android-sqlite

问题 I'm upgrading some legacy to target Android Q, and of course this code stop working: String[] PROJECTION_BUCKET = {MediaStore.Images.ImageColumns.BUCKET_ID, MediaStore.Images.ImageColumns.BUCKET_DISPLAY_NAME, MediaStore.Images.ImageColumns.DATE_TAKEN, MediaStore.Images.ImageColumns.DATA, "COUNT(" + MediaStore.Images.ImageColumns._ID + ") AS COUNT", MediaStore.Files.FileColumns.MEDIA_TYPE, MediaStore.MediaColumns._ID}; String BUCKET_GROUP_BY = " 1) and " + BUCKET_WHERE.toString() + " GROUP BY

问题 I am trying to squeeze every little bit of performance out of SQLite and I have a problem which seems to be odd, in that the functionality seems pointless in SQLite. Take for example: CREATE TABLE "A_TEST" ( "ID" INTEGER PRIMARY KEY , "X" TEXT NULL) WITHOUT ROWID then try to insert a record: Insert into A_TEST (X) VALUES('Test String') You will get an error of "NOT NULL constraint failed" Does this mean, with a WithoutRowID , I have to specify my own Primary Key Value when inserting? The

问题 I m getting following error:while accessing database from two different threads using single database object throughout the application The connection pool for database '/data/data/msv_database.db' has been unable to grant a connection to thread 802 ( Connections: 0 active, 1 idle, 0 available. 回答1: Probably you want to select query on a table which is used on a transaction without ended transaction before. Try to execute endTransaction() on finally block of transaction. OR You are updating

问题 I m getting following error:while accessing database from two different threads using single database object throughout the application The connection pool for database '/data/data/msv_database.db' has been unable to grant a connection to thread 802 ( Connections: 0 active, 1 idle, 0 available. 回答1: Probably you want to select query on a table which is used on a transaction without ended transaction before. Try to execute endTransaction() on finally block of transaction. OR You are updating

问题 I am getting the above problem, and am unable to solve even while looking at other similar questions and their solutions, as well as the sqlite document on foreign keys. I understand that a foreign key must exist in the parent table first before it can be created in the child table. However, even though that was done first the problem is still there. This is how my program flows until the point where it crashes: MainActivity -> Create Trip -> Shows up as a RecyclerView -> Click on it to enter

问题 This is my adapter class:- public class adapter_cgpa extends RecyclerView.Adapter<adapter_cgpa.Viewholder> { ArrayList<POJO> cgpaArrayList; public adapter_cgpa(ArrayList<POJO> cgpaArrayList) { this.cgpaArrayList = cgpaArrayList; } @NonNull @Override public adapter_cgpa.Viewholder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) { View listitem = LayoutInflater.from(parent.getContext()).inflate(R.layout.recycler_cgpa, parent, false); return new Viewholder(listitem); } @Override

问题 I try to use a Window Functions in a Room Query. The parser is complaining about my query. I simply try to add a "ROW_NUMBER() OVER (ORDER BY column)" expression in my select statement. Without this expression, the query is running correctly. Parser error: extraneous input '(' expecting {<EOF>, ';', ',', K_ALTER, K_ANALYZE, K_ATTACH, K_BEGIN, K_COMMIT, K_CREATE, K_DELETE, K_DETACH, K_DROP, K_END, K_EXCEPT, K_EXPLAIN, K_FROM, K_GROUP, K_INSERT, K_INTERSECT, K_LIMIT, K_ORDER, K_PRAGMA, K

问题 I have a table called games that has a column called platforms , which contains a list of platform abbreviations. This is a list of all the platforms that specific game came out on. Here's an example of one of the cells in platforms : AMI,GG,SNES,CPC,AST,C64,SPEC,MAC,PS2,NES,3DO,ARC,XBGS,PS3N,PC,IPHN,DSI,HALC,PSPN,ANDR, The user can choose any number of platforms they wish to view games for. For example, they may choose to see games for the following platforms: SNES, MAC, PC So I need a way

问题 I have a table called games that has a column called platforms , which contains a list of platform abbreviations. This is a list of all the platforms that specific game came out on. Here's an example of one of the cells in platforms : AMI,GG,SNES,CPC,AST,C64,SPEC,MAC,PS2,NES,3DO,ARC,XBGS,PS3N,PC,IPHN,DSI,HALC,PSPN,ANDR, The user can choose any number of platforms they wish to view games for. For example, they may choose to see games for the following platforms: SNES, MAC, PC So I need a way

问题 I have designed the database in SQLlite Browser. And now i am trying to copy it to my root path. Problem being faced Error Copying database LINK :- I am taking help from this example Link to add external Sqllite Db to app My DBhelper Class package com.example.demo; public class DBHelper extends SQLiteOpenHelper{ //The Android's default system path of your application database. private static String DB_PATH = "/data/data/com.example.demo/databases/"; private static String DB_NAME =