Android SQLite

<pre name="code" class="java">package com.jia.mdatabase;

import android.content.Context;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteDatabase.CursorFactory;
import android.database.sqlite.SQLiteOpenHelper;
import android.widget.Toast;

public class MyDatabaseHelper extends SQLiteOpenHelper {
	public static final String CREATE_BOOK = "create table book ("
			+ " id integer primary key autoincrement," + " author text,"
			+ " price real," + " pages integer," + " name text)";
	public static final String CREATE_CATEGORY = "create table Category("
			+ " id integer primary key autoincrement," + " category_name text,"
			+ " category_code integer)";
	private Context mContext;

	public MyDatabaseHelper(Context context, String name,
			CursorFactory factory, int version) {
		super(context, name, factory, version);
		mContext = context;
	}

	@Override
	public void onCreate(SQLiteDatabase db) {
		// TODO Auto-generated method stub
		db.execSQL(CREATE_BOOK);
		db.execSQL(CREATE_CATEGORY);
		Toast.makeText(mContext, "Create succeeded", Toast.LENGTH_LONG).show();
	}

	@Override
	public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
		db.execSQL("drop table if exists Book");
		db.execSQL("drop table if exists Category");
		onCreate(db);

	}

}

package com.jia.mdatabase;

import android.app.Activity;
import android.content.ContentValues;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.Toast;

public class MainActivity extends Activity {

	private MyDatabaseHelper dbHelper;

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
		dbHelper = new MyDatabaseHelper(this, "BookStore.db", null, 2);
		Button createDatabase = (Button) findViewById(R.id.create_database);
		createDatabase.setOnClickListener(new OnClickListener() {

			@Override
			public void onClick(View v) {
				dbHelper.getWritableDatabase();

			}
		});
		Button addData = (Button) findViewById(R.id.add_data);
		addData.setOnClickListener(new OnClickListener() {

			@Override
			public void onClick(View v) {
				SQLiteDatabase db = dbHelper.getWritableDatabase();
				ContentValues values = new ContentValues();
				// 开始组装第一条数据
				values.put("name", "The DaVinci Code");
				values.put("author", "Yao Jiawei");
				values.put("pages", 454);
				values.put("price", 16.96);
				db.insert("Book", null, values);// 插入第一条数据
				values.clear();
				// 开始组装第二条数据
				values.put("name", "The Lost Symbol");
				values.put("author", "Dan Brown");
				values.put("pages", 510);
				values.put("price", 19.95);
				db.insert("Book", null, values);// 插入第二天数据
			}
		});
		Button updateData = (Button) findViewById(R.id.update_data);
		updateData.setOnClickListener(new OnClickListener() {

			@Override
			public void onClick(View v) {
				SQLiteDatabase db = dbHelper.getWritableDatabase();
				ContentValues values = new ContentValues();
				values.put("price", 10.99);
				db.update("Book", values, "name=?",
						new String[] { "The DaVinci Code" });
				Toast.makeText(MainActivity.this, "更改成功", Toast.LENGTH_LONG)
						.show();
			}
		});
		Button deleteData = (Button) findViewById(R.id.delete_data);
		deleteData.setOnClickListener(new OnClickListener() {
			@Override
			public void onClick(View v) {
				SQLiteDatabase db = dbHelper.getWritableDatabase();
				db.delete("Book", "pages>?", new String[] { "500" });

			}
		});
		Button queryData = (Button) findViewById(R.id.query_data);
		queryData.setOnClickListener(new OnClickListener() {

			@Override
			public void onClick(View v) {
				SQLiteDatabase db = dbHelper.getWritableDatabase();
				Cursor cursor = db.query("Book", null, null, null, null, null,
						null);
				if (cursor.moveToFirst()) {
					do {
						// 遍历Cursor对象,取出数据并打印
						String name = cursor.getString(cursor
								.getColumnIndex("name"));
						String author = cursor.getString(cursor
								.getColumnIndex("author"));
						int pages = cursor.getInt(cursor
								.getColumnIndex("pages"));
						double price = cursor.getDouble(cursor
								.getColumnIndex("price"));
						Log.d("jia", "book name---->" + name);
						Log.d("jia", "book author---->" + author);
						Log.d("jia", "book pages---->" + pages);
						Log.d("jia", "book price---->" + price);
					} while (cursor.moveToNext());
				}
				cursor.close();
			}
		});
		Button replaceData = (Button) findViewById(R.id.replace_data);
		replaceData.setOnClickListener(new OnClickListener() {

