how to use sqlite editor

Label:An aggregate function performs a calculation on a set of values and returns a single value. An aggregate function performs a calculation on a set of values and returns a single value. In addition to COUNT, the aggregate function ignores null values. Aggregate functions are often used with the GROUP by clause of a SELECT statement.COUNT (*)--Returns the number of specified tablesFor example: SELECT COUNT (*) from Studen (where ...);SUM (*)-Returns the sum of data (only works on numeric type

("Phone")); -User=NewUserInfo (name,age,sex,phone); - list.add (user); the} while(Cursor.movetonext ()); - } - cursor.close (); - returnlist; +}4. Inserting a database Mydatabasehelper databases inherits to Databasehelper1 @Override2 Public voidsetuserinfo (mydatabasehelper database,userinfo user) {3Sqlitedatabase db=database.getwritabledatabase ();4Contentvalues values=Newcontentvalues ();5Values.put ("username", User.getname ());6Values.put ("Age", User.getage ());7Values

Cursor= Db.query (" Person",NULL,NULL,NULL,NULL,NULL,NULL); List_infor=NewArraylist(); while(Cursor.movetonext ()) {person infor=NewPerson (); intId=cursor.getint (Cursor.getcolumnindex ("ID")); String name=cursor.getstring (Cursor.getcolumnindex ("name")); String Number=cursor.getstring (Cursor.getcolumnindex (" Number")); Infor.setid (ID); Infor.setname (name); Infor.setnumber (number); List_infor.add (infor);

); } publicvoidadduser (Useruser) { //idnull Sqlitedatabasedb=helper.getwritabledatabase (); db.execsql ("insertintot_user (Name,pwd,age, Sex) values (?,?,?,?) ", Newobject[]{user.getname (), User.getpwd (), User.getage (), User.getsex ()}); db.close (); } publicvoidupdate (Intid,Stringname) { sqlitedatabasedb=helper.getwritabledatabase ( ); db.execsql ("Updatet_usersetname=?where id=? ", newobject[]{name,id}); db.close (); } publicvoiddelete (Intid) { sqlitedatabasedb=helper.getwritabledatab

OpenDatabase () {try {file Mydatapath = new File (Db_path); if (!mydatapath.exists ()) { Mydatapath.mkdirs ();//If you do not have this folder, create}string dbfile=mydatapath+ "/" +db_name;if (! New file (DBFile). Exists ())) {//infer that the database file exists, run the import if it does not exist, or open the database directly inputstream is = Context.getresources (). Openrawresource (R.RAW.IDIOM); Database to import fileoutputstream fos = new FileOutputStream (dbfile); byte[] buffer = new

, and once the execution fails, return to the original databaseDb.begintransaction ();//Start a transaction Try{db.delete ("Book",NULL,NULL); if(true) { //manually throw an exception here and let the transaction fail Throw NewNullPointerException (); } db.execsql (Insert into book (name, author, pages, price) VALUES (?,?,?,?) ", Newstring[]{"Marxism 2", "Chinese Communist Party", "1000", "100.00"});//Incredibly harmonious db.settransactionsuccessful ()

"; Instantiate the SQL Instruction object sqlitecommand CMDQ = new Sqlitecommand (SQL, conn); Store read value sqlitedatareader reader = Cmdq.executereader (); The control that displays the data richTextBox1.Text = ""; Reads each row of data while (reader. Read ()) { //reads and assigns a value to the control richTextBox1.Text + = reader. GetInt32 (0) + "" + Reader. Ge

In actual programming and development, we often need to process the storage of large-capacity binary data, such as slices or music. For these binary data (BLOB fields), we cannot simply insert or query the data as if we were dealing with common text. Therefore, SQLite provides a set of functions to process this blob field type. The followingCodeDemonstrate how to use these API functions. First, we need to

classCheckloginfilter:filterattribute, Iactionfilter { Public voidonactionexecuted (ActionExecutedContext filtercontext) {if(httpcontext.current.session["User"] ==NULL) {FilterContext.HttpContext.Response.Write ("-1"); } } Public voidonactionexecuting (ActionExecutingContext filtercontext) {if(httpcontext.current.session["User"] ==NULL) {Filtercontext.result=NewRedirectresult ("/account/index"); } } } } 3. Add a filter to the controller/homecontrollers.cs file: Di

viewcontroller.m//sqlitedemo////Created by Lam_tt on 15-4-11.//Copyright (c) 2015 Lam_tt. All rights reserved.//#import "ViewController.h" #import iOS SQLite simple to use

(food_id) DESC limit 10) top_foodsOn F. ID = top_foods.food_idIntersectSelect F. * from foods FInner join foods_episodes Fe on F. ID = Fe. food_idInner join episodes e on Fe. episode_id = E. IDWhere E. season between 3 and 5Order by F. Name; Except operates on the two relations A and B to find all rows in a but not in B: Select F. * from foods FInner join(Select food_id, count (food_id) as count from foods_episodesGroup by food_idOrder by count (food_id) DESC limit 10) top_foodsOn F. ID = top

SQLite database tutorial on Linux platform (1)-Terminal Use, linuxsqliteSQLite database tutorial on Linux platform (1)-terminal usage SQLiteIt is a lightweight database, designed to be embedded, and is currently used in many embedded products, it occupies very low resources, it may only take several hundred KB of memory. Supports mainstream operating systems such as Windows, Linux, and Unix, and can be comb

}); Db.close (); returnDellines; } //Change Public intUpdate (Student Student) {sqlitedatabase db=studentsqliteopenhelper.getreadabledatabase (); Contentvalues Values=Newcontentvalues (); Values.put ("Name", Student.name); Values.put ("Age", Student.age); Values.put ("School", Student.school); intresult = Db.update ("Student", values, "name =?",Newstring[]{student.name}); Db.close (); returnresult; } //Check PublicArraylistquery (String name) {Sqlitedatabase db=studen

Generally, the data source related control should have the unified management of the data module, which is also convenient for other forms to call; Usersessionunit is a ready-made data module. Now put the data source related controls on the Usersessionunit form: Fdphyssqlitedriverlink1:tfdphyssqlitedriverlink; Fdguixwaitcursor1:tfdguixwaitcursor; Fdconnection1:tfdconnection;datasource1:tdatasource; fdtable1:tfdtable; and write the code in its OnCreate event: Procedure Tiw