android sqlite 操作 说明 记录

不多说，直接上代码，在自己成为高手之前看看~~嘿嘿

1，建表操作

	db.execSQL("CREATE TABLE IF NOT EXISTS directions (dirTag STRING PRIMARY KEY, dirNameKey STRING, dirTitleKey STRING, dirRouteKey STRING)");
            db.execSQL("CREATE TABLE IF NOT EXISTS routes (route STRING PRIMARY KEY, color INTEGER, oppositecolor INTEGER, pathblob BLOB)");
            db.execSQL("CREATE TABLE IF NOT EXISTS stops (tag STRING PRIMARY KEY, lat FLOAT, lon FLOAT, title STRING)");
            db.execSQL("CREATE TABLE IF NOT EXISTS stopmapping (route STRING, tag STRING, dirTag STRING, PRIMARY KEY (route, tag))");
            db.execSQL("CREATE TABLE IF NOT EXISTS directionmapping (direction STRING, stop STRING, PRIMARY KEY(direction, stop))");
            db.execSQL("CREATE TABLE IF NOT EXISTS IDX_directionmapping on directionmapping (direction)");
            db.execSQL("CREATE INDEX IF NOT EXISTS IDX_routemapping ON stopmapping (route)");
            db.execSQL("CREATE INDEX IF NOT EXISTS IDX_stopmapping ON stopmapping (tag)");

2，重新建表

	db.execSQL("DROP TABLE IF EXISTS directions");
            db.execSQL("DROP TABLE IF EXISTS routes");
            db.execSQL("DROP TABLE IF EXISTS stops");
            db.execSQL("DROP TABLE IF EXISTS stopmapping");
            db.execSQL("DROP TABLE IF EXISTS directionmapping");
            onCreate(db);

3，插入数据

 private ContentValues values = null;

values.put("dirTag", direction.getDirTag());
            values.put("dirNameKey", direction.getDirNameKey());
            values.put("dirTitlekey", direction.getDirTitlekey());
            values.put("dirRouteKey", direction.getDirRouteKey());
            long id = db.insert("directions", null, values);

4，查询数据

 

	private static final String DEFAULT_CURRENT_ROUTE_TAG = "select tag from stopmapping where route=?";
    	private static final String[] DEFAULT_CURRENT_SELECTION = new String[]{"751"}; 
	Cursor c = db.rawQuery(querySQL, selection);

	Cursor cursor = db.rawQuery("select count(*) as count from routes",null);

//----------------由一条路线得到该路线上的方向--------------------------------------------------------
    public List<String> getDirection(String dirRouteKey){
    	directionList=new ArrayList<String>();
    	String selection="dirRouteKey="+dirRouteKey;
    	Cursor direction=db.query("directions",null, selection, null,null,null,null);
    	if(direction.moveToFirst()){
    		for(int i=0,num=direction.getCount();i<num;i++){
    			direction.moveToPosition(i);  
    			directionList.add(direction.getString(direction.getColumnIndex("dirTag")));
    		}
    	}

                direction.close();
                return directionList;
}