			@Override
			public void onClick(View v) {
				SQLiteDatabase db = dbHelper.getWritableDatabase();
				db.beginTransaction();// 开启事物
				try {
					db.delete("Book", null, null);
					/*if (true) {
						// 在这里手动抛出一个异常,让事务失败
						throw new NullPointerException();
					}*/
					ContentValues values = new ContentValues();
					values.put("name", "Game of Thrones");
					values.put("author", "George Martin");
					values.put("pages", 720);
					values.put("price", 20.85);
					db.insert("Book", null, values);
					db.setTransactionSuccessful();// 事务已经执行成功
				} catch (Exception e) {
					// TODO Auto-generated catch block
					e.printStackTrace();
				} finally {
					db.endTransaction();// 结束事务
				}

			}
		});

	}

}

<pre name="code" class="java">
package org.crazyit.db;

import android.content.Context;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;


public class MyDatabaseHelper extends SQLiteOpenHelper
{
	final String CREATE_TABLE_SQL =
		"create table dict(_id integer primary " +
		"key autoincrement , word , detail)";
	public MyDatabaseHelper(Context context, String name, int version)
	{
		super(context, name, null, version);
	}
	@Override
	public void onCreate(SQLiteDatabase db)
	{
		// 第一次使用数据库时自动建表
		db.execSQL(CREATE_TABLE_SQL);
	}
	@Override
	public void onUpgrade(SQLiteDatabase db
		, int oldVersion, int newVersion)
	{
		System.out.println("--------onUpdate Called--------"
			+ oldVersion + "--->" + newVersion);
	}
}

package org.crazyit.db;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.Map;

import android.app.Activity;
import android.content.Intent;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;


public class Dict extends Activity
{
	MyDatabaseHelper dbHelper;
	Button insert = null;
	Button search = null;

	@Override
	public void onCreate(Bundle savedInstanceState)
	{
		super.onCreate(savedInstanceState);
		setContentView(R.layout.main);
		// 创建MyDatabaseHelper对象，指定数据库版本为1，此处使用相对路径即可，
		// 数据库文件自动会保存在程序的数据文件夹的databases目录下。
		dbHelper = new MyDatabaseHelper(this, "myDict.db3", 1);
		insert = (Button) findViewById(R.id.insert);
		search = (Button) findViewById(R.id.search);
		insert.setOnClickListener(new OnClickListener()
		{
			@Override
			public void onClick(View source)
			{
				// 获取用户输入
				String word = ((EditText) findViewById(R.id.word))
					.getText().toString();
				String detail = ((EditText) findViewById(R.id.detail))
					.getText().toString();
				// 插入生词记录
				insertData(dbHelper.getReadableDatabase(), word, detail);
				// 显示提示信息
				Toast.makeText(Dict.this, "添加生词成功！", 8000).show();
			}
		});

		search.setOnClickListener(new OnClickListener()
		{
			@Override
			public void onClick(View source)
			{
				// 获取用户输入
				String key = ((EditText) findViewById(R.id.key)).getText()
					.toString();
				// 执行查询
				Cursor cursor = dbHelper.getReadableDatabase().rawQuery(
					"select * from dict where word like ? or detail like ?",
					new String[] { "%" + key + "%", "%" + key + "%" });

				// 创建一个Bundle对象
				Bundle data = new Bundle();
				data.putSerializable("data", converCursorToList(cursor));
				// 创建一个Intent
				Intent intent = new Intent(Dict.this
					, ResultActivity.class);
				intent.putExtras(data);
				// 启动Activity
				startActivity(intent);
			}
		});
	}

	protected ArrayList<Map<String, String>>
		converCursorToList(Cursor cursor)
	{
		ArrayList<Map<String, String>> result = 
			new ArrayList<Map<String, String>>();
		// 遍历Cursor结果集
		while (cursor.moveToNext())
		{
			// 将结果集中的数据存入ArrayList中
			Map<String, String> map = new HashMap<String, String>();
			// 取出查询记录中第2列、第3列的值
			map.put("word", cursor.getString(1));
			map.put("detail", cursor.getString(2));
			result.add(map);
		}
		return result;
	}

	private void insertData(SQLiteDatabase db, String word
		, String detail)
	{
		// 执行插入语句
		db.execSQL("insert into dict values(null , ? , ?)"
			, new String[] {word, detail });
	}

