SQLiteOpenHelper數據庫增刪改查和數據庫升級操作

public class DbHelper extends SQLiteOpenHelper {
    private Context context;
    public DbHelper(Context context){
        super(context,DbManager.DB_NAME,null,DbManager.DB_VERSION);

    }
    public DbHelper(Context context, String name, SQLiteDatabase.CursorFactory factory, int version) {
        super(context, name, factory, version);
    }

    @Override
    public void onCreate(SQLiteDatabase sqLiteDatabase) {
        // 創建數據庫
        String ct_stutent = "create table "+DbManager.StutentsTABLE.TABLE_NAME+"("+DbManager.StutentsTABLE.T_ID+" integer primary key autoincrement ,"+DbManager.StutentsTABLE.S_NAME+" varchar(255) ,"+DbManager.StutentsTABLE.S_WEIGHT+" varchar(255) ,"+DbManager.StutentsTABLE.S_HEIGHT+" varchar(255) ,"+DbManager.StutentsTABLE.S_GRADE+" varchar(255));";
        sqLiteDatabase.execSQL(ct_stutent);
    }

    @Override
    public void onUpgrade(SQLiteDatabase sqLiteDatabase, int i, int i1) {
        // 更新數據庫
        if (i1 > i && i1 == DbManager.DB_VERSION) {
            String s2 = "alter table "+ DbManager.StutentsTABLE.TABLE_NAME+" add " + DbManager.StutentsTABLE.S_IDADD +" varchar(255)";
            sqLiteDatabase.execSQL(s2);
        }

    }
}

public class DbManager {
    public static String DB_NAME = "nade";  // 數據庫名稱
    public static int DB_VERSION = 2;      // 數據庫版本
        // stutent 表相關
    public interface StutentsTABLE {
        String TABLE_NAME = "stutents";  // 表名稱

        String T_ID = "_id";
        String S_NAME = "name";
        String S_HEIGHT = "height";
        String S_WEIGHT = "weight";
        String S_GRADE = "grade";
        String S_IDADD = "idaddress";
    }
}



public class TableStutentEvent {

    private DbHelper dbHelper;


    public TableStutentEvent(Context context) {
        createSutent(context);
    }
    // 創建數據庫
    public void createSutent(Context context){
        if (dbHelper == null) {
            dbHelper = new DbHelper(context);
        }
    }
    // 關閉數據庫
    public void closeDb(){
        if (dbHelper != null) {
            dbHelper.close();
        }
    }
        // 批量插入
    public void insertList(List<Stutent> list){
        if (list == null) {
            return;
        }
        for (int i = 0; i < list.size(); i++) {
            insert(list.get(i));
        }
    }
    // 單一插入
    public void insert(Stutent stutent){
        if (stutent == null) {
            return;
        }
        if (dbHelper == null) {
            return;
        }
        SQLiteDatabase write = dbHelper.getWritableDatabase();
        ContentValues values = new ContentValues();
        values.put(DbManager.StutentsTABLE.S_NAME, TextUtils.isEmpty(stutent.getName()) ? "" : stutent.getName());
        values.put(DbManager.StutentsTABLE.S_HEIGHT, TextUtils.isEmpty(stutent.getHeight()) ? "" : stutent.getHeight());
        values.put(DbManager.StutentsTABLE.S_WEIGHT, TextUtils.isEmpty(stutent.getWeight()) ? "" : stutent.getWeight());
        values.put(DbManager.StutentsTABLE.S_GRADE, TextUtils.isEmpty(stutent.getGrade()) ? "" : stutent.getGrade());
        values.put(DbManager.StutentsTABLE.S_IDADD, TextUtils.isEmpty(stutent.getIdAddress()) ? "" : stutent.getIdAddress());
        write.insert(DbManager.StutentsTABLE.TABLE_NAME,null,values);
        write.close();
    }
        // 查詢
    public List<Stutent> query(){
        List<Stutent> list = new ArrayList<>();
        if (dbHelper != null) {
            SQLiteDatabase write = dbHelper.getWritableDatabase();
            Cursor cursor = write.query(DbManager.StutentsTABLE.TABLE_NAME, null, null, null, null, null,   "_id desc ");
            while (cursor.moveToNext()) {
                String name = cursor.getString(cursor.getColumnIndex(DbManager.StutentsTABLE.S_NAME));
                String weight = cursor.getString(cursor.getColumnIndex(DbManager.StutentsTABLE.S_WEIGHT));
                String height = cursor.getString(cursor.getColumnIndex(DbManager.StutentsTABLE.S_HEIGHT));
                String grade = cursor.getString(cursor.getColumnIndex(DbManager.StutentsTABLE.S_GRADE));
                String id = cursor.getString(cursor.getColumnIndex(DbManager.StutentsTABLE.T_ID));
                Stutent stutent = new Stutent();
                if (!TextUtils.isEmpty(cursor.getString(cursor.getColumnIndex(DbManager.StutentsTABLE.S_IDADD)))) {
                    String idadd = cursor.getString(cursor.getColumnIndex(DbManager.StutentsTABLE.S_IDADD));
                    stutent.setIdAddress(idadd);
                }
                stutent.setName(name);
                stutent.setWeight(weight);
                stutent.setHeight(height);
                stutent.setGrade(grade);
                stutent.setId(id);
                list.add(stutent);
            }
            write.close();
        }
        return list;
    }
        // 刪除
    public void delete(String id){
        if (dbHelper == null) {
            return;
        }
        if (TextUtils.isEmpty(id)) {
            return;
        }
        SQLiteDatabase write = dbHelper.getWritableDatabase();
        write.delete(DbManager.StutentsTABLE.TABLE_NAME,DbManager.StutentsTABLE.T_ID+"=?",new String[]{id});
        write.close();
    }
    // 批量刪除
    public void deleteList(List<String> list){
        if (dbHelper == null) {
            return;
        }
        if (list == null) {
            return;
        }
        SQLiteDatabase write = dbHelper.getWritableDatabase();
        write.delete(DbManager.StutentsTABLE.TABLE_NAME,DbManager.StutentsTABLE.T_ID+"=?", (String[]) list.toArray());
        write.close();
    }
        // 修改數據
    public void updata(String key,String value,String id){
        if (dbHelper == null) {
            return;
        }
        if (TextUtils.isEmpty(key)) {
            return;
        }
        if (TextUtils.isEmpty(id)) {
            return;
        }
        SQLiteDatabase write = dbHelper.getWritableDatabase();
        ContentValues values = new ContentValues();
        values.put(key,value);
        write.update(DbManager.StutentsTABLE.TABLE_NAME,values,DbManager.StutentsTABLE.T_ID+"=?",new String[]{id});
        write.close();
    }

