Using SQL Server 2008, Visual Studio 2008.
Trying to convert the data from a string column into a derived Date column.
The string can be in two formats, either : "dd/mm/yy" (where century 20 can be assumed), or "dd/mm/yyyy" . e.g. "02/05/12", "23/12/02", "13/08/2012".
So I tried an expression like this for a Derived column :
DateReceived == "" ? NULL(DT_DATE) : (DT_DATE)((LEN(RTRIM(DT_DATE)) == 10 ? SUBSTRING(DateReceived,7,4) : ("20" + SUBSTRING(DateReceived,7,2))) + "-" + SUBSTRING(DateReceived,4,2) + "-" + SUBSTRING(DateReceived,1,2))
but Visual Studio gives error :
"The expression was not valid, or there is an out-of-memory error".
It accepts a simpler expression like :
DateReceived == "" ? NULL(DT_DATE) : (DT_DATE)("20" + SUBSTRING(DateReceived,7,2) + "-" + SUBSTRING(DateReceived,4,2) + "-" + SUBSTRING(DateReceived,1,2))
but this expression will only work for "dd/mm/yy" format.
What am I doing wrong ? Thanks.
Never mind, the error was due to a typo. (Was calling RTRIM on the column type, not column name).
The following works :
DateReceived == "" ? NULL(DT_DATE) : (DT_DATE)((LEN(RTRIM(DateReceived)) == 10 ? SUBSTRING(DateReceived,7,4) : ("20" + SUBSTRING(DateReceived,7,2))) + "-" + SUBSTRING(DateReceived,4,2) + "-" + SUBSTRING(DateReceived,1,2))
Related
I am using Tradingview Pinescript 4.0.
This message was made with reference to :
https://stackoverflow.com/questions/66926863/combining-data-from-different-tradingview-4-0-indicators-for-the-purpose-of-crea
Basically, what I would like to do is use Tradingview 4.0 Pinescript Strategies with the Tradingview Webhook Alert system.
The closest I have seen that provides a hint a to how one can do this is found in this particular video (for a different product):
https://support.mudrex.com/hc/en-us/articles/360050211072-Automating-an-alert-from-a-Strategy-on-TradingView
It would use something like the "comment" below:
// strategy.entry(id=tostring(randomNumber), long=false,
comment="{"id" : " + tostring(randomNumber) + ", "action" :
"reverse_short_to_long"}")
I need to send JSON from the Strategy as part of the Web alert. According to the video, one would use something like:
{{ strategy.comment }}
Are there any solid examples as to how this could be done?
Tradingview sends the alert as JSON if the string is formatted as JSON. I suggest using the alert() function instead of alertcondition. It's then easy to construct a string in a JSON format however you want. Here's a nasty function I use to generate alerts.
customalert(_name, _symbol, _type, _asset_type, _action, _risk_value, _risk_percent, _sl, _tp1,_tp1_percent, _tp2, _tp2_percent, _message) =>
alert_array = array.new_string()
if _name != ''
array.push(alert_array, '"Name": "' + _name + '"')
if _symbol != ''
array.push(alert_array, '"Symbol": "' + _symbol + '"')
if _type != ''
array.push(alert_array, '"Type": "' + _type + '"')
if _asset_type != ''
array.push(alert_array, '"Asset Type": "' + _asset_type + '"')
if _action != ''
array.push(alert_array, '"Action": "' + _action + '"')
if _risk_value != 0
array.push(alert_array, '"Risk Value": "' + tostring(_risk_value) + '"')
if _risk_percent != 0
array.push(alert_array, '"Risk Percentage": "' + tostring(_risk_percent) + '"')
if _tp1 != 0
array.push(alert_array, '"Take Profit 1 Level": "' + tostring(_tp1) + '"')
if _tp1_percent != 0
array.push(alert_array, '"Take Profit 1 Percent": "' + tostring(_tp1_percent) + '"')
if _tp2 != 0
array.push(alert_array, '"Take Profit 2 Level": "' + tostring(_tp2) + '"')
if _tp2_percent != 0
array.push(alert_array, '"Take Profit 2 Percent": "' + tostring(_tp2_percent) + '"')
if _sl != 0
array.push(alert_array, '"Stop Loss Level": "' + tostring(_sl) + '"')
if _message != ''
array.push(alert_array, '"Message": "' + _message + '"')
alertstring = '{' + array.join(alert_array,', ') + '}'
alert(alertstring, alert.freq_once_per_bar_close)
You don't need to do anything complex though, the most important line is the alertstring = '{' + array.join(alert_array,', ') + '}'
You just need to make sure the string starts and ends with curly braces and is properly formatted JSON.
Could just as easily:
alert('{"Symbol": "' + syminfo.ticker + '", "Action": "Entry"}', alert.freq_once_per_bar_close)
You just need to be careful with your double and single quotes.
Also, this is explained if you go to set up an alert and click the option to learn more about alerts, at least the fact that formatting as JSON is what determines whether the alert is sent as text or JSON. As for the {{}}s, those are used to send a limited set of values for use with the alertcondition() function, and I don't really see an advantage to using them vs tostring() with alert().
Another thing to keep in mind is that this necessitates sending your data as strings, so you will need to make sure to convert back to ints and floats as necessary on the server side.
Following SQL statement is creating an error with message :
"Message: Fatal error encountered during command execution."
"Inner exception: Parameter '#LastUserID' must be defined."
If I directly use LAST_INSERT_ID() instead of LastUserID, it always returns zero (hence fails at second insert) when executed like this.
