Question

我试图一次插入多行。

表格如下所示，

e.index = [str(n)+'mean' for n in range(1,13)]
df = df.append(e)
df = df.sort_index()

并插入功能

@Entity(nameInDb = "options")
public class Option {

    @Expose
    @SerializedName("id")
    @Id(autoincrement = true)
    private Long id;

    @Expose
    @SerializedName("option_text")
    @Property(nameInDb = "option_text")
    private String optionText;

    @Expose
    @SerializedName("question_id")
    @Property(nameInDb = "question_id")
    private Long questionId;

    @Expose
    @SerializedName("is_correct")
    @Property(nameInDb = "is_correct")
    private boolean isCorrect;

    @Expose
    @SerializedName("created_at")
    @Property(nameInDb = "created_at")
    private String createdAt;

    @Expose
    @SerializedName("updated_at")
    @Property(nameInDb = "updated_at")
    private String updatedAt;

    @Generated(hash = 435722130)
    public Option(Long id, String optionText, Long questionId, boolean isCorrect,
                  String createdAt, String updatedAt) {
        this.id = id;
        this.optionText = optionText;
        this.questionId = questionId;
        this.isCorrect = isCorrect;
        this.createdAt = createdAt;
        this.updatedAt = updatedAt;
    }

    @Generated(hash = 104107376)
    public Option() {
    }

    public Long getId() {
        return id;
    }

    public void setId(Long id) {
        this.id = id;
    }

    public String getOptionText() {
        return optionText;
    }

    public void setOptionText(String optionText) {
        this.optionText = optionText;
    }

    public Long getQuestionId() {
        return questionId;
    }

    public void setQuestionId(Long questionId) {
        this.questionId = questionId;
    }

    public boolean isCorrect() {
        return isCorrect;
    }

    public void setCorrect(boolean correct) {
        isCorrect = correct;
    }

    public String getCreatedAt() {
        return createdAt;
    }

    public void setCreatedAt(String createdAt) {
        this.createdAt = createdAt;
    }

    public String getUpdatedAt() {
        return updatedAt;
    }

    public void setUpdatedAt(String updatedAt) {
        this.updatedAt = updatedAt;
    }

    public boolean getIsCorrect() {
        return this.isCorrect;
    }

    public void setIsCorrect(boolean isCorrect) {
        this.isCorrect = isCorrect;
    }
}

此处选项列表包含除＆＃34; id＆＃34;之外的所有字段。这会自动增加。所以我在id的位置传递null。

但是我得到了唯一约束失败的异常。如果我只传递一个项目，则插入成功。

如何插入多行。

Answer 1

使您的Option类如下面的代码。

@Entity(
        indexes = {
                @Index(value = "id", unique = true)
        }
)
public class Option {
    @Id(autoincrement = true)
    private Long id;

    @Property(nameInDb = "option_text")
    private String optionText;

    @Property(nameInDb = "question_id")
    private Long questionId;

    @Property(nameInDb = "is_correct")
    private boolean isCorrect;

    @Property(nameInDb = "created_at")
    private String createdAt;

    @Property(nameInDb = "updated_at")
    private String updatedAt;

    public Option(String optionText, Long questionId, boolean isCorrect,
                  String createdAt, String updatedAt) {
        this.optionText = optionText;
        this.questionId = questionId;
        this.isCorrect = isCorrect;
        this.createdAt = createdAt;
        this.updatedAt = updatedAt;
    }

    public Option() {
    }

    @Generated(hash = 435722130)
    public Option(Long id, String optionText, Long questionId, boolean isCorrect,
            String createdAt, String updatedAt) {
        this.id = id;
        this.optionText = optionText;
        this.questionId = questionId;
        this.isCorrect = isCorrect;
        this.createdAt = createdAt;
        this.updatedAt = updatedAt;
    }

    public String getOptionText() {
        return optionText;
    }

    public void setOptionText(String optionText) {
        this.optionText = optionText;
    }

    public Long getQuestionId() {
        return questionId;
    }

    public void setQuestionId(Long questionId) {
        this.questionId = questionId;
    }

    public boolean isCorrect() {
        return isCorrect;
    }

    public void setCorrect(boolean correct) {
        isCorrect = correct;
    }

    public String getCreatedAt() {
        return createdAt;
    }

    public void setCreatedAt(String createdAt) {
        this.createdAt = createdAt;
    }

    public String getUpdatedAt() {
        return updatedAt;
    }

    public void setUpdatedAt(String updatedAt) {
        this.updatedAt = updatedAt;
    }

    public boolean getIsCorrect() {
        return this.isCorrect;
    }

    public void setIsCorrect(boolean isCorrect) {
        this.isCorrect = isCorrect;
    }

    public Long getId() {
        return this.id;
    }

    public void setId(Long id) {
        this.id = id;
    }
}

并插入如下数据。

  mDaoSession.getOptionDao().insert(new Option("anyText", 3L, true, "yesterday", "today"));

ID会自动递增。

这将解决您的问题。

Answer 2

我发现我正在插入具有相同数据的对象列表，我的意思是说我插入了冗余对象，因此它抛出了错误。我们无法插入冗余数据，因此问题得以解决。

在greenDAO数据库中插入多行时出错

2 个答案: