Develop Reference

Check if java Timestamp is null in jpql query

I have the following code:
#Query("select t from Training t join t.skills s join t.trainers tr join t.discipline d where " +
"(t.name in :names or :names is null) and (s.name in :skills or :skills is null) and" +
" (t.location = :location or :location is null) and " +
" (d.name = :discipline or :discipline is null) and " +
"(tr.firstName in :trainers or :trainers is null) and " +
" (((:endDate > t.endDate) and (:startDate < t.startDate)) or (:startDate is empty))")
public List<Training> filterTrainings(List<String> names, List<String> skills, String location,String discipline,List<String> trainers,Timestamp endDate,Timestamp startDate);
and i need to check if :startDate and :endDate are null. Is there a way to do that?
The error i get is nested exception is org.hibernate.exception.SQLGrammarException: could not extract ResultSet
when trying to check :startDate is null where start date is a Timestamp.

Could you try passing a LocalDateTime as a parameter instead of a Timestamp? java.sql.Timestamp might be causing you issues here. You can convert to a LocalDateTime by calling timestamp.toLocalDateTime()
Alternatively you could try passing the timestamp as a string into filterTrainings. If the timestamp is null before calling the filterTrainings method, assign an empty string. String _timestamp = timestamp == null ? "" : timestamp.toString()
Then, in your sql statement check if the string is empty .. ""=:timestamp OR function("to_timestamp", :timestamp, "yyyy-mm-dd hh:mm:ss.fffffffff"). The problem here is that we are using function to access native db commands.

Maybe you can build your SQL query with a and COALESCE(field, default_value_for_datetime_field). So you will not get NULL values.
You can build a default value as the start of the current month, of the current week, or any datetime value which could be a fair substitution for your model domain.

How to use cast in HQL OR JPQL?

Hi,my HQL query is like this.
#Query("select A.TheaterName as theater,A.MovieName as movie,CAST(A.ShowDateTime as showDate)" +
"(select sum(TicketPrice) from ccmsfdb2.HallApi.TicketTransaction where \n" +
"CAST(ShowDateTime as date)=CAST(A.ShowDateTime as Date) AND\n" +
" MovieName=A.MovieName and TheaterName=A.TheaterName and TicketStatusValue=1) as collection\n" +
"from CCMSFDB2.HallApi.TicketTransaction A where A.MovieName='Sanju' \n" +
"and A.TheaterName='QFX Jai Nepal' \n" +
"group by CAST(A.ShowDateTime as date),A.TheaterName,A.MovieName,CAST(A.ShowDateTime as Date) order by showDate DESC")
List<MovieCollectionAccordingToTheaaterDto> getMovieCollectionAccordingToTheater();\
In the above query ,I have tried to cast showdatetime as date and sum the gross collection according to date but cast is not supported in hql and i don't want to use native query.

CAST is supported in HQL, given that the underlying DB supports it.
Try full-qualified class name for Date(java.util.Date) inside the #Query expression.
See :
1. HQL Expressions

Pass a date as an argument

I did a SQL query in Java as follows:
"SELECT A.ID_MACHINE, A.HEURODATAGE, A.COMPTEUR, B.LIBELLE_IDMACHINE, C.LIBELLE_STATUT, C.CODE_COULEUR FROM ROXJAVA.MACH0004 A " +
"JOIN ROXJAVA.MACH0003 B ON A.ID_MACHINE = B.ID_MACHINE " +
"JOIN ROXJAVA.MACH0002 C ON B.CODE_MACHINE = C.CODE_MACHINE " +
"WHERE A.ID_MACHINE = ? AND A.HEURODATAGE BETWEEN '?' AND '?' AND A.CODE_STATUT = C.CODE_STATUT AND C.CODE_COULEUR = ? " +
"ORDER BY A.HEURODATAGE DESC";
In my WHERE it finds "Heurodatage" which must contain a time and a date with this format:
'2018-07-03 09:30:00.000'
I then want to retrieve the results of this query with the help of a method that takes into account the different attributes that I need to replace the? in my request.
But now I can not determine the type of my dates.
I'm getting "type not match" when I try to run with a String.

If the column is a date column, you want to pass in a date type:
PreparedStatement ps = ...;
ps.setDate(N, java.sql.Date.valueOf(your_date_value));
where it would be best if your_date_value is a java.time.LocalDate, but could also be parsed from a String (in a valid format).

sql query not matching the string literal stored in variable

I am facing a problem while executing this sql query. The variable combo_sel doesn't seem to be replaced in the sql query.
Could you help me find the error?
String combo_sel = String.valueOf(station_type.getSelectedItem());
sql="Select reporting_date as REPORTING_DATE,for_date as FOR_DATE,outage_date as OUTAGE_DATE,outage_time as OUTAGE_TIME,stat_detail as STATION_DETAILS,res_date as RESTORATION_DATE,rest_time as RESTORATION_TIME,rest_reason as RESTORATION_REASON from " + table_sel+" where for_date='" + date1 + "' and stat_detail ="+ combo_sel ;

update current date and time to db using sql from Java code

i have a table "queue_in_progress" whose structure is like the following :
I want to update the DATE_TIME_TOKEN_TAKEN , CE_PK , Service_status of the table . For this , I have the following code :
String sqlQuery = "UPDATE queue_in_progress\n" +
"SET CE_PK="+ce_pk+" ,SERVICE_STATUS=1 \n" +
"WHERE CATEGORY_PK="+Category_PK+" AND TOKEN_NO="+ Token_PK+" "
+ " AND SERVICE_COUNTER="+service_counter+" AND SERVICE_CENTER_PK="+service_center+" ;";
java.util.Date utilDate = new Date(); // Convert it to java.sql.Date
java.sql.Date date = new java.sql.Date(utilDate.getTime());
PreparedStatement stmt = con.prepareStatement(sqlQuery);
stmt.setDate(1, date);
success = stmt.executeUpdate();
But the success flag is returning -1 and the table is not updated . What is the problem ? What can I do to fix this problem ?

I don't see DATE_TIME_TOKEN_TAKEN=? in your query (the bind parameter), I think you wanted
String sqlQuery = "UPDATE queue_in_progress SET DATE_TIME_TOKEN_TAKEN=?, "
+ "CE_PK=" + ce_pk
+ ", SERVICE_STATUS=1 WHERE CATEGORY_PK="
+ Category_PK
+ " AND TOKEN_NO="
+ Token_PK
+ " AND SERVICE_COUNTER="
+ service_counter + " AND SERVICE_CENTER_PK=" + service_center;

OR if you want DATE_TIME_TOKEN_TAKEN to ALWAYS hold Current Time value, you can Set it on your Database side, no need to set it in your code.
ALTER TABLE queue_in_progress
MODIFY DATE_TIME_TOKEN_TAKEN DEFAULT CURRENT_TIMESTAMP;