Question

我有一个来自API的ArrayList，我的POJO（普通旧Java对象）具有所需的getter和setter。

@SerializedName("staff")
@Expose
private List<String> staff = new ArrayList<String>();
@SerializedName("departments")
@Expose
private List<String> departments = new ArrayList<String>();

我想将员工和部门添加到 SQLite表中。我现有的表具有其余的字符串值。但是我无法将 ArrayList 添加到表中。

public static final String CREATE_TABLE_QUERY = "CREATE TABLE " + TABLE_NAME + "" +
            " (" + ID + " TEXT PRIMARY KEY not null, " +
            //need to change product id into String or TEXT
            CLIENTS_NAME + " TEXT not null," +
            CLIENTS_ADDRESS1 + " TEXT not null," +
            CLIENTS_ADDRESS2 + " TEXT not null," +
            CLIENTS_ADDRESS3 + " TEXT not null," +
            CLIENTS_ADDRESS4 + " TEXT not null," +
            TYPE + " TEXT not null," +
            CLIENTS_CONTACT + " TEXT not null)" ;

如何添加Arraylist？我试过了this但它不起作用。任何链接或提示将不胜感激。

这是将其余字符串值插入数据库。注意，我还没有将 staff 添加到数据库表中，因为我不知道如何在数据库中插入一个Arraylist表

 public void addProducts(Clients_POJO products) {
    //CRUD , adding Products

    SQLiteDatabase db = this.getWritableDatabase();
    ContentValues values = new ContentValues();
    values.put(Constants.ClientsDATABASE.ID, products.getId());
    values.put(Constants.ClientsDATABASE.CLIENTS_NAME, products.getName());
    values.put(Constants.ClientsDATABASE.CLIENTS_ADDRESS1, products.getAddress1());
    values.put(Constants.ClientsDATABASE.CLIENTS_ADDRESS2, products.getAddress2());
    values.put(Constants.ClientsDATABASE.CLIENTS_ADDRESS3, products.getAddress3());
    values.put(Constants.ClientsDATABASE.CLIENTS_ADDRESS4, products.getAddress4());
    values.put(Constants.ClientsDATABASE.TYPE, products.getType());
    values.put(Constants.ClientsDATABASE.CLIENTS_CONTACT, products.getContact());

    try {

        db.insert(Constants.ClientsDATABASE.TABLE_NAME, null, values);
    } catch (Exception e) {
        Log.d(TAG, e.getMessage());
    }

Answer 1

我找到了解决方案而没有使用GSON转换它。 让部门的POJO值为ArrayList。

@SerializedName("departments")
@Expose
private List<String> departments = new ArrayList<String>();

要创建数据库，我们将列作为字符串存储在表中。

public static final String INPUT_DEPARTMENTS = "departments";
public static final String CREATE_TABLE_QUERY = "CREATE TABLE " + TABLE_NAME + "" +
            " (" + ID + " TEXT PRIMARY KEY not null, " +
            INPUT_DEPARTMENTS + " TEXT not null)" ;

现在在SQLite数据库中存储和检索数据时.Storing - ＆gt;

public void addProducts(Clients_POJO products) {
    //CRUD , adding Products
    SQLiteDatabase db = this.getWritableDatabase();
    ContentValues values = new ContentValues();
    values.put(Constants.ClientsDATABASE.INPUT_DEPARTMENTS, String.valueOf(products.getDepartments()));
    try {

        db.insert(Constants.ClientsDATABASE.TABLE_NAME, null, values);
    } catch (Exception e) {
        Log.d(TAG, e.getMessage());
    }

为了检索数据，我们会将其转换回arraylist以将值存储在POJO中。

SQLiteDatabase db = this.getWritableDatabase();
    final ProductFetchListener mListener = listener;
    Cursor cursor = db.rawQuery(Constants.ClientsDATABASE.GET_PRODUCTS_QUERY,null);
    final List<Clients_POJO> productsListDB = new ArrayList<>();
    if (cursor.getCount() > 0) {
        if (cursor.moveToFirst()) {
            do {
                Clients_POJO products = new Clients_POJO();
                products.setFromDatabase(true);

现在我们将其转换为arraylist。

String s =  cursor.getString(cursor.getColumnIndex(Constants.ClientsDATABASE.INPUT_DEPARTMENTS));
List<String> myList = new ArrayList<String>(Arrays.asList(s.split(",")));
products.setDepartments(myList);

在SQLite数据库中插入ArrayList

1 个答案: