android中的sqlit3数据库进行手机应用软件开发（自写的一个财务管理软件，这里主要讲收入录入模块）

1.设计好数据库的表结构，用android提供的SQLiteOpenHelper接口来实现数据库的创建

。。。。

public class DBOpenHelper extends SQLiteOpenHelper{

private static final int VERSION = 1;

private static final String DBNAME ="account.db";

public DBOpenHelper(Context context){ //定义构造函数

super(context,DBNAME,null,VERSION);
//重写基类的构造函数

}

@Override

public void onCreate(SQLiteDatabase db) {

// TODO 自动生成的方法存根

db.execSQL("create table tb_outacount(_id integer primary key,money decimal,time varchar(10),"+

"type varchar(10),address varchar(100),mark varchar(2000))");

db.execSQL("create table tb_inacount(_id integer primary key,money decimal,time varchar(10),"+

"type varchar(10),handler varchar(100),mark varchar(200))");

db.execSQL("create table tb_pwd(password varchar(20))");

db.execSQL("create table tb_flag(_id integer primary key,flag varchar(200))");

}

。。。。。。

2.根据tb_inacount 表结构（收入信息录入表），创建这个数据库表操作（增，删，改，查）公共类，写在****.***.DAO这个包下面

public class InacountDAO {

private DBOpenHelper helper;

private SQLiteDatabase db;

public InacountDAO(Context context){

helper = new DBOpenHelper(context);

}

/**

* 添加收入记录

*/

public void add(Tb_inacount tb_inacount){

db = helper.getWritableDatabase();

db.execSQL("insert into tb_inacount(_id,money,time,type,handler,mark) values (?,?,?,?,?,?)",

new Object[]{tb_inacount.get_id(),tb_inacount.getMoney(),tb_inacount.getTime(),tb_inacount.getType(),

tb_inacount.getHandle(),tb_inacount.getMark()});

}

/**

* 修改收入记录

* @param tb_inacount

*/

public void update(Tb_inacount tb_inacount){

db = helper.getWritableDatabase();

db.execSQL("update tb_inacount set money=?,time =?,type=?,handler=?,mark=? where _id=?",

new Object[]{tb_inacount.getMoney(),tb_inacount.getTime(),tb_inacount.getType(),

tb_inacount.getHandle(),tb_inacount.getMark(),tb_inacount.get_id()});

}

/**

* 返回结果集

* @param id

* @return

*/

public Tb_inacount find(int id){

db = helper.getWritableDatabase();

Cursor cursor = db.rawQuery("select * from tb_inacount where _id=?", new String[]{String.valueOf(id)});

if(cursor.moveToNext()){

return new Tb_inacount(cursor.getInt(cursor.getColumnIndex("_id")),cursor.getDouble(cursor.getColumnIndex("money")),

cursor.getString(cursor.getColumnIndex("time")),cursor.getString(cursor.getColumnIndex("type")),

cursor.getString(cursor.getColumnIndex("handler")),cursor.getString(cursor.getColumnIndex("mark")));

}else{

return null;

}

}

/**

* 删除一系列不选定的id

* @param ids

*/

public void delete(Integer... ids){

if(ids.length > 0){

StringBuffer sb = new StringBuffer();

for(int i=0;i<ids.length;i++){

sb.append('?').append(',');

}

sb.deleteCharAt(sb.length() - 1);

db = helper.getWritableDatabase();

db.execSQL("delete from tb_inacount where _id in("+sb+")",(Object[])ids);

}

}

/**

* 返回Cursor 对象 供ListView SimpleCursorAdapter使用

* @return

*/

public Cursor getInAllDataCursor(){

db = helper.getWritableDatabase();

return db.rawQuery("select * from tb_inacount", null);

}

/**

* 分页显示收入结果集

* @param start 开始的位置

* @param count 一页显示几条

* @return

*/

public List<Tb_inacount> getScrolData(int start,int count){

List<Tb_inacount> tb_inacount = new ArrayList<Tb_inacount>();

db = helper.getWritableDatabase();

Cursor cursor = db.rawQuery("select * from tb_inacount limit ?,?",

new String[]{String.valueOf(start),String.valueOf(count)});

while(cursor.moveToNext()){

tb_inacount.add(new Tb_inacount(cursor.getInt(cursor.getColumnIndex("_id")),cursor.getDouble(cursor.getColumnIndex("money")),

cursor.getString(cursor.getColumnIndex("time")),cursor.getString(cursor.getColumnIndex("type")),

cursor.getString(cursor.getColumnIndex("handler")),cursor.getString(cursor.getColumnIndex("mark"))));

}

return tb_inacount;

}

/**

* 返回当前结果集条数

* @return

*/

public long getCount(){

db = helper.getWritableDatabase();

Cursor cursor = db.rawQuery("select count(_id) from tb_inacount",null);

if(cursor.moveToNext()){

return cursor.getLong(0);

}else{

return 0;

}

}

/**

* 获取当前数据表中最大的ID

* @return

*/

public int getMaxId(){

db = helper.getWritableDatabase();

Cursor cursor = db.rawQuery("select max(_id) from tb_inacount", null);

if(cursor.moveToNext()){

return cursor.getInt(0);

}else{

return 0;

}

}

public Double getInSum(){

db = helper.getWritableDatabase();

Cursor cursor = db.rawQuery("select sum(money) from tb_inacount", null);

if(cursor.moveToNext()){

return cursor.getDouble(0);

}else{

return 0.0;

}

}

}

3. activity获取数据后，调用该方法对数据库进行操作

//数据库操申明对象

private Tb_inacount tb_inacount;

private InacountDAO inacountDAO;

// 为数据库操作申明对象

tb_inacount = new Tb_inacount(); //初始化

inacountDAO = new InacountDAO(AddinacountActivity.this);

获取数据并进行数据库操作

。。。。。

tb_inacount.set_id(inacountDAO.getMaxId()+1);

tb_inacount.setMoney(Double.parseDouble(money.getText().toString()));

tb_inacount.setTime(time.getText().toString());

tb_inacount.setType(type.getSelectedItem().toString());

tb_inacount.setHandle(handle.getText().toString());

tb_inacount.setMark(beizhu.getText().toString());

inacountDAO.add(tb_inacount);

new AlertDialog.Builder(AddinacountActivity.this).setTitle("系统信息")

.setMessage("增添收入成功,是否继续添加?")

.setPositiveButton("是", new DialogInterface.OnClickListener() {

@Override

public void onClick(DialogInterface arg0, int arg1) {

// TODO 自动生成的方法存根

money.setText("");

time.setText("");

handle.setText("");

beizhu.setText("");

type.setSelection(0);

return ;

}

}).setNegativeButton("否", new DialogInterface.OnClickListener() {

@Override

public void onClick(DialogInterface arg0, int arg1) {

// TODO 自动生成的方法存根

Intent intent = new Intent(AddinacountActivity.this,FunctionActivity.class);

startActivity(intent);

finish();

}

}).show();

。。。。。。。