Save LocalDateTime with namedParameterJdbcTemplate - spring

Question

I have a list of 4 million generated entities that I want to move into table. The entity have field with type LocalDateTime:
#Data
#AllArgsConstructor
#Entity
#Table(name = "invoices")
public class Invoice {
#Id
#GeneratedValue(strategy=GenerationType.IDENTITY)
Long id;
#Column(name = "exact_iss_time")
private LocalDateTime exactIssueTime;
#Column(name = "final_iss_time")
private LocalDateTime finalIssueTime;
#Column(name = "issuer")
private String issuer;
#Column(name = "groupid")
private Integer groupID;
protected Invoice() {
}
}
As it is a big number of entities I want to do it optimally - which I gues is with NamedParameterJdbcTemplate.batchUpdate() like this:
public int[] bulkSaveInvoices(List<Invoice> invoices){
String insertSQL = "INSERT INTO invoices VALUES (:id, :exactIssueTime, :finalIssueTime, :issuer, :groupID)";
SqlParameterSource[] sqlParams = SqlParameterSourceUtils.createBatch(invoices.toArray());
int[] insertCounts = namedParameterJdbcTemplate.batchUpdate(insertSQL, sqlParams);
return insertCounts;
}
However I keep getting error:
org.springframework.jdbc.BadSqlGrammarException: PreparedStatementCallback; bad SQL grammar [INSERT INTO invoices VALUES (?, ?, ?, ?, ?)]; nested exception is org.postgresql.util.PSQLException: Can't infer the SQL type to use for an instance of java.time.LocalDateTime. Use setObject() with an explicit Types value to specify the type to use.
Am I doing this right - if so how to fix this LocalDateTime issue in this case?
If this is the wrong way than what is the most optimal way to INSERT the 4 million generated test entities into the table with Spring-boot?
database?

Answer 1

JPA 2.1 was released before Java 8 and therefore doesn’t support the new Date and Time API.
You can try add convertor, for more check How to persist LocalDate and LocalDateTime with JPA
#Converter(autoApply = true)
public class LocalDateTimeAttributeConverter implements AttributeConverter<LocalDateTime, Timestamp> {
#Override
public Timestamp convertToDatabaseColumn(LocalDateTime locDateTime) {
return (locDateTime == null ? null : Timestamp.valueOf(locDateTime));
}
#Override
public LocalDateTime convertToEntityAttribute(Timestamp sqlTimestamp) {
return (sqlTimestamp == null ? null : sqlTimestamp.toLocalDateTime());
}
}
Or you can try not jdbc approach, but use custom JPA batch