litepal更好的操作sqlite3

配置

在app下的build.gradle中加入

创建litepal.xml配置

在app/src/main下面创建assets，新建litepal.xml

<?xml version="1.0" encoding="utf-8" ?><litepal><dbname value="BookStore"></dbname><version value="2"></version><list><!-- 映射到类 --><mapping class="demo.jq.com.litepaltest.Book"></mapping><mapping class="demo.jq.com.litepaltest.Category"></mapping></list></litepal>

配置LitePalApplication,在AndroidMainfest.xml中

创建Book类

package demo.jq.com.litepaltest;/*** @author Jim*/public class Book {private int id;private String author;private double price;/*** 出版社*/private String press;private int pages;private String name;public int getId() {return id;}public void setId(int id) {this.id = id;}public String getAuthor() {return author;}public void setAuthor(String author) {this.author = author;}public double getPrice() {return price;}public void setPrice(double price) {this.price = price;}public int getPages() {return pages;}public void setPages(int pages) {this.pages = pages;}public String getName() {return name;}public void setName(String name) {this.name = name;}public String getPress() {return press;}public void setPress(String press) {this.press = press;}
}

创建分类类

package demo.jq.com.litepaltest;/*** @author jim*/public class Category {private int id;private String categoryName;private int categoryCode;public void setId(int id) {this.id = id;}public int getId() {return id;}public void setCategoryName(String categoryName) {this.categoryName = categoryName;}public String getCategoryName() {return categoryName;}public void setCategoryCode(int categoryCode) {this.categoryCode = categoryCode;}public int getCategoryCode() {return categoryCode;}
}

这个时候，调用Connector.getDatabase();

就会自动创建数据库。

import org.litepal.tablemanager.Connector;...// 初始化创建按钮Button createDatabase = (Button) findViewById(R.id.create_database);// 设置点击事件createDatabase.setOnClickListener(new View.OnClickListener(){@Overridepublic void onClick(View v) {// 执行写入数据库操作Connector.getDatabase();}});

添加数据

// 初始化添加数据按钮Button addData = (Button) findViewById(R.id.add_data);addData.setOnClickListener(new View.OnClickListener(){@Overridepublic void onClick(View v) {Book book = new Book();book.setName("The Da Vinci Code");book.setAuthor("Dan Brown");book.setPages(454);book.setPrice(16.96);book.setPress("XinNet");book.save();}});

更改数据

// 更改数据Button updateData = (Button) findViewById(R.id.update_data);updateData.setOnClickListener(new View.OnClickListener(){@Overridepublic void onClick(View v) {Book book = new Book();book.setPress("XinHua.Net");book.update(1);}});

删除数据

// 删除数据Button deleteData = (Button) findViewById(R.id.delete_data);deleteData.setOnClickListener(new View.OnClickListener(){@Overridepublic void onClick(View v) {DataSupport.deleteAll(Book.class,"id = ?","2");}});

查询数据

// 查询数据Button queryData = (Button) findViewById(R.id.query_data);queryData.setOnClickListener(new View.OnClickListener(){@Overridepublic void onClick(View v) {List<Book> books = DataSupport.findAll(Book.class);for (Book book :books) {Log.d(TAG,"book name is "+book.getName());Log.d(TAG,"book author is "+book.getAuthor());Log.d(TAG,"book pages is "+book.getAuthor());Log.d(TAG,"book price is "+book.getPrice());Log.d(TAG,"book press is "+book.getPress());Log.d(TAG,"--------------------------");}}});

更多查询

// 查询数据Button queryData = (Button) findViewById(R.id.query_data);queryData.setOnClickListener(new View.OnClickListener(){@Overridepublic void onClick(View v) {Book firstBook = DataSupport.findFirst(Book.class);Log.d(TAG,"the id is "+firstBook.getId());Log.d(TAG,"book name is "+firstBook.getName());Log.d(TAG,"book author is "+firstBook.getAuthor());Log.d(TAG,"book pages is "+firstBook.getAuthor());Log.d(TAG,"book price is "+firstBook.getPrice());Log.d(TAG,"book press is "+firstBook.getPress());Log.d(TAG,"--------------------------");Book lastBook = DataSupport.findLast(Book.class);Log.d(TAG,"the id is "+lastBook.getId());Log.d(TAG,"book name is "+lastBook.getName());Log.d(TAG,"book author is "+lastBook.getAuthor());Log.d(TAG,"book pages is "+lastBook.getAuthor());Log.d(TAG,"book price is "+lastBook.getPrice());Log.d(TAG,"book press is "+lastBook.getPress());Log.d(TAG,"--------------------------");}});