android sqlite database tutorial

Experiment 8 SQLite Database operationsPurposeDesign a Personal Address book, master the development of the database under the Android platform, the personal Address Book mainly includes the contact list and contact details and other interfaces.RequirementsThe main interface of the program is the directory of contacts

AndroidWhen SQLite inserts the data by default a statement is a transaction, so if there are tens of thousands of data inserted, then you need to do tens of thousands of insertions, operation speed imaginable.　　So when inserting data into Android, using BULK insert can greatly improve the insertion speed. Sometimes need to put some data into the application, commonly used in the following 2 ways: One direct

Recently beginner Android, did the lab teacher to give the basic task, is simple login and registration, and can be realized through SQLite login, Sqllite is embedded in the Android deviceOkay, here's the main code:Establishment of the database:Here I just built a simple form for storing usernames and passwordsMydbhelper.java Public classMydbhelperextendsSqliteop

Division of PackagesThe Activity interface password is the same classCom.example.sqlite.activity Quick AccessDatabase Operation function Interface packageCom.example.sqlite.dao Quick AccessThe entity class is located in the packageCom.example.sqlite.domain Quick AccessTool PackCom.example.sqlite.heper Quick AccessInterface Implementation PackageCom.example.sqlite.operation Quick Entry TestLayout Quick EntryAndroid manifest file Configuration Quick Entry2015.1.8, fifth session operation of the

=NULL; LOG.E ("Searchphoto Exception", E.getmessage ()); E.printstacktrace (); } returncur; } //Edit photo Information Public intUpdateuserphoto (intPhotoID,intclassid,string title,string content, String tag) {Sqlitedatabase db=getwritabledatabase (); Contentvalues CV=Newcontentvalues (); Cv.put ("ClassId", classId); Cv.put ("Title", title); Cv.put ("Content", content); Cv.put ("Tag", tag); String[] args={string.valueof (photoid)}; returnDb.update (Mtuserphoto, CV, "photoi

Today, when I learned how to operate the SQLite database on Android, I wrote the following table: String tablecreate = "create table" + tablename + "(key_id integer primary key, key_name text, key_sex text )"; However, a normal cursor (cursor) can be returned during the query, but data cannot be output to the outside. I do not know why, later, it took only half

Android study notes (8) -- transactions in the Sqlite database, androidsqlite Transaction is the basic unit of concurrency control. A transaction is a sequence of operations. These operations are either executed or not executed. It is an inseparable unit of work. In a simple example, for example, bank transfers: either the two operations are executed or not execu

Android database SQLite writes SD card, androidsqlite If the mobile phone does not have a root user, the database files cannot be viewed and debugging is not convenient. The best way is to write the database into the SD card. There are two changes: 1. In your helper class,

/DEMO.DB"; Database name public static FINAL String table_name = "mytag";//datasheet name, a database can contain more than one datasheet, similar to the Sheet1,sheet2 in Excel // Mydbhelper's constructor, we are concerned with the name database_name and version versions public Mydbhelper { Super database_name, NULL, VERSION); Because if just a separate file name, the last created

In the previous contact project, you need to import the existing database contact.db after the app is installed to display the data stored in the database. This is also a face test, so how to achieve it?When you create a new raw folder in Res, the files in the Res\raw directory are not compressed so that you can directly extract the files in that directory. So how to import the

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);

. Field numberINNER JOIN table X on Member. Field number = table x. Field numberStatement 7. Add a small example here the nested SELECT statement, query results, as a table B, to query Select a. Product number, A. Initial quantity + B.numfrom Warehouse A, (select product number, SUM (quantity) as num from Danju GROUP by product number As b,where A. Product number =b. Product numberSummarizeThe connection query is the core of the SQL query, and the connection type of the connection query is

fields. Note:You must add a line footer. To insert data into a data table:Here, the information for Jack and rose two students is added separately.Querying data tables: A simple query: To set the display mode to list mode: Query in INSERT statement mode: Set the display mode to line mode (see Help for more modes): To change the delimiter: Add a field to the header (on is on, off to turn off the option): Replaces the null value of the output with th

The SQLite database is a built-in database of Android, small and powerful enough to work with most SQL statements, while SQLite databases are just files. Although SQLite is a bit much, but not as powerful as the PC-side MySQL, and

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 embed

system table Sqlite_masterString sql ="SELECT * from Sqlite_master"; cursor cursor = db.rawquery (SQL,NULL);//Print all column names of the tableLOG.I (TAG, Arrays.tostring (Cursor.getcolumnnames ()));//Print all tables in the current database if(Cursor.movetofirst ()) {do {String str =""; for(String item:cursor.getColumnNames ()) {str + + item +": "+ cursor.getstring (Cursor.getcolumnindex (item)) +"\ n"; } log.i (T

The example in this article describes how the Android operation SQLite the database under the Assets folder. Share to everyone for your reference. Specifically as follows: Because this project needs to bring data, so put the data into a SQLite database file, then put the fi

type; int id = cursor.getint (cursor.getcolumnindex ("id")) ; String named = cursor.getstring (Cursor.getcolumnindex ("name")); String number = cursor.getstring (Cursor.getcolumnindex ("number"));//Instantiate query result data Object person = new person (ID, named, number);} Close the database connection, release the Resource Db.close ();//Return the data result object return person; /** * Update a data according to name * * @param name * with new c

NewIllegalStateException ("Database not open"); + } A at //measurements Show Most SQL lengths -StringBuilder sql =NewStringBuilder (152); -Sql.append ("INSERT"); - sql.append (Conflict_values[conflictalgorithm]); -Sql.append ("into"); - sql.append (table); in //measurements Show most values lengths -StringBuilder values =NewStringBuilder (40); to +setNULL; - if(Initialvalues! =NULL initialvalues.size () >