sqlite

Shipping a pre populated SQLite DB within the app. Path of the DB on startup

由 邮差的信 提交于 2020-01-16 08:55:16
问题 Maybe the title of the question is not very self-explanatory but I don't know how to summ it up. I'm finishing an App which is basically a DB. I will ship a DB within the App. Everything works well but now I came to the problem. When the App is installed, it needs to create the database on the device. So, I dragged the DB to the "Supporting Files" folder in my Xcode project (still Xcode 4.1, by the way). I went to the AppDelegate.m file and looked for the (NSPersistentStoreCoordinator *

Problem pushing sqlite3 db to heroku: lib/taps/schema.rb:30:in `sqlite_config': undefined method `[]' for nil:NilClass (NoMethodError)

由 倾然丶 夕夏残阳落幕 提交于 2020-01-16 05:17:15
问题 I have a Sinatra DataMapper app hitting a sqlite3 database that I am attempting to deploy to Heroku. First pass, I included my database file in the git repo. This works, as in the app runs, but production data does not belong in the repository. It doesn't really work though because the database is read-only. I then removed the db file for source control and attempted a heroku db:push sqlite://db/my-app.db . This command yields the following stact trace: my-app/(master) ~ heroku db:push sqlite

sqlite constraint exception primary key must be unique

由 旧街凉风 提交于 2020-01-16 04:04:13
问题 I have 3 tables Table 1 : Member - To store every information about the member, Attribute : MemberUsername(PK), MemberPassword Table 2 : MsGroup - To store every registered group Attribute : GroupId(PK), GroupName, GroupDescription Table 3 : MsGroupDetail - To store list of every username in every group Attribute : GroupId(PK,FK), MemberUsername(PK,FK) My Query for Creating that 3 tables : db.execSQL("CREATE TABLE IF NOT EXISTS " + MS_MEMBER + " (" + MEMBER_USERNAME + " TEXT PRIMARY KEY NOT

C++封装SQLite实例<三>

由 点点圈 提交于 2020-01-16 04:01:00
前一篇博客中介绍的是怎样依据sqlite3_get_table()函数来获取一张表的内容，就是一股脑的把表中的内容所有存储起来放在一个一维数组中，这其中的规则已经介绍过了。接下来讲的是怎样依据一个SQL查询语句来挑选出合乎选择条件的记录，被挑选出的记录事先是不知道的。你不知道这个查询的结果中有几行更不知道每一行中详细的记录值是什么，所以没办法用给定行值和列值的方式来获取数据，所有之前的用数组存储表的方式即可不通了。想要灵活的管理一个查询返回的结果这就会复杂多了，用到的SQLite原生函数也非常多。 这个CppSQLite3Query类中有四个字段，各自是 sqlite3 *mpDB; sqlite3_stmt *mpStmt; bool mbEof; //因为查询的结果须要一行一行的訪问，所以设置一个bool值来表示是否达到最后一行的结尾 int mnCols; //表示这个查询结果的列数，行数是无法得知的 第一个參数：查询要连接的数据库 第二个參数： ** CAPI3REF: SQL Statement Object ** KEYWORDS: {prepared statement} {prepared statements} ** ** An instance of this object represents a single SQL statement. ** This

Creating 140,000-row SQLite database in AsyncTask doInBackground taking many, many minutes

由 与世无争的帅哥 提交于 2020-01-16 03:49:26
问题 I haven't dealt with SQLite databases before last week. I last dealt with SQL many years ago, but I still have the gist of it. The code below reads 140,000 words from an asset named dictionary.dic and inserts each into a SQLite database along with its status . My expectation was that it would take a good while, but it's been like 25 minutes on a 7" tablet and still not near finished (on P ). Should I say, "Hey, it's 1/7 of a million rows. It's gonna take awhile." But I can read all 140,000

Creating 140,000-row SQLite database in AsyncTask doInBackground taking many, many minutes

由 依然范特西╮ 提交于 2020-01-16 03:49:11
问题 I haven't dealt with SQLite databases before last week. I last dealt with SQL many years ago, but I still have the gist of it. The code below reads 140,000 words from an asset named dictionary.dic and inserts each into a SQLite database along with its status . My expectation was that it would take a good while, but it's been like 25 minutes on a 7" tablet and still not near finished (on P ). Should I say, "Hey, it's 1/7 of a million rows. It's gonna take awhile." But I can read all 140,000

Insert multiple row data same time sqlite with json ios

由 不羁岁月 提交于 2020-01-16 03:41:05
问题 I am trying to insert multiple row data same time to the sqlite database.But for example I have a value.I am getting that from my api.And in this value I have 2000 data.I am just adding 1 row and in that row I Can see 2000 data. for (NSDictionary *customerDictionary in customerArray) { Kart *kart = [Kart customerWithName:[customerDictionary valueForKey:@"adi"]]; [_kartList addObject:kart]; } And I am using FMDB for the sqlite. EDIT I can add the one data to the sqlite db with that.But when I

Copy column from one table to another table but it hangs DB Browser for SQLite

由 给你一囗甜甜゛ 提交于 2020-01-16 02:26:47
问题 I want to copy one table's column to another table's column with where condition that both employee id should be equal, more than 300k records. below is my query UPDATE emp SET emp.address = ( SELECT emp_address FROM address WHERE emp.emp_id=address.emp_id LIMIT 1 ); I have executed this query since last 1 hour but still process is going on, I have executed this query on "DB Browser for SQLite". Am I making any mistake? or there is problem with sqlite browser? 回答1: For this query: UPDATE emp

Update app with preloaded SQLite

由 南笙酒味 提交于 2020-01-16 01:22:29
问题 My app uses a preloaded and copied from /assets to data/data ( Ship an application with a database) db which is simply a single table of product data and is 'read only' as users do not save to the DB. If I add more products to the DB table I need to get this to existing users. If I update my app with the new DB will the update process delete the old DB that was copied from the assets dir to data/data thereby allowing the 'DBexists' check to fail on first running the updated version thus

Update app with preloaded SQLite

由 ▼魔方 西西 提交于 2020-01-16 01:22:14
问题 My app uses a preloaded and copied from /assets to data/data ( Ship an application with a database) db which is simply a single table of product data and is 'read only' as users do not save to the DB. If I add more products to the DB table I need to get this to existing users. If I update my app with the new DB will the update process delete the old DB that was copied from the assets dir to data/data thereby allowing the 'DBexists' check to fail on first running the updated version thus
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