I am using Jdbctemplate to retrieve a single String value from the db. Here is my method.
public String test() {
String cert=null;
String sql = "select ID_NMB_SRZ from codb_owner.TR_LTM_SLS_RTN
where id_str_rt = '999' and ID_NMB_SRZ = '60230009999999'";
cert = (String) jdbc.queryForObject(sql, String.class);
return cert;
}
In my scenario it is complete possible to NOT get a hit on my query so my question is how do I get around the following error message.
EmptyResultDataAccessException: Incorrect result size: expected 1, actual 0
It would seem to me that I should just get back a null instead of throwing an exception. How can I fix this? Thanks in advance.
This question is related to
java
spring
jdbctemplate
IMHO returning a null
is a bad solution because now you have the problem of sending and interpreting it at the (likely) front end client.
I had the same error and I solved it by simply returning a List<FooObject>
.
I used JDBCTemplate.query()
.
At the front end (Angular web client), I simply examine the list and if it is empty (of zero length), treat it as no records found.
That's not a good solution because you're relying on exceptions for control flow. In your solution it's normal to get exceptions, it's normal to have them in the log.
public String test() {
String sql = "select ID_NMB_SRZ from codb_owner.TR_LTM_SLS_RTN where id_str_rt = '999' and ID_NMB_SRZ = '60230009999999'";
List<String> certs = jdbc.queryForList(sql, String.class);
if (certs.isEmpty()) {
return null;
} else {
return certs.get(0);
}
}
For Byron, you can try this..
public String test(){
String sql = "select ID_NMB_SRZ from codb_owner.TR_LTM_SLS_RTN
where id_str_rt = '999' and ID_NMB_SRZ = '60230009999999'";
List<String> li = jdbcTemplate.queryForList(sql,String.class);
return li.get(0).toString();
}
Using Java 8 or above you can use an Optional
and Java Streams.
So you can simply use the JdbcTemplate.queryForList()
method, create a Stream and use Stream.findFirst()
which will return the first value of the Stream or an empty Optional
:
public Optional<String> test() {
String sql = "select ID_NMB_SRZ from codb_owner.TR_LTM_SLS_RTN where id_str_rt = '999' and ID_NMB_SRZ = '60230009999999'";
return jdbc.queryForList(sql, String.class)
.stream().findFirst();
}
To improve the performance of the query you can append LIMIT 1
to your query, so not more than 1 item is transferred from the database.
to make
jdbcTemplate.queryForList(sql, String.class)
work, make sure your jdbcTemplate is of type
org.springframework.jdbc.core.JdbcTemplate
Ok, I figured it out. I just wrapped it in a try catch and send back null.
public String test() {
String cert=null;
String sql = "select ID_NMB_SRZ from codb_owner.TR_LTM_SLS_RTN
where id_str_rt = '999' and ID_NMB_SRZ = '60230009999999'";
try {
Object o = (String) jdbc.queryForObject(sql, String.class);
cert = (String) o;
} catch (EmptyResultDataAccessException e) {
e.printStackTrace();
}
return cert;
}
Since returning a null when there is no data is something I want to do often when using queryForObject I have found it useful to extend JdbcTemplate and add a queryForNullableObject method similar to below.
public class JdbcTemplateExtended extends JdbcTemplate {
public JdbcTemplateExtended(DataSource datasource){
super(datasource);
}
public <T> T queryForNullableObject(String sql, RowMapper<T> rowMapper) throws DataAccessException {
List<T> results = query(sql, rowMapper);
if (results == null || results.isEmpty()) {
return null;
}
else if (results.size() > 1) {
throw new IncorrectResultSizeDataAccessException(1, results.size());
}
else{
return results.iterator().next();
}
}
public <T> T queryForNullableObject(String sql, Class<T> requiredType) throws DataAccessException {
return queryForObject(sql, getSingleColumnRowMapper(requiredType));
}
}
You can now use this in your code the same way you used queryForObject
String result = queryForNullableObject(queryString, String.class);
I would be interested to know if anyone else thinks this is a good idea?
I dealt with this before & had posted in the spring forums.
The advice we received was to use a type of SQlQuery. Here's an example of what we did when trying to get a value out of a DB that might not be there.
@Component
public class FindID extends MappingSqlQuery<Long> {
@Autowired
public void setDataSource(DataSource dataSource) {
String sql = "Select id from address where id = ?";
super.setDataSource(dataSource);
super.declareParameter(new SqlParameter(Types.VARCHAR));
super.setSql(sql);
compile();
}
@Override
protected Long mapRow(ResultSet rs, int rowNum) throws SQLException {
return rs.getLong(1);
}
In the DAO then we just call...
Long id = findID.findObject(id);
Not clear on performance, but it works and is neat.
You may also use a ResultSetExtractor
instead of a RowMapper
. Both are just as easy as one another, the only difference is you call ResultSet.next()
.
public String test() {
String sql = "select ID_NMB_SRZ from codb_owner.TR_LTM_SLS_RTN "
+ " where id_str_rt = '999' and ID_NMB_SRZ = '60230009999999'";
return jdbc.query(sql, new ResultSetExtractor<String>() {
@Override
public String extractData(ResultSet rs) throws SQLException,
DataAccessException {
return rs.next() ? rs.getString("ID_NMB_SRZ") : null;
}
});
}
The ResultSetExtractor
has the added benefit that you can handle all cases where there are more than one row or no rows returned.
UPDATE: Several years on and I have a few tricks to share. JdbcTemplate
works superbly with java 8 lambdas which the following examples are designed for but you can quite easily use a static class to achieve the same.
While the question is about simple types, these examples serve as a guide for the common case of extracting domain objects.
