如何将日期和时间从Java存储到数据库
我正在Android Studio中开发一个应用程序，我需要实施一次会议，因此我使用TimePickerDialog和CalenderView添加日期和时间。我想检索这2条信息并将它们存储在myDB中。
1-如何在Java中将CalendarView中的日期存储到Date类中，如何将时间存储到DatePicker中。
2-如何将java类中的日期插入到SQLite中，以及如何插入时间。
这是我的代码
RDV_Activity
CalendarView cv ;
TextView showTime;
TimePickerDialog timePicker;
EditText heure,titre;
Time time ;
Date d;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_rdv);
showTime= (TextView) findViewById(R.id.showTime);
cv= (CalendarView) findViewById(R.id.cv);
btn_ajouter = (Button) findViewById(R.id.btn_ajouter);
heure = (EditText) findViewById(R.id.heure);
cv.setOnDateChangeListener(new CalendarView.OnDateChangeListener() {
@Override
public void onSelectedDayChange(@NonNull CalendarView view, int
year, int month, int dayOfMonth) {
String date = dayOfMonth + "/" + (month + 1) + "/" + year ;
d= new Date(year,month,dayOfMonth);
System.out.println(d.toString());
}
});
heure.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
final Calendar calendar = Calendar.getInstance();
final int hour = calendar.get(Calendar.HOUR);
int minute = calendar.get(Calendar.MINUTE);
timePicker = new TimePickerDialog(Rdv.this, new
TimePickerDialog.OnTimeSetListener() {
@Override
public void onTimeSet(TimePicker timePicker, int
selectedHour, int selectedMinute) {
showTime.setText( selectedHour + ":" +
selectedMinute);
}
}, hour, minute, true);
timePicker.setTitle("Choose time");
time.setHours(hour);
time.setMinutes(minute);
System.out.println(""+time.getHours());
System.out.println(""+1);
timePicker.show();
showTime.setText(heure.getText());
}
});
titre = (EditText) findViewById(R.id.titre);
RDV r = new RDV(d,time,titre.getText().toString());
}
}
RDV类
private final int idR;
private int cpt=0;
private Date dateR;
private Time heure ;
private String titre ;
public RDV(Date dateR, Time heure, String titre)
{
this.dateR = dateR;
this.heure = heure;
this.titre = titre;
cpt++;
idR = cpt;
}
数据库
String CREATE_TABLE_RDV = "CREATE TABLE " + table_Rdv + " (" + ID_R + "
INTEGER PRIMARY KEY AUTOINCREMENT, "+ TITRE +
" VARCHAR NOT NULL, " +DATE_R+ " Date NOT NULL, " +HEURE_R+ "
Time NOT NULL, " +ID_F+ " INTEGER NOT NULL ,"+
" CONSTRAINT FK1 FOREIGN KEY ( " +ID_F+") REFERENCES
"+table_Femme+"("+ID_F+") )";
db.execSQL(CREATE_TABLE_RDV);
public void insererRdv(RDV r)
{
SQLiteDatabase db = this.getWritableDatabase();
ContentValues vals = new ContentValues();
vals.put(TITRE,r.getTitre());
vals.put(HEURE_R,r.getHeure().toString());
vals.put(DATE_R ,r.getDateR().toString());
db.insert(table_Rdv,null,vals);
db.close();
}
谢谢。
1 个答案:
答案 0 :(得分：0)
这是一个基于您的代码的工作示例：-
利用Calendar和SimpleDateFormat类将日期和时间保存在单个列中，既长（更有效的方式，即占用更少的空间），也保存为String。两者都与SQLite Date and Time functions兼容，因此日期/时间操作轻而易举，因为返回日期和时间几乎是您想要的任何格式。
DatabaseHelper
public class DBHelper extends SQLiteOpenHelper {
public static final String DBNAME = "mydb";
public static final int DBVERSION = 1;
public static final String table_Rdv = "rdv";
public static final String ID_R = BaseColumns._ID;
public static final String TITRE = "titre";
public static final String DATE_R ="date_r";
public static final String HEURE_R = "heure_r";
public static final String ID_F = "id_f";
public static final String DATETIMELONG = "datetimelong";
public static final String DATETIMESTRING = "datetimestring";
public DBHelper(Context context) {
super(context, DBNAME, null, DBVERSION);
this.getWritableDatabase();
}
@Override
public void onCreate(SQLiteDatabase db) {
String CREATE_TABLE_RDV = "CREATE TABLE " + table_Rdv + " (" +
ID_R + " INTEGER PRIMARY KEY AUTOINCREMENT, " +
TITRE + " VARCHAR NOT NULL, " +
DATE_R+ " Date NOT NULL, " + //<<<<<<<<<< Column Not needed
HEURE_R+ " Time NOT NULL, " + //<< Column not needed
// Note only one of the two following columns are needed
// Using SQLite date and time functions you can do very much what you want
// see https://www.sqlite.org/lang_datefunc.html
DATETIMELONG + " INTEGER, " + //<<<<<<<<<< Column will hold both date and time as long
DATETIMESTRING + " TEXT, " + //<<<<<<<<<< Column will hold both date and time as String YYYY-MM-DD HH:MM
ID_F+ " INTEGER NOT NULL " +
//", CONSTRAINT FK1 FOREIGN KEY ( " + ID_F + ") REFERENCES "+ table_Femme + "("+ID_F+") " + // Commented out for demo
")";
db.execSQL(CREATE_TABLE_RDV);
}
