CODEWITHSUNDEEP
spring-boothibernatespring-data-jpadb2dialect
chetan agrawal
chetan agrawal

Reputation: 107

When i am using it with db2 for pagination, my next page is giving error

I am using spring data JPA with DB2. My first set of record is coming (i.e., index 0). But when I do the next, it is giving me an error. I guess it may be because of DB2. When I use index 0 it is working fine. But when I use index 1 then it is giving DataAccessException.

Pageable pageable = new PageRequest(1, 10, Direction.ASC, "messageId");

The error occurs when using PageRequest with an index > 0. This leads to the below error

com.ibm.db2.jcc.am.SqlSyntaxErrorException: DB2 SQL Error: SQLCODE=-199, SQLSTATE=42601, SQLERRMC=OF;??( [ DESC ASC NULLS RANGE CONCAT || / MICROSECONDS MICROSECOND, DRIVER=3.69.24

Upvotes: 6

Views: 3102

Answers (2)

SnoopDougg
SnoopDougg

Reputation: 1609

Following Abdul Gaffar Khan's advice worked for me. Here's what I had to change:

Added my exteded DB2 Dialect to my application.properties file:

spring.jpa.properties.hibernate.dialect=com.my.package.to.MyDB2Dialect
spring.jpa.database=db2

Extended the DB2Dialect:

import org.hibernate.dialect.DB2Dialect;
import org.hibernate.dialect.pagination.AbstractLimitHandler;
import org.hibernate.dialect.pagination.LimitHandler;
import org.hibernate.dialect.pagination.LimitHelper;
import org.hibernate.engine.spi.RowSelection;

public class MyDB2Dialect extends DB2Dialect {

    private static final AbstractLimitHandler MY_LIMIT_HANDLER = new AbstractLimitHandler() {
        @Override
        public String processSql(String sql, RowSelection selection) {
            if (LimitHelper.hasFirstRow( selection )) {
                //nest the main query in an outer select
                return "select * from ( select inner2_.*, rownumber() over() as rownumber_ from ( "
                        + sql + " fetch first " + getMaxOrLimit( selection ) + " rows only ) as inner2_ ) as inner1_ where rownumber_ > "
                        + selection.getFirstRow() + " order by rownumber_";
            }
            return sql + " fetch first " + getMaxOrLimit( selection ) +  " rows only";
        }

        @Override
        public boolean supportsLimit() {
            return true;
        }

        @Override
        public boolean useMaxForLimit() {
            return true;
        }

        @Override
        public boolean supportsVariableLimit() {
            return false;
        }
    };

    @Override
    public boolean supportsSequences() {
        return false;
    }

    @Override
    public LimitHandler getLimitHandler() {
        return MY_LIMIT_HANDLER;
    }
}

Upvotes: 12

Abdul Gaffar Khan
Abdul Gaffar Khan

Reputation: 244

Actually org.hibernate.dialect.DB2Dialect class generates invalid query that why its failing you have to correct query by overiding its method.

replace over( order by order of inner2_)  with over()

Upvotes: 3

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