如何存储和连接sqlite数据库？

-4

我正在开发Android项目。它就像一个测验。我提供多选答案的问题，所以如果答案错误，用户只能选择一个答案将转到一个简单的youtube视频或只会给出链接。所以问题是：sqlite数据库是完美的吗？以及我将如何存储它们？并将其与应用程序连接？我看到了一些代码，但没有提到活动代码。我不擅长与Android开发，所以我有点困惑， PLZ帮助我。一个月后我的项目的最后期限。在此先感谢。如何存储和连接sqlite数据库？

来源

2015-03-25 user3604741

检查这个使用数据库 - http://www.tutorialspoint.com/android/ android_sqlite_database.htm – 2015-03-25 12:39:51

可能的重复[如何将我的SQLite数据库连接到我的android应用程序？]（http://stackoverflow.com/questions/14494263/how-do-i-connect-my-sqlite-database-to-我-Android的应用程序） – LittleBobbyTables 2015-03-25 12:43:12

首先，肥大创建dbhelper类

import android.content.Context; 
import android.database.sqlite.SQLiteDatabase; 
import android.database.sqlite.SQLiteOpenHelper; 

public class DbHelper extends SQLiteOpenHelper { 

private final static String DB_NAME = "miacassa.db"; 
private final static int DB_VERSION = 4; 

public DbHelper(Context context) { 
    super(context, DB_NAME, null, DB_VERSION); 
} 

@Override 
public void onCreate(SQLiteDatabase db) { 
    db.execSQL(EntrateTableHelper.CREATE_QUERY); 
    db.execSQL(UsciteTableHelper.CREATE_QUERY); 

} 
@Override 
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) { 
    db.execSQL("DROP TABLE " + EntrateTableHelper.TABLE_NAME); 
    db.execSQL(EntrateTableHelper.CREATE_QUERY); 
    db.execSQL("DROP TABLE " + UsciteTableHelper.TABLE_NAME); 
    db.execSQL(UsciteTableHelper.CREATE_QUERY); 

    } 

}

比，你肥大创建tablehelper为您的每个表

import android.provider.BaseColumns; 

public class EntrateTableHelper implements BaseColumns { 

public static final String TABLE_NAME = "entrate"; 
public static final String ENTRATA = "entrata"; 
public static final String DATA = "data"; 
public static final String DESCRIZIONE = "descrizione"; 
public static final String ORA = "ora"; 

public static String CREATE_QUERY = "CREATE TABLE " + TABLE_NAME + " (" 
     + _ID + " INTEGER PRIMARY KEY AUTOINCREMENT, " + ENTRATA 
     + " TEXT NOT NULL, " + DATA 
     + " TEXT NOT NULL, "+ DESCRIZIONE 
     + " TEXT NOT NULL, "+ ORA 
     + " TEXT NOT NULL "+ ");"; 
} 


import android.provider.BaseColumns; 

public class UsciteTableHelper implements BaseColumns { 

public static final String TABLE_NAME = "uscite"; 
public static final String USCITE = "uscite"; 
public static final String DATA = "data"; 
public static final String DESCRIZIONE = "descrizione"; 
public static final String ORA = "ora"; 

public static String CREATE_QUERY = "CREATE TABLE " + TABLE_NAME + " (" 
     + _ID + " INTEGER PRIMARY KEY AUTOINCREMENT, " + USCITE 
     + " TEXT NOT NULL, " + DATA 
     + " TEXT NOT NULL, "+ DESCRIZIONE 
     + " TEXT NOT NULL, "+ ORA 
     + " TEXT NOT NULL "+ ");"; 
}

比你肥大创建YOUT内容提供商

import android.content.ContentProvider; 
import android.content.ContentResolver; 
import android.content.ContentValues; 
import android.content.UriMatcher; 
import android.database.Cursor; 
import android.database.sqlite.SQLiteDatabase; 
import android.database.sqlite.SQLiteQueryBuilder; 
import android.net.Uri; 
import com.giurgica.manageerasmusmoney.database.EntrateTableHelper; 
import com.giurgica.manageerasmusmoney.database.UsciteTableHelper;;

公共类MyContentProvider扩展ContentProvider的{

public static final String AUTHORITY = "com.giurgica.manageerasmusmoney.database"; 

public static final String ENTRATE_PATH = "entrate"; 
public static final String USCITE_PATH = "uscite"; 

public static final Uri ENTRATE_URI = Uri.parse(ContentResolver.SCHEME_CONTENT + "://" + AUTHORITY + "/" + ENTRATE_PATH); 
public static final Uri USCITE_URI = Uri.parse(ContentResolver.SCHEME_CONTENT + "://" + AUTHORITY + "/" + USCITE_PATH); 



private static final int FULL_ENTRATE_TABLE = 0; 
private static final int SINGLE_ENTRATE = 100; 
private static final int FULL_USCITE_TABLE = 1; 
private static final int SINGLE_USCITA = 101; 


private static final UriMatcher URI_MATCHER = new UriMatcher(UriMatcher.NO_MATCH); 

static{ 
    URI_MATCHER.addURI(AUTHORITY, ENTRATE_PATH, FULL_ENTRATE_TABLE); 
    URI_MATCHER.addURI(AUTHORITY, ENTRATE_PATH + "/#", SINGLE_ENTRATE); 
    URI_MATCHER.addURI(AUTHORITY, USCITE_PATH, FULL_USCITE_TABLE); 
    URI_MATCHER.addURI(AUTHORITY, USCITE_PATH + "/#", SINGLE_USCITA); 
} 

private DbHelper helper; 

@Override 
public boolean onCreate() { 

    helper = new DbHelper(getContext()); 
    return true; 
} 

@Override 
public int delete(Uri uri, String selection, String[] selectionArgs) { 

    SQLiteDatabase database = helper.getWritableDatabase(); 
    int result = 0; 
    String tmp; 
    switch (URI_MATCHER.match(uri)) { 
    case FULL_ENTRATE_TABLE: 
     result = database.delete(EntrateTableHelper.TABLE_NAME, selection, 
       selectionArgs); 
     break; 
    case SINGLE_ENTRATE: 
     tmp = EntrateTableHelper._ID + " = " 
       + uri.getLastPathSegment(); 
     result = database.delete(EntrateTableHelper.TABLE_NAME, 
       selection + "AND" + tmp, selectionArgs); 
     break; 
    case FULL_USCITE_TABLE: 
     result = database.delete(UsciteTableHelper.TABLE_NAME, selection, 
       selectionArgs); 
     break; 
    case SINGLE_USCITA: 
     tmp = UsciteTableHelper._ID + " = " 
       + uri.getLastPathSegment(); 
     result = database.delete(UsciteTableHelper.TABLE_NAME, 
       selection + "AND" + tmp, selectionArgs); 
     break; 
    default: 
     break; 
    } 

    if (result != 0) 
     getContext().getContentResolver().notifyChange(uri, null); 

    return result; 
} 

public static final String MIME_TYPE_SFALCI = ContentResolver.CURSOR_DIR_BASE_TYPE 
     + "/sfalci"; 

public static final String MIME_TYPE_SFALCIO = ContentResolver.CURSOR_ITEM_BASE_TYPE 
     + "/sfalcio"; 

@Override 
public String getType(Uri uri) { 

    switch (URI_MATCHER.match(uri)) { 
    case FULL_ENTRATE_TABLE: 
     return MIME_TYPE_SFALCI; 

    case SINGLE_ENTRATE: 
     return MIME_TYPE_SFALCIO; 

    default: 
     break; 
    } 

    return null; 
} 

@Override 
public Uri insert(Uri uri, ContentValues values) { 

    if (URI_MATCHER.match(uri) == FULL_ENTRATE_TABLE) { 
     SQLiteDatabase database = helper.getWritableDatabase(); 
     long result = database.insert(EntrateTableHelper.TABLE_NAME, null, 
       values); 

     getContext().getContentResolver().notifyChange(uri, null); 

     return Uri.parse(ENTRATE_URI + "/" + result); 

    } 
    if (URI_MATCHER.match(uri) == FULL_USCITE_TABLE) { 
     SQLiteDatabase database = helper.getWritableDatabase(); 
     long result = database.insert(UsciteTableHelper.TABLE_NAME, null, 
       values); 

     getContext().getContentResolver().notifyChange(uri, null); 

     return Uri.parse(USCITE_URI + "/" + result); 

    } 
    return null; 
} 



@Override 
public Cursor query(Uri uri, String[] projection, String selection, 
     String[] selectionArgs, String sortOrder) { 
    SQLiteQueryBuilder queryBuilder = new SQLiteQueryBuilder(); 

    switch (URI_MATCHER.match(uri)) { 
     case FULL_ENTRATE_TABLE: 
      queryBuilder.setTables(EntrateTableHelper.TABLE_NAME); 
      break; 
     case SINGLE_ENTRATE: 
      queryBuilder.setTables(EntrateTableHelper.TABLE_NAME); 
      queryBuilder.appendWhere(EntrateTableHelper._ID + "=" 
        + uri.getLastPathSegment()); 
      break; 
     case FULL_USCITE_TABLE: 
      queryBuilder.setTables(UsciteTableHelper.TABLE_NAME); 
      break; 
     case SINGLE_USCITA: 
      queryBuilder.setTables(UsciteTableHelper.TABLE_NAME); 
      queryBuilder.appendWhere(UsciteTableHelper._ID + "=" 
        + uri.getLastPathSegment()); 
      break; 
     default: 
      break; 
    } 
    SQLiteDatabase vdDatabase = helper.getReadableDatabase(); 

    Cursor cursor = queryBuilder.query(vdDatabase, projection, selection, 
      selectionArgs, null, null, "_ID DESC"); 

    cursor.setNotificationUri(getContext().getContentResolver(), ENTRATE_URI); 

    return cursor; 
} 

@Override 
public int update(Uri uri, ContentValues values, String selection, 
     String[] selectionArgs) { 

    SQLiteDatabase database = helper.getWritableDatabase(); 
    int result = 0; 
    String tmp; 

    switch (URI_MATCHER.match(uri)) { 
    case FULL_ENTRATE_TABLE: 
     result = database.update(EntrateTableHelper.TABLE_NAME, values, 
       selection, selectionArgs); 

     break; 
    case SINGLE_ENTRATE: 
     tmp = EntrateTableHelper._ID + " = " + uri.getLastPathSegment(); 
     result = database.update(EntrateTableHelper.TABLE_NAME, values, 
       selection + "AND" + tmp, selectionArgs); 

     break; 
    case FULL_USCITE_TABLE: 
     result = database.update(UsciteTableHelper.TABLE_NAME, values, 
       selection, selectionArgs); 

     break; 
    case SINGLE_USCITA: 
     tmp = UsciteTableHelper._ID + " = " + uri.getLastPathSegment(); 
     result = database.update(UsciteTableHelper.TABLE_NAME, values, 
       selection + "AND" + tmp, selectionArgs); 
     break; 
    default: 
     break; 
    } 

    if(result!=0) 
     getContext().getContentResolver().notifyChange(uri, null); 

    return result; 
} 

}

，并在结束时，你CON在活动

private SQLiteDatabase database; 
DbHelper helper = new DbHelper(this); 
database = helper.getWritableDatabase(); 
Cursor cursor = database.query(EntrateTableHelper.TABLE_NAME, new String[] { 
      EntrateTableHelper.ENTRATA}, null, null, 
      null, null, null); 

    int entrate = cursor.getColumnIndex(EntrateTableHelper.ENTRATA); 
String soldi; 
while(cursor.moveToNext()){ 
     soldi = cursor.getString(entrate); 


    } 

    cursor.close();

来源

2015-03-25 12:51:25

如何存储和连接sqlite数据库？

回答

相关问题