First off. Let's suppose that you have an account object with two properties for simplicity Account(Long id, String name)
. You would likely wish to have a RowMapper
for this domain object.
private static final RowMapper<Account> MAPPER_ACCOUNT =
(rs, i) -> new Account(rs.getLong("ID"),
rs.getString("NAME"));
You may now use this mapper directly within a method to map Account
domain objects from a query (jt
is a JdbcTemplate
instance).
public List<Account> getAccounts() {
return jt.query(SELECT_ACCOUNT, MAPPER_ACCOUNT);
}
Great, but now we want our original problem and we use my original solution reusing the RowMapper
to perform the mapping for us.
public Account getAccount(long id) {
return jt.query(
SELECT_ACCOUNT,
rs -> rs.next() ? MAPPER_ACCOUNT.mapRow(rs, 1) : null,
id);
}
Great, but this is a pattern you may and will wish to repeat. So you can create a generic factory method to create a new ResultSetExtractor
for the task.
public static <T> ResultSetExtractor singletonExtractor(
RowMapper<? extends T> mapper) {
return rs -> rs.next() ? mapper.mapRow(rs, 1) : null;
}
Creating a ResultSetExtractor
now becomes trivial.
private static final ResultSetExtractor<Account> EXTRACTOR_ACCOUNT =
singletonExtractor(MAPPER_ACCOUNT);
public Account getAccount(long id) {
return jt.query(SELECT_ACCOUNT, EXTRACTOR_ACCOUNT, id);
}
I hope this helps to show that you can now quite easily combine parts in a powerful way to make your domain simpler.
UPDATE 2: Combine with an Optional for optional values instead of null.
public static <T> ResultSetExtractor<Optional<T>> singletonOptionalExtractor(
RowMapper<? extends T> mapper) {
return rs -> rs.next() ? Optional.of(mapper.mapRow(rs, 1)) : Optional.empty();
}
Which now when used could have the following:
private static final ResultSetExtractor<Optional<Double>> EXTRACTOR_DISCOUNT =
singletonOptionalExtractor(MAPPER_DISCOUNT);
public double getDiscount(long accountId) {
return jt.query(SELECT_DISCOUNT, EXTRACTOR_DISCOUNT, accountId)
.orElse(0.0);
}
You could use a group function so that your query always returns a result. ie
MIN(ID_NMB_SRZ)
Actually, You can play with JdbcTemplate
and customize your own method as you prefer. My suggestion is to make something like this:
public String test() {
String cert = null;
String sql = "select ID_NMB_SRZ from codb_owner.TR_LTM_SLS_RTN
where id_str_rt = '999' and ID_NMB_SRZ = '60230009999999'";
ArrayList<String> certList = (ArrayList<String>) jdbc.query(
sql, new RowMapperResultSetExtractor(new UserMapper()));
cert = DataAccessUtils.singleResult(certList);
return cert;
}
It works as the original jdbc.queryForObject
, but without throw new EmptyResultDataAccessException
when size == 0
.
We can use query instead of queryForObject, major difference between query and queryForObject is that query return list of Object(based on Row mapper return type) and that list can be empty if no data is received from database while queryForObject always expect only single object be fetched from db neither null nor multiple rows and in case if result is empty then queryForObject throws EmptyResultDataAccessException, I had written one code using query that will overcome the problem of EmptyResultDataAccessException in case of null result.
---------- public UserInfo getUserInfo(String username, String password) { String sql = "SELECT firstname, lastname,address,city FROM users WHERE id=? and pass=?"; List<UserInfo> userInfoList = jdbcTemplate.query(sql, new Object[] { username, password }, new RowMapper<UserInfo>() { public UserInfo mapRow(ResultSet rs, int rowNum) throws SQLException { UserInfo user = new UserInfo(); user.setFirstName(rs.getString("firstname")); user.setLastName(rs.getString("lastname")); user.setAddress(rs.getString("address")); user.setCity(rs.getString("city")); return user; } }); if (userInfoList.isEmpty()) { return null; } else { return userInfoList.get(0); } }
In Postgres, you can make almost any single value query return a value or null by wrapping it:
SELECT (SELECT <query>) AS value
and hence avoid complexity in the caller.
I just catch this "EmptyResultDataAccessException"
public Myclass findOne(String id){
try {
Myclass m = this.jdbcTemplate.queryForObject(
"SELECT * FROM tb_t WHERE id = ?",
new Object[]{id},
new RowMapper<Myclass>() {
public Myclass mapRow(ResultSet rs, int rowNum) throws SQLException {
Myclass m = new Myclass();
m.setName(rs.getString("name"));
return m;
}
});
return m;
} catch (EmptyResultDataAccessException e) { // result.size() == 0;
return null;
}
}
then you can check:
if(m == null){
// insert operation.
}else{
// update operation.
}
Since getJdbcTemplate().queryForMap expects minimum size of one but when it returns null it shows EmptyResultDataAccesso fix dis when can use below logic
Map<String, String> loginMap =null;
try{
loginMap = getJdbcTemplate().queryForMap(sql, new Object[] {CustomerLogInInfo.getCustLogInEmail()});
}
catch(EmptyResultDataAccessException ex){
System.out.println("Exception.......");
loginMap =null;
}
if(loginMap==null || loginMap.isEmpty()){
return null;
}
else{
return loginMap;
}
You can do this way:
String cert = DataAccessUtils.singleResult(
jdbcTemplate.queryForList(
"select ID_NMB_SRZ from codb_owner.TR_LTM_SLS_RTN where ID_STR_RT = :id_str_rt and ID_NMB_SRZ = :id_nmb_srz",
new MapSqlParameterSource()
.addValue("id_str_rt", "999")
.addValue("id_nmb_srz", "60230009999999"),
String.class
)
)
DataAccessUtils.singleResult + queryForList:
Source: Stackoverflow.com