原生SQLite数据存储简单使用

1.先创建一个SQLiteOpenHelper



2.调用sqliteopenhelper.getReadableDatabase()得到数据库



3.操作
insert



search



4.例子如下：//integer表示整形
//real表示浮点
//text表示文本
//blob表示二进制
public class MydatabaseHelper extends SQLiteOpenHelper {
private Context context;
public static String TABLE_SQL = "create table word (" +
"_id integer primary key autoincrement," +
"english text," +
"chinese text)";

public MydatabaseHelper(Context context, String name, SQLiteDatabase.CursorFactory factory, int version) {
super(context, name, null, version);
this.context = context;
Log.i("mydate" , "123456");
}

@Override
public void onCreate(SQLiteDatabase db) {
db.execSQL(TABLE_SQL);
Toast.makeText(context, "sqlite数据库创建成功", Toast.LENGTH_SHORT).show();
Log.i("mydate" , "123456onCreate");
}

@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
}
}

public class MainActivity extends AppCompatActivity {
Button alert;
MydatabaseHelper dbhelper;
SQLiteDatabase db;

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

dbhelper = new MydatabaseHelper(this , "DanCi.db" , null , 1);
alert = (Button) findViewById(R.id.alert);
alert.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Log.i("mydate" , "onclick");
dbhelper.getReadableDatabase(); //得到数据库操作类(.getWritableDatabase())
Log.i("mydate" , "onclick2222");
}
});

}

}