@Target(ElementType.TYPE)    //申明類
 
@Retention(RetentionPolicy.RUNTIME)
@Target(ElementType.FIELD)   //申明屬性

@DbTable("tb_student")
public class Student {
@DbField("_id")
private Integer id;
    private String age;
    private String sex;
    private String hight;

    public Student(String age, String sex, String hight) {
 
this.age = age;
        this.sex = sex;
        this.hight = hight;
    }
public String getAge() {
return age;
    }
public void setAge(String age) {
this.age = age;
    }
public String getSex() {
return sex;
    }
public void setSex(String sex) {
this.sex = sex;
    }
public String getHight() {
return 
 
hight;
    }
public void setHight(String hight) {
this.hight = hight;
    }
}

/**
 * 規範所有的資料庫操作
 */
public interface IBaseDao<T> {
/**
     * 插入資料
     * @param entity
* @return
*/
long insert(T entity);

    /**
     * 更新資料
     * @param entity
* @param where
* @return
*/
long update(T entity,T where);

    /**
     *刪除資料
     * @param where
* @return
*/
int delete(T where);

    /**
     * 查詢資料
     * @param where
* @return
*/
List<T> query(T where);
    List<T> query(T where,String orderBy,Integer startIndex,Integer limit);
    List<T> query(String sql);
}

/**
 * @author :created by ${yangpf}
 * 時間:2018/6/8 19
 * 郵箱：[email protected]
 * 建立資料庫表
 */
public class BaseDao<T> implements IBaseDao<T> {
/**
     * 持有資料庫操作的引用
     */
private SQLiteDatabase sqLiteDatabase;
    /**
     * 表名
     */
private String tableName;
    /**
     * 持有操作資料庫所對應的java型別
     */
private Class<T> entityClass;
    /**
     * 標識：用來表示是否做過初始化操作
     */
private boolean isInit=false;
    /**
     * 定義一個快取空間(key-欄位名    value-成員變數)
     */
private HashMap<String ,Field> cacheMap;


    /**
     *
     * @param sqLiteDatabase
* @param entityClass
* @return
*/
protected boolean init(SQLiteDatabase sqLiteDatabase, Class<T> entityClass) {
this.sqLiteDatabase = sqLiteDatabase;
        this.entityClass = entityClass;
        //可以根據傳入的entityClass型別來建立表,只需要建一次
if(!isInit){
//自動建表
            //取到表名
if(entityClass.getAnnotation(DbTable.class)==null){
//反射到類名
tableName=entityClass.getSimpleName();
            }else{
//取註解上的名字 tb_student
tableName=entityClass.getAnnotation(DbTable.class).value();
            }
if(!sqLiteDatabase.isOpen()){
return false;
            }
//執行建表操作
            //create table if not exists tb_student(_id integer,age varchar(20),sex varchar(20),hight varchar(20))
            //單獨用個方法來生成create命令
String createTableSql=getCreateTableSql();
            sqLiteDatabase.execSQL(createTableSql);
            cacheMap=new HashMap<>();
            initCacheMap();
            isInit=true;
        }
return isInit;
    }

public class BaseDaoFactory {
private static final BaseDaoFactory ourInstance = new BaseDaoFactory();

    public static BaseDaoFactory getOurInstance() {
return ourInstance;
    }
private SQLiteDatabase sqLiteDatabase;
    /**
     * 定義建立資料的路徑
     * 建議寫到SD卡中，好處，APP讓刪除了，下次再安裝的時候，資料還在
     */
private String sqliteDatabasePath;

    private BaseDaoFactory() {
//可以先判斷有沒有SD卡
sqliteDatabasePath = "data/data/com.retrofit.androidsqlliteutils/test.db";
        sqLiteDatabase = SQLiteDatabase.openOrCreateDatabase(sqliteDatabasePath, null);
    }
/**
     * 用來生產basedao物件
     */
public <T> BaseDao<T> getBaseDao(Class<T> entityClass) {
BaseDao baseDao = null;
        try {
baseDao = BaseDao.class.newInstance();
            baseDao.init(sqLiteDatabase, entityClass);
        } catch (InstantiationException e) {
e.printStackTrace();
        } catch (IllegalAccessException e) {
e.printStackTrace();
        }
return baseDao;
    }
}

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
    super.setContentView(R.layout.activity_main);

    initView();
}
@Override
public void onClick(View view) {
if (view.getId() == R.id.vt_insertData) {
BaseDao baseDao = BaseDaoFactory.getOurInstance().getBaseDao(Student.class);
        baseDao.insert(new Student("18", "男", "1.8米"));
    }
}
private void initView() {
vtInsertData = (TextView) findViewById(R.id.vt_insertData);
    vtInsertData.setOnClickListener(MainActivity.this);
    Toast.makeText(this,"新增成功",Toast.LENGTH_LONG).show();
}