android開發的過程中，不可避免的有需要存儲數據的時候。

android的數據存取機制有很多，其中最重要的大概就是sqlite數據庫了

sqlite 數據庫是android自帶的數據庫。不需要任何別的插件。

sqlite的使用步驟大概有兩步

1.編寫SQLiteOpenHelper類

這個類用戶封裝數據庫表的建立、數據庫的獲得等操作

2.編寫TableManager類

這個類用戶封裝某個表的各種操作

1、SQLiteOpenHelper類

public class MySqliteOpenHelper extends SQLiteOpenHelper {public MySqliteOpenHelper(Context context, String name,CursorFactory factory, int version) {super(context, name, factory, version);// TODO Auto-generated constructor stub}@Overridepublic void onCreate(SQLiteDatabase arg0) {// TODO Auto-generated method stub//以下創建表的語句，執行括號中的sql語句，創建表。同一個數據庫中的所有表都在這里創建，arg0.execSQL("CREATE TABLE IF NOT EXISTS tb_Depot"+ "(id interger PRIMARY KEY,DepotSite varchar,DepotAcreage interger,DepotPrice interger,Linkman varchar,Phone varchar,Content varchar)");arg0.execSQL("CREATE TABLE IF NOT EXISTS tb_Freight"+ "(id interger PRIMARY KEY,start varchar,terminal varchar,FreightType varchar,FreightWeight int,linkman varchar,phone varchar, content varchar)");arg0.execSQL("CREATE TABLE IF NOT EXISTS tb_User"+ "(id interger PRIMARY KEY,UserName varchar,UserPass varchar,CompanyName varchar,address varchar,phone varchar,email varchar,permission varchar)");arg0.execSQL("CREATE TABLE IF NOT EXISTS tb_Chauffeur"+ "(id interger primary key,ChauffeurName varchar,trucktype varchar,tel varchar,effectdate varchar,content varchar)");arg0.execSQL("CREATE TABLE IF NOT EXISTS tb_Truck"+ "(id interger primary key,TruckNumber varchar,TruckWeight varchar,TruckPrice varchar,Start varchar,Whither varchar,linkman varchar,phone varchar)");}@Overridepublic void onUpgrade(SQLiteDatabase arg0, int arg1, int arg2) {// TODO Auto-generated method stub//如果需要用到更新數據庫的話，在這里進行操作}}

然后是封裝了數據庫表操作的manager類

public class DepotDBManager {private MySqliteOpenHelper helper ;private SQLiteDatabase db;public DepotDBManager(Context context){//實例化一個sqliteopenhelpr 類helper = new MySqliteOpenHelper(context,"depot.db",null,1);//獲得一個可讀寫的數據庫db = helper.getWritableDatabase();}public void add(DepotValue depotValue){//這是往表里增加數據的類,系統為我們封裝好了一套工具，我們可以不用再寫sql語句了ContentValues newValues = new ContentValues();newValues.put("Id", depotValue.getId());newValues.put("DepotSite", depotValue.getDepotSite());newValues.put("DepotAcreage", depotValue.getDepotAcreage());newValues.put("DepotPrice", depotValue.getDepotPrice());newValues.put("Linkman", depotValue.getLinkman());newValues.put("Phone", depotValue.getPhone());newValues.put("Content", depotValue.getContent());db.insert("tb_Depot",null, newValues);}public List<DepotValue> query(){//這是查詢操作 返回值是一個封裝了數據庫表信息的value類的鏈表ArrayList<DepotValue> depotvalues = new ArrayList<DepotValue>();Cursor c=queryTheCursor();while(c.moveToNext()){DepotValue depot = new DepotValue();depot.setId(c.getInt(c.getColumnIndex("id")));depot.setDepotSite(c.getString(c.getColumnIndex("DepotSite")));Log.i("chacuo","3332");depot.setDepotAcreage(c.getInt(c.getColumnIndex("DepotAcreage")));depot.setDepotPrice(c.getInt(c.getColumnIndex("DepotPrice")));depot.setLinkman(c.getString(c.getColumnIndex("Linkman")));depot.setPhone(c.getString(c.getColumnIndex("Phone")));depot.setContent(c.getString(c.getColumnIndex("Content")));depotvalues.add(depot);Log.i("hahaha",depot.getId()+depot.getContent());}c.close();return depotvalues;}public void deletebyid(int id){db.execSQL("delete from tb_Depot where id="+id);}public Cursor queryTheCursor(){Cursor c = db.rawQuery("select * from tb_Depot", null);return c;} } 《新程序員》：云原生和全面數字化實踐50位技術專家共同創作，文字、視頻、音頻交互閱讀

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