无废话Android 系列教程33 [Adroid下SQLite数据库增删改查&测试]

今天是中秋节，心情不太好，于是乎写会代码吧.

1 建立一个新包com.andy.db.dao, 

2. 建立类PersonDao.java

package com.andy.db.dao;

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

import com.andy.db.PersonSQLiteOpenHelper;
import com.andy.db.domain.Person;

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

public class PersonDao {
	private PersonSQLiteOpenHelper helper;
	public PersonDao(Context context){
		helper = new PersonSQLiteOpenHelper(context);
	}
	
	/*
	 * 插入用户名和手机号到SQLite数据库
	 */
	public void addPerson(String name, String number){
		
		//此时就获取到了数据库
		SQLiteDatabase db = helper.getWritableDatabase();
		db.execSQL("insert into person (name,number) values (?,?)", new Object[]{name,number});
		db.close();
	}
	
	/**
	 * 删除一条数据，按用户名的条件
	 * @param name
	 */
	public void deletePerson(String name){
		SQLiteDatabase db = helper.getWritableDatabase();
		db.execSQL("delete from person where name =?", new Object[]{name});
		db.close();
	}
	
	
	/**
	 * 修改一条数据,按用户名的条件
	 * @param name
	 * @param number
	 */
	public void updatePerson(String name, String number){
		SQLiteDatabase db = helper.getWritableDatabase();
		db.execSQL("update person set number = ? where name = ?", new Object[]{name,number} );
		db.close();
	}
	
	/**
	 * 查询一条数据,按用户名的条件
	 * @param name
	 * @param number
	 */
	public boolean findPerson(String name){
		SQLiteDatabase db = helper.getWritableDatabase();
		Cursor cursor = db.rawQuery("select * from person where name=?", new String[]{name});
		boolean result = cursor.moveToNext();
		cursor.close();
		db.close();
		return result;
	}
	
	
	public List<Person> findAllPerson(){
		SQLiteDatabase db = helper.getWritableDatabase();
		Cursor cursor = db.rawQuery("select * from person", null);
		List<Person> persons = new ArrayList<Person>(); 
		Person person;
		while(cursor.moveToNext()){
			int id = cursor.getInt(cursor.getColumnIndex("id"));
			String name = cursor.getString(cursor.getColumnIndex("name"));
			String number = cursor.getString(cursor.getColumnIndex("number"));
			person = new Person(id,name,number);
			persons.add(person);
		}
		cursor.close();
		db.close();
		return persons;
	}

}

3.  建立一个新包com.andy.db.domain

4. 在其下面创建一个新类Person.java

package com.andy.db.domain;

public class Person {
	private int id;
	private String name;
	private String number;
	
	public Person(int id, String name, String number){
		this.id = id;
		this.name= name;
		this.number = number;
	}
	
	@Override
	public String toString() {
		return "Person [id=" + id + ", name=" + name + ", number=" + number
				+ "]";
	}
	public int getId() {
		return id;
	}
	public void setId(int id) {
		this.id = id;
	}
	public String getName() {
		return name;
	}
	public void setName(String name) {
		this.name = name;
	}
	public String getNumber() {
		return number;
	}
	public void setNumber(String number) {
		this.number = number;
	}
	
	

}

5. 在测试类里面增加新的测试方法:

package com.andy.db.test;

import java.util.List;

import com.andy.db.PersonSQLiteOpenHelper;
import com.andy.db.dao.PersonDao;
import com.andy.db.domain.Person;

import android.test.AndroidTestCase;
/**
 * 运行过程如果报以下错误，说明没有配置测试环境
 * 数据库_SqlLite does not specify a android.test.InstrumentationTestRunner instrumentation or does not declare uses-library android.test.runner in its AndroidManifest.xml
 * @author HuiQinBo
 *
 */
public class TestPersonDB extends AndroidTestCase {
	public PersonDao pd;
	
	/**
	 * getContext() 是测试框架给提供的上下文件
	 * 
	 * 来源:android.test.AndroidTestCase.getContext()
	 */
	public void testCreatePersonDb(){
		PersonSQLiteOpenHelper db = new PersonSQLiteOpenHelper(getContext());
		//打开或创建一个可写的数据库
		db.getWritableDatabase();
	}
	
	public void testAddPerson(){
		pd = new PersonDao(getContext());
		pd.addPerson("王五", "123456789");
	}
	
	public void testDeletePerson(){
		pd = new PersonDao(getContext());
		pd.deletePerson("张三");
	}
	
	public void testUpdatePerson(){
		pd = new PersonDao(getContext());
		pd.updatePerson("王五", "987654321");
	}

	public void testSelectPerson(){
		pd = new PersonDao(getContext());
		boolean result = pd.findPerson("李四");
		assertEquals(true, result);
	}
	
	public void testFindAll(){
		pd = new PersonDao(getContext());
		List<Person> persons = pd.findAllPerson();
		
		for(Person p: persons){
			System.out.println(p.toString());
		}
	}
}

6 效果图:

 

7项目源代码：请看附件