SQLiteDatabaseTest
package com.hyz;
import android.app.Activity;
import android.content.ContentUris;
import android.content.ContentValues;
import android.content.Context;
import android.content.Intent;
import android.database.Cursor;
import android.os.Bundle;
import android.util.Log;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.BaseAdapter;
import android.widget.EditText;
import android.widget.ListView;
import android.widget.TextView;
import android.widget.Toast;
import android.widget.AdapterView.OnItemClickListener;
public class SQLiteDatabaseTest extends Activity implements OnItemClickListener
{
private Cursor cursor;
private EditText BookName;
private EditText Author;
private ListView bookslist;
private int BOOK_ID = 0;
protected final static int MENU_ADD=Menu.FIRST;
protected final static int MENU_DELETE=Menu.FIRST+1;
protected final static int MENU_UPDATE=Menu.FIRST+2;
protected final static int MENU_QUERY=Menu.FIRST+3;
private String bookname;
private String author;
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
Log.w("db", "SQLiteDatabaseTest-->onCreate()");
setContentView(R.layout.main);
BookName = (EditText)findViewById(R.id.bookname);
Author = (EditText)findViewById(R.id.author);
bookslist = (ListView)findViewById(R.id.bookslist);
queryAll();
}
@Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id)
{
Log.w("db", "SQLiteDatabaseTest-->onItemClick()");
cursor.moveToPosition(position);//移至第position行
BOOK_ID = cursor.getInt(0);//得到第0列
BookName.setText(cursor.getString(1));//得到第1列
Author.setText(cursor.getString(2));//得到第2列
}
@Override
public boolean onCreateOptionsMenu(Menu menu)
{
super.onCreateOptionsMenu(menu);
Log.w("db", "SQLiteDatabaseTest-->onCreateOptionsMenu()");
menu.add(Menu.NONE, MENU_ADD, 0, "ADD");
menu.add(Menu.NONE,MENU_DELETE,0,"DELETE");
menu.add(Menu.NONE, MENU_UPDATE, 0, "UPDATE");
menu.add(Menu.NONE, MENU_QUERY, 0, "QUERY");
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item)
{
super.onOptionsItemSelected(item);
Log.w("db", "SQLiteDatabaseTest-->onOptionsItemSelected()");
switch(item.getItemId())
{
case MENU_ADD:add();break;
case MENU_DELETE:delete();break;
case MENU_UPDATE:update();break;
case MENU_QUERY:query();break;
}
return true;
}
//初始化视图界面,将全部数据列出来
public void queryAll()
{
Log.w("db", "SQLiteDatabaseTest-->queryAll()");
cursor = getContentResolver().query(BooksDB.CONTENT_URI, null, null, null, null);
bookslist.setAdapter(new BookListAdapter(this,cursor));
bookslist.setOnItemClickListener(this);
}
//按姓名或作者关键字查询单个记录
public void query()
{
Log.w("db", "SQLiteDatabaseTest-->query()");
bookname = BookName.getText().toString();
author = Author.getText().toString();
if(bookname.equals("")&&author.equals(""))
{
queryAll();
}
else
{
cursor = getContentResolver().query(BooksDB.CONTENT_URI, null, BooksDB.BOOK_NAME + "=? or " + BooksDB.BOOK_AUTHOR + "=?", new String[]{bookname , author}, null);
bookslist.setAdapter(new BookListAdapter(this,cursor));
bookslist.setOnItemClickListener(this);
}
BookName.setText("");
Author.setText("");
Toast.makeText(this, "查找成功", Toast.LENGTH_LONG).show();
}
private void add()
{
Log.w("db", "SQLiteDatabaseTest-->add()");
bookname = BookName.getText().toString();
author = Author.getText().toString();
if(bookname.equals("")||author.equals(""))
{
return;
}
ContentValues values = new ContentValues(2);
values.put(BooksDB.BOOK_NAME, bookname);
values.put(BooksDB.BOOK_AUTHOR, author);
getContentResolver().insert(BooksDB.CONTENT_URI, values);
//下面几句可以在更改的同时更新list
//Log.w("db", ""+cursor.getPosition());cursor.getPosition()=插入数据位置-1
//cursor.moveToFirst();移至第一条记录，cursor.getPosition()=0
cursor.requery();
//Log.w("db", ""+cursor.getPosition());cursor.getPosition()=-1
//cursor.requery();和bookslist.invalidateViews();需要一起使用
bookslist.invalidateViews();
BookName.setText("");
Author.setText("");
Toast.makeText(this,"添加成功", Toast.LENGTH_LONG).show();
}
private void delete()
{
Log.w("db", "SQLiteDatabaseTest-->delete()");
if(BOOK_ID==0)
{
return;
}
getContentResolver().delete(ContentUris.withAppendedId(BooksDB.CONTENT_URI, BOOK_ID), null, null);
cursor.requery();
bookslist.invalidateViews();
BookName.setText("");
Author.setText("");
Toast.makeText(this,"删除成功", Toast.LENGTH_LONG).show();
}
private void update()
{
Log.w("db", "SQLiteDatabaseTest-->update()");
bookname = BookName.getText().toString();
author = Author.getText().toString();
ContentValues values = new ContentValues();
values.put(BooksDB.BOOK_NAME, bookname);
values.put(BooksDB.BOOK_AUTHOR, author);
if(bookname.equals("")||author.equals(""))
{
return;
}
getContentResolver().update(ContentUris.withAppendedId(BooksDB.CONTENT_URI, BOOK_ID), values, null, null);
cursor.requery();
bookslist.invalidateViews();//及时更新ListView里的内容，否则点击更新 内容不会变，其实内容在数据库中已经变了
BookName.setText("");
Author.setText("");
Toast.makeText(this, "更新成功", Toast.LENGTH_LONG).show();
}
public class BookListAdapter extends BaseAdapter
{
private Context mContext;
private Cursor mCursor;
public BookListAdapter(Context context, Cursor cursor)
{
Log.w("db", "SQLiteDatabaseTest-->BookListAdapter-->BookListAdapter()");
mContext = context;
mCursor = cursor;
}
@Override
public int getCount()
{
Log.w("db", "SQLiteDatabaseTest-->BookListAdapter-->getCount()");
Log.w("db", ""+mCursor.getCount());
return mCursor.getCount();
}
@Override
public Object getItem(int position)
{
Log.w("db", "SQLiteDatabaseTest-->BookListAdapter-->getItem()");
// TODO Auto-generated method stub
return null;
}
@Override
public long getItemId(int position)
{
// TODO Auto-generated method stub
Log.w("db", "SQLiteDatabaseTest-->BookListAdapter-->getItemId()");
return 0;
}
//position表示将显示的是第几行，covertView是从布局文 件中inflate来的布局。
@Override
public View getView(int position, View convertView, ViewGroup parent)
{
Log.w("db", "SQLiteDatabaseTest-->BookListAdapter-->getView()");
TextView mTextView = new TextView(mContext);
mCursor.moveToPosition(position);
mTextView.setText(mCursor.getString(1)+"____"+mCursor.getString(2));
return mTextView;
}
}
}
package com.hyz;
import android.content.ContentProvider;
import android.content.ContentUris;
import android.content.ContentValues;
import android.content.UriMatcher;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteQueryBuilder;
import android.net.Uri;
import android.util.Log;
public class MyProvider extends ContentProvider
{
private BooksDB mbooksDB;
private static final UriMatcher sMatcher;
private static final int BOOKS = 1;
private static final int BOOKS_ID = 2;
// 传入匹配码如果大于0表示匹配根路径或传入-1，即常量UriMatcher.NO_MATCH表示不匹配根路径
// addURI()方法是用来增加其他URI匹配路径的：
// 第一个参数代表传入标识ContentProvider的AUTHORITY字符串
// 第二个参数是要匹配的路径，#代表任意数字，另外还可以用*来匹配任意文本
// 第三个参数必须传入一个大于零的匹配码，用于match()方法对相匹配的URI返回相对应的匹配码
static
{
sMatcher = new UriMatcher(UriMatcher.NO_MATCH);
sMatcher.addURI("com.hyz", "books", BOOKS);
sMatcher.addURI("com.hyz", "books/#", BOOKS_ID);
}
/*
* 每当ContentProvider启动时都会回调onCreate()方法。
* 此方法主要执行一些ContentProvider初始化 的工作，返回true表示初始化成功，返回false则初始化失败。
*/
@Override
public boolean onCreate()
{
Log.w("db", "MyProvider-->onCreate()");
//项目首先调用此函数用来创建数据库
mbooksDB = new BooksDB(getContext());
return true;
}
/*
* * 该方法用于返回当前Url所代表数据的MIME类型
* 如果操作的数据属于集合类型，那么MIME类型字符串应该以vnd.android.cursor.dir/开头
* 例如：要得到所有person记录的Uri为content://org.wp.provider.personprovider/person
* 那么返回的MIME类型字符串应该为："vnd.android.cursor.dir/person"
* 如果要操作的数据属于单一数据，那么MIME类型字符串应该以vnd.android.cursor.item/开头
* 例如：得到id为10的person记录，Uri为content://org.wp.provider.personprovider/person/10
* 那么返回的MIME类型字符串应该为："vnd.android.cursor.item/person"
*
*/
@Override
public String getType(Uri uri)
{
Log.w("db", "MyProvider-->getType()");
switch (sMatcher.match(uri))
{
case 1:
return "vnd.android.cursor.dir/books";
case 2:
return "vnd.android.cursor.item/books";
default:
throw new IllegalArgumentException("Unknown URI " + uri);
}
}
/*
* 用于数据的删除，返回的是所影响数据的数目，首先利用数据库辅助对象获取一个SQLiteDatabase对象
* 然后根据传入Uri用sMatcher进行匹配，对单个数据或数据集进行删除或修改。notifyChange()方法
* 用来通知注册在次URI上的观察者（observer）数据发生了改变。
* */
@Override
public int delete(Uri uri, String selection, String[] selectionArgs)
{
Log.w("db", "MyProvider-->delete()");
SQLiteDatabase db = mbooksDB.getWritableDatabase();
int count;
switch(sMatcher.match(uri))
{
case BOOKS: count = db.delete(BooksDB.TABLE_NAME, selection, selectionArgs);
break;
