Question

我正在创建一个我遵循给定过程的数据库，但我需要在不同的不同列中插入大量数据，为此我必须在Array中添加值，然后将它们插入到数据库中？？如果是的话那怎么样？通过这样做我将如何与其他表的数据匹配/检索它们，因为我有更多的表。任何形式的帮助/建议都会得到真正的赞赏。

将值添加到表中就像：

floor(4.9)

我的模型类就像：

   public void addMidSemQuestions(MidSemQuestions midSemQuestions)
{
    openWritable();
    m_sqLiteDatabase.beginTransaction();
    try {
        ContentValues values = new ContentValues();
        values.put(KEY_SEM_ID, midSemQuestions.getId());
        values.put(KEY_SUBJECT, midSemQuestions.getSubject());
        values.put(KEY_QUESTION_ID, midSemQuestions.getQuestion_id());
        values.put(KEY_QUESTION, midSemQuestions.getQuestion());
        // Notice how we haven't specified the primary key. SQLite auto increments the primary key column.
        m_sqLiteDatabase.insertOrThrow(MID_SEM_QUESTION_TABLE, null, values);
        m_sqLiteDatabase.setTransactionSuccessful();
    }catch (Exception e)
    {
        Log.d(LOG,"Error while trying to add mid sem questions to database");
    }finally {
        m_sqLiteDatabase.endTransaction();
    }
}

}

我需要填写数据，以便我这样做：

public class MidSemQuestions
{
public int id;
public int sem_id;
public int sub_id;
public int marks_id;
public int question_id;
public String subject;
public String question;

public MidSemQuestions() {
}

public MidSemQuestions(int sem_id, int sub_id, int marks_id, int question_id, String subject,String question) {
    this.sem_id = sem_id;
    this.sub_id = sub_id;
    this.marks_id = marks_id;
    this.question_id = question_id;
    this.subject=subject;
    this.question = question;
}

public String getSubject() {
    return subject;
}

public void setSubject(String subject) {
    this.subject = subject;
}

public int getSub_id() {
    return sub_id;
}

public void setSub_id(int sub_id) {
    this.sub_id = sub_id;
}

public int getSem_id() {
    return sem_id;
}

public void setSem_id(int sem_id) {
    this.sem_id = sem_id;
}

public int getMarks_id() {
    return marks_id;
}

public void setMarks_id(int marks_id) {
    this.marks_id = marks_id;
}

public int getQuestion_id() {
    return question_id;
}

public void setQuestion_id(int question_id) {
    this.question_id = question_id;
}

public String getQuestion() {
    return question;
}

public void setQuestion(String question) {
    this.question = question;
}

public int getId() {
    return id;
}

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

Answer 1

假设你有这个字段的arraylist，其中包含所有值您希望使用模型类在数据库中插入。

List<String> sem_id=new ArrayList<>();
List<String> String sub_id=new ArrayList<>();
List<String> String marks_id=new ArrayList<>();
List<String> String question_id=new ArrayList<>();
List<String> Strubg subject=new ArrayList<>();
List<String> String question=new ArrayList<>();

对于保存到数据库，假设，databasehelper.addData（）是将数据添加到数据库的数据库对象

for(int i=0;i<sem_id.size();i++{
    databasehelper.addData(new CDataSource(this).addMidSemQuestions(
    new MidSemQuestions(sub_id.get(i),
    marks_id.get(i),question_id.get(i),
    subject_id.get(i),question.get(i))));
}

并且要从数据库批量数据中获取，您的数据库应该返回列表格式，

此处midsem list将从Database

获取所有值

List<MidSemQuestions> midsem=new ArrayList<MidSemQuestions>();
midsem=database.getAllFieldsFromDatabase();

 for(MidSemQuestions values:midsem){

    String sub_id=values.getSub_id();
    String sem_id=values.getSem_id();
    String marks_id=values.getMarks_id();
    String question_id=values.getQuestion_id();
    String subject_id=values.getSubject_id();
    String question=values.getQuestion();

 //if you want array list then, put it in arraylist
 //or anything you like 

 }

使用模型类将arrayList保存到sqlite表

1 个答案: