我想用 SQLite 数据库中的数据填充我的 listView。但在填充之前,我必须创建数据库并用一些记录填充它。
我有一个 sql 文件,其中包含插入查询和要作为记录插入的相应值。
比如说,它包含查询,如 INSERT INTO 'tablename' (data1, data2) Values('1','2'),('3','4') 等。
所以我只需要在 SQLite DB 中执行相同的查询,并通过在 SQLite DB 表单中映射这个查询来在表中插入数据。对于多条记录插入,我在 ThemeTourActivity.java 中运行了以下查询,我想在其中显示 ListView:
INSERT INTO 'tablename' SELECT 'data1' AS 'col1', 'data2' AS 'col2'
UNION SELECT 'value1', 'value2'
UNION SELECT 'value3', 'value4'
and so on..
下面是我的 SQLiteOpenHelper 类:
public class ToursOpenHelper extends SQLiteOpenHelper{
public static final String DATABASE_NAME="WeTrip_DB";
public static final int DATABASE_VERSION=1;
//table's abstract implementations using BASECOLUMNS
public static abstract class tourEntry implements BaseColumns
{
public static final String TABLE="tour";
public static final String TOURTYPE="tour_type";
public static final String TOURNAME="tour_name";
public static final String NIGHTS="nights";
public static final String DAYS="days";
public static final String PIC="pic";
}
public static abstract class tourcatEntry implements BaseColumns
{
public static final String TABLE="tour_cat";
public static final String TOURCAT_DESC="tourcat_desc";
public static final String TOURCAT_NAME="tourcat_name";
public static final String TOURCAT_IMG="tourcat_img";
}
public static abstract class tourdestEntry implements BaseColumns
{
public static final String TABLE="tour_dest";
public static final String TOUR_ID="tour_id";
public static final String DEST_ID="dest_id";
}
public static abstract class destEntry implements BaseColumns
{
public static final String TABLE="destination";
public static final String DEST_NAME="dest_name";
}
//create DB TABLES
public static final String CREATE_TABLE_TOUR="CREATE TABLE "+tourEntry.TABLE +
"("
+ tourEntry._ID+" INTEGER PRIMARY KEY AUTOINCREMENT, "+
tourEntry.TOURTYPE + " INTEGER ," +
tourEntry.TOURNAME + " TEXT ," +
tourEntry.NIGHTS + " INTEGER ," +
tourEntry.DAYS + " INTEGER ,"+
tourEntry.PIC + " TEXT)";
public static final String CREATE_TABLE_TOURCAT="CREATE TABLE "+tourcatEntry.TABLE +
"("
+ tourcatEntry._ID+" INTEGER PRIMARY KEY AUTOINCREMENT , "+
tourcatEntry.TOURCAT_NAME + " TEXT ," +
tourcatEntry.TOURCAT_DESC + " TEXT ," +
tourcatEntry.TOURCAT_IMG + " TEXT)";
public static final String CREATE_TABLE_TOURDEST="CREATE TABLE "+tourdestEntry.TABLE +
"("
+ tourdestEntry._ID+" INTEGER PRIMARY KEY AUTOINCREMENT , "+
tourdestEntry.TOUR_ID + " INTEGER ," +
tourdestEntry.DEST_ID + " INTEGER)";
public static final String CREATE_TABLE_DEST="CREATE TABLE "+destEntry.TABLE +
"("
+ destEntry._ID+" INTEGER PRIMARY KEY AUTOINCREMENT , "+
destEntry.DEST_NAME + " TEXT)";
//DELETE DB TABLES
public static final String DELETE_TABLE_TOUR="DROP TABLE "+tourEntry.TABLE + " IF EXISTS ";
public static final String DELETE_TABLE_TOURCAT="DROP TABLE "+tourcatEntry.TABLE + " IF EXISTS ";
public static final String DELETE_TABLE_TOURDEST="DROP TABLE "+tourdestEntry.TABLE + " IF EXISTS ";
public static final String DELETE_TABLE_DEST="DROP TABLE "+destEntry.TABLE + " IF EXISTS ";
public ToursOpenHelper(Context context) {
super(context, DATABASE_NAME, null, DATABASE_VERSION);
// TODO Auto-generated constructor stub
}
@Override
public void onCreate(SQLiteDatabase db) {
// TODO Auto-generated method stub
db.execSQL(CREATE_TABLE_TOUR);
db.execSQL(CREATE_TABLE_TOURCAT);
db.execSQL(CREATE_TABLE_TOURDEST);
db.execSQL(CREATE_TABLE_DEST);
}
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
// TODO Auto-generated method stub
db.execSQL(DELETE_TABLE_TOUR);
db.execSQL(DELETE_TABLE_TOURCAT);
db.execSQL(DELETE_TABLE_TOURDEST);
db.execSQL(DELETE_TABLE_DEST);
}
}
下面是我的 ThemeToursActivity.java,其中必须从 DataBase 填充 listView :
package com.example.travelplanner;
import java.util.ArrayList;
import android.os.Bundle;
import android.app.Activity;
import android.database.sqlite.SQLiteDatabase;
import android.view.Menu;
import android.view.View;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.ListView;
public class ThemeTourActivity extends Activity implements OnItemClickListener {
//ArrayList<ThemeTourModel> tour_details = themeTourResults();
SQLiteDatabase db;
ToursOpenHelper helper;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_theme_tour);
final ListView tourList = (ListView)findViewById(R.id.theme_tour_listview);
tourList.setAdapter(new ThemeTourCustomAdapter(this,tour_details));
tourList.setOnItemClickListener(this);
helper = new ToursOpenHelper(this);
db = helper.getWritableDatabase();
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.theme_tour, menu);
return true;
}
@Override
public void onItemClick(AdapterView<?> arg0, View arg1, int arg2, long arg3) {
// TODO Auto-generated method stub
}
}
我很困惑如何实现这一目标。我只想创建一个数据库,在其中插入多条记录并检索数据并填充 listView。如果有人可以指导我完成这将是一个很大的帮助。在过去的几天里,我一直坚持下去。