Java 选择查询一周中的哪一天？
我有一个事件表包含开始时间、结束时间、dayOfWeek、位置等。我想根据dayOfWeek检索记录。我把星期一保存为字符串 如何检索每天的记录 这是我的助手Java 选择查询一周中的哪一天？,java,android,sqlite,select,where-clause,Java,Android,Sqlite,Select,Where Clause,我有一个事件表包含开始时间、结束时间、dayOfWeek、位置等。我想根据dayOfWeek检索记录。我把星期一保存为字符串 如何检索每天的记录 这是我的助手 public class EventTableHelper extends SQLiteOpenHelper { private static final String TABLE = "event"; private static final String KEY_ID = "id"; private sta
public class EventTableHelper extends SQLiteOpenHelper {
private static final String TABLE = "event";
private static final String KEY_ID = "id";
private static final String KEY_TITLE = "title";
private static final String KEY_FROM_DATE = "datefrom";
private static final String KEY_TO_DATE = "dateto";
private static final String KEY_DAY_OF_WEEK = "dayofweek";
private static final String KEY_LOCATION = "location";
private static final String KEY_NOTIFICATION_TIME = "notification";
public EventTableHelper(Context context) {
super(context, Constants.DATABASE_NAME, null, Constants.DATABASE_VERSION);
}
@Override
public void onCreate(SQLiteDatabase db) {
}
public void createTable(SQLiteDatabase db){
String CREATE_EVENTS_TABLE = "CREATE TABLE " + TABLE+ "("
+ KEY_ID + " INTEGER PRIMARY KEY,"
+ KEY_TITLE + " TEXT,"
+ KEY_FROM_DATE + " DATE,"
+ KEY_TO_DATE + " DATE,"
+ KEY_DAY_OF_WEEK + " TEXT,"
+ KEY_LOCATION + " TEXT,"
+ KEY_NOTIFICATION_TIME + "TEXT" + ")";
db.execSQL(CREATE_EVENTS_TABLE);
}
// Upgrading database
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
db.execSQL("DROP TABLE IF EXISTS " + TABLE);
// createTable(db);
// onCreate(db);
}
public void addEvent(EventData event) {
SQLiteDatabase db = this.getWritableDatabase();
ContentValues values = new ContentValues();
values.put(KEY_TITLE,event.getTitle());
values.put(KEY_FROM_DATE, event.getFromDate());
values.put(KEY_TO_DATE,event.getToDate());
values.put(KEY_DAY_OF_WEEK,event.getDayOfWeek());
values.put(KEY_LOCATION,event.getLocation());
values.put(KEY_NOTIFICATION_TIME,event.getNotificationTime());
db.insert(TABLE, null, values);
db.close();
}
EventData getEvent(int id) {
SQLiteDatabase db = this.getReadableDatabase();
EventData eventData = new EventData();
Cursor cursor = db.query(TABLE, new String[]{KEY_ID,
KEY_TITLE, KEY_FROM_DATE, KEY_TO_DATE, KEY_DAY_OF_WEEK, KEY_LOCATION}, KEY_ID + "=?",
new String[]{String.valueOf(id)}, null, null, null, null);
if( cursor != null && cursor.moveToFirst() ) {
eventData = new EventData(Integer.parseInt(cursor.getString(0)), cursor.getString(1), cursor.getString(2),
cursor.getString(3), cursor.getString(4), cursor.getString(5),cursor.getString(6));
}
return eventData;
}
public List<EventData> getAllEvents() {
List<EventData> conList = new ArrayList<EventData>();
String selectQuery = "SELECT * FROM " + TABLE ;
SQLiteDatabase db = this.getWritableDatabase();
Cursor cursor = db.rawQuery(selectQuery, null);
if (cursor.moveToFirst()) {
do {
EventData event = new EventData();
event.setId(Integer.parseInt(cursor.getString(0)));
event.setTitle(cursor.getString(1));
event.setFromDate(cursor.getString(2));
event.setToDate(cursor.getString(3));
event.setDayOfWeek(cursor.getString(4));
event.setLocation(cursor.getString(5));
event.setNotificationTime(cursor.getString(6));
conList.add(event);
} while (cursor.moveToNext());
}
return conList;
}
public int updateEvent(EventData event) {
SQLiteDatabase db = this.getWritableDatabase();
ContentValues values = new ContentValues();
values.put(KEY_TITLE,event.getTitle());
values.put(KEY_FROM_DATE,event.getFromDate());
values.put(KEY_TO_DATE,event.getToDate());
values.put(KEY_DAY_OF_WEEK,event.getDayOfWeek());
values.put(KEY_LOCATION,event.getLocation());
values.put(KEY_NOTIFICATION_TIME,event.getNotificationTime());
// updating row
return db.update(TABLE, values, KEY_ID + " = ?",
new String[] { String.valueOf(event.getId()) });
}
public void deleteEvent(EventData eventData) {
SQLiteDatabase db = this.getWritableDatabase();
db.delete(TABLE, KEY_ID + " = ?",
new String[]{String.valueOf(eventData.getId())});
db.close();
}
}
public List<EventData> getAllEvents(String day) {
List<EventData> conList = new ArrayList<EventData>();
String selectQuery = "SELECT * FROM " + TABLE + " WHERE (" + KEY_DAY_OF_WEEK + " = " + day;
SQLiteDatabase db = this.getWritableDatabase();
Cursor cursor = db.rawQuery(selectQuery, null);
if (cursor.moveToFirst()) {
do {
EventData event = new EventData();
event.setId(Integer.parseInt(cursor.getString(0)));
event.setTitle(cursor.getString(1));
event.setFromDate(cursor.getString(2));
event.setToDate(cursor.getString(3));
event.setDayOfWeek(cursor.getString(4));
event.setLocation(cursor.getString(5));
event.setNotificationTime(cursor.getString(6));
conList.add(event);
} while (cursor.moveToNext());
}
return conList;
}
String day = "Mon"
mDb = new EventTableHelper(getActivity());
events = mDb.getAllEvents(day);
我正在另一项活动中节省星期一。我想检索片段中的记录。我不知道如何在函数中传递day参数。喜欢在
单引号中传递值
String selectQuery = "SELECT * FROM " + TABLE + " WHERE " + KEY_DAY_OF_WEEK +" = '"+day+ "'";
是否喜欢在单引号中传递值
String selectQuery = "SELECT * FROM " + TABLE + " WHERE " + KEY_DAY_OF_WEEK +" = '"+day+ "'";
替换这个
String selectQuery = "SELECT * FROM " + TABLE + " WHERE (" + KEY_DAY_OF_WEEK + " = " + day;
到
替换这个
String selectQuery = "SELECT * FROM " + TABLE + " WHERE (" + KEY_DAY_OF_WEEK + " = " + day;
到
如何传递到函数？events=mDb.getAllEvents（）；这里？@Sid使用类似于mDb.getAllEvents（“Mon”）仍在给出异常：e.SQLiteException:near“'Mon'”：语法错误（代码1）：，编译时：从事件中选择*WHERE（dayofweek='Mon'@Sid按照我的答案执行…您仍然使用旧代码。仔细检查我的答案。明白了..谢谢..@md。我如何传递到函数？events=mDb.getAllEvents（）；here？@Sid使用likemDb.getAllEvents（“Mon”）；
仍然给出异常：e.SQLiteException:near“'Mon'”：语法错误（代码1）：，编译时：SELECT*FROM event WHERE（dayofweek='Mon'@Sid按照我的答案执行…您仍然使用旧代码。请仔细检查我的答案。收到了..谢谢..@M D。