm/gems/ruby-2.0.0-p481@railstutorial_rails_4_0/gems/sqlite3-1.3.9/lib/sqlite3/database.rb:91:in `initialize' 回答1: try migrating your DB to

问题 I am currently following the Ruby on Rails Tutorial and I am at https://www.railstutorial.org/book/updating_and_deleting_users#sec-administrative_users Every time I run bundle exec rake db:migrate I get the following error: SQLite3::SQLException: duplicate column name: remember_digest: ALTER TABLE "users" ADD "remember_digest" varchar/home/mclacs14/.rvm/gems/ruby-2.0.0-p481@railstutorial_rails_4_0/gems/sqlite3-1.3.9/lib/sqlite3/database.rb:91:in `initialize' 回答1: try migrating your DB to

问题 Im building an app which uses Sqlite DB. Users can enter their information into the db and retrieve them. However, I want them to be able to backup the sqlite db. What I did was putting the sqlite db in the documents folder, so they could retrieve it out using iTunes. For example if the ipad is faulty, i want them to be able to transfer the sqlite db to another ipad. The problem now is, I dont want them to know the information inside the db, should say the db structure. So how can I build a

问题 is there a way to set the placeholder for queries in sqlite3 ? I have some functions that work with a database and it would be more satisfying if they could work both with mysql and sqlite. Mysql and Postgres python apis use the %s as a placeholder, but sqlite3 use a question mark instead. I'm looking for a way to use the same placeholder whatever the database engine. Thanks for your help. 回答1: Updated to fix my earlier error about how to use the paramstyle global If the DB modules you use

问题 is there a way to set the placeholder for queries in sqlite3 ? I have some functions that work with a database and it would be more satisfying if they could work both with mysql and sqlite. Mysql and Postgres python apis use the %s as a placeholder, but sqlite3 use a question mark instead. I'm looking for a way to use the same placeholder whatever the database engine. Thanks for your help. 回答1: Updated to fix my earlier error about how to use the paramstyle global If the DB modules you use

问题 public Cursor fetchTimetable() { return mDb.query(DATABASE_TABLE_TIMETABLE, new String[] {TIMETABLE_ROWID, TIMETABLE_MODULECODE, TIMETABLE_MODULENAME, TIMETABLE_ROOM, TIMETABLE_LECTURER, TIMETABLE_TIME}, null, null, null, null, null); } For example if i wanted TIMETABLE_MODULECODE = 123. How would i do this, i have read its the first null. I have tried this below but still doesnt work public Cursor fetchTimetable() { String a = "TIMETABLE_CODE = ADD"; return mDb.query(DATABASE_TABLE_TIMETABLE

问题 I'll use RecyclerView for a section header I want to create section header when i insert each Date & Time data in SQLite Database I followed below links for this solution but haven't been successful Recyclerview Dynamic Sections not using any 3rd lib Add two sections in recyclerview android Please refer the below image For above image data using below code OR Section is Static : List<Company> childList = new ArrayList<>(); List<CompanySectionHeader> sectionHeaders = new ArrayList<>();