package com.itheima74.litepaltest;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import org.litepal.LitePal;
import org.litepal.crud.DataSupport;
import java.util.List;
/**
* litepal开源库的使用步骤:
* 0.github主页:https://github.com/LitePalFramework/LitePal
* 1.在build.gradle文件中添加依赖:compile 'org.litepal.android:core:1.5.0'
* 2.创建assets目录,在assets目录下创建litepal.xml
* 3.Application节点下配置name="org.litepal.LitePalApplication"
* 4.创建一个javabean
* 5.在litepal.xml文件list节点下添加<mapping class="com.itheima74.litepaltest.Book" />
* 6.调用LitePal.getDatabase()创建数据库
* 7.CRUD操作需要Book extends DataSupport
*/
public class MainActivity extends AppCompatActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}
// 点击按钮,创建一个数据库
public void createDatabase(View view) {
LitePal.getDatabase();
}
// 点击按钮,插入数据
public void insert(View view) {
Book book = new Book();
book.name = "The Da Vince Code";
book.author = "Dan Brown";
book.pages = 454;
book.price = 16.96;
book.press = "UnKnow";
book.save();
}
// 点击按钮,删除数据
public void delete(View view) {
DataSupport.deleteAll(Book.class, "price < ?", "15");
}
// 点击按钮,更新数据
public void update(View view) {
Book book = new Book();
book.price = 14.95;
book.press = "Author";
book.updateAll("name = ? and author = ?", "The Da Vince Code", "Dan Brown");
}
// 点击按钮,查询数据
public void query(View view) {
List<Book> bookList = DataSupport.findAll(Book.class);
for (Book book : bookList) {
System.out.println(book);
}
}
}
package com.itheima74.litepaltest;
import org.litepal.crud.DataSupport;
import static android.R.attr.id;
/**
* Created by My on 2017/3/10.
*/
class Book extends DataSupport {
int _id;
String author;
double price;
int pages;
String name;
String press;//出版社
@Override
public String toString() {
return "Book{" +
"id=" + id +
", author='" + author + '\'' +
", price=" + price +
", pages=" + pages +
", name='" + name + '\'' +
", press='" + press + '\'' +
'}';
}
}
<?xml version="1.0" encoding="utf-8"?>
<litepal>
<dbname value="BookStore" />
<version value="2" />
<list>
<mapping class="com.itheima74.litepaltest.Book" />
<mapping class="com.itheima74.litepaltest.Category" />
</list>
</litepal>
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