如何在sqlite中更新表？
问题描述：
我有两个表首先是TABLE_SUBJECT，第二个是TABLE_CHAPTER。现在我想要
添加一些列并删除之前的。我的问题是如何做到这一点。我尝试更新但是
它显示以前不是新的。我需要用新列删除先前和更新表。
我更改版本号但它不起作用。请给我提示或参考。
I have two table first is "TABLE_SUBJECT" and second is "TABLE_CHAPTER".Now i want to
add some column and delete previous. My question is that how to do that. i try to update but
it display previous not new. I need to delete previous and update table with new column.
I change version number but it not working. Please give me hint or reference.
这是我的一些SQLite代码：
Here is my some code of SQLite:
@Override
public void onCreate(SQLiteDatabase database) {
database.execSQL(DATABASE_CREATE);
database.execSQL(DATABASE_CREATE1);
}
@Override
public void onUpgrade(SQLiteDatabase database, int oldVersion, int newVersion) {
// TODO Auto-generated method stub
Log.w(MySQLiteHelper.class.getName(), "Upgrading database from version "
+ oldVersion + " to " + newVersion
+ ", which will destroy all old data");
database.execSQL("DROP TABLE IF EXISTS " + TABLE_SUBJECT);
database.execSQL("DROP TABLE IF EXISTS" + TABLE_CHAPTER);
onCreate(database);
}
答
你试试这段代码
public long update_todo_not(String a, String b, String c, String d,
String e, String f, String g, String id) {
ContentValues con = new ContentValues();
con.put("title", a);
con.put("description", b);
con.put("due_date", c);
con.put("alarm_time", d);
con.put("category", e);
con.put("alarm_set",f);
con.put("priority", g);
Log.v("priority", g+"");
return mDb.update(DATABASE_TABLE_TODO_LIST, con, "id ='" + id + "'",null);
}