Question

问题是我有一个表产品，我的更新脚本不能正常工作。这一切都是假的。

Product.class

@DatabaseTable(tableName = "Product")
public class Product  {
@DatabaseField(index = true, generatedId = true)
private int productId;

@DatabaseField
private String name;

@DatabaseField
private int quantity;

//@DatabaseField(canBeNull = true)
//private Integer categorie;
//http://logic-explained.blogspot.com.ar/2011/12/using-ormlite-in-android-projects.html

@DatabaseField
private int categorie;

//@ForeignCollectionField
//private ForeignCollection<Categorie> itemsCategorie;  

@DatabaseField
private String description;

@DatabaseField
private String photo;

Product() {
}
public Product(int productId, String name, int quantity,            int categorie, String description, String photo) {
    super();
    this.productId = productId;
    this.name = name;
    this.quantity = quantity;
    this.categorie = categorie;
    this.description = description;
    this.photo = photo;
}



public void setDescription(String description) {
    this.description = description;
}
public String getName() {
    return name;
}

public void setName(String name) {
    this.name = name;
}

public String getAddress() {
    return description;
}

public void setAddress(String address) {
    this.description = address;
}
public int getProductId() {
    return productId;
}

public void setProductId(int productId) {
    this.productId = productId;
}

public int getQuantity() {
    return quantity;
}

public void setQuantity(int quantity) {
    this.quantity = quantity;
}

public int getCategorie() {
    return categorie;
}

public void setCategorie(int categorie) {
    this.categorie = categorie;
}

public String getPhoto() {
    return photo;
}

public void setPhoto(String photo) {
    this.photo = photo;
}
public CharSequence getDesc() {
    return null;
}


}

我的脚本updateProduct

public boolean updateProduct(Product p) {
    boolean ret = false;
    if (productDao != null) {
        try {
            productDao = getDao(Product.class);

            UpdateBuilder<Product, Integer> updateBuilder = productDao
                    .updateBuilder();
            updateBuilder.updateColumnValue("name", p.getName());
            updateBuilder.updateColumnValue("quantity", p.getQuantity());
            updateBuilder.updateColumnValue("categorie", p.getCategorie());
            updateBuilder.updateColumnValue("description", p.getDesc());
            updateBuilder.updateColumnValue("photo", p.getPhoto());

            // but only update the rows where the description is some value
            updateBuilder.where().eq("productId", p.getProductId());
            // actually perform the update

            String str = updateBuilder.prepareStatementString();
            // UPDATE `Product` SET `name` = 'gcd' ,`quantity` = 1
            // ,`categorie` = 1 ,`description` = ? ,`photo` = '' WHERE
            // `productId` = 0

            if (productDao.update(updateBuilder.prepare()) != 1) {
                ret = false;
            } else {
                productDao.refresh(p);
                ret = true;
            }
        } catch (Exception e) {
            ret = false;
            e.printStackTrace();
        }
    }
    return ret;
}

然后我用这样的函数调用它，但总是返回false：（

public boolean updateProduct(Product p) {
    boolean ret = false; 
    try {
        ret = getHelper().updateProduct(p);




    } catch (Exception e) {
        e.printStackTrace();
        ret =false;
    }
    return ret;

}

我可以创建和删除，但我无法更新。我尝试了一切。如果你花点时间回答我的问题，我将不胜感激。

Answer 1

对于其他开发人员，如果您面对这样的问题，则应确保该表必须具有身份密钥。

@DatabaseTable(tableName = "User")
public class User  {
    @DatabaseField(generatedId = true)
    public int id;
    @DatabaseField
    public String ServiceUserId;
    @DatabaseField
    public boolean IsActive;
    @DatabaseField
    public String FirstName;
    @DatabaseField
    public String LastName;
    @DatabaseField
    public String Key;
    @DatabaseField
    public String Email;
}

Answer 2

解决方案是只需从DB获取对象产品的实例然后修改为最终发送到updateProduct方法。

例如，首先我需要先创建任何方法来获取ID

的对象

   // get the Instance calling to the  getProductByID
   Product p = getHelper().getProductByID(p.getId())

   //modify any value of the product
   p.setFirstName("asd");

   //call the update
   ret = getHelper().updateProduct(p);

然后我的对象被更新。

Answer 3

注意对象ID（应该相同），并使用natif函数update（Product）;

Answer 4

在这种情况下，您必须覆盖equals和hashCode。

我无法用ormlite android更新表

4 个答案: