Do you wonder if your IT business is truly profitable or if you should raise your prices? Learn how to calculate your overhead burden using our free interactive tool and use it to determine the right price for your IT services. Start calculating Now!
Petapoco - Getting return from Oracle function
I'm running into the same problem as outlined in this post:
http://stackoverflow.com/questions/35113140/executing-oracle-function-and-getting-back-a-return-value
I can do this in my Toad client successfully:
This function returns:
I don't really want to go back to the ADO way of doing these types of queries.
http://stackoverflow.com/questions/35113140/executing-oracle-function-and-getting-back-a-return-value
I can do this in my Toad client successfully:
declare result varchar2(30);
BEGIN
result:=WEBUSER.F_UpdateParticipant(json input_goes here);
dbms_output.put_line(result);
END;
This function returns:
{"Success":true}
or
{"Success":false}
var result = new Oracle.ManagedDataAccess.Client.OracleParameter("result",Oracle.ManagedDataAccess.Client.OracleDbType.Varchar2, System.Data.ParameterDirection.Output);
var sql = "DECLARE result VARCHAR2(30);" +
"BEGIN "+
" @0:=WEBUSER.F_UpdateParticipant(@1);" +
"END;";
_db.db.Execute(sql, result, json);
res = result.ToString();
var result = new Oracle.ManagedDataAccess.Client.OracleParameter("result",Oracle.ManagedDataAccess.Client.OracleDbType.Varchar2, System.Data.ParameterDirection.Output);
var sql = "DECLARE result VARCHAR2(30);" +
"BEGIN "+
" @result:=WEBUSER.F_UpdateParticipant(@1);" +
"END;";
_db.db.Execute(sql, result, json);
res = result.ToString();
I don't really want to go back to the ADO way of doing these types of queries.
Do more with
EXPERT OFFICE® is a registered trademark of EXPERTS EXCHANGE®
I think you can make your life much simpler ...
and don't use the parameter stuff, but a plain "ExecuteScalar" method in "db", though I don't know what "_db" and "_db.db" objects are ...
select WEBUSER.F_UpdateParticipant(@1) from dual;
and don't use the parameter stuff, but a plain "ExecuteScalar" method in "db", though I don't know what "_db" and "_db.db" objects are ...
object res = _db.db.ExecuteScalar(sql, json);
Guy,
The @0 is the first parameter in the parameters list in the function call, which is json, If I use @1, I get this error: Specified argument was out of the range of valid values.
I have already tried this this way too, but I MUST get the return value from the function call.
Doing it like above (with @0) returns this error: ORA-00911: invalid character
_db.db is the PetaPoco Db connector.
Do you have any other suggestions?
The @0 is the first parameter in the parameters list in the function call, which is json, If I use @1, I get this error: Specified argument was out of the range of valid values.
I have already tried this this way too, but I MUST get the return value from the function call.
Doing it like above (with @0) returns this error: ORA-00911: invalid character
_db.db is the PetaPoco Db connector.
Do you have any other suggestions?
Ok, I've been able to get it to successfully update the record, however, I cannot get the return value at all.
But res is null because I cannot return anything from the "procedure", I get this if I try:
ORA-06550: line 1, column 33:
PLS-00372: In a procedure, RETURN statement cannot contain an expression
ORA-06550: line 1, column 33:
PL/SQL: Statement ignored
string sql = "DECLARE res VARCHAR2(30); BEGIN return WEBUSER.F_UpdateParticipant(@0); END;";
object res = _db.db.ExecuteScalar<string>(sql, json);
But res is null because I cannot return anything from the "procedure", I get this if I try:
ORA-06550: line 1, column 33:
PLS-00372: In a procedure, RETURN statement cannot contain an expression
ORA-06550: line 1, column 33:
PL/SQL: Statement ignored
this should do:
string sql = "select WEBUSER.F_UpdateParticipant(@0) FROM DUAL";
string res = _db.db.ExecuteScalar<string>(sql, json);
Not exactly... Besides an Update, there is also an insert in the function so we get the cannot perform a DML operation inside a query exception.
sure you can, using this inside the procedure
https://docs.oracle.com/cd/B19306_01/appdev.102/b14261/autonotransaction_pragma.htm
https://docs.oracle.com/cd/B19306_01/appdev.102/b14261/autonotransaction_pragma.htm
Ok, after adding that to the function, I'm getting this:
ORA-06519: active autonomous transaction detected and rolled back
ORA-06512: at "WEBUSER.F_UPDATEPARTICIPANT", line 153
Ok, Guy, I have a solution. I thought I had tried it before from looking at my previous posts. However, when I wrote the SQL, I included the wrapped version and that is what caused the exception, the wrapped sql. If the SQL is written like below, it works, perfectly.
public string UpdateParticipant(ParticipantUpdate Participant)
{
string ret = "";
IsoDateTimeConverter dt = new IsoDateTimeConverter();
dt.DateTimeFormat = "MM-dd-yyyy"; // we must have this format for our dates
string json = JsonConvert.SerializeObject(Participant, dt);
// Creating this output parameter is the key to getting the info back.
var result = new OracleParameter
{
ParameterName = "RESULT",
Direction = System.Data.ParameterDirection.InputOutput,
Size = 100,
OracleDbType = OracleDbType.Varchar2
};
// Now, setting the SQL like this using the result as the output parameter is what does the job.
string sql = $@"DECLARE result varchar2(100); BEGIN @0 := WEBUSER.F_UpdateParticipant(@1); END;";
var res = _db.db.Execute(sql, result, json);
// Now return the value of the Output parameter!!
ret = result.Value.ToString();
return ret;
}
Premium Content
You need an Expert Office subscription to comment.Start Free Trial