SQlite-数据库的访问实例（转）

1、DBAdapter类： 1 package com.cnzcom.android.quickdial;import android.content.ContentValues;import android.content.Context; import android.database.Cursor; import android.database.SQLException; import android.database.sqlite.SQLiteDatabase; import android.database.sqlite.SQLiteOpenHelper; import android.util.Log;/*** * @author zhangjie** 数据库相关操作的类*/ public class DBAdapter {/*** 数据库名*/private static final String DATABASE_NAME = "quickdial.db";/*** 数据表名*/private static final String DATABASE_TABLE = "quickdial";/*** 数据库版本*/private static final int DATABASE_VERSION = 1;/*** key_id ：主键*/@SuppressWarnings("unused")private static final String KEY_ID = "key_id";/*** position ：位置信息，表示数据是第几项*/private static final String POSITION = "position";/*** name ：姓名*/private static final String NAME = "name";/*** phone_number ：电话号码*/private static final String PHONE_NUMBER = "phone_number";/*** ip ：是否ip播出*/private static final String IP = "ip";/*** */private static final String DATABASE_CREATE ="create table quickdial (key_id INTEGER PRIMARY KEY, "+ "position INTEGER, " + "name TEXT, " + "phone_number TEXT, "+ "ip INTEGER"+ ");";/*** */private final Context context;/*** */private DatabaseHelper DBHelper;/*** */private SQLiteDatabase db;public DBAdapter(Context ctx) {context = ctx;DBHelper = new DatabaseHelper(context);}private static class DatabaseHelper extends SQLiteOpenHelper {public DatabaseHelper(Context context) {super(context, DATABASE_NAME, null, DATABASE_VERSION);}@Overridepublic void onCreate(SQLiteDatabase db) {// TODO Auto-generated method stub db.execSQL(DATABASE_CREATE);}@Overridepublic void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {// TODO Auto-generated method stubdb.execSQL("DROP TABLE IF EXISTS " + DATABASE_TABLE);onCreate(db);}}/*** 打开数据库* @return* @throws SQLException*/public SQLiteDatabase open() throws SQLException{db = DBHelper.getWritableDatabase();Cursor cursor = getAll();if(cursor.getCount() == 0) {Log.e("数据库为空", "插入数据");/*** 先使用假数据初始化数据库*/for(int i = 0; i < 10; i++) {insert(i, "", "", 0);} } else {Log.e("数据库不为空", "读取数据");}cursor.close();return db;}/*** 关闭数据库*/public void close(){DBHelper.close();}/*** 向数据库中插入数据*/public long insert(int position, String name, String phone_number, int ip) {ContentValues initialValues = new ContentValues();initialValues.put(POSITION, position);initialValues.put(NAME, name);initialValues.put(PHONE_NUMBER, phone_number);initialValues.put(IP, ip);return db.insert(DATABASE_TABLE, null, initialValues);}/*** 删除数据,其实不是真正意义上的删除，而是将name = ""、phone_number = ""、ip = 0*/public boolean delete(int position) {ContentValues initialValues = new ContentValues();initialValues.put(POSITION, position);initialValues.put(NAME, "");initialValues.put(PHONE_NUMBER, "");initialValues.put(IP, 0);return db.update(DATABASE_TABLE, initialValues, POSITION + "=" + position, null) > 0; // return db.delete(DATABASE_TABLE, POSITION + "=" + position, null) > 0; }/*** 更改数据*/public boolean update(int position, String name, String phone_number, int ip) {ContentValues initialValues = new ContentValues();//initialValues.put(POSITION, position); initialValues.put(NAME, name);initialValues.put(PHONE_NUMBER, phone_number);initialValues.put(IP, ip);return db.update(DATABASE_TABLE, initialValues, POSITION + "=" + position, null) > 0; }public Cursor getAll() {Cursor cur = db.query(DATABASE_TABLE, null, null, null, null, null, null);return cur; }public Cursor get(long rowId) throws SQLException {Cursor cur = db.query(true, DATABASE_TABLE, new String[] {POSITION,NAME,PHONE_NUMBER,IP}, POSITION + "=" + rowId, null, null, null, null, null);if(cur != null) {cur.moveToFirst();}return cur;}}2、Activity中调用：1 public DBAdapter m_DBAdapter;m_DBAdapter = new DBAdapter(this); m_DBAdapter.open();

文章出处

http://www.cnblogs.com/Jackeyzhang/archive/2011/06/02/2068459.html

转载于:https://www.cnblogs.com/zhangshuli-1989/p/zhangshuli_SQlite_150302183.html

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