Databases
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POHow to open many database?
 

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  1. POHow to open many database?
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    <p>I've many BDD file. i want to open the first, extract data, and close, open the 2nd, extarct data, close, etc...</p> <p>I want do something like this in my Main. </p> <pre><code> LivresBDD livreBdd = new LivresBDD(this); // open the 1st BDD livreBdd.open(); Livre livreFromBdd = livreBdd.getLivreWithTitre(livre.getTitre()); //extract data livreBdd.close(); // open the 2nd BDD livreBdd.open(); Livre livreFromBdd = livreBdd.getLivreWithTitre(livre.getTitre()); //extract data livreBdd.close(); </code></pre> <p>LivreBDD.java:</p> <pre><code>public class LivresBDD { private static final int VERSION_BDD = 1; private static final String NOM_BDD = "eleves.db"; private static final String TABLE_LIVRES = "table_livres"; private static final String COL_ID = "ID"; private static final int NUM_COL_ID = 0; private static final String COL_ISBN = "ISBN"; private static final int NUM_COL_ISBN = 1; private static final String COL_TITRE = "Titre"; private static final int NUM_COL_TITRE = 2; private SQLiteDatabase bdd; private MaBaseSQLite maBaseSQLite; public LivresBDD(Context context){ //e //On créer la BDD et sa table maBaseSQLite = new MaBaseSQLite(context, NOM_BDD, null, VERSION_BDD); } public void open(){ //on ouvre la BDD en écriture bdd = maBaseSQLite.getWritableDatabase(); } public void close(){ //on ferme l'accès à la BDD bdd.close(); } public Livre getLivreWithTitre(String titre){ Cursor c = bdd.query(TABLE_LIVRES, new String[] {COL_ID, COL_ISBN, COL_TITRE}, COL_TITRE + " LIKE \"" + titre +"\"", null, null, null, null); return cursorToLivre(c); } //Cette méthode permet de convertir un cursor en un livre private Livre cursorToLivre(Cursor c){ //si aucun élément n'a été retourné dans la requête, on renvoie null if (c.getCount() == 0) return null; //Sinon on se place sur le premier élément c.moveToFirst(); //On créé un livre Livre livre = new Livre(); //on lui affecte toutes les infos grâce aux infos contenues dans le Cursor livre.setId(c.getInt(NUM_COL_ID)); livre.settype_t(c.getString(NUM_COL_TYPE_T)); livre.setnum_question(c.getString(NUM_COL_NUM_QUESTION)); livre.setquestion(c.getString(NUM_COL_QUESTION)); //On ferme le cursor c.close(); //On retourne le livre return livre; } } </code></pre> <p>It's the same BDD wich open a each time, but how can i specify the BDD name i want to open? Srry i'm newbee ;)</p> <p>Edit: I've done this:</p> <pre><code> LivresBDD livreBdd = new LivresBDD(this,BDD_NAME1); //Création d'une instance de ma classe LivresBDD livreBdd.open(); [...] livreBdd.close(); LivresBDD livreBdd = new LivresBDD(this,BDD_NAME2); //Création d'une instance de ma classe LivresBDD livreBdd.open(); [...] livreBdd.close(); </code></pre>
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