I run a simple query to retrieve a row from a MySQL database.
I get ResultSet
and I need to retrieve a LocalDateTime object from it.
My DB table.
CREATE TABLE `some_entity` (
`id` bigint(20) NOT NULL AUTO_INCREMENT,
`title` varchar(45) NOT NULL,
`text` varchar(255) DEFAULT NULL,
`created_date_time` datetime NOT NULL,
PRIMARY KEY (`id`),
UNIQUE KEY `id_UNIQUE` (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=2 DEFAULT CHARSET=utf8;
I need to retrieve some entity by id.
String SELECT = "SELECT ID, TITLE, TEXT, CREATED_DATE_TIME FROM some_entity WHERE some_entity.id = ?";
PreparedStatement selectPreparedStatement = connection.prepareStatement(SELECT);
try {
selectPreparedStatement.setLong(1, id);
ResultSet resultSet = selectPreparedStatement.executeQuery();
if (resultSet.next()) {
Long foundId = resultSet.getLong(1);
String title = resultSet.getString(2);
String text = resultSet.getString(3);
LocalDateTime createdDateTime = null;// How do I retrieve it???
}
} catch (SQLException e) {
throw new RuntimeException("Failed to retrieve some entity by id.", e);
}
Try retrieving this as java.sql.Timestamp
and then converting to LocalDateTime
using Timestamp.toLocalDateTime
:
LocalDateTime createdDateTime = resultSet.getTimestamp(4).toLocalDateTime()
EDIT: As Gord Thompson pointed out in his comment, there's an even better solution when working with a recent enough JDBC driver:
resultSet.getObject(4, LocalDateTime.class)
This skips creating a redundant java.sql.Timestamp
instance.
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