Thursday, January 12, 2012

Speed up SQLite insert

Using android.database.DatabaseUtils.InsertHelper class.

Sample code:

SQLiteDatabse db = getWriteableDatabase();
//use the db you would normally use for db.insert, and the "table_name"
//is the same one you would use in db.insert()
InsertHelper iHelp = new InsertHelper(db, "table_name");
//Get the indices you need to bind data to
//Similar to Cursor.getColumnIndex("col_name");                 
int first_index = iHelp.getColumnIndex("first");
int last_index = iHelp.getColumnIndex("last");

try{
   db.beginTransaction();
   for(int i=0 ; i<num_things ; ++i)
   {
       //need to tell the helper you are inserting (rather than replacing)
       iHelp.prepareForInsert();

       //do the equivalent of ContentValues.put("field","value") here
       iHelp.bind(first_index, thing_1);
       iHelp.bind(last_index, thing_2);

       //the db.insert() equilvalent
       iHelp.execute();
   }
   db.setTransactionSuccessful();
}
finally{
    db.endTransaction();
}
db.close();

Reference: http://stackoverflow.com/questions/3501516/android-sqlite-database-slow-insertion

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