SQLite is a very popular embedded relational database, light load, fast, and open source. In Android, runtime provides SQLite, so we can use SQLite, and is the complete sqlite. SQLite provides a SQL interface, just like a normal d
The introductory guide to using the SQLite database in Android is intended to be shared with you in the following sections,
1, what is SQLite
2. Using SQLite in Android
One, what is SQLite
When data is inserted in SQLite, a default statement is a transaction, and disk operations are performed on every piece of data.
If you need to execute SQL statements frequently, you can enable transactions explicitly to improve efficiency.
Database. begintransaction (); // manually set the start transaction
// Data insertion operation cycle
Database. settransactionsuccessful (); // sets whether the transaction is successfully processed. If this
Preface SQLite is a lightweight small database, although relatively small, but the function is comparatively perfect, some common database basic functions also have, in the current embedded system to use the database is more, because it occupies very little system resources. Android system is no exception, but also the use of SQLite, this section of the study in
Li huaming himiOriginal, reprinted must be explicitly noted:Reprinted from[Heimi gamedev block]Link: http://www.himigame.com/android-game/329.html
Many kids shoes say that after my code is run, clicking home or back will cause a program exception. If you have encountered this, you certainly haven't carefully read the himi blog, in article 19th, himi specifically wrote about the causes and solutions of these errors. I have added my remarks on this blo
open, but when the Open fails, it will continue to try to read-only
Open the database. No error is reported.
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The following is an example of a listview with SQLite database as adapter (which can also be used as a Address Book tool)
As follows:
/* Main activity * @ Author: conowen * @ Date: 12.
You can only install the Android 3.2 API in the SDK manager of the old version. You must update the SDK Manager version before installing Android 4.0 and Android 4.1. The method is as follows:
Step 1: Open the SDK Manager
Step 2:
SQLite is a lightweight database designed for embedded devices. It has only five data types:
Null: NULL
Integer: integer
Real: Floating Point Number
Text: String
BLOB: Big Data
In SQLite, the Boolean and date types are not specifically designed, because the boolean type can replace true and false with integer 0 and 1, the date type can have text, real, and integer values in a specific format instead of disp
In this chapter, we are going to learn about the android database SQLite. We still take the previous chapter. For the migration of Tang Seng to westday, the three younger siblings have to kill monsters, so we have to make a summary, there is a count. Here we use SQLite to store the number of monsters killed by each hacker. OK, go to main. XML
Three buttons are
Today, let's summarize the application of SQLite database in Android system. First look at some of the database introduction:The SQLite database is an untyped database, which means that you can save any type of data to any column in any table, no matter what type the column is declared in when the table is create. Because SQL
Cause: After updating ADT and other support libraries in Sdksdk Manager, eclipse error: This Android SDK requires Android Developer Toolkit version 23.1 errors. But SDKSDK manager clearly shows that 23.1 of ADT is already installed, which is strange.Workaround: Help, Install New software, ADD->http://dl-ssl.google.com/
Solve the problem of This Android sdk requires Android Developer Toolkit version 23.1 After updating the file in SDK manager,
Cause: After the adt and its supporting libraries are updated in sdksdk manager, eclipse reports an error: This Android SDK requires
Cause: After updating ADT and its supporting libraries in Sdksdk Manager, eclipse error: This Android SDK requires Android Developer Toolkit version 23.1 errors. But SDKSDK manager clearly shows that 23.1 of ADT is already installed, which is strange.。Workaround: Help,Install New software, ADD->http://dl-ssl.google.com
Introduction to the use of SQLite for AndroidSQLitethe introductionThe built-in sqlite database in Android, what is the characteristic of SQLite ? SQLite is an open-source, embedded relational database that implements a self-contained, 0 configuration, transactional SQL data
It's disgusting, too, that Android studio is not used to having the latest version of Eclipse installed and then loading the ADT pluginNormal open Eclipse, new Android project, the last step to an ErrorJava.lang.NullPointerExceptionErrors running builder ' Android Resource Manager ' on Project ' XXX 'I see, the null po
Eclipse + ADT new Android project Errors running builder 'android Resource manager' solution, adtandroid
It is also disgusting. Android Studio is not used to it. It installs the latest version of Eclipse, and then installs the ADT plug-in.
Open Eclipse normally, create an andro
Android layout manager (table layout) and android Layout
Table layout is represented by TableLayout. TableLayout inherits LinearLayout, so its essence is still LinearLayout.
The table layout is managed in the form of rows and columns. You do not need to declare the number of rows and columns when using the table layout. Instead, you can add TableRow and other com
Android Learning Series (ii) layout manager: Linear layout, android linear Layout
Reprinted please indicate the source: http://blog.csdn.net/lhy_ycu/article/details/39643669
LinearLayout is a linear layout control in the Android control. Its child controls are arranged horizontally or vertically, arrange all child con
SQLite is a database product frequently used in software development on the Android platform. As a lightweight database, SQLite is designed to be embedded, moreover, it is already used in many embedded products, and its resource usage is very low. In embedded devices, it may only need several hundred KB of memory. Next, let's take a look at the use of
Android entry notes-data storage-SQLite, unit test
Why do we need to add three lightweight databases (SQLite) today? Because it is really light. Sqlite is a lightweight database specially prepared by unembedded devices. Although it is small, it has many functions. The biggest difference between it and other databases:
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