哪位大仙帮忙写一个 Android 连接SQLite数据库的简单示例 由于初学android 还望详细一点
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发布时间：2022-04-09 15:59
共2个回答
热心网友
时间：2022-04-09 17:28
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
//打开或创建test.db数据库
SQLiteDatabase db = openOrCreateDatabase("test.db", Context.MODE_PRIVATE, null);
db.execSQL("DROP TABLE IF EXISTS person");
//创建person表
db.execSQL("CREATE TABLE person (_id INTEGER PRIMARY KEY AUTOINCREMENT, name VARCHAR, age SMALLINT)");
Person person = new Person();
person.name = "john";
person.age = 30;
//插入数据
db.execSQL("INSERT INTO person VALUES (NULL, ?, ?)", new Object[]{person.name, person.age});
person.name = "david";
person.age = 33;
//ContentValues以键值对的形式存放数据
ContentValues cv = new ContentValues();
cv.put("name", person.name);
cv.put("age", person.age);
//插入ContentValues中的数据
db.insert("person", null, cv);
cv = new ContentValues();
cv.put("age", 35);
//更新数据
db.update("person", cv, "name = ?", new String[]{"john"});
Cursor c = db.rawQuery("SELECT * FROM person WHERE age >= ?", new String[]{"33"});
while (c.moveToNext()) {
int _id = c.getInt(c.getColumnIndex("_id"));
String name = c.getString(c.getColumnIndex("name"));
int age = c.getInt(c.getColumnIndex("age"));
Log.i("db", "_id=>" + _id + ", name=>" + name + ", age=>" + age);
}
c.close();
//删除数据
db.delete("person", "age < ?", new String[]{"35"});
//关闭当前数据库
db.close();
//删除test.db数据库
//deleteDatabase("test.db");
}
热心网友
时间：2022-04-09 18:46
