How to get data month wise sqflite in Flutter? - sqlite

Question

Image for how does data look I am making an expense tracker app using flutter, I want to show the sum of expenses done by the user every month for example:
Month Amount Spended
January 2000
February 1600
Database columns:
"CREATE TABLE $TABLE_EXPENSES ("
"$COLUMN_ID INTEGER PRIMARY KEY,"
"$COLUMN_NAME TEXT,"
"$COLUMN_AMOUNT TEXT,"
"$COLUMN_UNNECESSARYEXPENSES INTEGER,"
"$COLUMN_CATEGORY TEXT,"
"$COLUMN_DATETIME TEXT"
")",
I am using sqflite to create a database and I am storing data as text. I want to retrieve expenses of every day in a month and then sum up the expenses of every day and show it in ListTile
Edit:
Query: 'SELECT * SUM(COLUMN_AMOUNT) FROM TABLE_EXPENSES WHERE COLUMN_DATETIME >= ? AND COLUMN_DATETIME <= ?'
This is the error that I am getting (for query):
E/SQLiteLog(10318): (1) near "SELECT": syntax error
E/flutter (10318): [ERROR:flutter/lib/ui/ui_dart_state.cc(177)] Unhandled Exception: DatabaseException(near "SELECT": syntax error (code 1 SQLITE_ERROR): , while compiling: SELECT * FROM expenses WHERE SELECT * SUM(COLUMN_AMOUNT) FROM TABLE_EXPENSES WHERE COLUMN_DATETIME >= 2019 AND COLUMN_DATETIME <= 1989) sql 'SELECT * FROM expenses WHERE SELECT * SUM(COLUMN_AMOUNT) FROM TABLE_EXPENSES WHERE COLUMN_DATETIME >= ? AND COLUMN_DATETIME <= ?' args [2019, 1989]}
Function which I am currently using:
Future getDataJan() async{
final db = await database;
sumJan= db.rawQuery(
'SELECT SUM(AMOUNT) FROM EXPENSES WHERE DATETIME >= ? AND DATETIME <= ?',
[2021-01-01, 2021-01-31] ).then(Sqflite.firstIntValue);
finalJan=sumJan.toString();
}
Image:
errorImage
Thanks for your replies.

Answer 1

You can operate with a date with format like yyyy-MM-dd HH:mm:SS and create requests to database for search entities between month.
Date format example:
DateFormat('yyyy-MM-dd HH:mm:SS').format(date)
Query example:
return database.query(
tableName,
where: 'date >= ? and date <= ?',
whereArgs: [from, to],
)
.then((data) => data.map(_fromMap).toList());
Variables in example:
from - first day of month (2020-10-01);
to - last day of month (2020-10-31);
? in where - takes values from whereArgs (first ? - from, second - to);
Note: in comments describes that you should use SQFLite tooling for creating requests and do not use raw queries (for performance reasons).
Select example
final result = await database.rawQuery(
'select * sum(COLUMN_AMOUNT) from TABLE_EXPENSES where COLUMN_DATETIME >= ? and COLUMN_DATETIME <= ?',
[from, to],
).then(Sqflite.firstIntValue);