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Formatting Syntax

built_in:database

Table of Contents

Database

Description

Create or open a database using the OpenDatabase method of the app object:

//the database is called "MyData"  
db = app.OpenDatabase( "MyData" );

To save your database in a specific folder, use an absolute path. See GetDatabaseFolder

Methods

Method Description
Database.Close()
Database.Delete()
Database.ExecuteSql( sql, params, success, error )
Database.GetName()
Database.GetType()
Database.openError(e)
Database.openSuccess()

Example

(sample taken from the DroidScript sample section)

//Called when application is started.   
function OnStart()   
{   
    //Create a layout with objects vertically centered.   
    lay = app.CreateLayout( "linear", "VCenter,FillXY" );   
       
    //Create an 'Add' button.   
    btnAdd = app.CreateButton( "Add to Database", 0.6, 0.1 );   
    btnAdd.SetOnTouch( btnAdd_OnTouch );   
    lay.AddChild( btnAdd );   
       
    //Create a 'Remove' button.   
    btnRemove = app.CreateButton( "Remove from Database", 0.6, 0.1 );   
    btnRemove.SetOnTouch( btnRemove_OnTouch );   
    lay.AddChild( btnRemove );   
       
    //Create a 'Delete' button.   
    btnDelete = app.CreateButton( "Delete Database", 0.6, 0.1 );   
    btnDelete.SetOnTouch( btnDelete_OnTouch );   
    lay.AddChild( btnDelete );   
       
    //Create text box to show results.   
    txt = app.CreateText( "", 0.9, 0.4, "multiline" );   
    txt.SetMargins( 0,0.1,0,0 );   
    txt.SetBackColor( "#ff222222" );   
    txt.SetTextSize( 18 );   
    lay.AddChild( txt );   
       
    //Add layout to app.       
    app.AddLayout( lay );   
       
    //Create or open a database called "MyData".   
    db = app.OpenDatabase( "MyData" );   
       
    //Create a table (if it does not exist already).   
    db.ExecuteSql( "CREATE TABLE IF NOT EXISTS test_table " +   
        "(id integer primary key, data text, data_num integer)" );   
 
    //Get all the table rows.       
    DisplayAllRows();  
}   
 
//Called when user touches our 'Add' button.   
function btnAdd_OnTouch()   
{   
    //Add some data (with error handler).   
    db.ExecuteSql( "INSERT INTO test_table (data, data_num)" +    
        " VALUES (?,?)", ["test", 100], null, OnError );   
 
    //Get all the table rows.       
    DisplayAllRows();   
}   
 
//Called when user touches our 'Remove' button.   
function btnRemove_OnTouch()   
{       
    //Remove data.   
    db.ExecuteSql( "DELETE FROM test_table WHERE id > 3" );   
 
    //Get all the table rows.       
    DisplayAllRows();   
}   
 
//Called when user touches our 'Delete' button.   
function btnDelete_OnTouch()   
{       
   //Delete this database.   
   db.Delete();   
 
   //Get all the table rows.   
   DisplayAllRows();  
}   
 
//function to display all records  
function DisplayAllRows()  
{  
    txt.SetText("");   
       
    //Get all the table rows.   
    db.ExecuteSql( "select * from test_table;", [], OnResult );  
}  
 
//Callback to show query results in debug.   
function OnResult( results )    
{   
    var s = "";   
    var len = results.rows.length;   
    for(var i = 0; i < len; i++ )    
    {   
        var item = results.rows.item(i)   
        s += item.id + ", " + item.data + ", " + item.data_num + "\n";    
    }   
    txt.SetText( s );   
}   
 
//Callback to show errors.   
function OnError( msg )    
{   
    app.Alert( "Error: " + msg );   
    console.log( "Error: " + msg );   
}  
built_in/database.txt · Last modified: 2017/04/29 20:47 by administrator