用谷歌封装好的API进行数据库增删查改（crud）

//sql语句增加一条记录
db.execSQL("insert into info(name,phone) values(?,?)",new Object[]{"小明","110"});

//API增加一条记录
ContentValues values = new ContentValues();
values.put("name","小明");
values.put("phone", "110");
long insert = db.insert("info", null, values);
if (insert > 0) {
Toast.makeText(getApplicationContext(), "插入成功", Toast.LENGTH_LONG).show();
} else {
Toast.makeText(getApplicationContext(),"插入失败",Toast.LENGTH_LONG).show();
}

//sql语句删除
db.execSQL("delete from info where name=?",new Object[]{"小明"});

//API删除
int delete = db.delete("info", "name=?", new String[]{"小明"});

Toast.makeText(MainActivity.this,"删除了"+delete+"行",Toast.LENGTH_LONG).show();

//sql语句更新
db.execSQL("update info set phone=? where name=?",new Object[]{"120","小明"});

//API更新
ContentValues values = new ContentValues();
values.put("phone", "120");
int updata = db.update("info", values, "name=?", new String[]{"小明"});
Toast.makeText(MainActivity.this, "更新了" + updata + "行", Toast.LENGTH_LONG).show();

//sql语句查询
Cursor cursor = db.rawQuery("select * from info", null);

//API查询
Cursor cursor = db.query("info", null, "name=?", new String[]{"小明"}, null, null, null);