本文主要是写了一个android程序对sqlite3中数据库的employee表的插入、删除的操作,然后在cmd窗口中用sql命令查询employee表的操作过程.

1、第一步:首先把程序写好.

1.1、创建一个MainActivity类,代码如下:

package com.example.datastorege.action;

import com.example.datastorege.R;

import com.example.datastorege.R.layout;

import com.example.datastorege.R.menu;

import android.os.Bundle;

import android.app.Activity;

import android.view.Menu;

public class MainActivity extends Activity {

	@Override

	protected void onCreate(Bundle savedInstanceState) {

		super.onCreate(savedInstanceState);

		setContentView(R.layout.activity_main);

	}

	@Override

	public boolean onCreateOptionsMenu(Menu menu) {

		// Inflate the menu; this adds items to the action bar if it is present.

		getMenuInflater().inflate(R.menu.main, menu);

		return true;

	}

}

1.2、创建一个SQLiteOpenHelperImpl类,这个类是继承SQLiteOpenHelper类的,SQLiteOpenHelperImpl主要作用把创建的DB、DB的版本号通过SQLiteOpenHelper来实现,同时好在EmployeeDao获取db对象，以便操作sqlite3中的employee表.中代码如下:

package com.example.datastorege.dao;

import android.content.Context;

import android.database.sqlite.SQLiteDatabase;

import android.database.sqlite.SQLiteOpenHelper;

import android.util.Log;

public class SQLiteOpenHelperImpl extends SQLiteOpenHelper{

	private static final String TAG="EmployeeDaoJunit";

	private static final int DB_VERSION=1;

	private static final String DB_NAME="testDb.db";

	private static final String SQL_TABLE_NAME="create table employee(id INTEGER PRIMARY KEY,empName varchar(30),sex int);";

	public SQLiteOpenHelperImpl(Context context) {

		super(context, DB_NAME, null, DB_VERSION);

	}

	@Override

	public void onCreate(SQLiteDatabase db) {

		db.execSQL(SQL_TABLE_NAME);

		Log.i(TAG, "execSQL successful");

	}

	@Override

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

	}

}

1.3、创建操作sqlite3的dao类---EmployeeDao,这个类主要是操作sqlite3中testDb.db数据库名,代码如下:

package com.example.datastorege.dao;

import android.content.Context;

import android.database.Cursor;

import android.database.sqlite.SQLiteDatabase;

import com.example.datastorege.model.Employee;

public class EmployeeDao {

	private SQLiteOpenHelperImpl helper;

	private SQLiteDatabase db;

	public EmployeeDao(Context context){

		helper=new SQLiteOpenHelperImpl(context);

	}

	public void insert(Employee emp){

		db=helper.getWritableDatabase();

		db.execSQL("insert into employee values(?,?,?)", new Object[]{emp.getId(),emp.getEmpName(),emp.getSex()});

	}

	public void update(Employee emp){

		db=helper.getWritableDatabase();

		db.execSQL("update employee set empName=?,sex=? where id=?",new Object[]{emp.getEmpName(),emp.getSex(),emp.getId()});

	}

	public void delete(int id){

		db=helper.getWritableDatabase();

		db.execSQL("delete from employee where id=?", new Object[]{id});

	}

	public Employee queryBeanById(int id){

		Employee emp=null;

		db=helper.getWritableDatabase();

		Cursor cursor=db.rawQuery("",new String[]{});

		if(cursor.moveToNext()){

			emp=new Employee();

			emp.setEmpName(cursor.getString(cursor.getColumnIndex("empName")));

			emp.setSex(cursor.getInt(cursor.getColumnIndex("sex")));

			return emp;

		}

		return null;

	}

}

1.4、创建一个实体bean.

package com.example.datastorege.model;

public class Employee {

	private int id;

	private String empName;

	private int sex;

	public Employee(){};

	public Employee(int id,String empName,int sex){

		this.id=id;

		this.empName=empName;

		this.sex=sex;

	}

	public int getId() {

		return id;

	}

	public void setId(int id) {

		this.id = id;

	}

	public String getEmpName() {

		return empName;

	}

	public void setEmpName(String empName) {

		this.empName = empName;

	}

	public int getSex() {

		return sex;

	}

	public void setSex(int sex) {

		this.sex = sex;

	}

	@Override

	public String toString() {

		return this.id+"--"+this.empName+"--"+this.sex;

	}

}

1.5、创建一个android的junit测试类:

package com.example.datastorege;

import com.example.datastorege.dao.EmployeeDao;

import com.example.datastorege.model.Employee;

import android.test.AndroidTestCase;

import android.util.Log;

public class EmployeeDaoJunit extends AndroidTestCase{

	private static final String TAG="EmployeeDaoJunit";

	public void add(){

		EmployeeDao employeeDao=new EmployeeDao(this.getContext());

		employeeDao.insert(new Employee(2,"tangfq",1));

		Log.i(TAG, "EmployeeDao--->insert");

	}

	public void delete(){

		EmployeeDao employeeDao=new EmployeeDao(this.getContext());

		employeeDao.delete(1);

		Log.i(TAG, "EmployeeDao--->delete");

	}

}

以上就是要写的程序.查询和修改在测试类添加就行了.操作和新增、删除类似.

2、第二步:运行上面写的程序及操作sqlite3数据库.

2.1、运行EmployeeDaoJunit ,在运行它之前,要先运行sqlite3.exe,运行起后才执行EmployeeDaoJunit ,当junit运行绿色时,则证明写正确了.此时,在运行中输入"cmd"--->adb shell---->ls---->cd data---->cd data--->(在eclipse中打开DDMS Pespective,点击"File Explorer"查看,data--->data--->你的项目名包路径,如我的是com.example.datastorege)--->databases--->你的数据库名,我的数据库名为testDb.db--->sqlite3 testDb.db--->select id,empName,sex from employee;---->显示操作的employee表的结果.

操作的步骤是上面所描述的,如果有什么疑问或错误之处,敬请留言!谢谢了!