android sqlite multiple threads

BY clause:SELECT column1, Column2....columnnfrom table_namewhere Conditionorder by column_name {asc| DESC};SQLite PRAGMA Statement:PRAGMA Pragma_name; For Example:pragma Page_size; PRAGMA cache_size = 1024; PRAGMA Table_info (table_name);SQLite RELEASE savepoint Statement:RELEASE savepoint_name;SQLite REINDEX Statement:REINDEX collation_name; REINDEX Database

(Android.os.Message msg) {int code = Msg.what;switch (CO DE) {case 0:mphonebookehelper.insertcontacts (); break;}};}It is important to note that when you create a new thread in the activity, it is not directly accessible to the UI components in the activity, it needs to be handled with handler or Asyntask, and no one throws exception:Java.lang.RuntimeException:Can ' t create handler inside thread that have not called looper.prepare ()So I call the sendemptymessage () function in the button even

In Android development, non-UI threads cannot operate controls in the UI thread, that is, the UI is non-thread-safe. As I said in the previous article: It is non-UI secure, that is, it does not accept modification requests from non-UI threads. When we modify it through another thread (non-main thread or non-original thread, This exception will be thrown:

similar to tables in a database, that is, contentprovider is like a "Database ". The data provided by the outside world should be basically the same as the data obtained from the database, except that the URI is used to indicate the "Database" that the outside world needs to access ". As for how to identify which database is needed from the URI, this is what the android underlying layer needs to do. In brief analysis, contentprovider provides externa

functions, and the size of the dynamic library is quite small. IndependenceThe core engine of the SQLite database does not need to rely on third-party software or be "installed ". IsolationAll information (such as tables, views, and triggers) in the SQLite database is contained in a folder for convenient management and maintenance. Cross-platformSQLite currently supports most operating systems, not only co

Category: C #, Android, VS2015;Date Created: 2016-02-26 I. INTRODUCTIONAndroid contains three data access methods: SQLite database, file, sharedpreferences.In this chapter we mainly learn how to use SQLite database to access data.1, SQLite is a database of what gradeSQLite is a free, open-source database that has been

In Android development, SQLite is often used as a solution for local persistent storage. In ANDROIDSDK, has provided us with a variety of add, delete, change, check the API, although we can write our own SQL statement and then execute the Db.rawsql (sql,null) method, but there are some risks, that is, the stitching of the keyword may be illegal, This can cause a lot of unexpected and dangerous consequences.

Obtain data from the Internet and update the UI using sqlite in AndroidObtain data from the Internet and update the UI using sqlite in Android Here, I mainly want to create1. First retrieve data from the Internet2. Store the obtained data locally.3. The marker within the screen range is displayed on the map.4. When the MAP status changes, query the local database

----------------------Android training and Java training. We look forward to communicating with you! ---------------------- Java MultithreadingThe first way to create a thread: Inherit the Thread classSteps:1. Define class to inherit from thread2. Rewrite the run method in the Thread classObjective: To store custom code in the run method for threads to run.3. Call the start method of the thread. This method

position will be obtained. For example, the following SELECT statement returns 11th records starting from 100 records in table 2. select * From Table2 limit 10,100 6.4.5 transaction if multiple SQL statements with modification records (such as insert and update) are executed at a time, when an SQL statement fails to be executed, you need to cancel the modification of records by other SQL statements. Otherwise, data inconsistency may occur. Tr

As an Android preset database module, it is necessary to have a deep understanding of SQLite and find some optimization directions. Here, we have tested and analyzed the performance and memory of SQLite, compared the execution performance and memory usage of different operations, and roughly listed it here as a summary. 1. Basic Architecture First, let's take a