LitePal

首先在dependencies闭包添加依赖

compile 'org.litepal.android:core:1.5.1'

在APP目录下创建assets

定义要写入数据库中的类

public class Book extends DataSupport{
    private int id;
    private String Author;
    private double price;

    public int getId() {
        return id;
    }

    public void setId(int id) {
        this.id = id;
    }
    public String getAuthor() {
        return Author;
    }
   public void setAuthor(String author) {
        Author = author;
    }
    public double getPrice() {
        return price;
    }
    public void setPrice(double price) {
        this.price = price;
    }
}

在Activity中进行增删查改

 case R.id.bt_create:
                Connector.getDatabase();
                break;
            case R.id.bt_insert:
                Book book=new Book();
                book.setId(1);
                book.setAuthor("刘营海");
                book.setPrice(90);
                book.save();
                break;
            case R.id.bt_updata:
                Book book1=new Book();
                book1.setPrice(80);
                book1.updateAll("Author=?","刘营海");
                break;
            case R.id.bt_delete:
                DataSupport.deleteAll(Book.class,"Author=?","刘营海");
                break;
            case R.id.bt_select:
                List books=DataSupport.findAll(Book.class);
                for (Book book2:books){
                mTvshow.append(book2.toString());

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