public long addRDVRow(String titre, long datetimelong, String datetimestring) {
ContentValues cv = new ContentValues();
cv.put(TITRE,titre);
cv.put(DATE_R,"NOTHING NEEDED HERE AS NOT USED");
cv.put(HEURE_R,"NOTHING NEEDED HERE AS NOT USED");
cv.put(DATETIMELONG,datetimelong);
cv.put(DATETIMESTRING,datetimestring);
cv.put(ID_F,0); //<<<<<<<<<< as no fk constraint anything will do for demo so 0
SQLiteDatabase db = this.getWritableDatabase();
return db.insert(table_Rdv,null,cv);
}
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
}
}
活动：-
public class MainActivity extends AppCompatActivity {
CalendarView cv;
TimePickerDialog timepicker;
TextView showtime;
TextView showdatetime; //<<<<<<<<<< ADDED for demo
Button btn_ajouter;
Calendar cal;
SimpleDateFormat sdfFull = new SimpleDateFormat("yyyy-MM-dd HH:mm");
SimpleDateFormat sdfTime = new SimpleDateFormat("HH:mm");
int mYear,mMonth,mDay,mHour,mMin;
DBHelper mDBHlpr;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mDBHlpr = new DBHelper(this);
cv = this.findViewById(R.id.cv);
cal = Calendar.getInstance();
showtime = this.findViewById(R.id.showtime);
showdatetime = this.findViewById(R.id.showdatetime);
btn_ajouter = this.findViewById(R.id.btn_ajouter);
handleDateTime(); // set to show current date time
handleDate(); // Handle the Calendar View
handleTime(); // Handle the TimePicker
btn_ajouter.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
mDBHlpr.addRDVRow("Whatever",cal.getTimeInMillis(),sdfFull.format(cal.getTime())); //<<<<<<<<<< Add new row to db
//for demonstration
DatabaseUtils.dumpCursor(
mDBHlpr.getWritableDatabase().query(
DBHelper.table_Rdv,
null,null,null,null,null,null
)
);
}
});
}
public void handleDate() {
cv.setOnDateChangeListener(new CalendarView.OnDateChangeListener() {
@Override
public void onSelectedDayChange(CalendarView view, int year, int month, int dayOfMonth) {
mYear = year;
mMonth = month;
mDay = dayOfMonth;
handleDateTime();
}
});
}
public void handleTime() {
showtime.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
timepicker = new TimePickerDialog(v.getContext(), new TimePickerDialog.OnTimeSetListener() {
@Override
public void onTimeSet(TimePicker view, int hourOfDay, int minute) {
mHour = hourOfDay;
mMin = minute;
handleDateTime();
}
},mHour,mMin,true);
timepicker.setTitle("Pick Time");
timepicker.show();
}
});
}
private void handleDateTime() {
cal.set(mYear,mMonth,mDay,mHour,mMin);
showtime.setText(sdfTime.format(cal.getTime()));
showdatetime.setText(sdfFull.format(cal.getTime()) + " or as long " + String.valueOf(cal.getTimeInMillis())); // SQL YYYY-MM-DD HH:MM format
}
}
结果
该应用看起来像：-
单击“确定”后，TextViews显示：-
点击按钮后，该行即被添加并显示在日志中，例如（第二行，之前已添加第一行）
05-01 11:17:40.282 23152-23152/q.so55927409 I/System.out: >>>>> Dumping cursor android.database.sqlite.SQLiteCursor@a40a2ab 05-01 11:17:40.283 23152-23152/q.so55927409 I/System.out: 0 { 05-01 11:17:40.283 23152-23152/q.so55927409 I/System.out: _id=1 05-01 11:17:40.283 23152-23152/q.so55927409 I/System.out: titre=Whatever 05-01 11:17:40.283 23152-23152/q.so55927409 I/System.out: date_r=NOTHING NEEDED HERE AS NOT USED 05-01 11:17:40.283 23152-23152/q.so55927409 I/System.out: heure_r=NOTHING NEEDED HERE AS NOT USED 05-01 11:17:40.283 23152-23152/q.so55927409 I/System.out: datetimelong=-125838902353924 05-01 11:17:40.283 23152-23152/q.so55927409 I/System.out: datetimestring=2019-05-16 15:20 05-01 11:17:40.283 23152-23152/q.so55927409 I/System.out: id_f=0 05-01 11:17:40.283 23152-23152/q.so55927409 I/System.out: } 05-01 11:17:40.283 23152-23152/q.so55927409 I/System.out: 1 { 05-01 11:17:40.283 23152-23152/q.so55927409 I/System.out: _id=2 05-01 11:17:40.283 23152-23152/q.so55927409 I/System.out: titre=Whatever 05-01 11:17:40.283 23152-23152/q.so55927409 I/System.out: date_r=NOTHING NEEDED HERE AS NOT USED 05-01 11:17:40.283 23152-23152/q.so55927409 I/System.out: heure_r=NOTHING NEEDED HERE AS NOT USED 05-01 11:17:40.283 23152-23152/q.so55927409 I/System.out: datetimelong=-125838880753924 05-01 11:17:40.283 23152-23152/q.so55927409 I/System.out: datetimestring=2019-05-16 21:20 05-01 11:17:40.283 23152-23152/q.so55927409 I/System.out: id_f=0 05-01 11:17:40.283 23152-23152/q.so55927409 I/System.out: } 05-01 11:17:40.283 23152-23152/q.so55927409 I/System.out: <<<<<
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