android sqlite tutorial

Storage data (Medium)--sqlite syntax Introduction这篇文章学到的内容：1、sqlite数据存储The database used by Android is SQLite, which is presented here as an example of sqlite3.1 Sqlite3 supported data typesNULL INTEGER REAL TEXT 2 but in fact, Sqlite3 also accepts the following data types:smallint 16 位元的整数。 interger 32 位元的整数。 d

During the process of generating SQLite database files on the SD card in Android today, we found that A. DB-Journal file with the same name as the database file with a size of 0 is generated. I do not understand the purpose of this file, so Google's SQLite official documentation found that the file is used as follows: This file is a temporary log file of

Android pit-Free Guide (I) Sugar and SQLite, androidsqlite I recently used the ORM framework Sugar1.4 in Android mobile development, which saves a lot of code and also encountered a lot of trouble. The record is as follows:1. Use group by to convert query results to POJO objects In Sugar1.4, you can use the following code to convert the query result to a POJO obj

(int id );Public void updata (Person p );Public List Public Person findById (int id );} 3. DBOpenHelper. java Copy codeThe Code is as follows: package com. mrzhu. sqltite; Import android. content. Context;Import android. database. sqlite. SQLiteDatabase;Import android. database.

Sqlite is generally used in this way, that is, creating an empty database in the program, and then performing a series of operations such as adding, deleting, modifying, and querying, the development of small applications is easier to meet the requirements, but some large applications contain a large amount of data. If you insert data one by one in the program, first, it is time-consuming. Second, the user experience is poor. The most important thing

= Mconnection.createstatement (); CREATE TABLE State.executeupdate ("CREATE table TB1 (name varchar (), grade int);"); Insert Data state.executeupdate ("INSERT into TB1 values (' Name 1 ', 90);"); State.executeupdate ("INSERT into TB1 values (' Name 2 ', 58);"); State.executeupdate ("INSERT into TB1 values (' Name 3 ', 69);"); State.executeupdate ("INSERT into TB1 values (' Name 4 ', 85);"); Inserting data in the form of a parameter Prep

To manipulate the SQLite database on the Android real computer directly from the command line, you can do it directly through the ADB shell, but only if you have to get root privileges.In addition, the Android system is actually the Linux shell, this should be known, but under normal circumstances, in the/system/xbin/directory,There is no sqlite3 command, you nee

As a finished application, data storage operations are essential. As a result, the Android system offers four ways to store data. are: Sharepreference, SQLite, Content provider, and file. As the Android system, the data are basically private, are stored in the "data/data/package name" directory, so to achieve data sharing, the correct way is to use the content Pr

1.Sqlite IntroductionSQLite is a lightweight database, it is contained in a relatively small C library, it is designed to be embedded, because it occupies very little resources, it may only need hundreds of K of memory, and support Windows/linux/unix and so on the mainstream operating system, At the same time can be combined with a lot of programming languages, such as: c#/java/php, etc., so in the embedded device is particularly popular, which is pre

BoAndroidsqlite Database Initialization at startupMethod 1 has described a way to initialize a databaseIts database initialization is not a SQL statement, but a ready-made SQLite binary file for direct copy to the Android system's database path. On the one hand, I'm not so sure. Direct copy of this binary file, on the other hand, if the binary structure of the SQLite