在 jooq 中使用 row() 到 map 导致自定义 seekStep class

Question

Since I don't want to use RecordX class (in my case I am returning 11 fields from query) I've created custom mapper to map SelectSeekStep result into it. The problem occurs when I have fields that are part of joined table. Eg

@Value
public class CustomMapperSelectSeekStep {
  private final String field1;
  private final String field2;
  private final String field3;
  private final String field4;
  private final String field5;
  private final String field6;
  private final String field7;
  private final String test_id;
  private final String field9;
  private final String field10;
}

Let's say that all fields except test_id fields are part of main table (let's call it dummy ) and that field is part of test table which we will connect with left join .

dslContext
.select(
row(DUMMY.FIELD1,
    DUMMY.FIELD2,
    DUMMY.FIELD3,
    DUMMY.FIELD4,
    DUMMY.FIELD5,
    DUMMY.FIELD6,
    DUMMY.FIELD7,
    TEST.TEST_NAME,
    DUMMY.FIELD8,
    DUMMY.FIELD9,
    DUMMY.FIELD10).mapping(CustomMapperSelectSeekStep::new))
.from(DUMMY)
.leftJoin(TEST).on(TEST.ID.eq(DUMMY.TEST_ID))
.orderBy(DUMMY.FIELD1);

Exception I am getting:

java.lang.IllegalArgumentException: Field ("test"."test_name") is not contained in Row 
(row (
"DUMMY"."FIELD1",
"DUMMY"."FIELD2",
"DUMMY"."FIELD3",
"DUMMY"."FIELD4",
"DUMMY"."FIELD5",
"DUMMY"."FIELD6",
"DUMMY"."FIELD7",
"DUMMY"."FIELD8",
"TEST"."TEST_NAME",
"DUMMY"."FIELD9",
"DUMMY"."FIELD10"
))  

UPDATE: added entire method call:

dslContext.transaction(configuration -> {
DSLContext localDsl = DSL.using(configuration);
try (Cursor<Record1<CustomMapperSelectSeekStep>> records = 
selectRecords(localDsl)
    .fetchSize(1000)
    .resultSetType(ResultSet.TYPE_FORWARD_ONLY)
    .resultSetConcurrency(ResultSet.CONCUR_READ_ONLY)
    .fetchLazy()) {
        processRecords(records);
    }
});
//method
private SelectSeekStep1<Record1<CustomMapperSelectSeekStep>,Timestamp> selectRecords(DSLContext dslContext) {
return dslContext.select(
    row(DUMMY.FIELD1,
        DUMMY.FIELD2,
        DUMMY.FIELD3,
        DUMMY.FIELD4,
        DUMMY.FIELD5,
        DUMMY.FIELD6,
        DUMMY.FIELD7,
        TEST.TEST_NAME,
        DUMMY.FIELD8,
        DUMMY.FIELD9,
        DUMMY.FIELD10).mapping(CustomMapperSelectSeekStep::new))
    .from(DUMMY)
    .leftJoin(TEST).on(TEST.ID.eq(DUMMY.TEST_ID))
    .orderBy(DUMMY.FIELD1);
    }

Inside process record I am mapping Record objects to desired object type.

void processRecords(List<Records> records) {
record.map(recordMapper);
} 

I have custom recordMapper implementation where i am doing logic like this:

testName = record.get(TEST.TEST_NAME, Test.class);

Stack trace:

    at org.jooq.impl.Tools.indexFail(Tools.java:1769)
at org.jooq.impl.AbstractRecord.get(AbstractRecord.java:331)
at org.jooq.impl.AbstractRecord.get(AbstractRecord.java:336)
at org.test.CustomMapper.map(CustomMapper.java:42)
at org.test.CustomMapper.map(CustomMapper.java:16)
at org.jooq.impl.AbstractRecord.map(AbstractRecord.java:904)
at org.test.Processor.processRecords(Processor.java:88)
at org.test.Repository.lambda$fetchLazy$0(Repository.java:78)
at org.jooq.impl.DefaultDSLContext.lambda$transaction$5(DefaultDSLContext.java:611)
at org.jooq.impl.DefaultDSLContext.lambda$transactionResult0$3(DefaultDSLContext.java:549)

Answer 1

The problem is that you've nested your record to have a type like this

Cursor<Record1<CustomMapperSelectSeekStep>>

When you thought you had a type like this:

Cursor<Record10<T1, T2, ..., T10>>

In the latter case, you could simply extract the projected column like you did:

record.get(TEST.TEST_NAME);

But when you have a nested record, that column no longer exists, it's nested in an anonymous Record1<?> type. Not only that, but because you used an ad-hoc converter using convertFrom() , there's no nested record anymore, but jOOQ projected your custom POJO type CustomMapperSelectSeekStep for you.

So, just read your value like this:

void processRecords(List<Record1<CustomMapperSelectSeekStep>> records) {
    for (Record1<CustomMapperSelectSeekStep> record : records) {
        CustomMapperSelectSeekStep pojo : record.value1();
    }
}