I don't see my syntax is different than in mySQL document.
Could some one help me ?
string Query = #"INSERT INTO login (" +
"LOGIN_EMAIL," +
"LOGIN_PASSWORD," +
"LOGIN_SALT," +
"LOGIN_LAST_LOGIN_DATE," +
// "LOGIN_LAST_LOGIN_LOCATION," +
"LOGIN_ACCOUNT_STATUS," +
"LOGIN_LOGIN_ATTEMPTS," +
"LOGIN_CREATED_DATE) " +
"VALUES (" +
"#Parameter2," +
"#Parameter3," +
"#Parameter4," +
"#Parameter5," +
// "#Parameter6," +
"#Parameter6," +
"#Parameter7," +
"#Parameter8); " +
"SET #LastUserID = LAST_INSERT_ID(); " +
"INSERT INTO user_role (" +
"USER_ROLE_USER_ID," +
"USER_ROLE_ROLE," +
"USER_ROLE_STATUS," +
"USER_ROLE_CREATED_DATE) " +
"SELECT " +
"#LastUserID," +
"#Parameter9," +
"#Parameter10," +
"#Parameter11 " +
"FROM dual WHERE NOT EXISTS (SELECT USER_ROLE_USER_ID FROM user_role " +
"WHERE USER_ROLE_USER_ID = #LastUserID AND USER_ROLE_ROLE = #Parameter9)";
MySqlCommand oCommand = new MySqlCommand(Query, oMySQLConnecion);
oCommand.Transaction = tr;
Create a procedure in which you first do your insert, cache the last inserted id, do the other insert and let it print out your parameters with a bool if your last insert worked or not. That way you can debug it properly.
In general you should avoid concatinating strings to generate sql-commands or you might get troubles with parameters containing unexpected characters or be hit by a injection.
Simple fix : Replace "$LastUserID" with "$'LastUserID'". The ephostophy makes the difference.
I have the following expression:
IsNull is column Name-- all the columns are numeric
ExpectedPremium:
([Isnull] < ExpectedMinPremium) ? ("Min" + ((DT_WSTR,10)(exp_pct_min * 100)) + "% = " + (DT_WSTR,10)ExpectedMinPremium) : ([Isnull] > ExpectedMaxPremium) ? ("Max" + ((DT_WSTR,10)(exp_pct_max * 100)) + "% = " + (DT_WSTR,10)ExpectedMaxPremium) : ""
The result of the column should look like : MAX 60% = 389727.600
I am not getting an error while creating the derived column but once I run the package I get the following message:
The "Derived Column" failed because truncation occurred, and the truncation row disposition on "Derived Column.Outputs[Derived Column Output].Columns[ExpectedPremium]" specifies failure on truncation.
A truncation error occurred on the specified object of the specified component.
It writes some rows (less than the input), I increased the destination length and it didn't work.
How to fix this expression?
I have to present my RowCount as a zero filled string. My variables are
RecordCount data type integer and StringRecordCount data type String. My Expression Task is
#[User::StringRecordCount] =
#[User::RecordCount] < 10 ? "00000" + (DT_STR,1,1252) #[User::RecordCount] :
#[User::RecordCount] < 100 ? "0000" + (DT_STR,2,1252) #[User::RecordCount] :
#[User::RecordCount] < 1000 ? "000" + (DT_STR,3,1252) #[User::RecordCount] :
#[User::RecordCount] < 10000 ? "00" + (DT_STR,4,1252) #[User::RecordCount] :
#[User::RecordCount] < 100000 ? "0" + (DT_STR,5,1252) #[User::RecordCount] :
(DT_STR,6,1252) #[User::RecordCount]
The Expression Task likes it but when I try to run the package I get the error "A truncation occurred during evaluation of the expression."
I don't know why. Can somebody help?
Thanks,
Dick
I figured out a workaround. I used the same code (with the exception of the #[User::StringRecordCount]), put it into a Derived Column and wrapped the whole thing in a (DT_STR,6,1252). Worked perfectly.
Thanks,
Dick
Below are the strings representing date of birth (yymmdd). I want to convert it into datetime format and load into a database using ssis. How can I do it? In my derived column I have (DT_DATE)(SUBSTRING([Drv DOB],1,2) + "-" + SUBSTRING([Drv DOB],3,2) + "-" + SUBSTRING([Drv DOB],5,2)), but it's not working.
I GET THESE ERRORS:
[Derived Column [2]] Error: An error occurred while attempting to perform a type cast.
[Derived Column [2]] Error: SSIS Error Code DTS_E_INDUCEDTRANSFORMFAILUREONERROR. The "Derived Column" failed because error code 0xC0049064 occurred, and the error row disposition on "Derived Column.Inputs[Derived Column Input].Columns[Drv DOB]" specifies failure on error. An error occurred on the specified object of the specified component. There may be error messages posted before this with more information about the failure.
•470324
•470324
•470209
•101
•0
YEAR have 4 digits not 2, so it would be:
(DT_DATE)("20" + SUBSTRING([Drv DOB],1,2) + "-" +
SUBSTRING([Drv DOB],3,2) + "-" +
SUBSTRING([Drv DOB],5,2))
This works for me! Thanks everyone
([Drv DOB] == "0") || ([Drv DOB] == "101") ? NULL(DT_DBTIMESTAMP) : (DT_DBTIMESTAMP)(SUBSTRING([Drv DOB],1,2) + "-" + SUBSTRING([Drv DOB],3,2) + "-" + SUBSTRING([Drv DOB],5,2))