        // 數據庫升級後 清除數據
    public void dbVersionUpDataClearData(){
        for (int i = 0; i < query().size(); i++) {
            if (TextUtils.isEmpty(query().get(i).getIdAddress())) {
                Log.d("nade", "onCreate: 刪除了不符合要求的數據="+query().get(i).toString()+"\n");
                delete(query().get(i).getId());
            }
        }
    }
}

       TableStutentEvent event = new TableStutentEvent(this);
        List<Stutent> list = new ArrayList<>();
        Stutent s1 = new Stutent();
        s1.setGrade("1");
        s1.setName("張三");
        s1.setHeight("181");
        s1.setWeight("51");
        s1.setIdAddress("北京市.紫禁城1號");
        list.add(s1);

        Stutent s2 = new Stutent();
        s2.setGrade("2");
        s2.setHeight("182");
        s2.setName("李四");
        s2.setWeight("52");
        s2.setIdAddress("北京市.紫禁城2號");
        event.insert(s2);
        Stutent s3 = new Stutent();
        s3.setGrade("3");
        s3.setName("王二");
        s3.setHeight("183");
        s3.setWeight("53");
        list.add(s3);
        Stutent s4 = new Stutent();
        s4.setGrade("4");
        s4.setName("麻子");
        s4.setHeight("184");
        s4.setWeight("54");
        list.add(s4);
        Stutent s5 = new Stutent();
        s5.setGrade("5");
        s5.setName("nade");
        s5.setHeight("185");
        s5.setWeight("55");
        list.add(s5);

        // event.insert(s1);


       // event.insertList(list);


        List<Stutent> query = event.query();
        for (int i = 0; i < query.size(); i++) {
            Log.d("nade", "onCreate: 添加後查詢所有數據="+query.get(i).toString()+"\n");
        }
        event.updata(DbManager.StutentsTABLE.S_NAME,"我是爸爸","1");
        List<Stutent> query1 = event.query();
        for (int i = 0; i < query1.size(); i++) {
            Log.d("nade", "onCreate: 更改後查詢搜友數據="+query1.get(i).toString()+"\n");
        }

        event.delete("2");
        List<Stutent> query2 = event.query();
        for (int i = 0; i < query2.size(); i++) {
            Log.d("nade", "onCreate: 刪除後查詢所有數據="+query2.get(i).toString()+"\n");
        }

        event.dbVersionUpDataClearData();

        List<Stutent> query3 = event.query();
        for (int i = 0; i < query3.size(); i++) {
            Log.d("nade", "onCreate: 數據庫升級後查詢所有數據="+query3.get(i).toString()+"\n");
        }
        event.insertList(list);
        List<Stutent> query4 = event.query();
        for (int i = 0; i < query4.size(); i++) {
            Log.d("nade", "onCreate: 數據庫升級後添加有效查詢所有數據="+query4.get(i).toString()+"\n");
        }
    }


public class Stutent {
    String id;
    String name;
    String weight;
    String height;
    String grade;
    String idAddress;
@Override
    public String toString() {
        return "Stutent{" +
                "id='" + id + '\'' +
                ", name='" + name + '\'' +
                ", weight='" + weight + '\'' +
                ", height='" + height + '\'' +
                ", grade='" + grade + '\'' +
                ", idAddress='" + idAddress + '\'' +
                '}';
    }
}