[英]How to get data between two dates from sqlite database which is in dd/mm/yyyy format
I'm building an app which select rows between to dates which is in dd/mm/yyyy format and count the row having status pending, signup and rejected. 我正在构建一个应用程序,该应用程序可以选择日期之间的行,日期格式为dd / mm / yyyy,并计算状态为未决,注册和拒绝的行。 I have done some work on it, but its not working.
我已经做了一些工作,但是没有用。 I stored date as TEXT in database.
我将日期作为TEXT存储在数据库中。 I pasted code below.
我在下面粘贴了代码。
public void showMonthlyPopUp(View view) {
weeklyDialog.setContentView(R.layout.pop_up_all_list);
TextView nameTextView = weeklyDialog.findViewById(R.id.textView);
nameTextView.setText("MONTHLY");
TextView pendingTextView = weeklyDialog.findViewById(R.id.textView6);
TextView signUpTextView = weeklyDialog.findViewById(R.id.textView3);
TextView rejectedTextView = weeklyDialog.findViewById(R.id.textView7);
Button shareButton = weeklyDialog.findViewById(R.id.button_share);
String[] projection = {
InfoContract.InfoEntry._ID,
InfoContract.InfoEntry.COLUMN_STATUS,
InfoContract.InfoEntry.COLUMN_DATE
};
Calendar calendar = Calendar.getInstance();
String strDate = calendar.get(Calendar.MONTH) + "/" + calendar.get(Calendar.YEAR);
int dayInt = calendar.get(Calendar.DAY_OF_MONTH);
String[] selectionArgs = new String[dayInt];
for (int i = 1; i <= dayInt; i++) {
selectionArgs[i - 1] = i + "/" + strDate;
}
String selection = InfoContract.InfoEntry.COLUMN_DATE + " =?";
for (int i = 1; i < dayInt; i++) {
selection += " OR " + InfoContract.InfoEntry.COLUMN_DATE + " =?";
}
Cursor cursor = this.getContentResolver().query(InfoContract.InfoEntry.CONTENT_URI, projection, selection, selectionArgs, null);
int pending = 0;
int signUp = 0;
int rejected = 0;
while (cursor.moveToNext()) {
int statusColumnIndex = cursor.getColumnIndex(InfoContract.InfoEntry.COLUMN_STATUS);
int status = cursor.getInt(statusColumnIndex);
if (status == InfoContract.InfoEntry.STATUS_SIGN_UP) signUp = signUp + 1;
else if (status == InfoContract.InfoEntry.STATUS_REJECTED) rejected++;
else pending++;
}
cursor.close();
pendingTextView.setText("" + pending);
signUpTextView.setText("" + signUp);
rejectedTextView.setText("" + rejected);
weeklyDialog.show();
final int finalPending = pending;
final int finalSignUp = signUp;
final int finalRejected = rejected;
shareButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
shareData(finalPending, finalSignUp, finalRejected, "Monthly Details: ");
}
});
}
Life will be quite hard using the format dd/mm/yyyy as it's not readily usable by the most obvious SELECT using a BETWEEN clause as part of the WHERE clause, even harder when dd/mm/yyyy is often with single characters for values that are less than 10 (eg 1/1/2019 instead of 10/10/2019). 使用dd / mm / yyyy格式的日子将非常艰辛,因为使用BETWEEN子句作为WHERE子句的一部分时,最明显的SELECT并不容易使用它,当dd / mm / yyyy经常使用单个字符表示值时,甚至更难小于10(例如1/1/2019而不是10/10/2019)。
Consider mytable created and loaded using :- 考虑使用以下命令创建和加载mytable :
DROP TABLE IF EXISTS mytable;
CREATE TABLE IF NOT EXISTS mytable (mydatecolumn TEXT, myothercolumn TEXT DEFAULT 'BLAH');
INSERT INTO mytable (mydatecolumn)
VALUES
('01/01/2019'),('1/1/2019'),('01/1/2019'),('1/01/2019'),
('10/1/2019'),('10/10/2019'),('1/10/2019'),('01/02/2019'),
('1/3/2019'),('01/1/2019'),('14/01/2019'),('10/1/2019'),
('10/10/2020'),('1/10/2018')
;
Which looks like :- 看起来像:-
The query to transpose values and to then select a date range could be :- 用于转置值然后选择日期范围的查询可能是:-
-- An example that would hanlde dd/mm/yyyy where dd and mm could be either 1 or 2 characters
WITH
-- First CTE gets the day and the rest of the date
ctedaypart AS (
SELECT
rowid AS daypartid,
substr(mydatecolumn,1,instr(mydatecolumn,'/')-1) AS day_part,
substr(mydatecolumn,instr(mydatecolumn,'/')+1) AS rest_after_day
FROM mytable
),
-- Second CTE gets the month and the rest of the date
ctemonthpart AS (
SELECT
daypartid AS monthpartid,
substr(rest_after_day,1,instr(rest_after_day,'/')-1) AS month_part,
substr(rest_after_day,instr(rest_after_day,'/')+1) AS year
FROM ctedaypart
),
-- Third CTE expands the day and month the have a leading 0 id less than 10 and joins the parts to form YYYY-MM-DD
expandedparts AS (
SELECT
*,
mytable.rowid AS expandedpartsid,
year||'-'||
CASE WHEN length(month_part) = 1 THEN '0'||month_part ELSE month_part END ||'-'||
CASE WHEN length(day_part) = 1 THEN '0'||day_part ELSE day_part END AS date_in_sqlite_format
FROM mytable JOIN ctedaypart ON mytable.rowid = daypartid JOIN ctemonthpart ON daypartid = monthpartid)
SELECT mytable.* FROM mytable JOIN expandedparts ON mytable.rowid = expandedpartsid WHERE (date_in_sqlite_format) BETWEEN ('2019-01-01') AND ('2019-03-31');
The above results in 10 of the 14 rows being selected as per :- 上面的结果是按以下方式选择了14行中的10行:
If the date is saved in the database in a recognised format eg YYYY-MM-DD then the above could simply be :- 如果日期以公认的格式(例如YYYY-MM-DD)保存在数据库中,则上述内容可能只是:-
SELECT * FROM mytable WHERE (mydatecolumn) BETWEEN ('2019-01-01') AND ('2019-03-31');
As such it is suggested that you adopt the use of a recognised format for dates when interacting with the database :- 因此,建议您在与数据库交互时对日期使用公认的格式 :-
Time Strings A time string can be in any of the following formats: YYYY-MM-DD YYYY-MM-DD HH:MM YYYY-MM-DD HH:MM:SS YYYY-MM-DD HH:MM:SS.SSS YYYY-MM-DDTHH:MM YYYY-MM-DDTHH:MM:SS YYYY-MM-DDTHH:MM:SS.SSS HH:MM HH:MM:SS HH:MM:SS.SSS now DDDDDDDDDD
SQL As Understood By SQLite - Date And Time Functions SQLite理解的SQL-日期和时间函数
The alternative is to use or adapt the complex query above or use one that is similar. 另一种选择是使用或改编上面的复杂查询,或使用类似的查询。
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