	@Override
	public void onDestroy()
	{
		super.onDestroy();
		// 退出程序时关闭MyDatabaseHelper里的SQLiteDatabase
		if (dbHelper != null)
		{
			dbHelper.close();
		}
	}
}

/**
 *
 */
package org.crazyit.db;

import java.util.List;
import java.util.Map;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.widget.ListView;
import android.widget.SimpleAdapter;


public class ResultActivity extends Activity
{
	@Override
	public void onCreate(Bundle savedInstanceState)
	{
		super.onCreate(savedInstanceState);
		setContentView(R.layout.popup);
		ListView listView = (ListView) findViewById(R.id.show);
		Intent intent = getIntent();
		// 获取该intent所携带的数据
		Bundle data = intent.getExtras();
		// 从Bundle数据包中取出数据
		@SuppressWarnings("unchecked")
		List<Map<String, String>> list = (List<Map<String, String>>)
			data.getSerializable("data");
		// 将List封装成SimpleAdapter
		SimpleAdapter adapter = new SimpleAdapter(ResultActivity.this
			, list,
			R.layout.line, new String[] { "word", "detail" }
			, new int[] {R.id.word, R.id.detail });
		// 填充ListView
		listView.setAdapter(adapter);
	}
}

package org.crazyit.db;

import android.app.Activity;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteException;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.CursorAdapter;
import android.widget.EditText;
import android.widget.ListView;
import android.widget.SimpleCursorAdapter;


public class DBTest extends Activity
{
	SQLiteDatabase db;
	Button bn = null;
	ListView listView;

	@Override
	public void onCreate(Bundle savedInstanceState)
	{
		super.onCreate(savedInstanceState);
		setContentView(R.layout.main);
		// 创建或打开数据库（此处需要使用绝对路径）
		db = SQLiteDatabase.openOrCreateDatabase(
			this.getFilesDir().toString()
			+ "/my.db3", null); // ①
		listView = (ListView) findViewById(R.id.show);
		bn = (Button) findViewById(R.id.ok);
		bn.setOnClickListener(new OnClickListener()
		{
			@Override
			public void onClick(View source)
			{
				// 获取用户输入
				String title = ((EditText) findViewById(
					R.id.title)).getText().toString();
				String content = ((EditText) findViewById(R.id.content))
					.getText().toString();
				try
				{
					insertData(db, title, content);
					Cursor cursor = db.rawQuery("select * from news_inf"
						, null);
					inflateList(cursor);
				}
				catch (SQLiteException se)
				{
					// 执行DDL创建数据表
					db.execSQL("create table news_inf(_id integer"
						+ " primary key autoincrement,"
						+ " news_title varchar(50),"
						+ " news_content varchar(255))");
					// 执行insert语句插入数据
					insertData(db, title, content);
					// 执行查询
					Cursor cursor = db.rawQuery("select * from news_inf"
						, null);
					inflateList(cursor);
				}
			}
		});
	}

	private void insertData(SQLiteDatabase db
		, String title, String content) //②
	{
		// 执行插入语句
		db.execSQL("insert into news_inf values(null , ? , ?)"
			, new String[] {title, content });
	}

	private void inflateList(Cursor cursor)
	{
		// 填充SimpleCursorAdapter
		SimpleCursorAdapter adapter = new SimpleCursorAdapter(
			DBTest.this,
			R.layout.line, cursor,
			new String[] { "news_title", "news_content" }
			, new int[] {R.id.my_title, R.id.my_content },
			CursorAdapter.FLAG_REGISTER_CONTENT_OBSERVER); //③
		// 显示数据
		listView.setAdapter(adapter);
	}

	@Override
	public void onDestroy()
	{
		super.onDestroy();
		// 退出程序时关闭SQLiteDatabase
		if (db != null && db.isOpen())
		{
			db.close();
		}
	}
}