NotesDbAdapter示例是针对一个表,多个表怎么样？

Question

我已经检查了NotesDbAdapter示例,我注意到这仅适用于单个表.(笔记)

1)我想知道如何为多个表做这个？例如,我现在有3个表.我如何处理这三个表中的所有升级,获取,删除？

2)我看到表列的已定义属性

public static final String KEY_TITLE = "title";
public static final String KEY_BODY = "body";
public static final String KEY_ROWID = "_id";

您如何定义多表情况的列？

Answer 1

对于我的应用程序,我创建了一个类来定义数据库:

public final class MyApplicationDb
{
    public static String DATABASE_NAME = "my_application_db";
    public static int DATABASE_VERSION = 1;

    public static final class Table1
    {
        public static String TABLE_NAME = "table1";
        public static String ID = "_id";
        public static String DAY = "day";
        public static String NAME = "name";
        public static String SOURCE = "source";
        public static String[] COLUMNS = { ID, DAY, NAME, SOURCE };
    }
    public static final class Table2
    {
        public static String TABLE_NAME = "table2";
        public static String ID = "_id";
        public static String CONTACT_ID = "contactId";
        public static String CONTACT_NAME = "contactName";
        public static String LAST_WISH_DATE = "lastWishDate";
        public static String[] COLUMNS = { ID, CONTACT_ID, CONTACT_NAME, LAST_WISH_DATE };
    }
}

和2个sql脚本,用于创建和更新数据库res/raw/db_create.sql和res/raw/db_update.sql

/* db_create.sql */
create table table1(
  _id integer primary key autoincrement,
  day char(5) not null,
  name varchar(64) not null,
  source varchar(64) not null);
create table table2(
  _id integer primary key autoincrement,
  contactId integer not null,
  contactName text not null,
  lastWishDate char(10) null);


/* db_update.sql */
DROP TABLE IF EXISTS table1;
DROP TABLE IF EXISTS table2

另一个用于创建/更新/访问数据库的类,NotesDbAdapter除了它使用sql脚本创建/更新数据库而不是常量之外.(看这里看看怎么做)