0
I M用發展着的應用保存在數據庫中的值？最好的辦法的Android和SQLite這裏是我的數據庫代碼請幫助我如何設置保存在數據庫中？我已經實現了功能，但dnt知道它是正確的方法，或者我可能需要使用類getter和setter保存值，並指出它如何在類中添加id屬性。什麼是採用了android和SQLite
public class DatabaseHandler extends SQLiteOpenHelper {
private static final int db_Version = 1;
private static final String tb_Name = "category_List";
private static final String tb_Name_Task = "task_List";
private static final String db_Name = "taskInformation";
public DatabaseHandler(Context context, String name, CursorFactory factory, int version) {
super(context, db_Name, factory, db_Version);
}
public void onCreate(SQLiteDatabase db) {
try {
db.execSQL(DatabaseAdapter.CREATE_TABLE);
db.execSQL(DatabaseAdapter.CREATE_TABLE_TASK);
//db.execSQL("DROP TABLE " + DatabaseAdapter.CREATE_TABLE_TASK);
Log.d("table message", "table created");
} catch (SQLiteException e) {
e.printStackTrace();
}
}
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
db.execSQL("DROP TABLE IF EXISTS " + tb_Name);
db.execSQL("DROP TABLE IF EXISTS " + tb_Name_Task);
onCreate(db);
}
} databaseAdapter類別：
public class DatabaseAdapter {
static final int db_Version = 1;
private static final String db_Name = "taskInformation";
private static final String tb_Name = "category_List";
public static final String KEY_ID ="id";
public static final String KEY_CATEGORY ="category";
static final String CREATE_TABLE = "CREATE TABLE " + tb_Name + "(" + KEY_ID + " INTEGER PRIMARY KEY AUTOINCREMENT, " + KEY_CATEGORY + " TEXT NOT NULL UNIQUE" +")";
private static final String tb_Name_Task ="task_List";
public static final String KEY_TITLE ="title";
public static final String KEY_DESCRIPTION ="description";
public static final String KEY_TASKDATE ="task_Date";
public static final String KEY_TASKCATEGORY = "task_Category";
public static final String KEY_STATUS ="task_Status";
static final String CREATE_TABLE_TASK = "CREATE TABLE " + tb_Name_Task + "(" + KEY_ID + " INTEGER PRIMARY KEY AUTOINCREMENT, " + KEY_TITLE + " TEXT NOT NULL UNIQUE, " + KEY_DESCRIPTION + " TEXT NOT NULL, " + KEY_TASKCATEGORY + " TEXT NOT NULL, " + KEY_TASKDATE + " TEXT NOT NULL, " + KEY_STATUS + " INTEGER NOT NULL" +")";
DatabaseAdapter dataAdapter;
public SQLiteDatabase db;
private final Context context;
private DatabaseHandler dbHandler;
public DatabaseAdapter(Context _context) {
context = _context;
dbHandler = new DatabaseHandler(context,db_Name, null, db_Version);
}
public DatabaseAdapter openToWrite() throws SQLiteException {
db = dbHandler.getWritableDatabase();
return this;
}
public DatabaseAdapter openToRead() throws SQLiteException
{
db = dbHandler.getReadableDatabase();
return this;
}
public void close()
{
db.close();
}
public SQLiteDatabase getDatabaseInstance()
{
return db;
}
是該方法正確的嗎？或者可以我需要通過MyClass的實例並保存使用getter和類的設置器值。
public void addTaskList(String title,String description,String date,String categorytask,Integer status)
{
ContentValues values = new ContentValues();
values.put(KEY_TITLE,title);
values.put(KEY_DESCRIPTION,description);
values.put(KEY_TASKCATEGORY,categorytask);
values.put(KEY_TASKDATE,date);
values.put(KEY_STATUS,status);
try
{long val = db.insertWithOnConflict(tb_Name_Task,null,values,SQLiteDatabase.CONFLICT_IGNORE);
}
catch (Exception e) {
// TODO: handle exception
e.printStackTrace();
}
}
請告訴我如何添加ID變量taskClass這樣，當我在列表視圖中的任何列表項點擊我可以得到該記錄的「ID」;
public class TaskClass {
//int task_id; //may i need to add if yes then how pls elaborate
int status;
String description;
String title;
String taskCategory;
String taskDate;
public TaskClass() {
//super();
// TODO Auto-generated constructor stub
}
public TaskClass(int status, String description, String title, String taskCategory, String taskDate) {
this.status = status;
this.description = description;
this.title = title;
this.taskCategory = taskCategory;
this.taskDate = taskDate;
}
public int getStatus() {
return status;
}
public void setStatus(int status) {
this.status = status;
}
public String getDescription() {
return description;
}
public void setDescription(String description) {
this.description = description;
}
public String getTitle() {
return title;
}
public void setTitle(String title) {
this.title = title;
}
public String getTaskCategory() {
return taskCategory;
}
public void setTaskCategory(String taskCategory) {
this.taskCategory = taskCategory;
}
public String getTaskDate() {
return taskDate;
}
public void setTaskDate(String taskDate) {
this.taskDate = taskDate;
}
@Override
public String toString() {
return "TaskClass [status=" + status + ", description=" + description + ", title=" + title + ", taskCategory=" + taskCategory + ", taskDate=" + taskDate + "]";
}
}