在android 開發工程中，我們經常會把資料儲存到本地資料庫，然後進行增刪該查的操作，為了提高工作效率，近期我有空的時候稍微整理了一下，下面分享下

第一步首先定義下表中的列名，我們要建一個類 implements BaseColumns ,下面給出原始碼

/**
 * Created by duanhongbo on 2016/11/28.
 */
public  class LocationData implements BaseColumns{
        public static final String LOCATION_TABLE_NAME = "location"; // 表名
public static final 
 
String LOCATION_ID = "location_id";
        public final static String LONGITUDE = "longitude"; // varchar 20 not
public final static String LATITUDE = "latitude"; // varchar 20 not null
public final static String ELEVATION = "elevation";// varchar 20 not
public final static String GsmSignalStrength = "gsmSignalStrength"
 
;// 訊號強度
public final static String BatteryCount = "batteryCount";// 電量
public final static String GpsState = "gpsState";// gps開關
public final static String Time = "time";// 時間
public final static String UserId = "userid";// 使用者idisNetwork
public final static String isNetwork = "isNetwork";// 是否聯網
}

2  建一個數據庫管理類  繼承SQLiteOpenHelper，下面給出程式碼

/**
 * Created by duanhongbo on 2016/11/28.
 */
public class DatabaseHelper extends SQLiteOpenHelper {
    private static final String DATABASE_NAME = "transition.db";
    private static final int DATABASE_VERSION = 1;
    private Context context;
    private static SQLiteDatabase mDb;
    public synchronized SQLiteDatabase getInstence() {

        if (null == mDb || (mDb != null && !mDb.isOpen())) {
            mDb = getReadableDatabase();
//       mDb = getWritableDatabase();
}
        return mDb;
}

    public static synchronized void closeDB() {
        if (null != mDb && mDb.isOpen()) {
            mDb.close();
}
    }

    public DatabaseHelper(Context context) {
        super(context, DATABASE_NAME, null, DATABASE_VERSION);
// TODO Auto-generated constructor stub
this.context = context;
}
    @Override
public void onCreate(SQLiteDatabase arg0) {
        // TODO Auto-generated method stub
mDb = arg0;
/*
       * 定位表
       */
mDb.execSQL("CREATE TABLE IF NOT EXISTS "
+ LocationData.LOCATION_TABLE_NAME + "( " + LocationData.LOCATION_ID
+ " INTEGER PRIMARY KEY AUTOINCREMENT NOT NULL  , "
+ LocationData.LONGITUDE + " DOUBLE , " + LocationData.LATITUDE
+ " DOUBLE , " + LocationData.ELEVATION + " DOUBLE , "
+ LocationData.Time + " TEXT ," + LocationData.UserId + " TEXT ," + LocationData.GsmSignalStrength + " INTEGER , " + LocationData.BatteryCount + " INTEGER , " + LocationData.GpsState + " INTEGER ," + LocationData.isNetwork +" INTEGER );");
Log.i("dhb","success" + " -->  SUCCESS  ");
}
    @Override
public void onUpgrade(SQLiteDatabase arg0, int arg1, int arg2) {
        // TODO Auto-generated method stub
}

}

/**
 * Created by duanhongbo on 2016/11/28.
 */
public class LocationDao {
    private DatabaseHelper dbHelper;
/**
     *
     */
public LocationDao(Context context) {
        // TODO Auto-generated constructor stub
this.dbHelper = new DatabaseHelper(context);
}

    /*
     * 插入某個使用者的資料
     */
public int insertInfo(Loaction l) {

        int success = 0;
        boolean flag = false;
/*String sql = "SELECT  MAX(" + LocationData.Location.LOCATION_ID + ") from "
                + LocationData.Location.LOCATION_TABLE_NAME;*/
Cursor cursor = null;
SQLiteDatabase db = dbHelper.getInstence();
db.beginTransaction();//
try {
            ContentValues contentValues = new ContentValues();
contentValues.put("elevation", l.getAltitude());//海拔
contentValues.put("latitude", l.getLatitude());//緯度
contentValues.put("longitude", l.getLongitude());//經度
contentValues.put("gsmSignalStrength", l.getGsmSignalStrength());//訊號強度
contentValues.put("batteryCount", l.getBatteryCount());//電量
contentValues.put("gpsState", l.getGpsState() + "");//gps狀態
contentValues.put("userid", l.getUserId());//使用者id
contentValues.put("time", l.getTime());//定位時間
contentValues.put("isNetwork", l.getIsNetwork());//是否聯網
long ok = db.insert(LocationData.LOCATION_TABLE_NAME, null,
contentValues);
            if (0 < ok) {
                flag = true;
} else {
                flag = false;
}
            db.setTransactionSuccessful();
} catch (Exception e) {
            // TODO: handle exception
} finally {
            db.endTransaction();
// db.close();
}
        return success;
}

    /**
     * 刪表某個使用者的所有資料
     */
public boolean delTable(String userId) {
        boolean isOk = false;
SQLiteDatabase db = dbHelper.getInstence();
db.beginTransaction();//
try {
            int res = db.delete(LocationData.LOCATION_TABLE_NAME,
LocationData.UserId + "=?", new String[]{userId});
            if (res > 0) {
                isOk = true;
}
            db.setTransactionSuccessful();
} catch (Exception e) {
            e.printStackTrace();
} finally {
            db.endTransaction();
}
        return isOk;
}

    /**
     * 查詢某個使用者的所有資料
     *
     * @param userId
* @return
*/
public List<Loaction> getAllLocation(int userId) {
        List<Loaction> allLoaction = new ArrayList<>();
Loaction l = null;
SQLiteDatabase db = dbHelper.getInstence();
db.beginTransaction();//
Cursor cursor = null;
String sql = "select * from " + LocationData.LOCATION_TABLE_NAME
+ " where " + LocationData.UserId + " = " + userId;
        try {
            cursor = db.rawQuery(sql, null);
            while (cursor.moveToNext()) {
                l = new Loaction();
String longtitude = cursor.getString(1);//經度
String latitude = cursor.getString(2);//緯度
String elevation = cursor.getString(3);//海拔
String time = cursor.getString(4);//時間
int userid = cursor.getInt(5);//使用者id
int gsmSignalStrength = cursor.getInt(6);//訊號強度
int batteryCount = cursor.getInt(7);//電量
int gpsState = cursor.getInt(8);//gps狀態
int isNetwork= cursor.getInt(9);//是否聯網
//............................................................................
l.setAltitude(Double.parseDouble(elevation));//海拔
l.setLongitude(Double.parseDouble(longtitude));//經度
l.setLatitude(Double.parseDouble(latitude));//緯度
l.setTime(time);//時間
l.setBatteryCount(batteryCount);//電量
l.setGsmSignalStrength(gsmSignalStrength);//強度
l.setUserId(userid);//使用者id
l.setGpsState(gpsState);
l.setIsNetwork(isNetwork);
allLoaction.add(l);
}
        } catch (Exception e) {
            // TODO Auto-generated catch block
e.printStackTrace();
} finally {
            db.endTransaction();
}
        return allLoaction;
}

}