Jack_King007的专栏

1.安卓提供了SQLiteDatabase代表一个数据库，一单应用程序获得了代表数据库的SQLiteDATAbase对象，接下来就可以通过对象来管理操作数据库

实例一：

package com.xiaoxin.MobleSafe.dao;

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

public class BlackNumberDBOpenHelper extends SQLiteOpenHelper{


	/**
	 * 数据库创建的构造方法 数据库名称 blacknumber.db
	 * @param context
	 */
	public BlackNumberDBOpenHelper(Context context) {
		super(context,"blacknumber.db",null,1);
	}
	//初始化数据库的表结构
	@Override
	public void onCreate(SQLiteDatabase db) {
		db.execSQL("create table blacknumber (_id integer primary key autoincrement,number varchar(20),mode varchar(2))");
	}

	@Override
	public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
		
	}
	
}

2.同时创建一个业务bean方法进行集合接受数据

package com.xiaoxin.mobilesafe.domain;

/**
 * 黑名单号码的业务bean
 * @author Administrator
 *
 */
public class BlackNumberInfo {
	private String number;
	private String mode;
	public String getNumber() {
		return number;
	}
	public void setNumber(String number) {
		this.number = number;
	}
	public String getMode() {
		return mode;
	}
	public void setMode(String mode) {
		this.mode = mode;
	}
	@Override
	public String toString() {
		return "BlackNumberInfo [number=" + number + ", mode=" + mode + "]";
	}
	
}

3.进行SQL语句操作SQLite数据库

package com.itheima.mobilesafe.db.dao;

import java.util.ArrayList;
import java.util.List;

import android.content.ContentValues;
import android.content.Context;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;

import com.itheima.mobilesafe.db.BlackNumberDBOpenHelper;
import com.itheima.mobilesafe.domain.BlackNumberInfo;

/**
 * 黑名单数据库的增删改查业务类
 * @author Administrator
 *
 */
public class BlackNumberDao {
	private BlackNumberDBOpenHelper helper;
				/**
				 * 构造方法
				 * @param context 上下文
				 */
	public BlackNumberDao(Context context) {

<span style="white-space:pre">		</span>//将数据库传入
		helper = new BlackNumberDBOpenHelper(context);
	}
	/**
	 * 查询黑名单号码是是否存在
	 * @param number
	 * @return
	 */
	public boolean find(String number){
		boolean result = false;
		SQLiteDatabase db = helper.getReadableDatabase();
		Cursor cursor = db.rawQuery("select * from blacknumber where number=?", new String[]{number});
		if(cursor.moveToNext()){
			result = true;
		}
		cursor.close();
		db.close();
		return result;
	}
	/**
	 * 查询黑名单号码的拦截模式
	 * @param number
	 * @return 返回号码的拦截模式，不是黑名单号码返回null
	 */
	public String findMode(String number){
		String result = null;
		SQLiteDatabase db = helper.getReadableDatabase();
		Cursor cursor = db.rawQuery("select mode from blacknumber where number=?", new String[]{number});
		if(cursor.moveToNext()){
			result = cursor.getString(0);
		}
		cursor.close();
		db.close();
		return result;
	}
	/**
	 * 查询全部黑名单号码
	 * @return
	 */
	public List<BlackNumberInfo> findAll(){
		List<BlackNumberInfo> result = new ArrayList<BlackNumberInfo>();
		SQLiteDatabase db = helper.getReadableDatabase();
		Cursor cursor = db.rawQuery("select number,mode from blacknumber order by _id desc", null);
		while(cursor.moveToNext()){
			BlackNumberInfo info = new BlackNumberInfo();
			String number = cursor.getString(0);
			String mode = cursor.getString(1);
			info.setMode(mode);
			info.setNumber(number);
			result.add(info);
		}
		cursor.close();
		db.close();
		return result;
	}
	
	
	/**
	 * 添加黑名单号码
	 * @param number 黑名单号码
	 * @param mode 拦截模式 1.电话拦截 2.短信拦截 3.全部拦截
	 */
	public void add(String number,String mode){
		SQLiteDatabase db = helper.getWritableDatabase();
		ContentValues values = new ContentValues();
		values.put("number", number);
		values.put("mode", mode);
		db.insert("blacknumber", null, values);
		db.close();
	}
	/**
	 * 修改黑名单号码的拦截模式
	 * @param number 要修改的黑名单号码
	 * @param newmode 新的拦截模式
	 */
	public void update(String number,String newmode){
		SQLiteDatabase db = helper.getWritableDatabase();
		ContentValues values = new ContentValues();
		values.put("mode", newmode);
		db.update("blacknumber", values, "number=?", new String[]{number});
		db.close();
	}
	/**
	 * 删除黑名单号码
	 * @param number 要删除的黑名单号码
	 */
	public void delete(String number){
		SQLiteDatabase db = helper.getWritableDatabase();
		db.delete("blacknumber",  "number=?", new String[]{number});
		db.close();
	}
}

读入

SQLiteDatabase db = helper.getReadableDatabase();

写入

SQLiteDatabase db = helper.getWritableDatabase();