case BOOKS_ID: count = db.delete(BooksDB.TABLE_NAME, BooksDB.BOOK_ID + "=?", new String[]{ContentUris.parseId(uri)+""});
break;
default:
throw new UnsupportedOperationException("Cannot update URL: ");
}
return count;
}
@Override
public Uri insert(Uri uri, ContentValues values)
{
Log.w("db", "MyProvider-->insert()");
//插入操作要对所有的字段插入，如果带有参数，则报异常
if (sMatcher.match(uri) != BOOKS)
{
throw new IllegalArgumentException("Cannot insert into URL: " + uri);
}
SQLiteDatabase db = mbooksDB.getWritableDatabase();
long rowId = db.insert(BooksDB.TABLE_NAME, null, values);
return ContentUris.withAppendedId(BooksDB.CONTENT_URI, rowId);
}
@Override
public Cursor query(Uri uri, String[] projection, String selection, String[] selectionArgs, String sortOrder)
{
SQLiteQueryBuilder qb = new SQLiteQueryBuilder();
int match = sMatcher.match(uri);
switch (match)
{
//1 、直接查询表中的所有数据
case BOOKS:
Log.w("db", "MyProvider-->query(1)");
qb.setTables("books_table");
break;
//2 、根据ID查询
case BOOKS_ID:
Log.w("db", "MyProvider-->query(2)");
qb.setTables(BooksDB.TABLE_NAME);
qb.appendWhere("book_id=");
//拿到uri后面的第一个参数并将它赋给数据库字段"_id";
qb.appendWhere(uri.getPathSegments().get(1));
break;
default:
throw new IllegalArgumentException("Unknown URL " + uri);
}
//3 、根据指定条件查询数据并返回cursor
SQLiteDatabase db = mbooksDB.getReadableDatabase();
Cursor ret = qb.query(db, projection, selection, selectionArgs, null, null, sortOrder);
return ret;
}
@Override
public int update(Uri uri, ContentValues values, String selection, String[] selectionArgs)
{
Log.w("db", "MyProvider-->update()");
SQLiteDatabase db = mbooksDB.getWritableDatabase();
int count ;
switch(sMatcher.match(uri))
{
case BOOKS: count = db.update(BooksDB.TABLE_NAME, values, selection , selectionArgs);
break;
case BOOKS_ID: count = db.update(BooksDB.TABLE_NAME, values , BooksDB.BOOK_ID + "=?",new String[]{ uri.getPathSegments().get(1)});
break;
default:
throw new UnsupportedOperationException("Cannot update URL: ");
}
return count;
}
}
package com.hyz;
import android.content.Context;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;
import android.net.Uri;
import android.util.Log;
public class BooksDB extends SQLiteOpenHelper
{
private final static String DATABASE_NAME = "books.db";
private final static int DATABASE_VERSION = 1;
public final static String TABLE_NAME = "books_table";
public final static String BOOK_ID = "book_id";
public final static String BOOK_NAME = "book_name";
public final static String BOOK_AUTHOR = "book_author";
public static final Uri CONTENT_URI = Uri.parse("content://com.hyz/books");
public BooksDB(Context context)
{
super(context, DATABASE_NAME, null, DATABASE_VERSION);
Log.w("db", "BooksDB-->BooksDB()");
}
/**
* 如果数据库文件不存在，只有oncreate()被调用（该方法在创建数据库时被调用一次）。
* 如果数据库文件存在，会调用onupdate()方法升级数据库，并更新版本号。
*/
@Override
public void onCreate(SQLiteDatabase db)
{
Log.w("db", "BooksDB-->onCreate()");
String sql = "create table "+TABLE_NAME+" ("+BOOK_ID+" INTEGER primary key autoincrement, "+BOOK_NAME+" text,"+BOOK_AUTHOR+" text);";
db.execSQL(sql);
}
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion)
{
Log.w("db", "BooksDB-->onUpgrade()");
String sql = "drop table if exists" + TABLE_NAME;
db.execSQL(sql);
onCreate(db);
}
}
main.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
>
<TextView
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="书名"
/>
<EditText
android:id="@+id/bookname"
android:layout_width="fill_parent"
android:layout_height="wrap_content"/>
<TextView
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="作者"
/>
<EditText
android:id="@+id/author"
android:layout_width="fill_parent"
android:layout_height="wrap_content"/>
<ListView
android:id="@+id/bookslist"
android:layout_width="fill_parent"
android:layout_height="wrap_content"/>
</LinearLayout>
AndroidManifest.xml
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.hyz"
android:versionCode="1"
android:versionName="1.0">
<application android:icon="@drawable/icon" android:label="@string/app_name">
<activity android:name=".SQLiteDatabaseTest"
android:label="@string/app_name">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<provider android:name="MyProvider" android:authorities="com.hyz" />
</application>
</manifest>